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Contents
n D-ILA method
n What is the D-ILA multimedia projector?
n D-ILA features
n D-ILA method present condition and subject
n “Brightness” basics
n D-ILA resolution
n Installation conditions and throw distance
n Throw distance
n Table: Relationship between
screen size and throw distance
n Stacking systems
n Projection type (front projection)
n Projection type (rear projection)
n Installation
n Operating precautions
n System design
Page 3
3
● Compatible with various video signal formats
Computer signals of up to 1280 x 1024 dots and
horizontal sync frequency of 82 kHz can be projected.
Built-in multi-scanning enables one projector to project
not only TV and video signals but also HDTV, personal
computer and workstation signals. The 5:4/4:3/16:9
aspect ratio is automatically switched according to the
projection source. (Manual mode can also be selected
with some models.)
● Flexible installation
Using the powered zoom lens, the screen size and
throw distance can be adjusted to suit the distance and
position of the screen. This versatile lightweight
projector can also be suspended from a ceiling with
the dedicated hanging metal fittings. The left-right and
up-down inversion function allows rear projection (a
rear-projection model with 1:1 wide lens is available).
● Various convenient functions
Wired computerized remote control is possible via the
control connector (RS-232C). 19 picture characteristic
presets are provided, allowing picture characteristics to
be adjusted independently to suit the video source.
(When more than one video source with the same or
similar sync frequency is used, independent adjustment may not be possible.)
Lamps can be replaced by the user, so maintenance is
easy.
•
D-ILA is a trademark of Victor Company of Japan,
Limited.
•
The specifications of the DLA-G20 are shown.
Convenience
D-ILA Method Present Condition and Subject
2
Input signal
Projection lens
Lamp
Screen
PBS
(Polarized Beam Splitter)
D-ILA device
DLA-G20
DLA-S15
multimedia projector lineup
The D-ILA method reflects the light from the lamp and uses it to produce
a picture. Because the light use efficiency is so high, the device can be
called a “light amplifier”.
The D-ILA device is a high-density element with 1365 x 1024 pixels packed
onto a small 0.9" (diagonal, 4:3) chip. Because it is so dense, this device is
able to achieve a high aperture ratio (93%) that ensures that light from the lamp
is utilized at top efficiency.
Gaps between pixels are extraordinarily small, making possible a high aperture
ratio.
Pixel
D-ILA method
What is the
D-ILA multimedia projector?
D-ILA eliminates the trade-off between the high brightness
and high resolution.
The D-ILA multimedia projector is able to project a clear, bright, high-resolution
image onto a large screen. Vivid images can be achieved even in a bright room.
● High-precision projection
The D-ILA device provides high resolution of 1365 x
1024 pixels, enabling S-XGA images to be projected
without compression or loss of quality. Horizontal
resolution of 1000 TV lines (4:3) is achieved and
pictures are clear and sharp, making it ideal for
high-definition TV and personal computer images.
With the ADPC (Adaptive Digital Pixel Conversion)
circuit, resized pictures from various sources can be
reproduced naturally with high picture quality.
● Natural color reproduction
A xenon lamp is used because the color balance of the
light it emits is close to natural light. Ahighperformance color decomposition/composition mechanism is also used to ensure natural color reproduction.
● Excellent gradation reproduction performance
Superior reproduction of dark areas as well as light
areas is essential for top projector performance. The
D-ILA multimedia projector’s high contrast of 350:1
allows it to accurately reproduce all gradations from
light to dark.
High picture quality
● High-brightness projection
The D-ILA device is coupled with a newly developed
520 W xenon lamp to enable powerful light output of
2000 ANSI lumens.
● High-quality large-screen projection
Powerful light output of 2000 ANSI lumens ensures
superb large-screen projection images on the
recommended 300" (diagonal, 4:3) and max 521"
(diagonal, 4:3) screens.
Bright large screen
The “D-ILA method” is a method of picture projection that uses JVC’s original
“D-ILA device”. Based on JVC‘s ILA®projector which has more than a 40% share of
the professional large-screen projector market, the “D-ILA device” offers the same
basic performance in a more compact, lighter, and less expensive design.
The projector incorporating this “D-ILA device” is the “D-ILA multimedia
projector”.
“D-ILA” stands for Direct drive Image Light Amplifier.
Just as an audio amplifier amplifies sound, the D-ILA device amplifies light to
produce a picture.
This technology is applicable not only to front projection, but also such
applications as an engine section for the rear-projection system.
•
The “D-ILA device” was originally developed and is manufactured by JVC.
Page 4
High
resolution
High
brightness
Tradeoff
5
Most video projectors use either the CRT method or the LCD method. However, both methods suffer from having to make
a tradeoff between high brightness and high resolution.
As shown in the figure on the left, the CRT method enlarges and
projects optically the picture projected onto the CRT with the lens.
To increase the brightness, the brightness of the CRTprojection
tube itself has to be increased. However, to increase the
brightness of the image, a large amount of current is required. As
a result, beams are expanded, degrading the resolution.
©
“High brightness” and “high resolution” conflict.
As shown in the figure on the left, the LCD method irradiates the
LCD panel with the lamp and its transmitted light is optically
enlarged and projected. The LCD panel is divided by pixels.
Therefore, to increase the resolution, the number of pixels has to
be increased. However, the result is that the aperture ratio
(transmittivity of the light) is decreased, degrading the brightness.
As there are lines to pass through video signals in the lattice
section, some degree of thickness is required. Also, a pixel
driving transistor is provided at the corner of each pixel.
Consequently, it is structurally impossible to increase the aperture ratio. To compensate for this, a high output light source lamp must be
used. However, the light transmission loss on the LCD panel is converted to heat energy, generating heat and damaging the LCD panel.
As a result, bright lamps must be used with great care.
©
“High brightness” and “high resolution” conflict.
The D-ILA method overcomes the tradeoff between “high
brightness” and “high resolution” by using the construction as
shown in the figure on the left. As you can see, the D-ILAmethod
optically amplifies the video signal with the D-ILA device. The
resolution is determined by the pixel division of the panel. The
D-ILA device integrates 1365 x 1024 dots on an 0.9" (diagonal,
4:3) panel to achieve exceptionally high resolution. In addition,
the pixels are controlled from the C-MOS located at the rear, so it
is not necessary to pass a line through the gap between pixels.
This means there is no restriction on how close the pixels can be,
making it possible to achieve a high aperture ratio of 93% and
produce a clear picture without noticeable cross stripes.
The light emitted from the lamp enters the D-ILA device via the
PBS (Polarized Beam Splitter). As most light is reflected when a
picture is optically amplified, the light is not converted to the heat
on the D-ILA device. So, the D-ILAdevice is not damaged by the
heat in principle.As a result, a high output lamp can be used as a light source, achieving the high brightness.
©
“High brightness” and “high resolution” are not in conflict.
Digital gamma correction
The brightness characteristics of the strong and weak parts of the
drive voltage (video signal) are called “gamma characteristics”.
The straighter this curve, the better the gradation expression,
ensuring more accurate gray scale reproduction.
If “gamma characteristics” are poor, gradations cannot be
expressed accurately, resulting in “flat black” or “white blurring” on
the screen. To improve this, “gamma correction” is carried out.
However, this is difficult if the device itself has an extreme
“gamma characteristic”. Because gamma correction works best
when performed at as low a level as possible so the device’s
“gamma characteristic” should be relatively mild.
The D-ILA device has a mild “gamma characteristic” because
the gradation degree is controlled with the polarized light degree.
In the past, gamma correction was done with analog processing.
With the D-ILA, the signal is digitized and corrected using precise
10 bit processing to ensure accurate gradation reproduction close
to that of CRT.
(With the LCD method, the gamma curve is not linear so
reproduction of gradations in near-white or near-black areas tends
to be difficult.)
How does the D-ILA method avoid the trade off between “high
brightness” and “high resolution”?
D-ILA device
PBS
(Polarized Beam Splitter)
Projection lens
Screen
Lamp
Input signal
Input signal
Projection lens
Screen
CRT
Lamp
Video signal
LCD panel
Projection lens
Screen
D-ILA Method Present Condition and Subject
4
D-ILA features
High resolution
n High-density reflective device (D-ILA device)
1365 x 1024 dots, aspect ratio of 4:3
1280 x 1024 dots, aspect ratio of 5:4, S-XGA full
resolution
High brightness
n High aperture ratio (93%)
n High reflective ratio device (D-ILA device)
n Newly-developed 520 W xenon lamp
1000 ANSI lumens
High contrast
n Continuous use of vertically-aligned liquid crystals
established with the ILA device
More than 250:1
350:1 achieved with the DLA-G20
High picture quality
n 10-bit digital gamma correction
Faithful reproduction of dark and bright parts
Excellent gradation reproduction
n Newly-developed xenon lamp
Faithful color reproduction
Excellent operability
n Ready for various sources:
ADPC (Adaptive Digital Pixel Conversion) circuit for multi
source, optimum pixel density conversion for data,
natural picture and moving picture, and high-speed
digital processing
n Maintenance free:
Maintenance needs only lamp replacement which the
user can perform.
n Portability:
Thanks to the compact, high-density D-ILA device, this
high-performance projector is remarkably small (smallest
in the S-XGA full resolution class) and lightweight
(14 kg), making it extremely portable.
The D-ILA device has been designed to overcome the
trade off between “brightness” and “resolution” that
plagues conventional CRT and LCD projection methods.
With D-ILA, instead of boosting one at the expense of
the other, high resolution can be maintained while the
light output of the main unit itself can be strengthened.
As a result, large-screen projection capability can be
provided. JVC likes to refer to the D-ILA method as “the
third method”.
m CRT method
m LCD method
m The third method D-ILA
D-ILA features
Page 5
7
Conventional projection methods: CRT projection tube
method and LCD (liquid crystal) method. The construction
and features of each method are outlined in Table 1.
The CRT method has been in use for a long time
and the characteristics of its input signals are excellent.
However, the higher the brightness, the larger the beam
diameter, resulting in degraded resolution. At the same
time, heat is produced when beams run into the phosphor
screen. As a result, brightness and resolution are limited,
resulting in an unsatisfactory tradeoff.
The LCD method offers compactness, light weight
and mass-production. However, when the resolution is
increased, the aperture ratio (area rate of effective pixel
section) is lowered, resulting in decreased brightness and
heat generation due to the light and heat conversion in
non-aperture section (ineffective pixel section).
As a result, brightness and resolution are limited,
resulting in an unsatisfactory tradeoff.
Even though both methods have been improved, they are
still subject to a tradeoff between brightness and
resolution. To maximize performance, projectors are often
stacked in multiple configurations.
The ILA projector solves the tradeoff between
brightness and resolution with a new method using a
spatial light amplification device (ILA device).
In order to maintain high performance, while achieving a more compact design JVC developed the D-ILA
method. As shown in Fig. 1, while the conventional ILA
method uses the CRT to write a picture, the D-ILA method
writes video signals directly and electrically to the device.
As a CRT and writing lens are not required, the
body of the projector can be greatly reduced, while still
achieving brightness of 2000 lumens — the highest in the
S-XGA full resolution class.
Outline of each projector method
D-ILA Method Present Condition and Subject
6
D-ILA multimedia projector technical description
D-ILA multimedia projector offers both
high brightness and high resolution.
CRT
LCD
Input signal
Projection lens
CRT
Screen
• Both the maturity degree and compatibility with
conventional systems are high.
• With no pixel construction, this method is easily fit to
various signal forms.
