Version
1.0.00
User’s Guide
2 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Software Updates
Occasionally updates and enhancements to the NEC Display Wall Calibrator software will be made available. Visit
the NEC Display Wall Calibrator section of the NEC DISPLAY SOLUTIONS web site to check for availability, or use
the Check for updates feature in the software to automatically see if a newer version is available.
NEC DISPLAY SOLUTIONS welcomes feedback and suggestions for product improvements. Please use the
feedback from on the NEC Display Wall Calibrator section of the NEC DISPLAY SOLUTIONS web site.
Technical Support and Feedback
For technical support with the NEC Display Wall Calibrator product, please visit the NEC Display Wall Calibrator
section of the NEC DISPLAY SOLUTIONS web site and check for any Frequently Asked Questions that may help
to solve the issue. An online feedback form is available for submitting questions and feedback.
Trademarks and Copyright
Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
Apple, Macintosh, Mac and the Mac logo are trademarks of Apple Computer, Inc., registered in the U.S. and other
countries.
Copyright © 2009 NEC Display Solutions, Ltd.
The content of this manual is furnished for informational use only, is subject to change without notice, and should
not be construed as a commitment by NEC Display Solutions, Ltd. NEC Display Solutions, Ltd. assumes no
responsibility or liability for any errors or inaccuracies that may appear in this manual.
All rights reserved. Your rights of ownership are subject to the limitations and restrictions imposed by the copyright
laws as outlined below.
It is against the law to copy, reproduce or transmit, including without limitation electronic transmission over any
network, any part of the manual except as permitted by the Copyright Act of the United States, Title 17, United
States Code. Under the law, copying includes translation into another language or format.
The above is not an inclusive statement of the restrictions imposed on you under the Copyright Act.
For a complete statement of the restrictions imposed on you under the copyright laws of the United States of
America, see Title 17, United States Code.
USA and Canada: www.necdisplay.com
Europe: www.nec-display-solutions.com
Asia Pacic: www.nec-display.com/ap/contact/
Revision 090811
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 3
HARDWARE LIMITED WARRANTY (U.S.A. and Canada Only)
NEC DISPLAY SOLUTIONS warrants the NEC Display Wall Calibrator Hardware (hereinafter “Product” or “Products”)
to be free from defects in material and workmanship and, subject to the conditions set forth below, agrees to repair
or replace (at NEC DISPLAY SOLUTIONS’s sole option) any part of the enclosed unit which proves defective for a
period of three (3) years from the date of rst consumer purchase. Spare parts are warranted for ninety (90) days.
Replacement parts or unit may be new or refurbished and will meet specications of the original parts or unit.
This warranty gives you specic legal rights and you may also have other rights, which vary from state to state. This
warranty is limited to the original purchaser of the Product and is not transferable. This warranty covers only NEC
DISPLAY SOLUTIONS-supplied components. Service required as a result of third party components is not covered
under this warranty. Service required as a result of abuse or improper usage is also not covered under this warranty.
In order to be covered under this warranty, the Product must have been purchased in the U.S.A. or Canada by
the original purchaser. This warranty only covers Product distribution in the U.S.A. or Canada by NEC DISPLAY
SOLUTIONS No warranty service is provided outside of the U.S.A. or Canada. Proof of Purchase will be required
by NEC DISPLAY SOLUTIONS to substantiate date of purchase. Such proof of purchase must be an original bill of
sale or receipt containing name and address of seller, purchaser, and the serial number of the product.
NEC DISPLAY SOLUTIONS SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL,
OR OTHER TYPES OF DAMAGES RESULTING FROM THE USE OF ANY NEC DISPLAY SOLUTIONS
PRODUCT OTHER THAN THE LIABILITY STATED ABOVE. THESE WARRANTIES ARE IN LIEU OF ALL OTHER
WARRANTIES EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SOME STATES DO NOT ALLOW THE
EXCLUSION OF IMPLIED WARRANTIES OR THE LIMITATION OR EXCLUSION OF LIABILITY FOR INCIDENTAL
OR CONSEQUENTIAL DAMAGES SO THE ABOVE EXCLUSIONS OR LIMITATIONS MAY NOT APPLY TO
YOU.
This Product is warranted in accordance with the terms of this limited warranty. Consumers are cautioned that
Product performance is affected by system conguration, software, the application, customer data, and operator
control of the system, among other factors. While NEC DISPLAY SOLUTIONS Products are considered to be
compatible with many systems, specic functional implementation by the customers of the Product may vary.
Therefore, suitability of a Product for a specic purpose or application must be determined by consumer and is not
warranted by NEC DISPLAY SOLUTIONS.
Federal Communications Commission (FCC) Notice (U.S.A. Only)
WARNING: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate receiving antenna.
•
Increase the separation between the equipment and receiver.
•
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•
Consult the dealer or an experienced radio/TV technician for help.
•
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
•
This device must accept any interference received including interference that may cause undesired
•
operation.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 4
Contents
Precautions: . . . . . . . . . . . . . . . . 6
Note: . . . . . . . . . . . . . . . . . . . 6
Supported Display Monitors . . . . . . . . . . . 7
System Requirements . . . . . . . . . . . . . 7
1 Introduction to NEC Display Wall Calibrator 8
Overview . . . . . . . . . . . . . . . . . . 8
Main Features and benets . . . . . . . . . . . 9
Introduction to display monitor calibration . . . . . 10
About Calibration Targets . . . . . . . . . . . . 10
2 Calibration Overview 10
Intensity . . . . . . . . . . . . . . . . . . 11
White Point . . . . . . . . . . . . . . . . . 12
Gamma and Tone Response Curves (TRC) . . . . 12
Contrast Ratio. . . . . . . . . . . . . . . . 13
Calibration Steps . . . . . . . . . . . . . . . 13
Calibration Projects . . . . . . . . . . . . . . 14
Analog Video Inputs - Important Notice . . . . . . 14
3 Planning and Conguring a Wall Layout 15
Planning . . . . . . . . . . . . . . . . . . 15
Conguring Connections . . . . . . . . . . . . 15
Daisy-chained RS232 with one COM port . . . . . 16
Single IP LAN with daisy-chained RS232 . . . . . 18
Multi IP LAN . . . . . . . . . . . . . . . . 19
Wireless multi IP LAN with daisy-chained RS232 . . 20
Conguring a Layout with the Layout Wizard . . . . 21
Calibration Times . . . . . . . . . . . . . . . 25
Video Inputs . . . . . . . . . . . . . . . . . 25
4 Dialogs, Settings and Menus 26
Main NEC Display Wall Calibrator window . . . . . 26
Edit Calibration Target Conguration dialog . . . . 28
Custom Gamma Curve dialog . . . . . . . . . 30
Custom White Point dialog . . . . . . . . . . . 31
Preferences dialog . . . . . . . . . . . . . . 32
Preferences dialog - Calibration Sensor tab . . . . 32
Preferences dialog - Calibration tab . . . . . . . 33
Preferences dialog - Interface tab . . . . . . . . 34
Panels . . . . . . . . . . . . . . . . . . . 35
Actions panel . . . . . . . . . . . . . . . . 35
Connection panel . . . . . . . . . . . . . . 36
Calibration Target panel . . . . . . . . . . . . 36
Colorimeter panel . . . . . . . . . . . . . . 37
Test Pattern panel . . . . . . . . . . . . . . 38
Reset panel . . . . . . . . . . . . . . . . 39
Display Measurements panel . . . . . . . . . . 40
Display Settings dialog . . . . . . . . . . . . . 41
Display Settings dialog - Power tab . . . . . . . 41
5
Display Settings dialog - Clock tab . . . . . . . . 41
Display Settings dialog - Input tab . . . . . . . . 42
Display Settings dialog - Video tab. . . . . . . . 42
Display Settings dialog - Calibration tab. . . . . . 43
Display Settings dialog - Status tab . . . . . . . 43
Summary window . . . . . . . . . . . . . . 44
Menus . . . . . . . . . . . . . . . . . . . 45
File menu . . . . . . . . . . . . . . . . . 45
Edit menu . . . . . . . . . . . . . . . . . 45
View menu . . . . . . . . . . . . . . . . . 45
Help menu . . . . . . . . . . . . . . . . . 45
5 Quick Start to NEC Display Wall Calibrator 46
6 Frequently Asked Questions 48
Calibration . . . . . . . . . . . . . . . . . 48
7 Troubleshooting 49
Installation and Setup . . . . . . . . . . . . . 49
Calibration . . . . . . . . . . . . . . . . . 50
Color Sensor . . . . . . . . . . . . . . . . 51
8 Assigning an IP address 52
Glossary 54
6 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Precautions:
The LCD display monitor screen is fragile and can be easily damaged if force is applied. Even
•
slight forces applied to the screen can cause temporary color distortions that can impact the
calibration process.
Never use suction cups to attach a color sensor to the display.
•
Always use the supplied cable or sling and counterweight to gently rest the color sensor on
•
the face of the display, or hold gently and steadily against the screen surface by hand, using the
minimum possible force.
Always try and position the color sensor in the center of the screen when taking measurements or
•
calibrating.
During the display calibration procedure, highly sensitive light measurements are made on the
•
screen using the color sensor. High ambient light levels such as direct sunlight on the screen, may
affect measurements and cause an inaccurate display calibration. Changes in ambient lighting can
alter how images on the screen are perceived.
Always store the color sensor in the holder when not in use.
•
Never touch the measurement window in the color sensor.
•
Never disconnect the color sensor while the NEC Display Wall Calibrator software is running.
•
Always allow the displays to warm up for at least 30 minutes before calibrating.
•
Note:
USB extender cables - Some models of color sensors may not work properly when using a USB
•
extender cable or when connected via a USB hub device. If you experience problems with detecting color
sensor or taking measurements with the color sensor, try connecting it directly to the host PC.
