Panasonic PT-DW7000 User Manual

DLP® Type Projectors

PT-D10000/PT-DW10000
PT-D7700/PT-DW7000
PT-D5700/PT-DW5100

Edge-Blending Adjustment Manual

Feb 12, 2008 Ver.1.0

Sales Group

Projector Business Unit

Panasonic AVC Networks Company

Matsushita Electric Industrial Co., Ltd.

Introduction

The 3-chip DLP type projectors: PT-D7700 and DW10000 series and the 1-chip DLP type
projectors: PT-D5700 and DW5100 are equipped with a multi-screen support system that
facilitates the adjustment of multiple images to obtain the optimum result.

 Edge-blending Function

Connecting the images projected by multiple projectors and automatically controlling the
brightness and hue to produce a natural and unified presentation of multiple images without a
boundary.

 Digital Image Enlargement Function

The projector has a built-in image enlargement function that allows a maximum 10-fold
enlargement both in the horizontal and vertical directions, thereby enabling image projection
without the need for external enlargement equipment.
The adjusted, enlarged image data can be stored for individual input signals

 Color Matching Function

Corrects the difference in the color reproduction of optical components between multiple
projectors. The proprietary adjustment support software and measurement instrument enables
high-accuracy adjustment to create the best image possible in a short time, and achieves a
high level of color uniformity and reproduction between the images.

Table of Contents

1. System Design of Edge Blending and Cautions

(1) Selection of a screen and lens based on the difference between front and rear projection

systems
(2) Considerations for projector installation
(3) Considerations for the System Design of the Signal Delivery System

2. Edge Blending Adjustment Method

(1) Adjustment of the optical system by using a cross-hatch
(2) Adjustment of edge blending
(3) Adjustment of brightness level for edge blending

3. Color Matching Adjustment Method

(1) Visually operated color matching (3-color and 7-color adjustment)
(2) Color matching adjustment by using a measuring instrument

* For your information:

Edge blending and color matching can be adjusted in any order . However, color matching after
blending makes it difficult to distinguish color difference. In this case, projecting
non-overlapping butt images using the lens-shift function makes the adjustment easier.

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1. System Design of Edge Blending and Cautions

 In order to steadily project a large image or high-definition image using multiple units of

projector without showing an image boundary such as a joint line or change in brightness
and hue, attention should be paid to several points in the selection of proj ectors, screen and
delivery equipment as well as the method of installation.

z Projection scheme for high-definition images with a multi-screen support

system

Projection with a single projector

Lightia Lite

Image source

Expanding the image 2 times in
the horizontal direction with the
digital image enlargement
function

Image source

Multi-screen support system

Color matching function

Distributor

Edge blending function

Lightia Lite

Full use of the pixels of the DMD element of
each projector results in clearer and brighter
images.

Fig.1

(1) Selection of a screen and lens based on the difference between front and rear

projection systems

1) Front projection system

~ The most suitable system for edge blending.
~ Select a zoom lens other than a short-focus fixed lens (ET-D75LE5).

* Points to keep in mind
A short-focus fixed lens does not permit zooming or lens shift and the projector needs to

be placed at the center of each image. The lens causes slight distortion of the projected
image around the lens perimeter and does not permit accurate image overlapping at the
joint part.

~ The screen should be selected from white mattes (screen gain 1.0 or less) with a wide view

angle

* Points to keep in mind
Glass-beaded, pearl-surface or silver-surface screens have high screen gain and a

narrow view angle. When a projected image is viewed from an oblique angle, a difference
in brightness is visible at the joint line.

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2) Rear projection system

~ Edge blending in a rear projection system requires caution when selecting a screen and

lens. Both hard screens and soft screens are available but the one with a wide view angle
(the higher the αH, αV, the better) and low screen gain (GS=1.0 or less) needs to be
selected.

~ When using a hard screen, a Fresnel, lenticular or other lens-processed screen is not

suitable for this purpose and cannot be used for edge blending.

Currently available rear screens do not include one with non-directional reflection such as

a white matte, so a diffusion type screen should be selected.

Example of a rear screen

 When deflection or warping exists in a screen,

accurate overlapping cannot be achieved at
the blended part. A hard screen is, therefore,
recommended unless physical restrictions
prevent the screen from being placed in the
intended location.

 Photo 1 shows the front view of the

edge-blended image consisting of two images
side by side. Due to the high screen gain of

1.6, a hot spot is visible but the blending is
reasonable when viewed from the front.

Photo 1

Photo 2

 Photo 2 is the view from a side angle.

Because the light from the near-side projector
is stronger on the opposite side, the
brightness is not well-blended.

 The following two approaches are effective

ways of improving this phenomenon, but the
problem cannot be solved completely due to
the directional property of the current rear
screen.

(1) Installing projectors far apart from the

screen

(2) Selecting the most appropriate screen

(low gain, wide view-angle type)

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~ When selecting a soft screen, caution is required with regard to image patching.

 When a droop or wrinkle exists on the screen surface at the lapped part of two blended

images, double images are generated and the intended performance cannot be obtained.

* Points to keep in mind
When a soft screen is used for separating the projection room and auditorium, the

screen tends to sag when a door is opened or closed or when there is a change in
atmospheric pressure originating from air-conditioning equipment, thereby causing
double images at the lapped part of the edge-blended images.

Correct setting of air-conditioning (airflow direction, force, ventilation devices) and

suitable door design (door position, sliding door etc) are required.

~ Lens selection
In the majority of rear projection environments, the space is limited and use of a fixed

short-focus lens is unavoidable. However, because of wide incidence angle projected onto
the rear screen, there is a big difference in brightness when viewed from the side.
Therefore the short focus zoom lens (3-chip DLP type: ET-D75LE6, 1-chip DLP type:
ET-DLE100) are recommended.

 Despite its short focus, LE6 enables zooming and lens shift in the up-down and left-right

directions along with a wide range of adjustment such as deviation correction of projector
installation position.

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(2) Considerations for projector installation

1) Positional relationship between projectors and screen

 As shown in the plan view in Fig.2,

projectors need to be installed in
parallel with the screen surface.

 When the installation is not in parallel,

the projected image causes trapezoid
distortion in the horizontal and vertical
directions, and the edge part of the

Install in parallel

Fig.2 (Plan view)

Projector can be
moved within the
range of the lens shift*

Fig.3 (Side view)
* The amount of lens shift varies by projector

model and the actual lens used. The specific
value should be checked with the specification.
For example, use of the full up-down shift
disables the left-right shift.

blended images generates a
white-out or dark shade. The linearity
of the entire image is also
deteriorated.

 The blending width may be

determined freely but a wide band is
recommended for a smooth joint.
10% of the image width is
recommended. After determining the
blending width, each projector is
installed with its lens center aligned
with the screen center.

 The lens always causes distortion.

The distortion is less near the center
of each lens. Distortion of a zoom
lens varies between the telescope
end and wide-angle end. Please
check with the sales personnel for
more details.

 Fig.3 shows a conceptual installation

viewed from the side.

 The projector should be installed with

the lens center aligned with the
center line of the screen.

 In the case of front projection, the

projector is either placed on a table or
suspended from the ceiling
depending on the installation
environment. In either case,
installation is possible within the
range of the lens shift.

 A slant installation that leads to the

range of lens shift being exceeded
requires trapezoidal correction. As
edge blending does not respond to
trapezoidal correction, a slant
installation is not acceptable.

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