• To enhance the brightness, the amount of beam is
increased, resulting in the lowered resolution and heat
generation.
• With a single panel, this method is easily fit to the mass
production.
• As this is constructed with the pixel unit, the input signal
form is limited.
• The light use efficiency is low.
• To increase the resolution, the aperture ratio is lowered,
resulting in the lowered brightness and heat generation.
Input signal
Lamp
LCD panel
Projection lens
Screen
Methods Basic construction Features
CRT
for writing a picture
Input signal
Input signal
Writing lens
Projection
lens
Light source lamp
Light source lamp
Screen
Screen
PBS
(Polarized Beam Splitter)
ILA device
D-ILA device
Conventional ILA method
Newly-developed D-ILA method
High performance made compact!
Smallest in the S-XGA full resolution class!
PBS
(Polarized Beam Splitter)
Projection
lens
D-ILA method
present condition and subject
In world that is becoming increasingly digital, day by day, a
device capable of projection of high-resolution computer
graphics and digital video is becoming indispensable.
D-ILA is capable of producing a high-resolution, highcontrast, big-screen image far brighter than conventional
projection systems and viewable from a wider angle than
ever.
The conventional direct-view-type display is also
changing to meet the demand for large-screen displays.
However, the size of these displays is limited. As a result,
demand for projectors which enlarge images optically and
reproduce them on a large screen is growing.
m Table 1 Outline of projector methods m Fig.1: Comparison between the ILA method and D-ILA method
The performance characteristics required of a high
picture quality projector are listed below.
1. Large screen for an event hall
2. Higher brightness than in a movie theater
3. High resolution ready for high-definition TV
4. Input signal for multimedia
To satisfy these requirements, we developed the D-ILA
multimedia projector.
D-ILA method present condition and subject
Page 6
9
1399.18
1218.84
987.26
685.60
503.71
385.65
304.71
246.82
203.98
171.40
146.04
125.93
109.70
96.41
85.40
76.18
68.37
61.70
50.99
42.85
39.49
36.51
31.48
27.42
42
45
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
220
240
250
260
280
300
0.85
0.91
1.02
1.22
1.42
1.63
1.83
2.03
2.24
2.44
2.64
2.84
3.05
3.25
3.45
3.66
3.86
4.06
4.47
4.88
5.08
5.28
5.69
6.10
0.64
0.69
0.76
0.91
1.07
1.22
1.37
1.52
1.68
1.83
1.98
2.13
2.29
2.44
2.59
2.74
2.90
3.05
3.35
3.66
3.81
3.96
4.27
4.57
Intensity at-a-glance table (with fine bead screen)
Aspect ratio = 4:3
Screen gain = 2.4
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
339.37
280.47
235.67
100
110
120
2.03
2.24
2.44
1.52
1.68
1.83
Intensity at-a-glance table (with SF-H1102 Fresnel lenticular)
Aspect ratio = 4:3
Screen gain = 3.3
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
1056.9760 1.22 0.91
Intensity table (with SF-L060FJ)
Aspect ratio = 4:3
Screen gain = 3.7
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
400.8770 1.42 1.07
DB-70S10 intensity table
Aspect ratio = 4:3
Screen gain = 1.9
Model
Light output ( )
Screen
size
(model, inches)
DLA-S15
1000
cd / m
2
WidthLength
1085.5360 1.22 0.91
Intensity table (with SF-L060SJ)
Aspect ratio = 4:3
Screen gain = 3.8
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
479.4277.5 1.57 1.18
Intensity table (with SF-L080S)
Aspect ratio = 4:3
Screen gain = 2.8
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
308.52100 2.03 1.52
Intensity table (with SF-L100FJ)
Aspect ratio = 4:3
Screen gain = 3.0
Model
Light output ( )
Screen
size
(model, inches)
DLA-G20
1000
cd / m
2
WidthLength
Even with the
same 1000 lm level,
there is a big difference
in actual brightness.
CRT system
D-ILA
10% peak
(measured by outputting only 10% of the white)
All-white
All-white
1000 200~340
1000 (with DLA-G20)
D-ILA Method Present Condition and Subject
8
Brightness levels can be expressed in various ways (units).
Unit
Light flux
Illuminance
Intensity
Symbol
cd/m
2
nit
ft-L
Reading
Lumen
lux
Candela per
square meter
Nit
Foot-lambert
Description
The light output of a projector itself. A projector’s basic brightness performance is easy to measure.
However, the actual brightness can vary depending on the settings used and other factors. When comparing
brightness performance, these settings should be checked. (eg.: 10% peak, all-white, etc., refer to (2) on the next
page.)
To measure illuminance, the projected screen size (area), as well as the reading, is taken into consideration.
When an area of 1 m
2
is projected with light output of 1 , illuminance is 1 .
Therefore, the smaller the projection area, the larger the value of , even when the value remains the same.
Similarly, the larger the projection area, the smaller the value of .
It is important to know the projection screen size when assessing the value. If the value seems very high, it may
be based on a very small projection screen size.
Intensity is a measure of the amount of light reflected from the screen. This is what people normally experience as
brightness. Intensity is based on the reflectance (gain) of the screen and the illuminance ( ).
Although intensity is a fair reference for brightness, it is important to compare the projector’s brightness performance
carefully. Because screen area and reflectance are added to the calculation, the intensity value can vary widely
according to different conditions.
With light flux of 1
If an area of 1 m2 is illuminated,
illuminance of 1 is obtained.
When the distance is doubled,
the area is quadrupled,
meaning that illuminance is 1/4 .
If the distance is doubled,
but projection size remains the same,
then illuminance also
remains the same (1 ).
Illuminance ( ) =
Light flux ( )
Screen area (m2)
Intensity (cd/m
2
) =
Illuminance ( ) 2 screen reflectance (gain)
(radian)
3.14
ft-L = dc/m2 2 0.292
cd/m
2
= nit = ft-L 2 3.43
(Nowadays, cd/m
2
is more commonly used than nit.)
80
100
120
150
200
300
1.99 m
2
3.09 m
2
4.47 m
2
6.98 m
2
12.38 m
2
27.88 m
2
1.77 m
2
2.76 m
2
3.96 m
2
6.21 m
2
11.03 m
2
24.83 m
2
Model
(inches) (diagonal)
4 : 3
(16:9)
reference
“Brightness” basics
The value of the light flux ( ) showing the projector’s
light output varies depending on incidental conditions.
The “10% peak” value used for many CRT projectors
increases to 3 to 5 times the all-white value.
For example, if a CRT projector has a brightness level of
1000 at 10% peak, the value at all-white will be from
200 to 340 . With the DLA-G20, on the other hand,
the value at all-white is 1000 , making the DLA-G20 3 to
5 times brighter than a CRT projector of the same level.
This shows the importance of taking incidental conditions
into account when comparing light flux ( ) performance.
• If a mirror for folding a light axis is
available, add the reflectance of the
mirror to the calculation according to
the number of mirrors used.
•The intensity of the Japanese
standard theater screen is around
30 to 65 cd/m
2
.
Reference material (1)
Reference material (2)
Brightness levels can be expressed in various ways (units).
Screen brightness is not related to throw distance. It is determined by projection size and screen reflectance (gain) unless
the projection space is smoky or hazy. Even with a long throw distance, the brightness remains the same if the projection
size is set to the same value by changing the lens magnification. The relationship is shown below.
m Relationship among the projector light output, screen area and illuminance
m Formula m The area of a typical screen
•
Catalog data should be compared with the same unit.
“Brightness” basics
Page 7
11
90 95 100
0510
D-ILA Method Present Condition and Subject
10
Projected images can be difficult to see under bright light
because the ambient light lowers the contrast ratio by
illuminating the screen surface. As a result, the screen
(and the image) appears whiter. The contrast ratio is
normally classified as shown below. In each case, the
reflection limit of the external light on the screen surface is
shown as reference. For actual installation, the reflection
amount on the screen should not exceed the values
shown below.
ANSI
The light output (lumen) of a projector cannot be clearly
understood when different measurement methods are
used. When data has been obtained with various
measurement methods under different conditions, it is
difficult to compare actual performance. To ensure a
relatively meaningful basis for comparison, many
manufacturers adhere to measurement standards set forth
by “ANSI” (American National Standard Institute). The
D-ILA is measured according to the ANSI IT 7.228.
ANSI measurement method
Connect a signal generator and project signals at 100%
level (all-white) on the screen.
(1) Project a signal pattern as shown in Fig.1 and adjust
the contrast and brightness so that the difference in
lightness of each block can be recognized clearly. In this
case, the aspect ratio should be the same for the screen
and pattern.
(2) Project the all-white with this contrast and brightness.
Measure the center point in each zone which is obtained
by equally dividing the screen into 9 as shown in Fig.2.
The ANSI value is obtained by averaging the 9 measured
point values. Normally, an illuminance meter is used for
measurement. As the measurement unit is (lux), obtain
the value of (lumen) by calculating with the projected
screen area.
• ANSI is shown autonomously by each manufacturer and
is not required. At present, the measurement method for
light output is not prescribed.
• Even though ANSI indication is shown, a unique measurement method may have been used or conditions (1)
may not be satisfied. Be careful!
• If the fact that the data is obtained according to
“American National Standard IT 7.228” is shown on the
document, the data is correct.classified as shown below.
In each case, the reflection limit of the external light on the
screen surface is shown as reference. For actual installation, the reflection amount on the screen should not
exceed the values shown below.
m Fig. 1 m Fig. 2
Which is brighter, 1000 or 2000 (40" type, 4:3)?
2000 would seem to be brighter. However, the
measurement unit is different. “ ” (lumen) shows the
light output while “ ”(lux) shows the illuminance. These
vary depending on the screen size.
Illuminance ( ) =
Therefore,
the light output ( ) = illuminance ( ) 2 screen area (m
2
).
A 40" screen with 4:3 aspect ratio is
0.5 m
2
, = 2000 x 0.5 = 1000.
Therefore, 1000 and 2000 have the same brightness.
42
45
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
220
240
250
260
280
300
0.85
0.91
1.02
1.22
1.42
1.63
1.83
2.03
2.24
2.44
2.64
2.84
3.05
3.25
3.45
3.66
3.86
4.06
4.47
4.88
5.08
5.28
5.69
6.10
0.64
0.69
0.76
0.91
1.07
1.22
1.37
1.52
1.68
1.83
1.98
2.13
2.29
2.44
2.59
2.74
2.90
3.05
3.35
3.66
3.81
3.96
4.27
4.57
53.70
46.78
37.89
26.31
19.33
14.80
11.69
9.47
7.83
6.58
5.60
4.83
4.21
3.70
3.28
2.92
2.62
2.37
1.96
1.64
1.52
1.40
1.21
1.05
29.29
25.51
20.67
14.35
10.54
8.07
6.38
5.17
4.27
3.59
3.06
2.64
2.30
2.02
1.79
1.59
1.43
1.29
1.07
0.90
0.83
0.76
0.66
0.57
10.98
9.57
7.75
5.38
3.95
3.03
2.39
1.94
1.60
1.35
1.15
0.99
0.86
0.76
0.67
0.60
0.54
0.48
0.40
0.34
0.31
0.29
0.25
0.22
DLA-G20
250
1000
Lux ( )
Reference/DLA-S15
250
1000
Lux ( )
DLA-G20
250
1000
Lux ( )
Reference/DLA-S15
250
1000
Lux ( )
DLA-G20
250
1000
Lux ( )
Reference/DLA-S15
250
1000
Lux ( )
Model
Contrast
Light output ( )
Reference table for the reflection limit of the external light on the screen (aspect ratio = 4:3)
Required contrast ratio 30 : 1 50 : 1 100 : 1
Screen size
(Inches/model)
Width (m)Length (m)
Formula
Calculate with
XL = L –
C
T C
11
XL = Reflection illuminance ( )
L = White illuminance = ( )
C
T = Required contrast ratio
C = Contrast ratio of the projector
Light output ( )
Screen area (m
2
)
Reference material (3) Reference material (4)
Reference material (5)
“Brightness” basics“Brightness” basics
30:1 = The minimum contrast ratio required for a general presentation
50:1 = The minimum contrast ratio required to watch a picture
100: 1 = Contrast ratio acceptable to most people
• Select the contrast ratio according to the usage conditions.