This document covers both the Mac OS and Windows versions of the software. The features and
•
functions of both versions are identical unless noted otherwise. The majority of the User Interface screen
images in this document show the Windows version, however the Mac OS version is identical unless noted
otherwise.
Analog Video Inputs - When using analog video inputs on the displays it may be necessary to
•
automatically adjust the video signal levels to compensate for variations in the video signals that may cause
color shifts between displays. See the Analog Inputs - Important Notice for more information.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 7
Supported Display Monitors
NEC Display Wall Calibrator supports the following NEC display monitor models:
X461UN – 46” LCD monitor
•
X461HB – 46” LCD monitor
•
P401 – 40” LCD monitor
•
P461 – 46” LCD monitor
•
System Requirements
NEC Display Wall Calibrator has the following system requirements:
ÿ
Microsoft Windows
Operating System Microsoft Windows 2000, XP, XP x64,
Server 2003, Vista, Vista x64, Windows
7, or Windows 7 x64.
Supported Color
Sensors
GretagMacbeth Eye-One Display V1
•
X-Rite/GretagMacbeth Eye-One Display V2
•
Mac OS 10.4 and higher.
Mac OS
X-Rite/GretagMacbeth Eye-One Monitor, Eye-One Pro.
•
X-Rite ColorMunki.
•
Monaco OptixXR (X-Rite DTP 94).
•
ColorVision/Datacolor Spyder 2.
•
Datacolor Spyder 3.
•
USB At least one available USB port for Color Sensor.
An active USB extender cable of up to 5M (16 feet) in length can be used if necessary with
some models of color sensors. USB extender cables should not be used with the X-Rite/
GretagMacbeth Eye-One Monitor, Eye-One Pro or X-Rite ColorMunki sensors.
LAN Standard TCP/IP LAN interface (optional
if using RS232 or Wireless LAN)
RS232 One or more RS232 COM Ports (optional
if using LAN).
Null modem cables to connect devices.
A USB to RS232 adapter can be used if
necessary.
Included on all Macs
A USB to RS232 adapter can be used if
connecting the Mac to displays via RS232
instead of via LAN.
Null modem cables to connect devices.
8 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Introduction to NEC Display Wall Calibrator
1
Overview
The aim of the NEC Display Wall Calibrator system is to automatically adjust multiple displays used in a video wall
so that the color characteristics closely match, thereby creating the visual illusion of a single large display.
In order to accomplish this, the color characteristics of each display must be individually measured and compared
to all of the other displays in the video wall. The optimal settings for each display can then be calculated so that all
the displays will match after calibration.
Since each display will vary in both color and intensity (brightness), due to aging, individual components and
tolerances, it is necessary to nd the lowest common denominator that all of the displays are capable of collectively
achieving. In other words, the video wall can only be as bright as the dimmest individual display.
The color characteristics of each display are measured using a color sensor, which is connected via USB to a host
PC. The sensor is placed on the screen and a series of test patterns is generated and measured. This process is
repeated for all displays.
The host PC does not have to supply any type of video signal to the displays in the video wall, as test patterns are
automatically generated within in each display. Communications with each display from the host PC are performed
via either RS232 or LAN (Ethernet).
Once all of the displays have been measured, the calibration Target can be calculated. This Target denes the
various calibration parameters such as the white point (color of pure white on the screen), intensity (brightness),
gamma, etc.
Each display is then calibrated to this Target setting by placing the color sensor on the screen while the software
adjusts the internal controls of the display. This process is repeated for all displays.
When the calibration process is completed, all of the displays will match. The numerical results of the calibration
process can be viewed, and also the conguration settings for each display and the entire project can be saved for
future reference and use.
Once the connections to each display have been made and congured, the measurement and calibration process
typically takes between 3 to 6 minutes per display.
The time until the displays need to be re-calibrated will depend on many factors such as the environment and
duration they are used, the age of the displays, the calibration Target settings used, and how critical the color
matching requirements are. Newer displays will tend to drift more rapidly than displays that have been in use for
several days or weeks.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 9
Main Features and benets
NEC Display Wall Calibrator provides the following features and benets:
Automatic calibration - NEC Display Wall Calibrator communicates with the display monitors directly
•
using either RS232 or a LAN (Ethernet) connection. All adjustments to the display settings are performed
automatically using this communications link. It is not necessary to manually congure the displays as all of
the necessary settings are made by the software.
Internal Test Patterns - Displays are calibrated using internally generated test patterns. This simplies
•
the operation by allowing calibration to be performed automatically without having to manually select different
test patterns during the calibration process, and without the need to connect a PC to the video input of the
displays.
10 bit internal Look Up Tables (LUTs) - Each LCD display monitor supported by NEC Display Wall
•
Calibrator features three internal 10 bit LUTs. These tables allow very precise adjustments to be made to
the display’s Tone Response Curve without reducing the number of displayable colors or introducing color
banding artifacts.
Gamma Correction - As well as adjusting the Intensity (luminance) and white point of the displays, the
•
software will also calibrate the grayscale using the internal LUTs of the displays. This means that highly
accurate color can be achieved not only at 100% white, but at all steps along the grayscale. A variety of
different Tone Response Curves can be applied also, from something as simple as a small simple gamma
value to complex custom curves.
Flexible Connections - Displays can be connected using RS232, LAN, or in combinations of both, to the
•
host PC used to perform the calibration. By using a wireless equipped host PC and LAN, displays can be
calibrated without making any physical connections to the host PC.
Projects - All display congurations, measurements, and calibration data can be saved as a project le
•
for later reference, re-calibration etc.
Multiple Calibration Sets - Different display monitor calibration projects can be uploaded to each group
•
of displays allowing quick and easy switching between different calibration settings without the need to recalibrate each display.
Informative - A Summary window shows the results of the calibration and the measurement data. This
•
allows for detailed logging and reporting of the calibration procedure.
Flexible - NEC Display Wall Calibrator provides many features and options that make it exible enough to
•
be used in a large variety of video applications, including “on set” use in TV studios and full DICOM support
for medical imaging.
Colorimeter function - The software features a Colorimeter function which allows direct measurements
•
to be taken by the color sensor and the results displayed in a variety of different formats.
Scalable - Video wall sizes from a 1x1 single display, to a 10x10 are supported.
•
10 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Calibration Overview
2
Introduction to display monitor calibration
The screen image on color LCD displays is created by emitting white light from a backlight source such as cold
cathode uorescent lamps (CCFLs) and then passing it through individual sub-pixels with red, green and blue lters
which form each pixel on the screen. The amount of light that is allowed to pass through each pixel is controlled to
form an image on the screen. The color of each pixel is controlled by varying the ratios of light passing through each
of the red, green and blue sub-pixels.
The overall brightness or Intensity of the screen is controlled by adjusting the brightness of the uorescent lamp
backlight, however the adjustment range of the backlight is limited. If it is necessary to adjust the Intensity below the
level achieved by adjusting the uorescent lamp backlight alone, further adjustments can be made using the internal
LUTs (look up tables) in the display which control the light that passes through each individual pixel.
Likewise, White Point adjustments to the display are made using the internal LUTs to reduce the brightness of one
or more colors (red, green, or blue).
Before calibrating, the desired color characteristics of the calibrated video wall must be selected. In NEC Display
Wall Calibrator these characteristics are called Calibration Targets. The software adjusts the monitors to the color
characteristics in the selected Target.
When calibrating a video wall, careful consideration should be made as to how the displays will be calibrated so that
they match as necessary. The video content shown on the displays, and how it will be divided on individual displays
will determine some of the calibration settings.
For example, when using a video wall consisting of several displays that will be displaying video tiled across all of the
displays simultaneously, it is essential that all of the displays match in both White Point and Intensity (brightness).
However, if for example, the displays each show separate video on their screen, then the Intensity matching between
the displays may not be as important as having each display be as bright as possible. Having the displays match in
White Point only may be sufcient.
The NEC Display Wall Calibrator system provides the exibility for meeting different scenarios such as these.
When calibrating a video wall to match in both White Point (color) and Intensity (brightness), the Target Intensity
can only be as high as the dimmest display. This is why it is necessary to rst measure all of the displays in their
native or uncorrected state to nd out the native White Point and Intensity values for each display. From these
measurements, the lowest common Intensity value for the chosen White Point can be calculated by the software.
About Calibration Targets
A Calibration Target consists of up to four specications that describe the color characteristics of the display:
Intensity
•
White Point
•
Gamma or Tone Response Curve (TRC)
•
Contrast Ratio
•
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 11
Display 1 Display 2
Display 4Display 3
Display 1 Display 2
Display 4Display 3
Before Calibration After Calibration
Maximum Possible Matching Intensity Adjustment
Display 1 Display 2
Display 4Display 3
Display 1 Display 2
Display 4Display 3
Before Calibration After Calibration
Maximum Possible Per Display Intensity Adjustment
Intensity
Intensity species the luminance or “brightness” of white when displayed on the screen. The maximum Intensity
value of a display will depend on many factors, such as, the color temperature of the White Point selected, the type
of monitor, individual component tolerances, usage, and age of the display.
Intensity can be measured and specied in units of either Candelas (cd/m²) or Foot Lamberts (fL) within the
application.
The NEC Display Wall Calibrator system supports 3 different methods of Intensity adjustment:
Maximum Possible Matching - Calibrates all of the displays to the maximum possible luminance that
•
can achieve a match in both Intensity and White Point. Use this option if it is desired that all of the displays
match in both color and brightness. All of the displays will only be as bright as the dimmest display.
Maximum Possible Per Display - Calibrates all of the displays to the maximum possible luminance that
•
each individual display can achieve, while matching up the white points on each display. Use this option if it
is desired that all of the displays match in color, but is not important if they match each other in luminance.
