Jvc Dla-g20 User manual

Printed inJapan

XXX-0000

Contents

nD-ILA method

nWhat is the D-ILA multimedia projector?

nD-ILA features

nD-ILA method present condition and subject

n“Brightness” basics

nD-ILA resolution

nInstallation conditions and throw distance

nThrow distance

nTable: Relationship between

screen size and throw distance

nStacking systems

nProjection type (front projection)

nProjection type (rear projection)

nInstallation

nOperating precautions

nSystem design

● 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 adjust-

ment 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

Input signal

Projection lens

Lamp Screen

PBS

(Polarized Beam Splitter)

D-ILAdevice

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. A high-

performance color decomposition/composition mecha-

nism 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.

High

resolution

High

brightness Tradeoff

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 CRT projection

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-ILA method

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-ILA device 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-ILAdevice 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

D-ILA features

High resolution

nHigh-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

nHigh aperture ratio (93%)

nHigh reflective ratio device (D-ILA device)

nNewly-developed 520 W xenon lamp

1000 ANSI lumens

High contrast

nContinuous 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

n10-bit digital gamma correction

Faithful reproduction of dark and bright parts

Excellent gradation reproduction

nNewly-developed xenon lamp

Faithful color reproduction

Excellent operability

nReady 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

nMaintenance free:

Maintenance needs only lamp replacement which the

user can perform.

nPortability:

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”.

mCRT method

mLCD method

mThe third method D-ILA

D-ILA features

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 achiev-

ing 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-ILAmethod

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

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

Writing lens Projection

lens

Light source lamp

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, high-

contrast, 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.

mTable 1 Outline of projector methods mFig.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

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

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 / m2

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 / m2

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 / m2

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 / m2

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 / m2

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 / m2

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 / m2

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

Brightness levels can be expressed in various ways (units).

Unit

Light flux

Illuminance

Intensity

Symbol

cd/m2

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 m2is 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 m2is 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/m2)=

Illuminance ( )

screen reflectance (gain)

(radian) 3.14

ft-L = dc/m220.292

cd/m2= nit = ft-L 23.43

(Nowadays, cd/m2is more commonly used than nit.)

100

120

150

200

300

1.99 m2

3.09 m2

4.47 m2

6.98 m2

12.38 m2

27.88 m2

1.77 m2

2.76 m2

3.96 m2

6.21 m2

11.03 m2

24.83 m2

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/m2.

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.

mRelationship among the projector light output, screen area and illuminance

mFormula mThe area of a typical screen

•

Catalog data should be compared with the same unit.

“Brightness” basics

90 95 100

0510

D-ILA Method Present Condition and Subject

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 meas-

urement 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 installa-

tion, the reflection amount on the screen should not

exceed the values shown below.

mFig. 1 mFig. 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 ( ) 2screen area (m2).

A 40" screen with 4:3 aspect ratio is

0.5 m2, = 2000 x 0.5 = 1000.

Therefore, 1000 and 2000 have the same brightness.

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 –

CTC

11 XL= Reflection illuminance ( )

L = White illuminance = ( )

CT= Required contrast ratio

C = Contrast ratio of the projector

Light output ( )

Screen area (m2)

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 (m2)

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

768

●The term “S-XGA equivalent” 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

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

The throw distance for a media projector is shown below.

D-ILA Method Present Condition and Subject

Offset axis Throw distance

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

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

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)

100

120

150

200

250

~ 10

10 ~ 20

20 ~ 30

30 ~ 80

80 ~ 120

120 ~ 200

200 ~ 450

Screen size (model) Number of seats

D-ILA Method Present Condition and Subject

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 2lens 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

D-ILA Method Present Condition and Subject

Table: Relationship between

screen size and throw distance

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

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

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

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)

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 DLA-

M4000s 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 DLA-

M4000s 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 A is 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

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=30

Y=25 Y=20 Y=15 Y=10

mD-ILA-M4000 stack shift table

D-ILA Method Present Condition and Subject

The basic setup for a horizontal stack configuration is shown below.

Screen size (4:3)

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

100

105

110

115

120

125

230

135

140

145

150

155

160

165

170

175

180

185

190

195

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

37.43

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=53

XY=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.

mD-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.

mD-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 A is 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.

D-ILA Method Present Condition and Subject

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

Recurrence

1.3 ~ 2.0

3 ~ 4

2 ~ 3

Ultra wide

Wide

Narrow

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 DLA-

G10/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.

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)

Angle of visibility

60˚

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

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?

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.

mScreen 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˚

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)

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.

This setting is not the best, but better than L< .

(A) Good (C) Reasonably good(B) Bad

mInstallation example

(reflection in the vertical direction) mInstallation example

(reflection in the horizontal direction)

Viewed

from the side Viewed

from the side

Viewed

from the above Viewed

from the above

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

D-ILA Method Present Condition and Subject

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.

external light is reflected.

Projector light reflection

•“vertically oscillating 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.

nPrinciple 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 multime-

dia projector, on the other hand, mainly consists of verti-

cally oscillating light. A screen with polarized light charac-

teristics reflects only “vertically oscillating light” and

absorbs “horizontally oscillating light”. JVC polarized light

screens include the SF-L100FJ, SF-L060SJ, and SF-

L080S.

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.

nNotes 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)

nMirror

● 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.

nThere 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 pro-

vides optimal reflection image. However, because the

reflection surface is on the surface, it can easily be dam-

aged. Be sure not to touch this surface with bare hands.

Also, in comparison to other types of mirrors, surface mir-

rors 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 reflec-

tion surface is protected and difficult to damage. Cleaning

is also easier and it is less expensive than a surface mir-

ror. 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, produc-

ing a ghosting effect which makes it unsuitable for reflec-

tion 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 suit-

able 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.

mDifference 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

Mirror

Screen

Adequate

view range

Mirror Screen

Adequate

view range

mHeating value

mProjector 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 m3/h (5.06 m3/h)

Cost

Performance

Maximum size

Remark

A: Surface mirror

2400 mm 21800 mm

Use this type.

B: Underside mirror

3600 mm 21500 mm

Not recommended.

C: Refex mirror

600 mm 21400 mm

Not recommended.

mSurface mirror (mirror for the DB-70S10) mUnderside mirror (general mirror)

Glass Glass

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-ILA light 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)

nRole 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.

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)

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

150 (4 : 3)

~ V

150 (4 : 3)

~ V

250 (16 : 9)

~ V

250 (16 : 9)

~ V

180 (16 : 9)

~ V

1000 (4 : 3)

D-ILA Method Present Condition and Subject

Basic facts about rear screens

nTerminology

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. A double

screen is manufactured by cutting each screen individually.

(Large single screens are also manufactured by cutting, so

they are also expensive.)

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)

Possible to move upward in 90˚ max.

Possible to move downward

in 90˚ max.

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°

φ11 3 - φ11 long hole

Center of the lensCenter of the pedestal

metal fittings

120163

150

200

240

7°

450

436

114.5

378

318.5176

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)

〜

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 50cm

4.1cm

DLA-G20 / DLA-S15

50cm

Lamp

mFixing 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.

mCeiling 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 sus-

pended 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.

mCeiling hole position when installing

the ceiling hanging metal fittings

mScreen installation position with ceil-

ing-mounted projector

mPermanent 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

mInclination 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.

mSpace 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.

mNotes 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.

mAir 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

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.

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 projec-

tor’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

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.

mReplacing 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 correct-

ly. 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.

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