Light output ( )
Screen area (m
2
)
Page 8
n S-XGA resolution = 1280 x 1024 dots
XGA resolution = 1024 x 768 dots
There doesn’t seem to be any noticeable difference.
Actually,
n S-XGA (D-ILA)
1280 x 1024 = 1,310,720
1,310,720 x 3 plates = 3,932,160 dots
n XGA
1024 x 768 = 786,432
786,432 x 3 plates = 2,359,296 dots
3,932,160 ÷ 2,359,296 x 100 =
166.7%
In terms of the total number of dots (or pixels), S-XGA
resolution is 1.7 times that of XGA. The difference in
image precision, smoothness and brilliance can be
clearly seen.
1280
1024
1024
768
13
● The term “S-XGAequivalent” indicates compression and
data loss. Actual resolution is determined by the
capabilities of the LCD panel. The maximum possible
resolution with an LCD-based system is XGA (1024 x 768
dots).
A 1024 x 768-dot LCD panel projects an “S-XGA
equivalent” image, by compressing and attenuating S-XGA
1280 x 1024 signals.
● Compression affects the thickness of the lines that make
up the picture, making the lines less clear. Attenuation
eliminates some lines altogether.
● Because the D-ILA device has an inherent resolution of
1365 x 1024 dots, the D-ILA projector is able to reproduce
S-XGA resolution in full without compression or data loss.
This fact should be emphasized as a key sales point.
D-ILA Method Present Condition and Subject
12
What is the difference between the D-ILA projector’s
“true S-XGA” capability and “S-XGA equivalent” capability
offered by other projectors?
10241024
1024
1280
1365
600
800
1280
1024
768
1280
Fig. 1 Fig. 2 Fig. 3
Making the
resolution
higher
D-ILA resolution
S-XGA is a high-resolution display mode used by personal
computers with resolution of 1280 x 1024 pixels. Because
the D-ILA device features built-in resolution of 1365 x 1024
pixels, it can project an image with full S-XGA resolution
without compression or data loss. This is what we mean
by “true S-XGA”. (Fig. 1)
The term “S-XGA equivalent”, on the other hand,
does not describe a “true” S-XGA picture. Instead, it
refers to projected image that is processed so that it
resembles an S-XGA picture. Since LCDs in most LCD
projectors can reproduce either 800 x 600 (S-VGA) pixels
(Fig. 2) or 1024 x 768 (XGA) pixels (Fig. 3), they are
unable to handle all 1280 x 1024 pixels in an S-XGA
display. Therefore, in order to project S-XGA signals, LCD
projectors must compress or “thin out” the image data.
This means that though the image may appear similar to
an S-XGA image, it is not a true “S-XGA” image, since the
projector is incapable of displaying the full S-XGA
resolution.
Unfortunately, because many people are unaware
of the difference between “true S-XGA” and “S-XGA
equivalent”, they can easily be misled about the true
performance characteristics of a projector.
Resolution is a scale for measuring the precision of the
display. With a personal computer display, resolution is
expressed by the number of dots or pixels used in the
horizontal and vertical directions of the screen. For
example, S-XGA is expressed as 1280 x 1024. The
higher the numeric value, the higher the resolution. And
the higher the resolution, the more precise the picture
projected. If someone says that they do not need such
high resolution, it is usually because their computer does
not have high resolution display capability. However, rapid
advances in personal computer technology will soon result
in S-XGA becoming commonplace. By choosing a
projector with the highest possible resolution, you can
ensure that it won’t be rendered obsolete the next time
you upgrade your computer.
Is high resolution really necessary?
D-ILA multimedia projector (Quick Facts)
Outstanding S-XGA full resolution
There is a big difference between “full S-XGA resolution”
(D-ILA) and “S-XGA equivalent”.
D-ILA resolution
Page 9
The throw distance for a media projector is shown below.
15
D-ILA Method Present Condition and Subject
14
Offset axis Throw distance
Center of the lens
Center of the lens
Lower edge
of the screen
Lower edge
of the screen
When placed on a table
When hanging
from the ceiling
(inverted suspension
from the ceiling)
Screen
Screen
Screen
Installation conditions diagram
Upward off-axis is provided vertically, not horizontally.
• The off-axis is fixed (50%). Compensation for screen keystone distortion is not provided.
• The center axis of the lens is at the lower edge of the projection screen. This position remains unchanged even when zoomed.
• With inverted suspension from the ceiling, the center axis of the lens is at the upper edge of the projection screen.
• The throw distance is from the end of the lens to the screen’s lower edge.
Screen
Throw distance
• The throw distance is from the end of the lens to the screen’s lower edge.
Screen
Throw distance
Screen Screen
Installation conditions diagram
• The off-axis amount is fixed (0%). Compensation for screen keystone distortion is not provided.
Installation conditions
and throw distance
The offset axis is applied to the projection optical axis (50% fixed). Thus, when the
projector is placed horizontally, projection is upward, meaning that the projector does not
interfere with the visibility of the picture even when viewed from behind the projector.
DLA-G20
Offset axis is not added to the projection optical axis. The center axis of the lens is at
the center of the screen horizontally and vertically.
Note: The lens position shifts horizontally by 72 mm from the center of the unit. Keep this in mind during installation
(DLA-G20/DLA-S15).
Notes:
• Be careful when demonstrating because the DLA-S15’s
lens section extrudes 41 mm further than the DLA-G20’s.
• The lens has a small degree of error and, unlike the ILA
series, it is not provided with an electronic screen size
adjustment function. For optimum results with the
DLA-G20, do not use the maximum telescopic or wide
angle values. If this is unavoidable, install the projector on
a movable mechanism so that you can move it slightly to
compensate for error. Similarly, because the DLA-S15 has
a fixed focus lens, a similar mechanism will be required to
allow adjustments to the throw distance.
Warning
● Special equipment is required to install the projector on the
ceiling. For safety, this type of installation should be performed by
a qualified technician, not by the customer.
● For installation, consult your dealer. JVC is not responsible for
any damages or injuries that may result from improper or faulty
installation.
With a ceiling suspension installation, the projector can be
installed horizontally. Stability is assured by the upside-down
reverse function. (The optional EF-G10CJ ceiling suspension
stopper is recommended.)
DLA-S15
DLA-G20
DLA-S15
Installation conditions and throw distance
Page 10
What does the lens projection ratio
“3:1” mean?
Screen width = 1
Throw distance = 3
4:3
16:9
Screen width (m) =
49.21
Inch value (diagonal)
Screen width (m) =
45.18
Inches (diagonal)
60
80
100
120
150
200
250
~ 10
10 ~ 20
20 ~ 30
30 ~ 80
80 ~ 120
120 ~ 200
200 ~ 450
Screen size (model) Number of seats
17
D-ILA Method Present Condition and Subject
16
Throw distance
If you do not have a handy copy of the table, “Relationship between screen size and throw distance”, you can get a rough
estimate using the following method.
Obtaining a rough throw distance
Once you have calculated the screen width (as shown on the previous page), you can obtain a rough estimate of the throw
distance.
Rough throw distance = screen width 2 lens value
Obtaining the rough throw distance
n Precondition
Screen size: 100" (4:3)
DLA-G20: Zoom lens projection ratio 2:1 to 3:1
n Calculation
Screen width = 2.03 x 2 = 4.96 (m), 2.30 x 3 = 6.09 (m)
This calculation shows that a throw distance of between
4.06 and 6.09 m is required to project an image on a 100"
(4:3) screen with the DLA-G20.
Keep in mind that the value obtained with this formula is
approximate.
• Do not use the value without making allowance for error.
• Use this value as a guide when first discussing what
screen size should be selected.
• If you need the correct value, refer to the table,
“Relationship between screen size and throw distance” on
pages 18 to 21.
Calculation example
To determine the appropriate screen size, refer to the table
below. The approximate relationship between screen size
and number of seats is based on data from existing
installations.
• Since the DLA-G20 is provided with a zoom lens, there is
more flexibility with regards to installation position.
However, the throw distance must also be taken into
consideration when choosing the installation position;
otherwise, the required picture size may not projected.
Selecting the screen size
Since the DLA-G20 incorporates a zoom lens, throw distance and projection screen size can be adjusted. Indications
marked on the projection lens (such as 3:1) represent the “projection ratio”, that is, “throw distance: screen width”. When
the screen width is “1”, the throw distance is ”3”.
Projection ratio of the projection lens
When the projector screen size is shown in inches (diagonally) and the screen width is unknown, use the following formula.
Using this formula, the inch value (diagonally) can be calculated.
Obtaining the screen width
Throw distance
Page 11
19
D-ILA Method Present Condition and Subject
18
Table: Relationship between
screen size and throw distance
42
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
0.85
1.02
1.22
1.42
1.63
1.83
2.03
2.24
2.44
2.64
2.84
3.05
3.25
3.45
3.66
3.86
4.06
4.27
4.47
4.67
4.88
5.08
5.28
5.49
5.69
0.64
0.76
0.91
1.07
1.22
1.37
1.52
1.68
1.83
1.98
2.13
2.29
2.44
2.59
2.74
2.90
3.05
3.20
3.35
3.51
3.66
3.81
3.96
4.11
4.27
—
—
—
2.8
3.2
3.6
3.9
4.3
4.7
5.1
5.5
5.9
6.2
6.6
7.0
7.4
7.8
8.2
8.5
8.9
9.3
9.7
10.1
10.4
10.8
2.5
2.9
3.5
4.1
4.7
5.2
5.8
6.4
7.0
7.5
8.1
8.7
9.3
9.8
10.4
11.0
11.6
12.2
12.7
13.3
13.9
14.5
15.0
15.6
16.2
To obtain the throw distance from the projection size (projection ratio: 2:1 to 3:1)
Projection size Throw distance (m)
Model
(inches) (diagonal)
Length (m) Wide (2:1) Tele (3:1)Width (m)
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
521
5.89
6.10
6.30
6.50
6.71
6.91
7.11
7.32
7.52
7.72
7.92
8.13
8.33
8.53
8.74
8.94
9.14
9.35
9.55
9.75
9.96
10.16
10.36
10.57
10.59
4.42
4.57
4.72
4.88
5.03
5.18
5.33
5.49
5.64
5.79
5.94
6.10
6.25
6.40
6.55
6.71
6.86
7.01
7.16
7.32
7.47
7.62
7.77
7.92
7.94
11.2
11.6
12.0
12.4
12.7
13.1
13.5
13.9
14.3
14.6
15.0
15.4
15.8
16.2
16.5
16.9
17.3
17.7
18.1
18.5
18.8
19.2
19.6
19.93
20.0
16.8
17.4
17.9
18.5
19.1
19.7
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Projection size Throw distance (m)
Model
(inches) (diagonal)
Length (m) Wide (2:1) Tele (3:1)Width (m)
Use the table below as a guide.