Specic Level - Calibrates all of the displays to a specied target value of luminance, while matching the
•
white points on all displays. If a display can not achieve the specied value, it will be calibrated to the closest
possible Intensity, and a warning icon will be displayed after the calibration process is completed. Use this
option if the particular application requires a specic luminance, but keep in mind that each display must
actually be capable of achieving that value.
The difference between Maximum Possible Matching and Maximum Possible Per Display Intensity adjustment
types is illustrated below:
12 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
The choice of Intensity adjustment method will depend on the particular application and viewing environment.
If the displays are being used in a bright environment, then the Intensity would generally need to be the maximum
possible. So either Maximum Possible Matching or Maximum Possible Per Display would be used.
White Point
The White Point species the color of pure “white” on a display. Since there is no unique perceptual or physical
denition of what “white” is, it must be dened in terms of a standard or device-independent color space to be
measured and reproduced.
There are several methods of specifying a white point, including using a blackbody radiator color temperature or
as a point in a device-independent color space. NEC Display Wall Calibrator allows the white point to be specied
either as a black body radiator color temperature in Kelvin, as a CIE standard illuminant, or as CIE xy chromaticity
coordinates.
A White Point expressed as a blackbody radiator color temperature in Kelvin represents the light given off by an
object, known as a blackbody, as it is heated to a given temperature. Low color temperatures, such as 2500K, are
reddish, while higher color temperatures, such as 9300K, are bluish. A color temperature of 6500K is considered to
be “neutral” white.
A CIE Standard Illuminant is a dened white color based on a known light source. In NEC Display Wall Calibrator
the D or Daylight Illuminant series can be used to specify a white point. Daylight Illuminants are named according
to their corresponding correlated color temperature. For example, D50 is very close in color to a 5000K blackbody
radiator.
Since adjusting the White Point away from the native value of the display involves reducing the level of at least one
color (red, green, or blue), the brightest possible display will be when least amount of correction is made. Choosing
a White Point that is very different from the native White Point will mean that a large correction must be applied, and
the maximum brightness will be impacted.
If the application the video wall is being used for does not need a specic White Point, and the brightest possible
display is required, a White Point that will achieve the highest possible overall Intensity after calibrating can be
automatically calculated. This calculation factors in the native Intensity and White Points of each display in order to
determine the resulting White Point. This function is available in the White Point group in the Edit Calibration Target
dialog.
Gamma and Tone Response Curves (TRC)
The Gamma or Tone Response Curve of a display is the relationship between the video input signal level and the
light output (“brightness”) displayed on the monitor. The display monitor is a nonlinear display device. In simple
terms, this means that doubling the level of the video input signal to the display does not double the light output. For
CRT based displays, the light output follows a mathematical power function of the input video signal. This power
function has an exponent called gamma, which is commonly used to describe the relationship between the video
input signal and light output of the screen.
A gamma value of 1 would result in a perfectly linear display (doubling the signal level doubles the light output)
and the Tone Response Curves would be straight lines. The particular Tone Response Curves of a display will
change with the display color settings and may vary from one display to the next. If accurate color matching is to be
performed, the display’s Tone Response Curves must be accurately measured and compensated for. NEC Display
Wall Calibrator uses the color sensor to automatically measure the Tone Response Curves of the display.
Normally, a standard Gamma value is required when working with images. For example, the sRGB standard color
space target species a display Gamma value of 2.2. Since the Gamma value of the display may be different than
the required Gamma value, a correction needs to be applied so that the apparent display Gamma matches that of
the required Target. In NEC Display Wall Calibrator, this correction is applied to the LUTs (Look Up Tables) inside
the monitor. The software also uses the monitor’s LUTs for Targets that have Tone Response Curves which do not
follow a normal Gamma curve. An example is DICOM, which uses a curve that changes shape based on how bright
the display is.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 13
Calibrating the gamma or Tone Response Curve of the display during calibration will automatically correct for
any color deviations in shades of gray between black and white. This provides the best possible grayscale color
tracking.
Contrast Ratio
The Contrast Ratio of the display is the ratio of the measured Intensity to the measured Black Level. The Black
Level is the luminance or “brightness” of black when displayed on the screen. For LCD monitors the minimum or
native Black Level is typically xed in ratio to the Intensity value due to the display technology.
NEC Display Wall Calibrator allows the Contrast Ratio to be selected for applications that require a specic contrast
ratio. However the calibrated contrast ratio can not be higher than the native contrast ratio, since the minimum Black
Level that the display can achieve is limited by the display technology.
The Contrast Ratio is adjusted (reduced) by increasing the black level as necessary.
For most applications the highest possible Contrast Ratio is most suitable and can be achieved by selecting Monitor
Default as the Contrast Ratio.
Specic Contrast Ratios in the range 50:1 to 500:1 can be selected.
Note: If the selected contrast ratio is higher than what the display is actually capable of achieving, then the display
will calibrate to the highest possible contrast ratio. For example if 500:1 is selected, but the display is only capable
of say 320:1 with the current Target settings, then the resulting calibration will have a contrast ratio of 320:1.
Calibration Steps
The display calibration process for a video wall when matching both the Intensity and White Point is outlined in the
following steps:
Initialize Displays - This step resets each display to the default color settings so that the “native” performance
1.
of each display can be measured before the calibration. Settings such as the Brightness, Color mode, Contrast etc. will be reset.
Measuring Displays - During this step, all displays are measured to determine the default “native” color char-
2.
acteristics of each display. This step involves placing the color sensor on the screen while various test patterns
are displayed and measured. This step repeated for all displays in the video wall.
Target Calculation - Once all of the displays have been measured the software will automatically calculate
3.
the maximum possible Intensity that will give a color match with all the displays. This is done by determining
the dimmest display in the video wall at the chosen White Point.
Calibrating Displays - Once the Target has been calculated, all of the displays can be calibrated. This step
4.
involves placing the color sensor on the screen while various test patterns are displayed and the display is
adjusted. This step repeated for all displays in the video wall.
Note: When calibrating to a Target that uses either Maximum Possible Per Display or Specic Level option for
the Intensity, steps 1 and 2 are optional because it is not necessary to measure and calculate the matching Target
value.
However if Specic Level is used, performing steps 1 and 2 will allow the software to verify that each display is
capable of achieving the specied Intensity value at the selected White Point. If a display can not achieve this, then
a yellow warning icon is shown in both the Summary window, and in the main display window for that particular
display.
14 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Calibration Projects
The NEC Display Wall Calibrator application uses Project les to store the following information and settings:
Layouts including all of the connection settings and video wall size information.
•
Measurements for each display, including the time each measurement was taken.
•
Calibration results for each display, including the nal color characteristics of each display and when it
•
was calibrated.
Calibrated Monitor Settings for each display so that settings can be restored to one or all displays if
•
necessary.
All of the display measurements and settings are unique to each display and are identied within the software by
the model and serial number of each display.
Project les can be saved at any point. By saving Projects using different le names, different congurations for the
same video wall can be stored and later restored to the displays if necessary.
Project les can also be used to keep track of when a video wall was last calibrated.
Analog Video Inputs - Important Notice
The display calibration process adjusts the digital portion of the video processing within the display. For analog
video signals such as VGA, RGB/HV, and Option-Analog, the signal is digitized within the display using an Analog-
to-Digital converter. Due to variances in analog video signal levels and offsets from the video source device, it may
be necessary to also adjust the settings for the video Analog-to-Digital conversion.
If the screens on the video wall do not match well in color after calibration, use the Test Pattern tool with the
Calibrated White setting to evaluate the displays using their internally generated test patterns. If the Test Patterns
match well, then it indicates that the analog video signal levels need to be adjusted. Use the Display Settings
dialog - Video tab to perform an automatic adjustment of the video levels.
Note: This adjustment process requires specic patterns to be displayed on the video signal in order for the display
to automatically adjust the video signal levels correctly. Failure to display the correct signal may result in the video
levels being incorrectly set and the displays may not match in color when using an analog video source.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 15
Planning and Conguring a Wall Layout
3
Planning
In order for the software to uniquely identify and communicate with each display, the software must be correctly
congured with the following settings:
The number of rows and columns of displays in the video wall.
•
The communications interface type for each display (RS232 or LAN).
•
The connection RS232 COM Port or IP address of each display.
•
The MONITOR ID of each display.
•
The order in which displays should be measured and calibrated.
•
For large video walls where it is necessary to use a ladder or platform to access the screen of each display, careful
consideration should be made of the layout order in order to minimize physical movement and in turn maximize the
efciency and speed of the calibration process.
For example, if using a ladder, it may be easier to calibrate a vertical column of displays, and then move the ladder
across to the next column. Similarly if using a horizontal platform, it may be easier to calibrate a horizontal row of
displays, and then move the platform up or down to the next row.
For very large video walls, for example larger than a 5x5, it may be more efcient to split the calibration into two
separate projects and divide the wall into two. However keep in mind that depending on the calibration Target type
being used, it may be necessary to measure all of the displays in the video wall in order to determine the dimmest
display.
The physical wiring connection order between displays does not dictate the order in which the displays are measured
and calibrated, since MONITOR IDs and IP addresses can be congured for each display.
Conguring Connections
Displays can be connected to the host PC via either RS232 or LAN, in several different congurations. A wireless
LAN connection can also be used from the host PC if using a wireless access point or router.
Keep in mind the following points when conguring and connecting displays:
If using RS232 to connect displays using a daisy-chain, each display on the chain must have a unique
•
Monitor ID (set on the display’s OSD).
If using RS232, displays should be connected using an RS232 serial NULL modem cable.
•
The RS232 connection from the host PC should connect to the RS232 IN on the rst display.
•
The RS232 OUT of a display should connect to the RS232 IN on the next display in the daisy-chain.
•
If using LAN to connect to one or more displays, make sure that the IP address of each display is set
•
correctly and that each display has a unique IP address (set using a web browser). Also make sure that the
displays are on the same subnet as the host PC being used.
Examples of various connection congurations are shown on the following pages.
16 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
RS232 IN
RS232 OUT
RS232 IN
RS232 OUT
RS232 IN
RS232 OUT
RS232 IN
ID 1
RS232
Display 1
ID 2
RS232
Display 2
ID 3
RS232
Display 3
ID 4
RS232
Display 4
PC
COM1
Daisy-chained RS232 with one COM port
In this example, the host PC has one RS232 COM port, and all displays are daisy-chained together. Each display
must have a unique MONITOR ID since they are all on the same daisy-chain. The RS232 OUT on the rst display
is connected to the RS232 IN on the next, etc.
Note: The cable connections between displays does not need to follow the same ordering as the ID assignments.
In this example the daisy-chain is connected in order 1 - 2 - 4 - 3.
The following image shows how this layout looks in the Summary window when congured. Notice that all displays
are congured to use the same COM port, even though only the rst display is actually connected to the host PC.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 17
RS232 IN
RS232 OUT
RS232 IN
RS232 OUT
RS232 IN
RS232 IN
ID 1
RS232
Display 1
ID 2
RS232
Display 2
ID 1
RS232
Display 3
ID 2
RS232
Display 4
PC
COM1
COM2
Daisy-chained RS232 with multiple COM ports
In this example, the host PC has two RS232 COM ports, and there are two separate daisy-chains. Each display on
a daisy-chain must have a unique MONITOR ID.
The following image shows how this layout looks in the Summary window when congured. Notice that displays
connected on COM1 can have the same IDs as those on COM2 because they are on separate daisy-chains.
18 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
LAN
RS232 OUT
RS232 IN
RS232 OUT
RS232 IN
RS232 OUT
RS232 IN
ID 1
LAN
IP 192.168.0.1
Display 1
ID 2
RS232
Display 2
ID 3
RS232
Display 3
ID 4
RS232
Display 4
PC
IP 192.168.0.255
LAN
Single IP LAN with daisy-chained RS232
In this example, the host PC is connected to the rst display via LAN. Subsequent displays are connected together
using RS232 daisy-chaining. Each display on a daisy-chain must have a unique MONITOR ID.
The rst display is congured to use LAN as the EXTERNAL CONTROL on the OSD. The other displays are
congured to use RS232 as the EXTERNAL CONTROL on the OSD. The RS232 OUT on the rst display is
connected to the RS232 IN on the next display.
Since communications to all of the displays is routed through the rst display, the software is congured to use the
IP address of the rst display for each display. The rst display will translate commands via LAN to the RS232 OUT
to be received by the other displays in the video wall.
The following image shows how this layout looks in the Summary window when congured. Notice that all of the
displays are congured in the software to use the LAN IP address 192.168.0.1, even though displays 2, 3, and 4
are connected together via RS232.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 19
LAN
LAN
LAN
LAN
LAN
ID 1
LAN
IP 192.168.0.1
Display 1
ID 1
LAN
IP 192.168.0.2
Display 2
ID 1
LAN
IP 192.168.0.3
Display 3
ID 1
LAN
IP 192.168.0.4
Display 4
PC
IP 192.168.0.255
LAN HUB
Multi IP LAN
In this example, the host PC and each display is connected via a LAN HUB. Each display has a unique IP address
and is congured to use LAN as the EXTERNAL CONTROL on the OSD.
The software is congured with the IP address and MONITOR ID of each display.
The ID of each display does not need to be unique since the displays are not daisy-chained, however the ID set on
the OSD must match that set in the software.
The following image shows how this layout looks in the Summary window when congured.
20 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
RS232 OUT
RS232 OUT
RS232 IN
RS232 IN
LAN
LAN
ID 1
LAN
IP 192.168.0.1
Display 1
ID 2
RS232
Display 2
ID 2
RS232
Display 4
WIRELESS
LAN ROUTER
PC
IP 192.168.0.255
ID 1
LAN
IP 192.168.0.2
Display 3
Wireless multi IP LAN with daisy-chained RS232
In this example, the host PC is connected to a LAN via a wireless connection. Display 1 and Display 3 are connected
to the LAN, have unique IP addresses, and are congured to use the LAN on the EXTERNAL CONTROL setting
on the OSD.
Other displays are daisy-chained from the two displays connected to the LAN. Each display on a daisy-chain has a
unique ID assigned, and is congured to use RS232 on the EXTERNAL CONTROL setting on the OSD.
Since communications to Display 2 is routed through Display 1, the software is congured to so that Display 2 uses
the IP address of Display 1, even though Display 2 is congured to use RS232 on the OSD. Likewise the software
is congured so that Display 4 uses the IP address of Display 3.
The following image shows how this layout looks in the Summary window when congured. Notice that Display 2
is congured in the software to use the LAN IP address 192.168.0.1 of Display 1, even though it is connected to
Display 1 via RS232. Likewise Display 4 is congured in the software to use the LAN IP address 192.168.0.2 of
Display 3, even though it is connected to Display 3 via RS232.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 21
Conguring a Layout with the Layout Wizard
The Layout Wizard is accessed from the Edit menu and will guide you through the initial layout conguration for the
video wall. After the wizard is completed, changes to the conguration settings for individual displays can be made
if necessary using the Connection panel.
In the following conguration example, a 3x2 video wall that uses a LAN connection for communications to the rst
display, and daisy chained RS232 from that display to the remaining 5 displays.
The number of rows and columns is entered. In this example there are 3 columns and 2 rows.
Note: To calibrate a single display that is not part of a video wall, enter a size of 1x1.
22 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Next the corner location of the rst display in the layout will be selected.
This should generally be the display with the lowest MONITOR ID, or IP address, so that sequential IDs or IP
addresses can be automatically assigned to the rest of the displays. This display will also be the rst one to be
measured and calibrated when automatically performing these actions on all displays.
Next the order of remaining displays can be selected. Again, this selection determines how sequential IDs or IP
addresses will be automatically assigned to the rest of the displays, and the order of measurement and calibration.
Keep in mind that the automatically assigned IDs or IP addresses can be modied later if necessary.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 23
Next the connection method of the displays is selected.
In this example a LAN connection from the host PC will be used. The rst display has been assigned IP address
192.168.0.1. All of the remaining 5 displays in the video wall will use an RS232 daisy-chain to communicate via the
LAN connection on the rst display.
Next the connection method for the remaining displays must be selected. Two options are available in this case
because displays connected to the LAN can either have their own IP address and be connected to the LAN, or they
can be connected to the rst display via daisy-chained RS232.
In this example they are daisy-chained to the rst display by RS232.
24 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Lastly the ID of the rst display is entered. The remaining displays in the layout will be assigned sequential IDs.
In this example, the rst display has MONITOR ID 1.
Clicking Finish will end the wizard and the project will be automatically congured.
It is possible to see the resulting connection conguration by opening the Summary window.
In this example all 6 displays have been assigned the same IP address in the software, even though only the rst
is actually connected to the LAN, because all communications from the host PC will go through the LAN address of
Display 1. Also note that each display has been assigned a sequential MONITOR ID. The display OSD setting for
EXTERNAL CONTROL is set to RS232 for Displays 2-6, and LAN for Display 1.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 25
Calibration Times
Once the displays have been connected and congured, and the layout has been congured and veried in the
software, the time taken to calibrate the video wall will depend on the number of displays and some of the Target
parameters and Preference settings.
It will typically take about 30 seconds to measure each display. Once measured, the calibration process should take
about 2 minutes per display, however this can take longer if:
More than the default (16) number of Grayscale Calibration steps is selected in the Preferences.
•
The Extended Intensity stabilization time option in the Preferences is selected.
•
Note: If the Intensity setting in the current Calibration Target is set to Maximum Possible Per Display, it is not
necessary to perform the Measurement steps. This is because each display will be calibrated to the maximum
possible Intensity that it can achieve, and only the white point will match with the other displays. So it is not
necessary to rst measure all of the displays in order to calculate which is the dimmest display.
Likewise if Specic Level is being used for the Intensity setting of the current Calibration Target, and the level
value being used can be achieved by all of the displays at the specied white point, then the Measurement process
can be skipped. For example if it is known (from a previous set of measurements) that all of the displays can achieve
an Intensity of at least 400 cd/m2 at a particular White Point, then if a Target Intensity level of 300 cd/m2 is used, it
would not be necessary to perform the Measurement step.
The following table shows some example typical calibration times for various sized video walls:
Wall Size Measurement Time
(minutes)
2x2 2 16 18
4x4 8 32 40
5x5 12.5 50 62.5
6x6 18 72 90
Note: When measuring and calibrating the video wall, the software will automatically move to the next display once
the current display has been completed. The next display will be indicated by the screen on that display ashing
alternating green and red. The software will wait until the color sensor has been placed on the display screen before
automatically proceeding with the measurement or calibration process.
Calibration Time
(minutes)
Total Time
(minutes)
Video Inputs
Each video input can have its own settings for various controls, such as Brightness, Gamma Selection, Picture
Mode etc.
During calibration the settings for the currently selected video input are automatically congured. However if other
video inputs are going to be used as well with the video wall, then the settings for those inputs will need to be
correctly congured to use the calibrated settings.
After calibration, use the Calibration tab on the Display Settings dialog to apply the calibration settings to other
video inputs.
26 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Dialogs, Settings and Menus
4
Main NEC Display Wall Calibrator window
The NEC Display Wall Calibrator window shows the current settings and status of the display calibration. All of the
features of NEC Display Wall Calibrator are accessed from this window and the menus.
Some of the main features of this window are shown below.
Actions panel
Controls the main operations
of the calibration process.
Connection panel
Shows the communications
connection settings for the currently
selected display. Settings can be
modied if necessary.
Display layout diagram
Shows a visual representation of
the video wall layout. Individual
displays can be selected by clicking
on a rectangle.