• Because the lens generates a slight error, do not use the maximum settings.
DLA-G20
4:3
To obtain the projection size from the throw distance (projection ratio: 2:1 to 3:1)
2.5
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
63
76
102
128
154
180
207
233
259
285
310
338
364
390
416
443
469
495
521
1.28
1.54
2.07
2.60
3.13
3.66
4.21
4.73
5.26
5.79
6.30
6.87
7.40
7.92
8.45
9.00
9.53
10.06
10.59
0.96
1.16
1.55
1.95
2.35
2.74
3.15
3.55
3.95
4.34
4.72
5.15
5.55
5.94
6.34
6.75
7.15
7.54
7.94
42
51
68
86
103
120
138
155
172
190
207
224
242
260
276
294
311
328
345
0.85
1.04
1.38
1.75
2.09
2.44
2.80
3.15
3.50
3.86
4.21
4.55
4.92
5.28
5.61
5.97
6.32
6.66
7.01
0.64
0.78
1.04
1.31
1.57
1.83
2.10
2.36
2.62
2.90
3.15
3.41
3.69
3.96
4.21
4.48
4.74
5.00
5.26
Projection size
Throw distance (m)
Model
(inches) (diagonal)
Length (m)
Wide (2:1) Tele (3:1)
Width (m)
Model
(inches) (diagonal)
Length (m)Width (m)
Use the table below as a guide.
• Because the lens generates a slight error, do not use the maximum settings.
DLA-G20
4:3
Table: Relationship between screen size and throw distance
Page 12
Screen upper edge
Screen lower edge
Stacking by suspending
from the ceiling (DLA-M4000 x 2)
Stacking on the floor (DLA-M4000 x 2)
2120
Stacking systems
To obtain the throw distance from the
projection size (projection ratio: 1:1)
To obtain the projection size from the
throw distance (projection ratio: 1:1)
Projection size
Length
(m)
Throw distance
(m) (1:1)
Width
(m)
Model
(inches) (diagonal)
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
0.81
1.02
1.22
1.42
1.63
1.83
2.03
2.24
2.44
2.64
2.84
3.05
3.25
3.45
3.66
3.86
4.06
0.61
0.76
0.91
1.07
1.22
1.37
1.52
1.68
1.83
1.98
2.13
2.29
2.44
2.59
2.74
2.90
3.05
0.76
0.96
1.16
1.36
1.56
1.76
1.97
2.17
2.37
2.57
2.77
2.97
3.18
3.38
3.58
3.78
3.98
0.76
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
4.00
40.0
52.0
64.5
77.0
89.5
101.4
114.0
126.5
139.0
151.4
163.5
176.0
188.5
201.0
0.81
1.06
1.31
1.56
1.82
2.06
2.32
2.57
2.82
3.08
3.32
3.58
3.83
4.08
0.61
0.79
0.98
1.17
1.36
1.55
1.74
1.93
2.12
2.31
2.49
2.68
2.87
3.06
Projection size
Throw distance
(m) (1:1)
Length
(m)
Width
(m)
Model
(inches) (diagonal)
Use the table below as a guide.
• For the maximum projection size, use a 200-type (4:3) depending on the lens performance.
• As the throw distance and projection size are only accurate to within ±5%, a throw distance adjustment mechanism is
required on the installation platform.
DLA-S15
4:3
Table: Relationship between screen size and throw distance
When high-intensity projection capabilities are required,
two DLA-M4000s can be stacked in a vertical or horizontal
configuration.
In a vertical stacking configuration, the DLAM4000s are stacked one above the other. Using the
power-driven lens shift function, the two projection images
can be superimposed to obtain an image with double the
standard brightness.
In a horizontal stacking configuration, the DLAM4000s are placed side by side. The two projection
images are superimposed using the mechanical lens shift
function.
Note:
• As the two projection images are superimposed,
registration differences appear in the center and
peripheral areas of the screen due to the lens distortion.
Use the center portion of the optical lens to minimize the
registration difference. This difference cannot be
eliminated because it is caused by lens distortion. The
smaller the lens magnification, the less the distortion.
Vertical stacking limit range:
The DLA-M4000s can be stacked within the area from the screen
upper edge to the lower edge.
Note:
• The data in this table is based on the assumption that two DLA-M4000s are stacked vertically.
When the offset axis of unit Ais X% and that of unit B is Y%, X is obtained with Y= 50 to 10 in the formula
Y1X = 368/H x 100 (provided that the vertical offset axis of the DLA-M4000 is 0 to 50%).
1. DLA-M4000 stacking system
65
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
1321
1423
1626
1829
2032
2235
2438
2642
2845
3048
3751
3454
3657
3861
4064
4270
4470
4670
4880
5080
991
1067
1219
1372
1524
1676
1829
1981
2134
2286
2438
2591
2743
2896
3048
3200
3350
3510
3660
3810
1970
2130
2440
2760
3080
3390
3710
4030
4340
4660
4980
5290
5610
5930
6240
6560
6880
7200
7510
7830
37.13
34.49
30.19
26.82
25.15
21.96
20.12
18.58
17.24
16.1
15.1
14.2
13.42
12.71
12.07
11.5
10.98
10.48
10.05
9.66
12.87
15.51
19.81
23.18
24.85
28.04
29.88
31.42
32.76
33.9
34.9
35.8
36.58
37.29
37.93
38.5
39.02
39.52
39.95
40.34
7.87
10.51
14.81
18.18
19.85
23.04
24.88
26.42
27.76
28.9
29.9
30.8
31.58
32.29
32.93
33.5
34.02
34.52
34.95
35.34
2.78
5.51
9.81
13.18
14.85
18.04
19.88
21.42
22.76
23.9
24.9
25.8
26.58
27.29
27.93
28.5
29.02
29.52
29.95
30.34
0.51
4.81
8.18
9.85
13.04
14.88
16.42
17.76
18.9
19.9
20.8
21.58
22.29
22.93
23.5
24.09
24.52
24.95
25.34
3.18
4.85
8.04
9.88
11.42
12.76
13.9
14.9
15.8
16.58
17.29
17.93
18.5
19.09
19.52
19.95
20.34
3.04
4.88
6.42
7.76
8.9
9.9
10.8
11.58
12.29
12.93
13.5
14.09
14.52
14.95
15.34
1.42
2.76
3.9
4.9
5.8
6.58
7.29
7.93
8.5
9.09
9.52
9.95
10.34
0.8
1.58
2.29
2.93
3.5
4.09
4.52
4.95
5.34 0.34
Screen size
(4:3)
Width Height
Throw
distance
(368/H)*100
Y=50 Y45= Y=40 Y=35 Y=30XY=25 Y=20 Y=15 Y=10
m D-ILA-M4000 stack shift table
Page 13
23
D-ILA Method Present Condition and Subject
22
The basic setup for a horizontal stack configuration is shown below.
Screen size (4:3)
80
90
100
110
120
130
140
150
160
170
180
190
200
Width
1626
1829
2032
2235
2438
2642
2845
3048
3751
3454
3657
3861
4064
Height
1219
1372
1524
1676
1829
1981
2134
2286
2438
2591
2743
2896
3048
1540.1
1747.47
1954.85
2162.23
2369.6
2576.97
2784.34
2991.71
3199.08
3406.44
3613.81
3821.17
4028.54
Lens top point
80
85
90
95
100
105
110
115
120
125
230
135
140
145
150
155
160
165
170
175
180
185
190
195
20
250
300
350
400
450
1626
1727
1829
1931
2032
2134
2235
2337
2438
2540
2642
2743
2845
2946
3048
3150
3751
3353
3454
3556
3657
3759
3861
3962
4064
5080
6096
7112
8128
9144
1219
1295
1372
1449
1524
1600
1676
1753
1829
1905
1981
2057
2134
2210
2286
2362
2438
2515
2591
2667
2743
2819
2896
2972
3048
3810
4572
5334
6096
6858
2368
2520
2672
2825
2976
3129
3281
3433
3585
3738
3890
4042
4194
4347
4499
25.15
23.67
22.34
21.16
20.12
19.16
18.29
17.49
16.76
16.09
15.48
14.90
14.37
13.87
13.41
13.00
12.57
12.20
11.83
11.50
11.18
10.88
10.59
10.32
10.06
8.05
6.71
5.75
5.03
4.47
24.85
26.33
27.66
28.84
29.88
30.84
31.71
32.51
33.24
33.91
34.52
35.01
35.63
36.13
36.59
37
37.43
37.8
38.17
38.5
38.82
39.12
39.41
39.68
39.94
41.95
43.29
44.25
44.97
46.53
25.85
27.33
28.66
29.84
30.88
31.84
32.71
33.51
34.24
34.91
35.52
36.10
36.63
37.13
37.59
38.00
38.43
38.8
39.17
39.50
39.82
40.12
40.41
40.68
40.94
42.95
44.29
45.25
45.97
47.53
26.85
28.33
29.66
30.84
31.88
32.84
33.71
34.51
35.24
35.91
36.52
37.10
37.63
38.13
38.59
39.00
39.43
39.80
40.17
40.50
40.82
41.12
41.41
41.68
41.94
43.95
45.29
46.25
46.97
48.53
27.85
29.33
30.66
31.84
32.88
33.84
34.71
35.51
36.24
36.91
37.52
38.10
38.63
39.13
39.59
40.00
40.43
40.80
41.17
41.50
41.82
42.12
42.41
42.68
42.94
44.95
46.29
47.25
47.97
49.53
28.85
30.33
31.66
32.84
33.88
34.84
35.71
36.51
37.24
37.91
38.52
39.10
39.63
40.13
40.59
41.00
41.43
41.80
42.17
42.50
42.82
43.12
43.41
43.68
43.94
45.95
47.29
48.25
48.97
50.53
29.85
31.33
32.66
33.84
34.88
35.84
36.71
37.51
38.24
38.91
39.52
40.10
40.63
41.13
41.59
42.00
42.43
42.8
43.17
43.5
43.82
44.12
44.41
44.68
44.94
46.95
48.26
49.25
49.97
51.53
Screen size
(4:3)
Width Height
Y=50 Y=51 Y=52 Y=53XY=54 Y=55
Throw
distance
(306.6/H)*100
Screen upper edge
Screen lower edge
Horizontal stacking (DLA-M4000 x 2)
Leave a space of more than 340 mm
Screen upper edge
Screen lower edge
Stacking by suspending
from the ceiling (DLA-M15 x 2)
Stacking on the floor (DLA-M15 x 2)
Important:
• Depending on the screen characteristics, different viewing angles can produce variations in illumination and color tone.
Be sure to take this into consideration when selecting the screen. Consult your JVC dealer for more information
regarding screen selection. The type of screen you use is especially important if you are using rear projection.
m D-ILA-M4000 1:1 lens throw distance table
If you need a compact, high-intensity projection system,
you can stack two DLA-M15s in a vertical configuration.
When two DLA-M15s are stacked on a dedicated
stacking platform and the two projection images are
superimposed with the manual lens shift function, doubled
brightness can be obtained. Available dedicated stacking
platforms include a ceiling type and floor type.
Note:
As the two projection images are superimposed,
registration differences appear in the center and peripheral
areas of the screen due to the lens distortion. Use the
center portion of the optical lens to minimize the
registration difference. This difference cannot be
eliminated because it is caused by lens distortion. The
smaller the lens magnification, the less the distortion.
m D-ILA-M15 stack shift table
2. DLA-M15 stacking system
Note:
• This table is based on the assumption that two DLA-M15s are stacked on a stacking table.
When the offset axis of unit Ais X% and that of unit B is Y%, X is obtained with Y= 50 to 55 in the formula
Y1X = 306.6/H x 100 (provided that the offset axis of the DLA-M15 is 30 to 55%).
Stacking systemsStacking systems
Vertical stacking limit range:
The DLA-M4000s can be stacked within the area from the screen
upper edge to the lower edge.
Page 14
25
D-ILA Method Present Condition and Subject
24
Projection type (front projection)
Front projection
When it comes to determining the final picture quality of a
large-screen projection system, the quality of the screen
itself is often ignored. This is a mistake. Like the
speakers in an audio system, screen quality is essential in
determining the final result. Just as poor speakers will
result in poor sound, no matter how good the rest of the
audio system, so too will poor screen quality affect the
quality of the projected image. Although the D-ILA
multimedia projector’s superior performance
characteristics enable it to achieve a high-quality picture
with any screen, choosing a high-quality screen with
characteristics suitable for the viewing environment will
assure optimum results. The information below will help
you select the most appropriate screen.
Screen type
Type
White
Pearl
Silver
Polarized
light
Beads
Reflectivity
Reflectivity
Reflectivity
Reflectivity
Recurrence
1
1.3 ~ 2.0
3 ~ 4
2 ~ 3
2 ~ 3
Ultra wide
Wide
Narrow
Middle
Middle
Recurrence
Standard
gain (Gs)
Picture
quality
Visual field Characteristics
Recurrence is the same as the lens effect of beads. The gain is high but the angle of visibility is
relatively narrow. Ghosts appear due to a stray light phenomenon. Focus is not sharp and
gradation is not smooth, resulting in soft picture quality. Recently, an excellent screen that
eliminates these weak points has become available.
Using the characteristics of polarizing film, this reduces the effect of reflected external light. The
high contrast ratio can easily be maintained even in bright surroundings, making this type suitable
for projection in situations where it is desirable to leave the lights on.
Care should be taken when using a polarized light screen because it is necessary to match the
polarized light projected from the projector with the characteristics of the screen.
The screen surface is silver and the gain is extremely high, allowing pictures to be viewed in
relatively bright rooms. The field of view is limited, restricting the audience position. This type is
not suitable for large audiences.
Hot spots are common and a curved screen is required. Picture quality is relatively low. This
type is suitable for special business applications (3D projection using a polarized light).
The screen surface is glossy pearl and the angle of visibility is around 30˚ for the left and right
(60˚ total). The picture quality is dynamic and beautiful. The gradation of black and color
reproduction are excellent and extremely high picture quality is obtained. Until recently, pearl
screens were the screen of choice when picture quality was a priority. Recently, however, a new
type of screen — beads screen — has been developed that offers comparable picture quality.
The screen surface is white and there is almost no gain. As the angle of visibility is close to the
full diffusion of 180˚, this type is ideal for auditoriums and rooms with a theater-style layout since
the audience expands sideways as the distance from the screen increases. The benefit of a
white screen is more natural color reproduction if the room is dark or if the light output of the
projector is sufficient.
There are five basic types of front projection screen. General characteristics are shown below.
• The optimum screen differs depending on the situation. When selecting a screen, be sure to consider the advantages
and disadvantages of each screen type.
Front projection systems project light directly onto a
screen. The reflected light appears as an image on the
screen. Typically, the projector is installed on a table or
suspended from the ceiling.
When external light is reflected on the screen, the
image contrast is lowered. As a result, it is common
practice to lower the lighting level during projection.
Thanks to the D-ILA multimedia projector’s powerful light
output, however, projection is possible even in a relatively
bright environment. (Nevertheless, even with the D-ILA
projector, the less the external light reflection, the better
the image quality.) (Refer to the table on page 10.)
Stacking system
Horizontal side-by-side placement of two DLA-M4000s is a
basic requirement for a DLA-M4000 multi-system. Two
DLA-M4000s are arranged horizontally and project images
directly on the white screen. What is most essential for
the multi system is the brightness on the screen and
difference in color tone. According to our research so far,
two horizontally placed DLA-M4000s can obtain the actual
use level as a multi system. In rear projection
configurations, screen characteristics are especially
important.
As shown in the photo, both the brightness and
tone reach the usage level. As a shading adjustment
function for dark sections (not provided with the DLAG10/G15/G20 ) has been added to the DLA-M4000,
brightness can be adjusted to less than 10 with Eab at
each point.
Reference: The performance of up to 3 horizontally
arranged units is ensured.
3. DLA-M4000 multi-system (side by side)
As with the DLA-M4000 multi-system, two horizontally
placed DLA-G15s are required. With this system, the
screen characteristics are also very important. In
particular, different viewing angles can produce variations
in illumination and color tone depending on the screen
characteristics. The DLA-G15 is affected by
manufacturing characteristics (optical characteristics,
especially D-ILA shading characteristics) because it is a
general projector. Check the characteristics before
shipping when selecting a projector for a multi-system.
<Reference for selection>
Compare R, G, and B shading adjustment data using the
PSA controller.
• Check that the dynamic shading adjustment data is
within 22% of unadjusted data.
• Make sure that each color has the same level.
4. DLA-G15 multi system (2 units put side by side)
Page 15
27
Angle of visibility
60˚
0
1.0
2.0
50˚ 40˚ 30˚ 20˚ 10˚ 0˚ 10˚ 20˚ 30˚ 40˚ 50˚ 60˚
Beads screen
White screen
Pearl screen
(Left) (Right)
Fine screen
Fine beads screen
Angle of visibility Screen gain
0˚
5˚
0˚
15˚
18.5˚
(Angle a)
20˚
25˚
30˚
35˚
38.0˚
(Angle b)
40˚
45˚
2.40
2.21
1.91
1.50
1.20
1.11
0.94
0.86
0.82
0.80
0.79
0.77
26
Q.
Is the fine beads screen the same as the beads type?
If so, since the beads type has a sharp gain, does the
screen seem darker to viewers at the edge of the visibility
angle?
A.
As you can see the gain chart shown below, the absolute
value indicates that the fine beads screen is brighter at
most angles and the gain is higher even at the edges than
any other screen type except for the white screen. All
viewers will see a very bright picture, but since peak is
sharp, the screen will be darker for people on the edges
than for those in the middle.
To show the angle of visibility, there is a scale called
the half gain angle (angle a). Depending on the case, the
half gain angle of the fine beads screen may be narrower.
However, the absolute value for the gain at all angles is
higher in many cases. Therefore, it is risky to select a
screen on the basis of its angle of visibility alone. We
recommend comparing screens with the gain chart.
With the fine beads screen, beads with a diameter
almost half that of conventional beads (70 µm) are
embedded in a high density layout. This eliminates stray
light and ringing phenomena, achieving an excellent
picture with clear color reproduction and high contrast.
When brightness or picture quality is important, it is better
to choose the fine beads screen.
• The screen gain charts except for the Fine Screen Pro are shown as a guide.
m Screen gain chart
FINE SCREEN PRO
Fine beads screen (Quick Facts)
The screen shows an image by reflecting the projected
light. This reflection degree is expressed with the gain
(= Gs). The standard screen gain reference is based on
the white screen which is set to “gain = 1”.
(Strictly speaking, full diffusion (object obtained by burning
magnesium on a aluminum plate) is “gain = 1”. In actual
use, “Kodacolor standard white” is “gain = 1”. Normally,
“gain” means the peak gain. The peak gain is the value at
the point where the gain is the highest. )
The higher the gain, the brighter the screen. On the
other hand, the angle of visibility becomes narrower. Refer
to the typical example showing the relationship between
the gain and angle of visibility shown on the right. In
general, the angle of visibility is shown with the half gain
angle (= angle a: point where the peak gain is halved) and
1/3 gain angle (= angle b).
Screen gain
Reflectivity means that the light reflects in the direction
opposite to the angle of incidence.
Recurrence means that the light reflects in the
same direction as the angle of incidence.
The projector installation position must be changed
depending on the screen type. Position the projector so
that the reflected light is level with the audience’s eyes.
Care should be taken to ensure that seats are not
darkened (within the angle of visibility).
Screen reflectivity and recurrence
A sound screen is designed so that sound from the
speakers behind the screen passes through the screen
through numerous small holes at the regular pitch on the
screen surface.
With the D-ILA device, pixels are regularly arranged.
Therefore, a moiré phenomenon may be produced by
interference from these screen holes. The extent of this
phenomenon depends on the hole diameter, hole
disposition, hole disposition pitch and projection size. As
there is no way to calculate this effect beforehand, be sure
to verify the effect with a test projection.
Note on using a sound screen
Screen gain chart
Screen gain
Angle of visibility
60˚
0
1.0
2.0
50˚ 40˚ 30˚ 20˚ 10˚ 0˚ 10˚ 20˚ 30˚ 40˚ 50˚ 60˚
Beads screen
White screen
Pearl screen
(Left) (Right)
Reflectivity
White, pearl, silver,
polarized light
Recurrence
Beads
(JVC Fine Screen Pro)
Screen
Screen
Incident light
Incident light
Reflected light
Reflected light
Gain = 1 Gain = 2.4
a = 1/2 Peak gain
b = 1/3 Peak gain
b = 38 degree
Audience area
Projection type (front projection)Projection type (front projection)
Page 16
29
With rear projection systems, the transmitted light, rather
than the reflected light, appears on the screen as an
image. This means that the projector must be installed
behind the screen. In principle, rear projection is not
affected by the level of illumination in a room. If the D-ILA
is used as a rear projector, its powerful light output
ensures a clear, easy-to-view picture even in a very
brightly lit room.
(Nevertheless, even with the D-ILA projector, the less the
external light reflection, the better the image quality.)
(Refer to the table on page 10.)
The throw distance is the same as with front projection. In
general, the light axis is folded back with a mirror and the
depth of the back is reduced. To determine the
relationship of the positions of the projector, mirror and
screen, a CAD-based simulation is required.
Rear projection
For rear projection, basically use the DLA-S15 D-ILA multimedia projector.
During rear projection with the DLA-S15, the reference light axis should intersect with the screen (incident angle 0˚)
regardless of the type of the screen.
Hard screens with a cut lens (see below) have a fixed
focus length. It is OK for the lens edge to be at the focus
length position. If the distance is not appropriate, select a
screen which allows the projector to be installed at a
distance that exceeds the screen focus length. If the
screen focus length and throw distance do not match each
other, there will be problems with the picture. These are
especially apparent if the projector is within the screen
focus length; hot spots and color shifts are very noticeable,
resulting in a significant loss of picture quality.
Installation standard
L = Throw distance = Screen focus length
(A) L = Good
(B) L < Bad
Hot spots, color shifts, uneven brightness and blurred focus are
very evident. This setting should be avoided.
(C) L > Reasonably good
This setting is not the best, but better than L< .
(A) Good
(C) Reasonably good(B) Bad
m Installation example
(reflection in the vertical direction)
m Installation example
(reflection in the horizontal direction)
Viewed
from the side
Viewed
from the side
Viewed
from the above
Viewed
from the above
Screen
Screen
Screen
Screen
(Mirror)
(Mirror)
(Mirror)
(Mirror)
Reference
light axis
Reference
light axis
Reference
light axis
Reference
light axis
One mirror
reflection projection
One mirror
reflection projection
One mirror
reflection projection
One mirror
reflection projection
Direct projection
Direct projection
Direct projection
Direct projection
D-ILA Method Present Condition and Subject
28
Projection type (rear projection)
Illuminance light
(all-direction oscillating light
components mixed)
Oscillation in the
horizontal direction
Oscillation in the
vertical direction
Oscillation in the
vertical direction
Oscillation in the
vertical direction
Oscillation
in the vertical
direction
Light from the projector
(Oscillation in the
vertical direction)
External light reflection,
• “horizontally oscillating light” is
shut out with a polarizing film
and does not pass through.