Calibration Target
Shows the current Calibration Target
settings. Click Edit... to open the
Calibration Target Conguration dialog
box used to modify Target settings.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 27
The main area in the window shows a visual representation of the current video wall layout. Each rectangle
represents a display. The color of the rectangle shows the current status of a particular display. This coloring
makes it easy to see the status even when viewing from a distance.
Within each rectangle the displays sequence number is shown. This number is used to identify each display, and
the number ordering represents the order in which displays will be measured and calibrated when performing
operations on multiple displays.
Individual displays can be selected by clicking on a rectangle. The currently selected display is highlighted by
a rectangle.
The layout, including the number of rows and columns in the video wall, and order of the displays is congured
by using the Layout Wizard.
An individual display can be excluded from the current project by disabling it. To
disable a display, right click within the rectangle and select Disable. This feature
can be used for example if the video wall layout is not a rectangular shape.
An individual display can also be made to ash temporarily so it can be visually
identied in the video wall. This is useful to verify that a display is correctly
congured and appears at the correct location in the video wall layout. To identify
a display, right click within the rectangle and select Identify.
Additional information about a display is shown in a ToolTip by hovering the
pointer over a rectangle.
28 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Edit Calibration Target Conguration dialog
The Edit Edit Calibration Target dialog is accessed by clicking the Edit... button on the Calibration Target
panel in the main NEC Display Wall Calibrator window, or by selecting Target... from the Edit menu.
The Target denes the parameters for the calibration process and determines the color characteristics for
calibrating each display. Changing the Target settings after calibrating the displays will normally mean they will
all need to be re-calibrated to the new settings.
Intensity
The Intensity selects the luminance or “brightness” of white for the calibration.
Options are:
Maximum Possible Matching - Calibrates all of the displays to the maximum possible luminance
•
that can achieve a match in both Intensity and White Point. Use this option if you want all of the displays
to match in both color and brightness. All of the displays will only be as bright as the dimmest display.
Maximum Possible Per Display - Calibrates all of the displays to the maximum possible luminance
•
that each individual display can achieve, and matches the white points on all displays. Use this option
if you want all of the displays to match in color, but are not concerned if they match each other in
luminance.
Specic Level - Calibrates all of the displays to a specied target value of luminance, and also
•
matches the white points on all displays. If a display can not achieve the specied value, it will be
calibrated to the closest possible Intensity, and a warning icon will be displayed after the calibration has
completed. Use this option if your application requires a specic luminance, but keep in mind that each
display must actually be capable of achieving that value.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 29
White Point
White Point selects the Target white point for the calibration. Several popular industry standard White Point
values, such as 9300K and D65, are provided.
A custom white point can be specied by clicking the Edit...
button to open up the Custom Color Temperature dialog.
If the absolute highest possible Intensity is needed for an
application and the White Point does not need to be a particular
value, then the Calculate Highest Intensity White Point
function can be used to calculate the White Point that gives the
highest overall Intensity. This White Point value is calculated
from the “native” or un-calibrated measurements taken from
all of the displays so all displays should be measured before
using this function. Clicking the Calculate Highest Intensity
White Point button will update the current White Point with the calculated value.
Gamma Curve
Gamma Curve selects the desired tone response curve of the calibrated displays.
Options are:
Monitor Native Gamma - No correction is applied and the display’s Look Up Tables are set to linear.
•
Gamma Curve Value - The response curve will follow a simple gamma curve. Values between 1.0
•
and 3.0 can be entered. A gamma value of 2.2 is popular for most applications.
DICOM Curve - The response curve follows the DICOM (Digital Imaging and Communications in
•
Medicine) specication. This response curve is aimed at medical use, however it can be used for other
applications. The goal of the DICOM response curve is to have a visually linear display response.
Custom Curve - Advanced and custom response curves can be selected from presets or created by
•
importing a table of values. Click the Edit... button to open the Custom Gamma Curve dialog.
Contrast Ratio
Contrast Ratio allows a particular contrast ratio to be used if necessary. The contrast ratio is the ratio of white
to black luminance.
Selecting Default will calibrate the display to the highest possible contrast ratio, which is limited by the display
technology, the selected White Point, Intensity value, and other factors.
In some applications, for example simulating low contrast images
such as in newsprint, it is useful to have a lower contrast ratio than
the display’s native value. Contrast Ratios in the range of 50:1 to
500:1 can be selected.
Note: If the selected contrast ratio is higher than what the display
is actually capable of achieving, then the display will calibrate to
the highest possible contrast ratio. If a specic Contrast Ratio is
selected, it is recommended that the number of Calibration and
Measurement Steps be set to at least 32 in the Preferences
dialog.
30 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Custom Gamma Curve dialog
The Custom Gamma Curve dialog is accessed by clicking the Edit.. button in the Gamma Curve section of
the Edit Calibration Target dialog.
Advanced response curves can be selected from presets or custom curves can be created by importing a table
of values.
The following preset curves are available:
sRGB - A curve based on the sRGB specication that includes the offset, transition and slope
•
components.
L* - A curve based on L* in the Lab specication. The L* curve is intended to be more perceptually
•
uniform than a simple gamma value curve.
NTSC Video - A curve based on the SMPTE-170M specication for NTSC that includes the offset,
•
transition and slope components.
SMPTE-240M - A curve based on the SMPTE-240M specication for 1125 line HD video that includes
•
the offset, transition and slope components.
Custom curves can be created and imported into NEC Display Wall Calibrator by creating a text le with a list
of numerical values. The text le must conform to the following specications:
Must contain between 3 and 256 values.
•
Each value must be on a separate line.
•
The rst value must be 0.
•
Values must be monotonically increasing.
•
When imported, the values will be automatically scaled and interpolated to create a Target curve.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 31
Custom White Point dialog
The Custom White Point dialog is accessed by clicking the Edit.. button in the White Point section of the Edit
Calibration Target dialog.
A custom White Point can be created by either specifying it as a Black Body radiator temperature in Kelvin, as
CIE (xy chromaticity) Coordinates, or by taking a measurement.
Values between 2500K and 10000K may be entered in the Black Body K eld. The corresponding CIE xy
coordinates are automatically calculated and displayed for reference.
CIE xy chromaticity coordinates can be entered by selecting the CIE Coordinates radio button and entering the
x and y values. The corresponding correlated black body radiator temperature and Δuv (Delta-uv) values are
automatically calculated and displayed for reference. The Delta-uv value indicates how far the xy coordinates
entered are from the black body radiator locus.
A custom White Point may be measured using the calibration sensor, and automatically entered in the CIE
xy chromaticity coordinate elds by clicking the Measure button. This is useful for “cloning” the white point of
another display monitor.
32 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Preferences dialog
The Preferences dialog is accessed from the Edit menu, and is divided into 3 different tabs.
The default settings for the entire Preferences can be restored by clicking the Defaults button.
Preferences dialog - Calibration Sensor tab
Sensor Type - Selects the model of calibration sensor to use, and shows the current model being used.
Auto-Detect - Attempts to detect the selected model of calibration sensor. NEC Display Wall Calibrator will
automatically detect the calibration sensor when the application is started, however if the sensor was not
connected at that time, or if it was being used by another application, then it may be necessary to re-detect it.
Note: If the sensor was not attached when NEC Display Wall Calibrator was launched, then it may be necessary
to exit the NEC Display Wall Calibrator application and launch it again. In some cases it may be necessary to
re-connect the USB sensor for it to be detected.
Model and Serial Number - Shows the model and serial number of the currently selected calibration sensor
device.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 33
Preferences dialog - Calibration tab
Calibration and Prole Steps - Selects the number of measurement steps to take when calibrating the
display. A larger number of steps will generally result in a more accurate grayscale calibration, but will increase
the calibration time. 16 steps is the recommended setting for most applications.
Intensity Adjustment - Sets how a particular Intensity value is achieved during the calibration process if
necessary.
Options are:
Use Brightness Control - The Brightness control on the display is used if necessary to achieve the
•
target Intensity. This will provide the best possible Contrast Ratio and also lowest power consumption
(assuming the target Intensity used results in the brightness control being reduced from maximum).
Adjusting the Brightness control can increase the calibration time slightly, and the Intensity may drift
slightly after being adjusted. Because the range of the Brightness control is limited, any additional
adjustments necessary to achieve the target Intensity are done using the internal LUTs.
Leave Brightness Control at Maximum - The Brightness control on the display is set to the
•
maximum value and any adjustments necessary to achieve the target Intensity are done using
the internal LUTs. This may give a slightly lower calibrated Contrast Ratio, and the display power
consumption will always highest. The calibration time is fastest for this method.
Do not adjust Brightness Control - The Brightness control on the display will not be adjusted
•
from the current setting. Any adjustments necessary to achieve the target Intensity are done using the
internal LUTs if possible. This option allows the Brightness to be manually adjusted before calibration if
necessary. Since the Brightness control is not adjusted, the Intensity can not be increased if necessary
during calibration.
Extended luminance stabilization time - Increases the waiting time for the display to stabilize while the
luminance is being adjusted by using the Brightness control. This option can be used if necessary to increase
the accuracy of the luminance adjustment when a Target with a Specic Level of Intensity is being used. It may
signicantly increase the calibration time, and is normally only useful when a very low intensity value is used.
Try selecting this option if the Intensity measured after calibration is signicantly different than the Target value
due to the display stabilizing during the calibration and proling steps.
34 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Preferences dialog - Interface tab
Luminance Units - Selects the units that luminance values are displayed in. Options are:
Candelas (cd/m²)
•
Foot Lamberts (fL)
•
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 35
Panels
Various Panels are available within the main window for controlling the operation of the software and for setting and
viewing the status of various settings.
Panels can be closed either by selecting them from the View menu, or clicking the close icon on each panel. Panels
can also be rearranged and even moved outside of the main window if desired, by dragging the title bar of the
panel.