• “vertically oscillating light” is reflected.
©
Only half of the
external light is reflected.
Projector light reflection
• “vertically oscillating light” is reflected.
©
All light is reflected
• Reflection surface
• Polarizing film
(Both are adhered to the product.)
Theoretically, a
polarizing screen
provides the same
effect that would be
obtained by cutting the
external light reflection
in half. In other words,
the polarized screen
can provide the same
contrast as a normal
screen in a room that’s
twice as bright.
• The arrow mark showing the light in the figure on the left does not show
the light oscillating direction. The amount of the reflected light is
generalized.
n Principle of the polarized light screen
Lights used for normal illumination include a component
which oscillates in all directions (360˚) to distribute the
light. The light emitted from the DLA-G20 D-ILA multimedia projector, on the other hand, mainly consists of vertically oscillating light. Ascreen with polarized light characteristics reflects only “vertically oscillating light” and
absorbs “horizontally oscillating light”. JVC polarized light
screens include the SF-L100FJ, SF-L060SJ, and SFL080S.
When the DLA-G20 projects light onto this type of
screen, most of the light is reflected because the light from
the DLA-G20 consists mainly of vertical components.
Since external light, on the other hand, consists of both
horizontal and vertical components, the screen will absorb
up to 50 percent of the external light, reflecting only the
vertical components. As a result, high contrast can be
maintained even in a bright environment.
n Notes on the use of the polarized light screen
1. To obtain the proper effect with the polarized light
screen, the polarized direction of the projector must be the
same as that of the screen. If a projector with a different
polarized direction is used, (for example, a projector that
outputs “horizontally oscillating light”), most of the
projected light will be absorbed on the screen surface and
the picture will not be visible.
For the DLA-G20/15, only the following screens should be
used: SF-L100FJ / SF-L060FJ / SF-L060FSJ / SF-L080S.
If any of these screens are used with another brand of
projector or the DLA-G20/15 is used with another brand of
screen, be sure to check the polarized light screen effect.
2. With a CRT projector or DLP system projector which
does not output a polarized light, a polarized light screen
effect cannot be obtained.
3. Some high-intensity LCD projectors may not be used
with a polarized light screen.
Polarized light screen (Quick Facts)
Projection type (front projection)
Page 17
31
n Mirror
● Ideally, when projecting images using rear projection, a
mirror should not be used. However, if limited depth is
available in the installation location, making it necessary to
fold the light axis, you can use one mirror for reflection. If
you use more than one mirror, consult the Projection Sales
Department beforehand. The more mirrors used, the
worse the picture quality and the lower the brightness.
● Be sure to use only a JVC-specified glass surface
mirror. If an underside mirror or refex mirror is used,
picture quality may be adversely affected.
n There are three basic types of
reflection mirror.
A. Surface mirror (surface aluminum evaporation
glass mirror)
This mirror has a reflection surface on the glass surface.
As there is no unnecessary reflected light, this mirror provides optimal reflection image. However, because the
reflection surface is on the surface, it can easily be damaged. Be sure not to touch this surface with bare hands.
Also, in comparison to other types of mirrors, surface mirrors are expensive and the
maximum available size is relatively small. Nevertheless,
if picture quality is the priority, choose this mirror.
B. Underside mirror (general mirror)
The reflection surface is behind the glass. This is the kind
of mirror normally employed in lavatories since the reflection surface is protected and difficult to damage. Cleaning
is also easier and it is less expensive than a surface mirror. The disadvantage of this type is that light is reflected
not only on the reflection surface but also partially on the
glass surface. As a result, the image is doubled, producing a ghosting effect which makes it unsuitable for reflection of a projector image.
C. Refex mirror (Aluminum evaporation polyester film
mirror)
Although refex mirrors are inexpensive, it is difficult to
maintain surface smoothness, resulting in moiré and fuzzy
images. This type of mirror has not been generally suitable for actual use. However, it has been recently
improved.
● As a result, a surface mirror is recommended for use
as a reflection mirror for rear projection with the D-ILA.
m Difference between surface mirror and underside mirrora
Basic facts about reflecting mirrors
When a projector with divided pixels is combined with a
screen which uses a Fresnel lens, lenticular lens and
black stripe, cross stripes from the divided pixel panel
interfere with the screen’s lens pitch and black striping,
resulting in moiré pattern. The extent to which this pattern
is noticeable depends on the size of the projected image,
the screen’s lens pitch and the panel’s pixel division pitch.
Although the DLA-S15 has divided pixels, it has a
high aperture ratio with very little cross striping, moiré
patterns are not normally apparent. However, care should
be taken when this unit is combined with a Fresnel
lenticuler screen or black stripe screen. If moiré does
appear, there is no way to get rid of it so be sure to check
it beforehand.
Assuming that no moiré patterns appear, the
Fresnel lenticular screen is a good choice since it can
reproduce much better pictures in terms of the peripheral
light quantity ratio, brightness and viewing angle than a
screen that only uses a dispersal agent.
Notes on screens for a transmission type rear projection
The D-ILA’s powerful light output results in heat
generation. As the area available behind the screen is
typically small, temperature can rise excessively. Cool the
area behind the screen by providing good ventilation or by
installing an air conditioner.
(When an external fan is added, take air flow resistance
into consideration and use a fan with relatively large
capacity.)
Notes on screens for a transmission type rear projection
D-ILA Method Present Condition and Subject
30
Mirror
Screen
Adequate
view range
Mirror
Screen
Adequate
view range
m Heating value
m Projector cooling fan capacity
Model
Heating value
DLA-G20 / DLA-S15
2260 kJ/h 540 kcal/h
Model
Fan air capacity
DLA-G20 / DLA-S15
Total 303.6 m
3
/h (5.06 m3/h)
Cost
Performance
Maximum size
Remark
A: Surface mirror
2400 mm 2 1800 mm
Use this type.
B: Underside mirror
3600 mm 2 1500 mm
Not recommended.
C: Refex mirror
600 mm 2 1400 mm
Not recommended.
m Surface mirror (mirror for the DB-70S10) m Underside mirror (general mirror)
Glass Glass
Reflected light
Reflected light
Incident light
Incident light
Reflection metal film Reflection metal film
Unnecessary
reflected light (ghost)
The range of adequate view generally depends on the “viewing angle”. The rear screen for the JVC DB-70S10 data box is
shown as an example. The viewing angle varies depending on the screen. However, as the D-ILAlight output is large, a
fairly large viewing angle can be obtained.
Range of adequate view
Projection type (rear projection) Projection type (rear projection)
Total market (includes mirrors which the Projection Sales Department does not handle)
Page 18
n Role of the lens
Fresnel lens
With the Fresnel lens cut in the form of circles as shown on the upper left, the light axis is directed inward (shown in the
middle and right figures) to prevent loss of brightness at the corners of the screen. This minimizes shadows and ensures
that uniform brightness is obtained throughout the screen area.
Lenticular lens
With a lenticular lens which is cut straight vertically and horizontally as shown in the upper left and middle figures, the
viewing angle is determined (upper right figure) and gain is held on the screen. The vertical lenticular determines the
viewing angle in the horizontal direction and the horizontal lenticular determines the viewing angle in the vertical direction.
33
As discussed in the section on front screens, the screen is an important factor in determining the final quality of the system.
It is necessary to understand the features of the various types of screens.
Rear screens are roughly divided into “hard” and “soft” types. ”Hard” is further classified into several types. The
representative types are shown below.
As of February, 1999 O: Good : Normal 2: Care required
Total market (includes mirrors which the Projection Sales Department does not handle)
Types of rear screen
The cost is relatively low and a bright, high-quality picture can be obtained.
Some shadows may occur.
Large size screens are difficult to transport and deliver.
Color shift is minimized.
Brightness levels are good.
There are joints in the screen.
As the light passes through two screens, resolution tends to be degraded.
Large size screens are difficult to transport and deliver.
Expensive but well suited for large screens.
(Can be broken down for transportation. Joints may be visible.)
As the light passes through two screens, resolution tends to be degraded.
If the throw distance is short, the following phenomena result.
(As the light axis compensation is insufficient, shadows appear.)
At the cross section of the lenticular, scintillation may occur.
Large size screens are difficult to transport and deliver.
This is relatively inexpensive.
Shadows and color shifts may be noticeable.
Contrast is excellent.
Picture is not very bright.
Large size screens are difficult to transport and deliver.
This is relatively inexpensive.
Shadows and color shifts may be noticeable.
Transportation, delivery and construction are easy.
The screen moves with the air flow.
Picture is not very bright.
Soft
Hard
Type
Single Fresnel lenticular
Double Fresnel lenticular
Double cross lenticular
Dispersal agent hard type
Dispersal agent soft type
Maximum size
150 model (4:3)
150 model (4:3)
200 model (4:3)
250 model (16:9)
180 model (16:9)
1000 model (4:3)
Characteristics
Single
Fresnel lenticular
Double
Fresnel lenticular
Single
cross lenticular
Double
cross lenticular
With dispersing agent contained
Hard Soft
Brightness (gain)
Viewing angle
Contrast
Luminance uniformity (shading)
Color uniformity
Color reproduction
Resolution
Scintillation
Hot spot (fire ball)
Flare (blot)
Throw distance
Shock strength
Flatness
Installation difficulty
Change in resolution due to “floating”
Durability against environment
Maintenance
Maximum size (model)
V
V
V
~ V
V
V
V
V
V
~ V
V
V
V
V
V
V
V
150 (4 : 3)
V
V
~ V
V
~ V
V
V
V
V
~ V
V
V
V
V
150 (4 : 3)
~ V
V
V
~ V
V
V
~ V
V
~ V
V
V
V
2
250 (16 : 9)
~ V
V
V
V
V
2
2
~ V
V
V
V
V
V
250 (16 : 9)
2
2
V
V
2
~ V
V
V
V
V
V
V
180 (16 : 9)
2
2
V
V
2
~ V
2
V
V
2
V
1000 (4 : 3)
D-ILA Method Present Condition and Subject
32
Basic facts about rear screens
n Terminology
Single/double: Shows the number of screens to be used to produce one screen
Single: one, double: two
Fresnel: Fresnel lens which is cut in the form of a concentric circuit.
Lenticular: Lens cut straight vertically and horizontally.
Cross lenticular: Lenticular lens cut vertically and horizontally so that cut lines are crossed. Processing is not possible
on the same surface. So, for a single lens, the front and rear sides are cut. For double lens, one
side of each lens is processed.
Dispersal agent: This disperses the light and looks like frosted glass. This is mixed into material or sandwiched
between the screen surfaces.
<Cost>
A single screen can cost several million yen and a double
screen will cost several times more (for the size, refer to
the next page).
A mold is used to manufacture a single screen. Adouble
screen is manufactured by cutting each screen individually.
(Large single screens are also manufactured by cutting, so
they are also expensive.)
<Screen delivery>
As a hard screen cannot be rolled like a soft screen, it is
delivered to the installation location in finished form.
Therefore, it is necessary to ensure a delivery path. If the
delivery path cannot be maintained after a building is
completed, the screen must be delivered during
construction.