The functions of each panel are described in detail below:
Actions panel
This panel is used to perform the major operations in the application. The various
buttons will be disabled and enabled depending on the stage of the calibration
process.
Generally operations for calibrating the display are done in the same order as the
buttons.
Verify All - This will attempt to communicate with each display in the layout in order
to verify that each display is accessible and correctly congured. If a display fails
this step, then follow the troubleshooting guide in chapter 7. Once all displays have
been veried, it is possible to go on to the next step.
Initialize All - This will reset each display to the default color settings so that the
“native” performance of each display can be measured before the calibration.
Settings such as the Brightness, Color mode, Contrast etc. will be reset.
Measure Selected - This will measure the default “native” color characteristics of
the currently selected display. These measurements will determine the maximum
possible Intensity that will give a color match with all the displays. You will be prompted to place the sensor on
the screen while the software displays various test patterns and takes measurements.
Measure All - This is the same as Measure Selected, except that all displays will be measured sequentially. You
will be instructed which display to place the color sensor on while the software displays various test patterns and
takes measurements. This will repeat until all displays are measured.
There is no need to interact with the host PC while the displays are being measured with this option, since the
next display is selected automatically and the routine will wait until the color sensor is placed on the screen
indicated. This is useful if it is not convenient to have the host PC nearby, for example when standing on a
ladder.
Calibrate Selected - This will calibrate the currently selected display to the Target settings. You will be
prompted to place the sensor on the screen while the software displays various test patterns and takes makes
adjustments.
Calibrate All - This is the same as Calibrate Selected, except that all displays will be calibrated sequentially.
You will be instructed which display to place the color sensor on while the software displays various test patterns
and makes adjustments. This will repeat until all displays are calibrated.
There is no need to interact with the host PC while the displays are being calibrated with this option, since the
next display is selected automatically and the routine will wait until the color sensor is placed on the screen
indicated. This is useful if it is not convenient to have the host PC nearby, for example when standing on a
ladder.
36 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Connection panel
This panel is used to modify the communications connection
settings for the currently selected display in the layout.
Connection types of RS232 or LAN (Ethernet) can be
selected.
Is using RS232, the RS232 COM port on the host PC used
to communicate with the displays can be selected. Currently
available COM ports on the host PC are listed in COM Port:.
Otherwise, if using LAN, the IP Address of the display can be
entered. See Chapter 8 for instructions on how to assign the
IP address for each display.
For both communications types, the Monitor ID of the display
must be selected and this must match the ID selected on the
display’s OSD setting. If displays are daisy-chained together
using RS232, each display must have a unique Monitor ID
assigned that must match that set on the display’s OSD setting.
The communications settings and link to the display can be tested by clicking the Test button. This will attempt
to communicate with the display on the selected communications interface and Monitor ID.
Clicking the Update button will update the communications connection settings for the currently selected display
in the layout.
Note: If changes have been made, but the Update button has not been clicked, then the changes will be lost if
another display is selected in the layout.
Calibration Target panel
This panel shows the Calibration Target settings that will be
used when the displays are calibrated.
The Calibration Target settings can be modied by clicking
Edit... which will open the Edit Calibration Target dialog.
White Point shows the Target White Point.
Gamma shows the Target gamma or Tone Response Curve
type.
Intensity shows the Target display intensity adjustment
method and value.
Note: When using the Maximum Possible Matching method
for Intensity, the actual value used to calibrate all of the
displays will not be shown until all of the displays have been
measured, and the Target calculated.
Contrast Ratio shows the Target contrast ratio.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 37
Colorimeter panel
This panel allows measurements of colors displayed on the
screen to be taken with the calibration sensor and the numerical
results are displayed.
To take color measurements using the Colorimeter, display
a white image on the screen to be measured and place the
calibration sensor on the screen. Then click the Measure button
to take a single color measurement and display the results.
The measurement results are shown in CIE xyY and Color
Temperature.
The Color Temperature eld shows the corresponding
correlated black body radiator temperature of the measurement
in Kelvin. The Δuv (Delta-uv) value indicates how far the measurement is from the blackbody radiator locus.
The Kelvin value is only meaningful for colors that are near the black body radiator locus, such as most shades
of white.
This feature can be used together with the Test Patterns tool to verify the calibration accuracy of a display.
In this case the Calibrated White function in the Test Pattern panel can be used to show a calibrated white
screen, then the sensor can be used to measure the screen.
It can also be used to measure the native white point of a display by using the 100% White function in the Test
Pattern panel to show a native white screen, which can then be measured using the sensor.
38 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Test Pattern panel
This panel is used to display test patterns on either the
currently selected display, or all of the displays in the layout.
Test patterns can be used to visually evaluate the displays
both before and after calibration.
Two patterns are available, 100% White, and Calibrated
White.
The 100% White pattern is native white with no correction
applied by the calibration.
The Calibrated White pattern is only available if the display
has been calibrated and shows the adjusted white after
calibration. It is useful to visually evaluate the calibration
accuracy.
Clicking Off will turn off the test patterns.
The Test Patterns can either be shown on the selected display, or all displays, by selecting the appropriate
setting in Apply to:.
Note: Since there is a slight color shift with viewing angle, when evaluating the color calibration uniformity
across multiple displays, be sure to stand as far back as possible from the video wall, and evaluate from directly
in front of the screens.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 39
Reset panel
This panel is used to reset and restore measurements and
settings.
Reset Measurement Data - Will clear all of the measurements
taken during the Measurement phase of the calibration.
Reset Calibration Data - Will clear all of the calibration data
including measurements and adjustment settings. It will not
reset any settings in the displays.
Restore Calibration Settings - Will re-congure displays
with the settings from the last calibration. This can be useful
to switch between different calibrations by loading different
projects, and restoring the calibration data to all of the
displays.
Since the calibration settings are stored as part of the Project
les, entire wall calibrations can be restored as necessary by
loading a Project le, and using this function to restore the calibration settings to the displays.
These functions can either be applied to the selected display, or all displays by selecting the appropriate setting
in Apply to:.
40 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Display Measurements panel
This panel shows the measured White Point values from the
color sensor taken during the Measurement and Calibration
operations. Both the White Point and Intensity (luminance)
are shown as numerical values and graphically.
The White Point shows the measured value compared to the
Target White Point in CIE xy.
This gives an indication as to the accuracy of the calibration
compared to the Target value, as well as how far the display
needed to be adjusted from the native state in order to achieve
the Target White Point.
The Intensity bar shows the measured value. If the Target
is a specic value, then red arrows indicate this level on the
bar.
Uncalibrated - Shows the native or un-calibrated
measurement taken during the Measure operation.
Calibrated - Shows the corrected or calibrated measurement
taken during the Calibration operation.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 41
Display Settings dialog
The Display Settings dialog is accessed from the Edit menu, and is divided into 5 different tabs. Various
settings on the displays can be set and read from this dialog. Settings can be applied to either a single display,
or to all of the displays in the current project by selecting either Selected Display or All Displays.
Display Settings dialog - Power tab
The Power tab controls the power of the displays.
Clicking the On button will turn the display or displays on.
Clicking the Off button will turn the display or displays off.
When Single Display is selected the current power state of the
display is shown.
Display Settings dialog - Clock tab
The Clock tab is used to set and report the internal real time clock
in the display.
The internal clock can be set to the host PC’s system date and
time by clicking the Set to system date & time button.
When Single Display is selected, a custom time and date can
be set in the display by modifying the Time and Date elds and
clicking the Set to custom date & time button.
When a single display is selected using Single Display, the
current time and date of the clock in the display is shown.
42 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Display Settings dialog - Input tab
The Input tab is used to set and report the current video input
selected on the display.
When Single Display is selected the Video Input list shows the
current video input being used by the display. The video input can
be changed by selecting the desired input from the list.
When All Displays is selected the Video Input list does not show
the current video input. The video input can be changed for all of
the displays in the project by selecting the desired input from the
list and clicking the Update button.
Display Settings dialog - Video tab
The Video tab is used to perform analog video signal adjustment.
The controls are only available when analog video inputs such
as VGA, RGB/HV, and Option-Analog. It is not necessary to recalibrate the displays after performing these operations.
Analog Auto-Setup will measure the incoming analog video signal
and automatically set the video level controls in the display as well
as the size and position of the video.
This operation should be performed whenever a new analog video
signal is connected, when a major change is made to the video
wiring to the display, or when a video amplier or splitter is added
to the video link.
Note: It is essential that when this operation is performed a video
signal that contains both pure black and pure white is being input.
White video should extend to each edge of the active video area,
otherwise the controls may not be adjusted correctly by the display.
A sample test pattern is installed with the software and should be
displayed full-screen on the video source input.
Analog Auto Bias/Gain Setup will measure the incoming analog
video signal and automatically set the video level bias and gain controls in the display.
This operation should be performed if there is a color tint on black video after the display has been calibrated.
Note: It is essential that when this operation is performed a color bar test pattern video signal is input, otherwise the
controls may not be adjusted correctly by the display. A sample test pattern is installed with the software and should
be displayed full-screen on the video source input.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 43
Display Settings dialog - Calibration tab
The Calibration tab is used to apply the various calibration settings
to video inputs other than the input that was selected when the
display was calibrated.
Each video input can have its own settings for various controls,
such as Brightness, Gamma Selection, Picture Mode etc.
During calibration, the settings for the currently selected video
input are automatically congured. However if at some point in time
other types of video inputs will be used with the video wall, then
the settings for those inputs will need to be correctly congured to
use the calibrated settings.
Select the video inputs to apply the calibrated settings to and click
the Apply button.
Display Settings dialog - Status tab
The Status tab reports various aspects about the currently
selected display. This feature is not available when All Displays
is selected.
Operating Hours - Shows the number of hours that the currently
selected display has been in operation.