Projection type (rear projection) Projection type (rear projection)
Page 19
Possible to move upward in 90˚ max.
Possible to move downward
in 90˚ max.
<Conditions>
Be sure to ensure sufficient space
for intake and exhaust ports
in the same way as for
an ordinary installation.
Do not use the projector by inclining it to the
left and right
(this concerns the installation angle,
not the incident angle).
The projector can
be set upside down
and hung from the
ceiling.
(It is recommended
to use the dedicated
hanging metal fittings “EF-G10CJ”.) If the projector
is set upside down, the intake port faces upward
so be careful of dust.
Do not put
paper or
documents
under the
projector.
This reduces
the clearance
between the
projector and the table, blocking
the intake port and reducing the
cooling effect.
Do not expose your skin
to the hot exhaust.
Excessive exposure can cause burns.
Air intake
Exhaust
359
168
223
408
179
66
15°
15°
φ
11
3 - φ11 long hole
Center of the lensCenter of the pedestal
metal fittings
120163
150
200
240
7°
7°
450
436
79
79
114.5
378
318.5
176
5°
5°
• Specifications and design subject to
change without notice.
• The projector is installed upside down. • Projector is an option.
Dimensions (Unit: mm)
Projector with
EF-G10CJ attached
Specifications
•
The lens of the DLA-G20 is not located at the center. When attaching the metal fittings,
the lens center is shifted from the center of the pedestal metal fittings by 79 mm. Take this
into consideration when determining the installation position.
Ivory coating
±15˚
±5˚
±7˚
(H) 176 x (W) 450 x (D) 359 mm
(6-15/16" x 17-3/4" x 14-3/16")
6.5 kg (14.3 lbs.)
(H) 378 x (W) 450 x (D) 408 mm
(14-15/16" x 17-3/4" x 16-1/8")
20.5 kg (45.2 lbs.)
Finish
Vertical tilt variable range
Horizontal tilt variable range
Horizontal pan variable range
Dimensions
Weight
Dimensions (when the DLA-G20 is incorporated)
Weight (when the DLA-G20 is incorporated)
21
〜
〜
200
Ceiling hole position
when installing the
ceiling hanging
metal fittings
Plane surface
(when the ceiling is viewed
from the floor)
Screen
Throw distance +163
Center of the screen
120
179
Ceiling
Screen installation position
with ceiling-mounted
projector
● Elevation view
318.5
Upper edge
of the picture
Screen
• To lower the screen further, put a cushion
for adjustment between the metal fittings and
the ceiling and lower the projector as well.
• To raise the screen further, a cavity must be created in the
ceiling for the projector installation. If this is not possible,
trapezoid distortion may occur.
20cm
20cm
20cm
20cm
50cm
4.1cm
DLA-G20 / DLA-S15
50cm
Lamp
35
m Fixing the projector to the
metal fittings
Lamps should be replaced regularly based on usage time. If the
projector is fixed to metal fittings, leave enough space (as shown
on the left) for lamp replacement. The ceiling hanging metal
fittings “EF-G10CJ” and data box “DB-70S10” allow the projector
to be moved with the hinge for lamp replacement.
m Ceiling suspension
The DLA-G20 can be set upside down and suspended from a
ceiling. Make sure there is enough space for the intake and
exhaust ports to dissipate heat and to allow easy maintenance
access (attach an elevator to move the projector up and down
easily for maintenance and leave enough space for lamp
replacement).
For installation of special metal fittings, it is necessary to
use the feet of the projector or make an opening for intake port or
lamp replacement. Use the dedicated “EF-G10CJ” ceiling
hanging metal fittings.
m “EF-G10CJ” ceiling hanging
metal fittings
Features:
• Enables the D-ILA multimedia projector “DLA-G20” to be suspended from a ceiling
• Enhances the installation flexibility of the DLA-G20
• Makes pan and tilt angle adjustment easy
• Enables easy assembly and installation
* Please note that the DLA-G20 cannot compensate for trapezoid
distortion.
m Ceiling hole position when installing
the ceiling hanging metal fittings
m Screen installation position with ceiling-mounted projector
m Permanent installation on a table or
shelf
To prevent the projector from falling, tipping over, etc., you may
want to fix it securely to the platform, table or shelf where it is
installed. You can do this with the “EF-G10CJ” ceiling hanging
metal fittings. The table should also be firmly anchored to the
floor.
• In all installations, the supporting platform (ceiling, table, etc.)
must be able to support a total weight of at least 20.5 kg (14 kg
projector and 6.5 kg “EF-G10CJ” ceiling hanging metal fittings).
The weight of these items could result in a serious or fatal injury if
an accident were to occur. Special precautions should be taken
to prevent the projector from falling or being knocked over even
under severe conditions such as an earthquake.
*For details, refer to the
“EF-G10CJ” instruction manual.
• Ensure that stress is not
applied any part of the projector
other than its feet.
• Installation and construction
requires expertise and should
only be performed by a skilled
professional. To ensure safety,
the customer should not do the
construction work on their own.
• JVC will assume no
responsibility for any accidents
related to installation such as
falls.
D-ILA Method Present Condition and Subject
34
m Inclination of the projector
Do not install the projector inclined to the left and right. Otherwise, color unevenness may occur or the lamp life may be shortened.
m Space required for heat radiation and
maintenance
To maintain stable performance of the DLA-G20/DLA-S15 for a
long period, it is necessary to provide sufficient space for heat
radiation and maintenance before installation. Otherwise,
overheating may result in deteriorating performance or damage to
the projector.
The minimum space required is shown above.
m Notes on ambient temperature
• The DLA-G20/DLA-S15 uses a high output lamp to obtain high intensity light. Therefore, it generates a lot of heat (540 kcal/h). Be sure
to install the projector in a well ventilated location or provide some form of air conditioning.
• To enhance the cooling effect and ensure reliable performance, ensure that there is sufficient peripheral space and install an
air-conditioner. Ideally a fixed temperature should be maintained.
• Sudden changes in temperature can cause condensation. If the projector is moved from a cold place to a warm place or the room
temperature rises suddenly, wait at least one hour before turning the power on. Also, ensure that humidity levels are kept low.
• Do not block the ventilation slots or wrap the operating projector with a cloth, etc. Do not install the projector close to other equipment as
this can interfere with air flow and result in rising internal temperature.
m Air intake and exhaust of the
DLA-G20/DLA-S15
The DLA-G20/DLA-S15 uses air to cool itself (as shown in the
figure below). Therefore, do not block the intake and exhaust
ports or place an object near the ports. Since air intake is
performed at the base and only minimum clearance is kept when
the projector is installed, be careful not to reduce the clearance by
inserting paper or other objects beneath the unit.
Reference materials: Temperature and humidity conditions faor the DLA-G20/DLA-S15
Allowable operating temperature/humidity: +5˚ to +35˚/20 to 80%, no condensation
Allowable storage temperature/humidity: -10˚ to +60˚/10 to 90%, no condensation
Notes on the installation (DLA-G20/DLA-S15)
Installation
Table
Anchor
Floor
Installation
Page 20
Place the projector in a position where light is not reflected back
into the lens. (e.g. Tilt the window pane in the projection room.)
Glass (tilted)
Light passing
through the
window
Reflected light
Screw
Lamp cover
Take care not to
damage the pawl.
Screw
Lamp unit
Handle
Lamp unit
Handle
Screw
Lamp cover
Take care not to damage the pawl.
37
1 The D-ILA multimedia projector
takes 40 to 50 seconds to display
images after the power is turned on.
The D-ILA multimedia projector takes 40 to 50 seconds to display
images after the power is turned on. This is not a malfunction.
Images will become clear soon after they start to appear.
Warming up is not necessary.
2 Do not disconnect power
immediately after turning off the D-ILA
multimedia projector.
The [OPERATE] indicator goes out when the projector is turned
off, but the cooling fan keeps running for about 40 seconds
(depending on environmental conditions). Therefore, do not turn
the main power off, pull out the plug, or turn off the circuit breaker
soon after finishing operation. Doing so could damage the lamp
in the projector.
Do not shut off the power during operation, as this could
also damage the lamp. JVC assumes no responsibility for any
damage caused by this action.
3 The D-ILA multimedia projector
takes a few seconds to change image
signals.
The D-ILA multimedia projector adapts to different kinds of
multimedia. When it switches to a different type of image signal,
the projector will take a few seconds to adapt to the new signal.
When the signal changes, the display will be disturbed a bit, but
this is not a malfunction.
4 Maintain the proper relationship
between the projector and the screen.
The relationship between the throw distance and the screen size
and the elevation angle are different for each type of D-ILA
multimedia projector. Check the proper position for your machine
before using.
5 There is no function to correct
keystone distortion.
If the position is not correct as described in <4>, keystone
distortion will occur. The D-ILA multimedia projector does not have
an automatic function to correct this distortion. Adjust the projector’s position relative to the screen to correct the image.
6 Perform maintenance in the
proper amount of space.
The projector needs a certain amount of space for proper
adjustment and maintenance (at minimum, the amount shown on
page 34). Without enough space, maintenance cannot be
properly carried out, which may eventually result in a malfunction.
7 Check the window panes in front of
the projector before projecting images.
Light becomes weaker as it passes though a window pane. It is
recommended to have no more than one pane in front of the
projector in a projection room. (No pane is preferable.)
Moreover, part of the light coming from the projector will be
reflected off the surface of the panes. Be sure to position the
projector to prevent light from reflecting back into the lens.
The D-ILA projector is a precision instrument. Be sure to operate it carefully,
according to the points listed below.
D-ILA Method Present Condition and Subject
36
The light source lamp must be replaced periodically. As a rough
guideline, the lamp should be replaced after about 1000 hours of
operation.
When the lamp’s operation time surpasses 900 hours, the
LAMP indicator on the projector lights. When projection starts,
the [lamp replacement] message is shown on the screen for
about 2 minutes. Use a new light source lamp or prepare a light
source lamp for replacement. When 1000 hours have passed,
the LAMP indictor blinks and the light source lamp will not light
even if the [OPERATE] button (or [POWER] button on the remote
control unit) is pressed.
Although lamp replacement timing is normally about 1000
hours, it can vary depending on the operating conditions. If
projection images are dark and the colors are abnormal, replace
the light source lamp earlier. To purchase a light source lamp
(DLA-20-LAMP), consult your JVC dealer.
m Replacing the light source lamp (DLA-G20/DLA-S15)
Notes:
• If the projector is installed in a tight space where it is difficult to
work on, move it to a place where there is more space to work
to avoid injury.
• Use a genuine light source lamp. Problems may occur if you
do not use an approved lamp. Do not use a used light source
lamp. This will result in a reduction of performance and, if the
lamp is damaged, could cause the projector to malfunction.
• Do not replace the light source lamp immediately after using
the projector as the lamp will be too hot to touch. Wait at least
one hour for the lamp to cool.
• When replacing the light source lamp, be sure to turn the main
power off and unplug the power cord from the AC outlet.
Otherwise, an injury or electric shock may result.
• Do not dispose of used lamps as is because doing so is very
dangerous. The lamp contains gas that is sealed in under very
high pressure. Before disposing of the lamp, be sure to remove
the gas.
For more information on disposing of a used lamp, refer to the
instructions provided with the lamp. If you have any questions,
consult your JVC dealer.
Operating precautions
Note: Do not touch the glass surface of the light source lamp with
bare hands or allow it to get dirty. This can shorten the lamp life
and result in poor performance (pictures may appear darker).
Hold the plastic section of a new light source lamp. Do not touch
the metal section or front glass section.
Notes:
• Place the lamp unit in position and close the lamp cover correctly. If the lamp is not properly installed or the cover is not closed
correctly, the safety switch comes on, preventing operation.
• If the pawl on the lamp cover is damaged, the projector may not
work. In this case, replace the lamp cover with a new one.
• When the lamp is replaced, be sure to reset the lamp usage
time. For resetting, refer to the instruction manual.
When the projector is
positioned upward
(downward)
When the projector is
positioned to the left
(right)
When the projector is
incorrectly positioned
in both directions
Installation
1 Loosen the screw and remove the
lamp cover.
Loosen the two screws.
2 Loosen the screw on the lamp unit
and pull the handle to remove the lamp
unit.
Loosen the two screws.
3 Insert a new lamp unit to the inner
part and secure the screw.
Loosen the two screws.
4 Install the lamp cover and secure the
screw.
Loosen the two screws.
Page 21
9.42 m. Actually, unless the distance is 70% of maximum
distance (about 7 m), this person cannot judge one dot with ease.
Thus, the proper viewing distance is about 7 meters. Estimate
the picture at this distance. This distance is about 2.55 times the
vertical length of the screen. Therefore, if the screen size is
different, use the value as a guide obtained by multiplying the
screen vertical length by 2.55. For 16:9 aspect ratio, multiply the
screen vertical length by 3.4.
• The dots that you see near the screen are the D-ILAdevice‘s
pixels and not abnormalities.
18 Fan noise
The D-ILA multimedia projector uses a high-output xenon lamp
and generates heat. Because a fan is used to keep the projector
cool, fan noise is produced. To attenuate this noise, various
measures are taken as shown below. However, when muting or
absorbing the noise, take care not to prevent heat dissipation.
19 Fan performance
Several fans are installed to cool the D-ILA multimedia projector.
These fans have a total capacity of 303.6 m3/h (5.06 m3/min.)
(DLA-G20/DLA-S15).
20 Burning
As with TVs and other display, burning occurs when a high
contrast still picture is projected continuously.
• The D-ILAdevice incorporated in the D-ILA multimedia projector
may cause burning.
• Once burning occurs, replace the part.
• When a 16:9 picture with the top and bottom sections cut is
projected on a 4:3 screen for a long time and the picture source is
switched to 4:3, the boundary line of the 16:9 screen (burning)
may appear.
21 Control from the switcher
The D-ILA multimedia projector can be controlled from a switcher,
controller or personal computer via the RS-232C interface. For
“RS-232C control specifications”, consult your JVC dealer.
45dB
46dB
49dB 44dB
Ceiling : 45dB
1m 1m
1m
1m
• Model:
DLA-G20 /DLA-S15
• Level (Distance of 1 m,
A weighting, average):
46dB
39
16 Changing the aspect ratio
The D-ILA multimedia projector can handle aspect ratios of 5:4,
4:3, and 16:9. Each projection method is shown below. Aspect
ratio is switched automatically according to the type of input
source. For NTSC and HDTV, 4:3 and 16:9 can be switched
manually to assure compatibility with the DVD squeeze mode and
4:3 HDTV presenter camera.
17 Picture estimation
on a large screen
To estimate a picture projected on the screen, the picture is
usually viewed near the screen.If the picture is viewed at a
distance of 40 to 50 cm from a 180-inch screen, the picture
quality is the same as when viewing an 18-inch CRT monitor at a
distance of 4 to 5 cm. That is, the picture on the 18-inch monitor
is viewed with a 10x loupe. This is not a correct estimation
method.
Suppose that a person with standard eyesight of 1.0 is
estimating 1000 vertical dots with resolution of 1000 TV lines. As
the vertical length of the 180-inch (4:3) screen is 2.74 m
(2,740 mm), the length of one dot is 2.74 mm. The maximum
distance with which this person can dissolve 2.74 mm is about
D-ILA Method Present Condition and Subject
38
8 In dark areas
9 The projector’s surroundings
The D-ILA multimedia projector generates heat, so adjust the
temperature in the room with ventilation or air-conditioning,
referring to the table below for the energy generated by each type
of projector. For optimum cooling efficiency and maintenance,
refer to “Installation” on pages 34 to 35.
When the projector is transferred from a cold to warm place,
or the room temperature drastically increases, it may cause
condensation to form that will negatively affect the projector. To
avoid or remove condensation, wait for more than an hour, then
turn the projector on. In
addition, avoid humid environments, as it will also cause
condensation to form. (Keep
the humidity as low as possible.)
10 Do not block the ventilation
openings.
Do not cover the projector with a cloth during operation in order to
avoid increasing the temperature in the projector, and do not place
the projector near other equipment. It may disturb the flow of air
and cause an increase in temperature. Small spaces may also
hinder maintenance. Before you place the projector, refer to
“Installation” on page 34 to 35.
11 The light source lamp must be
replaced periodically.
It is recommended to replace the lamp periodically to maintain a
clear picture. The lamp is mounted in a detachable housing for
easy replacement. For more information, consult your JVC dealer.
• Life of the light source lamp: about 1,000 hours
• Model No.: DLA-G10-LAMP
• Please note that lamp life is a guideline only, and is not a
guarantee.
12 When should the lamp be
replaced?
The light source lamp in the D-ILA multimedia projector will
gradually become exhausted as it is used, with the brightness
lessening over time. The lamp should be replaced when its
brightness becomes about half that of a new lamp.
Do not turn the projector on and off frequently. It will
exhaust the lamp faster and shorten its life.
13 Lamp expiration warning
An orange “LAMP” indicator lights when the lamp is within 100
hours of expiring, so you know when it is time to replace it. An
indication is also displayed on the screen for a few seconds after
the projector is turned on. The orange indicator starts blinking
when the expiration date gets closer. The projector has a timer
with which you can confirm the number of hours the lamp has
been used.
14 No forced shutdown when the
lamp reaches its expiration date during
projection.
It can be considered a selling point for our product, as many of
the other companies’ projectors automatically shut down when the
lamp’s expiration date is reached. Once the projector is turned
off, however, it cannot be turned on again, so do not turn the
projector off during an important meeting. To avoid any problems,
keep a spare lamp handy as soon as the orange indicator lights.
(You can cope with sudden lamp requirements by keeping spare
lamps on a shelf.)
If the lamp does not light, replace the lamp after the
projector is turned off and the plug is pulled out. Before replacing
the lamp, wait for a while until it has cooled down, in order to
avoid any injuries caused by touching the hot lamp just after
turning it off. For more details about lamp replacement, refer to
the instruction manuals of the projector and spare lamp.
15 The lamp automatically turns off
after a certain period of time passes
without any sync signals.
If the projector does not detect any incoming sync signals for a
specified period of time, the sleep function automatically turns it
off. This function avoids unnecessary lamp exhaustion and also
saves electricity, even in situations where you may have forgotten
to turn the projector off.
You can easily set the amount of time from the remote controller.
The screen may become slightly
brighter than the surrounding dark
area, even though the projector is
not projecting images (when muting
or not receiving signals).
The border of the screen may
become slightly brighter than the
surrounding dark area.
(When projecting a window, etc.).
The brighter areas will not stand out while the projector is projecting images.
3
4
4
4
3
4
4
4
5
3
16
9
9
9
3
3
16
16
5:4 projection
4:3 is standard.
By contracting the left and right sides,
5:4 can be obtained (e.g.: S-XGA).
16:9 projection
4:3 is standard.
By contracting the top and bottom sides,
16:9 can be obtained (e.g.: HDTV).
For the 16:9 screen
It is not possible to obtain a 4:3 picture
by contracting the left and right sides.
With 4:3, view the
picture at a distance
of 2.55 times the
screen height.
Screen
With 16:9, view the
picture at a distance
of 3.4 times the
screen height.
Heating value
DLA-G20 / DLA-S15
2260 kJ/h
540 kcal/h
Operating precautions Operating precautions
Page 22
40
System design
m Note on setting up a D-ILA-based system
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
7642241
9222287
7642482
19202517
6402400
6402350
6402480
6402480
6402480
8002600
8002600
8322624
10242768
10242768
10242768
11522870
128021024
128021024
136021024
525
625
525
1125
440
449
525
525
500
628
666
667
806
808
804
915
1066
1066
15.73
15.63
31.47
33.75
24.83
31.47
31.47
35.00
37.50
37.88
48.08
49.73
48.36
56.50
60.24
68.65
63.98
70.80
80.00
59.94
50.00
59.94
60.00
56.43
70.09
59.94
66.67
75.00
60.32
72.19
74.55
60.00
70.10
74.93
75.03
60.02
67.00
75.10
I
NI
I
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NI
NTSC
PAL/SECAM
EDTV
HDTV
PC-98
VGA1
VGA3
Mac13"
VGA VESA
S-VGA1
S-VGA2
Mac16"
XGA1
XGA2
Mac19"
Mac21"
S-XGA1
S-XGA2
S-XGA3 MacBoard
Area No. Source
Number of pixels
(dots)
Scanning lines
Horizontal scanning
frequency (kHz)
Vertical scanning
frequency (Hz)
I/NI
Connector form
Mini D-sub 15 pins
R.G.B.H.V. BNC
BNC
Mini DIN 4-pin/RCA pin
Corresponding area No.
4 ~ 18
0 ~ 18
0 ~ 3
0 ~ 1
Connector names
Computer 1
Computer 2
Y,P
B,PR
S video/composite
H/Cs
P
B/B
-
Y
P
R/R
-
Y
COMPUTER IN-1
AUDIO
COMPUTER IN-2
AUDIO AUDIO
PC
R
G
B
L
R
Y
V
CONTROL
COMPUTER
OUT
REMOTE AUDIO OUT
RS-232C
Y/C
VIDEO
• The following 19 areas are preset for the DLA-G20 and DLA-S15.
• When video signals are input, the area corresponding to them is
selected and locked.
• When input signals do not match in terms of the frequency, etc.,
the closest area is selected and locked.
In this case, since screen shift occurs, it is necessary to fine adjust
the phase, tracking and horizontal and vertical positions. These
can be adjusted automatically by pressing the [Quick Alignment]
button to activate the auto setup function.
* If auto adjustment is not satisfactory, use the manual adjustment
function.
* Even though signals can be input because they are in the
allowable frequency range, images may not be projected normally
with some types of signals.
• Each time the input is switched, the D-ILA multimedia projector accesses the corresponding area.
Therefore, switching takes time and the image is distorted. This is not a malfunction.
• To project a normal image, it may be necessary to adjust video output on the personal computer.
• A separate dedicated cable may be required for connection to a personal computer. Depending on the model, a conversion cable and
conversion adapter may be required.
• The areaa that each input connector covers is shown below. Check with this table if the required video source can be accepted to the
selected connector.
* For example, even if HDTV signals are input to the Computer 1 mini D-sub 15-pin connector, normal images cannot be obtained as
shown in the table .
• The photo shows the DLA-G20 and DLA-S15.
The input and output connectors of the DLA series (excluding the DLA-M4000) are shown below.
Y/C separation: Mini DIN 4 pins (S connector) x 1
Composite: BNC connector x 1
Color difference: Y, PB/B-Y, PR/R-Y (BNC 3-axis) x 1
Serial: RS-232C mini D-sub 9 pins x 1
Analog RGB:
Mini D-sub 15 pins x 1
R, G, B, H, V (BNC 5-axis) x 1
Personal computer
system
Video system
External control
m Input connector table
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