Fan 1, 2, and 3 - Shows the current operating status of the
internal cooling fans of the display. On, Off and Error conditions
are reported.
Temperature Sensor 1, 2, and 3 - Shows the current internal
temperature sensor readings of the display.
Diagnostics - Shows the diagnostic condition reported by the
display, as well as various failure conditions such as power supply,
fan, and temperature abnormalities.
44 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Summary window
The Summary window is accessed from the View menu.
This window shows the current layout conguration and connections, as well as detailed information about the
calibration results.
Connection Summary:
Port - Shows the Communications Port to the display, either the RS232 COM Port, or LAN IP Address.
Monitor ID - Shows the Monitor ID used to identify the display monitor.
Model - Shows the model of the display monitor.
Serial Number - Shows the serial number of the display monitor.
Status - Shows the current status of the display monitor in the measurement and calibration process.
Calibration Summary:
Uncalibrated Intensity – Shows the measured native Intensity (luminance) of the display when un-calibrated.
Uncalibrated White Point – Shows the native white point of the display when un-calibrated.
Uncalibrated Contrast Ratio – Shows the native contrast ratio of the display when un-calibrated.
Maximum Calibrated Intensity – Shows the calculated maximum Intensity that can be achieved by the display
using the current Target White Point setting. If the current Target Intensity method is set to Specic Level and
the calculated value is more than 5% lower than the Target, then a yellow warning icon is shown to warn that
the displays may not match in Intensity after calibration using the current Specic Level value, and a lower value
should be chosen.
Date Measured – Shows the date and time that the un-calibrated measurements were taken.
Operating Hours when Measured – Shows the number of hours the display has been in operation at the time
the un-calibrated measurements were taken.
Actual Calibrated Intensity – Shows the Intensity (luminance) of the display after it has been calibrated. If the
current Target is set to Maximum Possible Matching or Specic Level and the value is not within 10% of the
Target Intensity value, then a yellow alert icon is shown to warn that the display could not achieve the desired
Target Intensity value when calibrated.
Actual Calibrated White Point – Shows the white point that the display was adjusted to after calibration.
Date Calibrated - Shows the date and time when the calibration was performed.
Operating Hours when Calibrated – Shows the number of hours the display has been in operation when the
calibration was performed.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 45
Brightness Setting – Shows the OSD Brightness setting value that the display was adjusted to when the
calibration was performed.
Menus
File menu
New Project - Creates a new project and erases all of the current data.
Open Project... - Opens an existing Project le.
Save Project - Saves the current Project to a le.
Save Project As... - Saves the current project with a new le name.
Exit - Closes the application.
Edit menu
Preferences... - Opens the Preferences dialog.
Layout Wizard... - Opens the Display Layout Conguration Wizard.
Calibration Target... - Opens the Edit Calibration Target dialog.
Display Settings... - Opens the Display Settings dialog.
View menu
Summary - Opens or closes the Summary window.
Connection - Hides or shows the Connection panel.
Calibration Target - Hides or shows the Calibration Target panel.
Colorimeter - Hides or shows the Colorimeter panel.
Display Measurements - Hides or shows the Display Measurements panel.
Test Pattern - Hides or shows the Test Pattern panel.
Status - Hides or shows the Status panel.
Help menu
About... - displays the About dialog box which shows the software version number.
Check for updates... - contacts the NEC Display Solutions website and checks to see if a newer version of
NEC Display Wall Calibrator is available. If a newer version is available, information about the version and
download links will be shown. An Internet connection is required for this feature to operate.
46 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Quick Start to NEC Display Wall Calibrator
5
1. Install Software
Install the NEC Display Wall Calibrator software on the host PC. The serial number provided on either the CD-ROM
cover, or with your purchase will be required to install the software.
2. Connect color sensor
Connect the color sensor to a USB port on the host PC and verify the drivers are installed correctly.
3. Warm up displays
Power-on each of the displays in the video wall. The displays should be warmed up for at least 30 minutes before
calibrating.
4. Congure and connect displays
It is not necessary to connect the video output from the PC to any of the displays. The only connection to the
displays will be either RS232 and/or LAN (Ethernet). Wireless LAN can also be used from the host PC if using a
wireless access point or router.
See chapter 3 for detailed information about the various connection congurations.
5. Dene Video Wall Layout and Connections
Use the “Layout Wizard” from the Edit menu to specify the number of displays, their layout, calibration order, and
connection method.
If necessary modify the connection settings for any display by using the Connection panel.
6. Verify Communications
Test the communications to all the displays by clicking the Verify All button on the Actions panel. This will attempt to
communicate with each display in the layout.
If there is an error in verifying communications with a display, see the troubleshooting guide in chapter 7:
As each display is successfully tested, it’s rectangle in the main window will change from Yellow to Cyan. Once all
displays are veried, it is possible to continue on with the next stage of the calibration process.
7. Initialize Display Settings
Click the Initialize All button on the Actions panel to reset the color settings on each display to the default state.
8. Measure displays with default settings
If Maximum Possible Matching is selected as the Intensity adjustment method in the current Calibration Target, it
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 47
will be necessary to measure the color characteristics of each display so the software can calculate how to match
all the displays. These measurements will determine the maximum possible Intensity that will give a color match
with all the displays.
Click the Measure All button on the Actions panel to start the measurement process. You will be prompted to place
the sensor on the screen of each display in turn. The display to place the sensor on will ash alternate red and green
colors until the sensor has been positioned on the screen. Place the sensor at against the center of the screen,
and hold it steady while applying the minimum force possible.
The software will then automatically measure the display characteristics which will take about 30 seconds. When
complete, the next display to be measured will ash and this process will continue until all displays are measured.
As each display is successfully measured, its rectangle in the main window will change from Cyan to Magenta.
9. Dene the Calibration Target
Select Calibration Target… from the Edit menu, or click the Edit… button in the Calibration Target panel to open
the Edit Calibration Target dialog. The default values are suitable for most applications. If necessary for a particular
application, custom settings for the method of Intensity adjustment, desired White Point, Gamma value, and Contrast
Ratio can be selected.
10. Calibrate displays
Click the Calibrate All button on the Actions panel to start the calibration process. You will be prompted to place the
sensor on the screen of each display in turn. The display to place the sensor on will ash alternate red and green
colors until the sensor has been positioned on the screen. The software will then automatically calibrate the display
which will take 2 minutes or more.
When complete, the next display to be calibrated will ash and this process will continue until all displays are
calibrated.
As each display is successfully calibrated, its rectangle in the main window will change from Magenta to Green.
11. Evaluate results
Once the calibration process is completed, the results can be visually evaluated by using the Test Pattern feature.
On the Test Pattern panel, select All displays, and click the Calibrated White button.
Note: Since there is a slight color shift with screen viewing angle, so be sure to evaluate the video wall from a
distance and from directly in front.
Click the Off button to turn off the test patterns.
The numerical results of the measurement and calibration process are available by selecting Summary from the
View menu. This window shows the connection settings for all of the displays, including the model and serial
number information for each display.
If the displays do not match well when showing an analog video signal, this indicates that the analog video signal
levels may need to be adjusted to compensate for variations that may cause color shifts between displays. See the
Analog Inputs - Important Notice for more information.
12. Save
Save the project le so it can be used again in the future to re-calibrate the displays when necessary.
48 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Frequently Asked Questions
6
Calibration
Question: Can I use NEC Display Wall Calibrator to calibrate a single display?
Answer: Yes. Use the Layout Wizard to create a layout with a 1x1 video wall, and calibrate as normal.
Question: How often will I need to use NEC Display Wall Calibrator to re-calibrate a video wall?
Answer: The time until the displays need to be re-calibrated will depend on many factors such as the environment
and duration they are used, the age of the displays, the calibration Target settings used, and how critical the color
matching requirements are. Newer displays will tend to drift more rapidly than displays that have been in use for
several days or weeks. Typical re-calibration periods could be six months for most applications and as low as one
month for color critical applications.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 49
Troubleshooting
7
Installation and Setup
Problem: Measure and Calibrate buttons are disabled.
Solution: The Measure and Calibrate buttons are disabled for any of the following reasons:
No supported calibration sensor was detected.
•
No supported display monitor was detected.
•
All of the displays have not yet been Veried.
•
Problem: Verify Communications operation fails.
Solution: Check that:
Each display is correctly congured to use either then LAN or RS232 interface by conrming the
•
EXTERNAL CONTROL setting on the OSD menu.
The MONITOR ID is set correctly on the OSD and matches the value assigned in the software.
•
If using RS232:
If using daisy-chaining, conrm that no other displays on the same chain have the same MONITOR ID.
•
Make sure that each display is connected via a NULL modem cable and that the correct IN our OUT
•
socket on the display is used.
Make sure that no other application or process is using the specied COM port.
•
If using LAN:
Make sure that the IP address of each display is set correctly and that each display has a unique IP
•
address.
Make sure that the IP address assigned to each display matches those assigned in the software.
•
Make sure that no other device on the LAN is assigned the same IP address.
•
The IP address of each display must be congured using a web browser. The default IP address is
•
192.168.0.10.
Make sure that the displays are on the same subnet as the host PC being used.
•
Make sure that there are no rewall settings or antivirus applications that may be preventing the
•
application from accessing the LAN.
50 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Calibration
Problem: When switching to different video inputs the displays no longer match.
Solution: Each video input can have its own settings for various controls, such as Brightness, Gamma Se-
lection, Picture Mode etc.
During calibration the settings for the currently selected video input are automatically congured. However if
other video inputs are going to be used as well with the video wall, then the settings for those inputs will need
to be correctly congured to use the calibrated settings.
Use the Calibration tab on the Display Settings dialog to apply the calibration settings to other video inputs.
Problem: When showing the Calibrated Test Pattern the displays in the video wall match. However when an
analog video signal is shown they no longer match.
Solution: Differences in the analog video signal level between displays may cause the displays not to match.
The Auto-Setup operation should be performed on each display which will measure the incoming analog video
and automatically set the video level controls in the display.
This operation may need to be performed each time a new analog video signal is connected, or if a major
change was made to the video wiring to the display, or a video amplier or splitter was added to the video
source.
Auto-Setup can be accessed from the OSD on each display or by using the Video tab in the Display Settings
dialog available from the Edit menu.
Note: This adjustment process requires specic patterns to be displayed on the video signal in order for the
display to automatically adjust the video signal levels correctly. Failure to display the correct signal may result
in the video levels being incorrectly set and the displays may not match in color when using an analog video
source.
Problem: “Error: No reply from the display” message is shown during the calibration when using a USB to
RS232 adapter.
Solution: Certain models of USB to RS232 adapters may not function correctly with NEC Display Wall
Calibrator and may cause an “Error: No reply from the display” message during the calibration process. The
display will be detected correctly, but the calibration will fail at a certain point.
This issue is caused by an incompatibility with the USB to RS232 adapter and drivers that causes long
messages sent to the display to not be transmitted correctly.
If you encounter this error, please check with the hardware vendor to see if newer device drivers are available.
If this does not solve the issue, try using a different model of USB to RS232 adapter.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 51
Color Sensor
Problem: Software is unable to detect the X-Rite ColorMunki
Solution: If the X-Rite ColorMunki software is installed, it will prevent NEC Display Wall Calibrator from accessing
the device even if the main ColorMunki application is not currently running.
If you are using the ColorMunki software prior to version 1.1.0
NEC Display Wall Calibrator will detect if the ColorMunki software is running and give the option of closing
•
it automatically.
To use the ColorMunki software again after NEC Display Wall Calibrator has closed it, you must run the
•
colormunki.exe application from the Startup menu in Windows.
If you are using the ColorMunki software version 1.1.0 or newer:
You must turn off the ColorMunki Service in the Windows Control Panel > “X-Rite Device Services” to
•
allow NEC Display Wall Calibrator to access the device.
To use the ColorMunki software again you must turn the ColorMunki Service back on.
•
52 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Assigning an IP address
8
Displays connected via LAN need to be assigned an IP address so that they can be remotely accessed. Each
display with a LAN interface has a default IP address of 192.168.0.10. This address must be changed in order to
avoid conicts when other displays are connected to the LAN. When the LAN RESET operation is performed on a
display’s OSD, the IP address will be reset to the default value.
It is recommended to assign the IP address of a display by connecting a PC directly to the LAN port on the display,
or via a LAN HUB while no other devices are connected.
If the PC being used to set the IP address of the display is not currently set to access the subnet that includes the
display’s defaults IP address, it will be necessary to temporarily modify the network settings in order to assign the
PC a temporary IP address and subnet so that the display can be accessed. Once the display has been congured
the PC network settings should be restored.
Open the Network Settings properties of the PC, and select Internet Protocol
TCP/IP in the list, then click the Properties button.
Next enter a temporary IP address for the PC, such as 192.168.0.255, and a
subnet mask of 255.255.255.0. Click OK and close the Network Settings.
Next open a web browser and go to the URL of the display’s web server by entering:
http://192.168.0.10
This should display the display’s MONITOR NETWORK SETTINGS page.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 53
If this page can not be reached, :
Conrm that the display is powered on and connected to the PC either directly or via a HUB.
•
Conrm that the IP address assigned to the display is at the default value, by performing a LAN RESET
•
from the OSD on the display.
Conrm that the EXTERNAL CONTROL setting on the OSD is set to LAN.
•
Try refreshing the web page in the browser. It may take several refreshes before the display can be found.
•
Check if any rewall software or settings on the PC could be preventing access to the display’s IP
•
address.
Once the web page has appeared, the display’s IP address and subnet mask can be entered and updated in the
display. It is highly recommended to assign each display a static IP address so that the IP address will not be
reassigned to another device if the network is reset.
Note: Once the IP address is updated, the display will no longer be accessible from the current IP address.
Next restore the original network settings on the PC.
54 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Glossary
Achromatic – Neutral in color (having no hue).
Additive Primaries – Red, green, and blue light that when combined in different relative inten-
sities produces different colors. (See also Subtractive Primaries)
Backlight – the internal light source for a Liquid Crystal Display, such as uorescent lamps or
array of LEDs (Light Emitting Diodes).
Blackbody – A hypothetical object that absorbs all incident radiation, thus any radiation (e.g.
light) coming from a blackbody must be emitted from it and not reected.
Blackbody Radiator Locus – The curve formed when the color of light radiated from a black-
body is plotted at different temperatures on a color space such as CIE xyY.
Black Level – The luminance or “brightness” of black when displayed on the screen.
Calibration – The process of bringing a device such as a display monitor to an absolute stan-
dard to ensure consistency over time and with other similarly calibrated devices.
Candelas (cd) – An international unit of light intensity. Luminance can be described in units of
Candelas per meter squared (cd/m²) but is often referred to as just Candelas or Nits for sake of
brevity.
CCFL – Cold cathode uorescent lamp used for the backlight on LCD display panels.
CIE – The Commission Internationale d’Eclairage (International Commission on Illumination).
An organization that sets many of the standards used in color and color measurement.
CIE uv chromaticity coordinates – Coordinates in the CIE uv color space which are derived
directly from CIE xyY color space. CIE uv is more perceptually uniform than CIE xy.
CIE xy chromaticity coordinates – Coordinates in the CIE xyY color space representing color
independent of luminance.
CIE xyY – A standard color space in which the Y component represents luminance. The x and
y components represent color.
Color Gamut – (See Gamut)
Colorimeter – An optical measurement device used to measure color that responds to light by
separating it into red, green, and blue components.
Color Temperature – The color of light given off by an object, known as a blackbody, as it is
heated to a given temperature in degrees Kelvin. Low color temperatures such as 5000K are
reddish, whilst higher color temperatures such as 9300K are bluish. A color temperature of
6500K is considered to be “neutral” white.
COM Port – The original name of the serial port interface on IBM PC-compatible computers.
NEC DISPLAY WALL CALIBRATOR USER’S GUIDE | 55
Contrast Ratio – The ratio of the white luminance (Intensity) and black luminance (Black
Level) of the display.
Correlated Color Temperature – The closest matching color, expressed in Kelvin, of a white
point that does not lie exactly on the blackbody locus.
D Illuminants – CIE Daylight Standard Illuminants based on approximating daylight. The
subscript denotes the correlated color temperature of the illuminant. For example, D50 has a
correlated color temperature of 5000K.
Delta-E (Δ-E) – A measurement of how different two colors are to each other. In NEC Display
Wall Calibrator, Delta-E values are derived by calculating the distance between two colors in
Lab color space using the CIE 94 formula. A Delta-E value of 1 indicates a just perceptual difference between two colors.
Delta-uv (Δ-uv) – A measure of how different two colors are, irrespective of luminance. In NEC
Display Wall Calibrator Delta-uv values are used to indicate how far a white point is from the
blackbody locus. CIE uv color space is used instead of CIE xy because it is more perceptually
uniform or linear.
Device Gamut – The range of colors that a device can produce.
DICOM – Digital Imaging and Communications in Medicine.
Foot Lamberts (fL) – A unit of luminance. One foot Lambert is equal to 1 Candela per meter
squared divided by 10.76/π (approximately 3.43) .
Gamma – The relationship between the input video signal to a display monitor and the screen
output luminance. Typically the screen luminance follows a mathematical power function of the
input video signal, the exponent of which is called the gamma.
Gamut – The range of colors that can be reproduced on a particular device such as a monitor
or printer, or that can be distinguished by a sensing device such as a scanner or the human
eye.
Hue – The basic attribute of color such as red, green, yellow, blue or purple.
Intensity – Intensity species the luminance or brightness of white when displayed on the
screen.
IP – Internet Protocol.
Kelvin – An absolute temperature scale denoted by K. Zero Kelvin (0K) is equivalent to –273°
Celsius.
Lab – (See CIE Lab)
LAN – Local Area Network
LCD – Liquid Crystal Display.
Luminance – A measure of the brightness or intensity of light, usually expressed in units of
Candelas per meter squared (cd/m²) or foot Lamberts.
Look Up Table (LUT) – A table used to translate input values to output values. NEC Display
Wall Calibrator displays use 10 bit internal LUTs to apply Gamma corrections and Tone Re-
sponse Curves.
56 | NEC DISPLAY WALL CALIBRATOR USER’S GUIDE
Native state – Without any kind of correction or calibration applied.
Nit – A unit of luminance equal to Candelas per meter squared (cd/m²).
OSD – On Screen Display.
RS232 - Recommended Standard 232 is a standard for serial binary data signals.
Saturation – An expression of the amount a color deviates from being achromatic (neutral in
color, such as gray). For example, red is a saturated color, while pink is less saturated, and
white has no saturation.
Subnet – A subnetwork, or subnet, describes networked computers and devices that have a
common, designated IP address routing prex.
TCP/IP – Transmission Control Protocol / Internet Protocol.
Tone Response Curve – A graph representing the relationship between the input and output
of a system or device. In NEC Display Wall Calibrator, Tone Response Curves represent the
relationship between the intensity of a color within an application and the light intensity displayed on the monitor.
USB – Universal Serial Bus. A communication bus used to connect up to 127 devices such as
keyboards, mice, scanners, color sensors, etc.
White point – Species the color of pure “white” on a display, usually as a Color Temperature
expressed in Kelvin or as CIE xy chromaticity coordinates.
Copyright © 2009 NEC Display Solutions, Ltd. All rights reserved.
USA and Canada: www.necdisplay.com
Europe: www.nec-display-solutions.com
Asia Pacic: www.nec-display.com/ap/contact/
Loading...