Christie Dlv1920 Dx User Manual

							Appendix A: Glossary  
A-4 020-100001-01 Rev. 01 (04/07) 
A physical connection route for a source signal, described by a two-digit number 
representing 1) its switcher/projector location and 2) its slot in the switcher/projector. 
Signal sent from a source device to the projector. 
A device, such as the Serial Digital Input Module, that accepts an input signal for 
display by the projector. 
A method used by video tape players and some computers to double the vertical 
resolution without increasing the horizontal line rate. If the resulting frame/field rate is 
too low, the image may flicker depending on the image content. 
A small push-button device for controlling most projector settings and operation. For 
more information, refer to 3.3, Using the Keypad. 
A distortion of the image that occurs when the top and bottom borders of the image 
are unequal in length. Side borders both slant in or out, producing a “keyhole” shaped 
image. It is caused when the screen and lens surface are not parallel, or (in “X” 
models) by poor Keystone adjustment. 
As the lamp ages, the shape of two anodes may changes from two points to a flattened 
state. When this occurs, the arc jumps across the gap from varying points. This is seen 
as image flicker. Turning the Lamp Conditioning feature ON will pulse the lamp and 
gradually “condition” the two anodes back to two points. Lamp Conditioning may 
take seconds, minutes or hours to reach full effectiveness. NOTE: Lamp flicker can 
occur at any time in the lamps life.  The length of time, over which flicker may occur 
varies considerably and unpredictably. This behavior is inherent in UHP lamps. 
The reproduction of the horizontal and vertical size of characters and/or shapes over 
the entire screen. 
When light from a projector is incident on a screen, the light reflects from the screen 
such that the angle of reflection equals the angle of incidence. The Line of Best 
Viewing is along the line of reflection. 
A Christie software feature where samples of output light from a projector trigger 
automatic adjustments in the lamp ballast power in order to maintain a constant light 
output over time. Also known as brightness tracking. 
The method of feeding a series of high impedance inputs from a single video source 
with a coaxial transmission line in such a manner that the line is terminated with its 
characteristic impedance at the last input on the line. 
The unit of measure for the amount of visible light emitted by a light source. 
The signal representing the measurable intensity (comparable to brightness) of an 
electronic image when the image is represented as separate chrominance and 
luminance. Luminance also expresses the light intensity of a diffuse source as a 
function of its area; measured in lumens or candles per square foot (one lumen per 
square foot = one footlambert). SMPTE RP 98 calls for a luminance of 12 to 22 
footlamberts for theatre screens. See: Footlambert. 
The amount of visible light per square meter incident on a surface. 
one lux = one lumen/square meter = 0.093 foot-candles   Input f 
 In
put Signal f 
 Interface f 
 Interlace f 
 Ke
ypad f 
 Ke
ystone f 
 Lam
p Flicker f 
 Linearit
y f 
  Line of Best Viewin
g f 
 LiteLOC
™   f 
 Loopthrough f 
 (Loo
pthru) 
 Lumen f 
 Luminance f 
 Lux f  
						

							 Appendix A: Glossary 
020-100001-01 Rev. 01 (04/07) A-5 
A list of selectable options displayed on the screen. 
A video output format of some video tape and disk players. There are two types of 
NTSC (National Television Standards Committee) video: NTSC 3.58 and NTSC 4.43. 
NTSC 3.58 is used primarily in North America and Japan. NTSC 4.43 is less 
commonly used. 
A type of rear-projection screen which re-directs light through the screen to increase 
image brightness in front of the screen. Screen gain is usually greater than 1 but 
audience viewing angles are reduced.  
PAL (Phase Alternating Line) video is a 50 Hz standard with 768 x 576 resolution. It 
is found on some video tape and disk players (used primarily in Europe, China and 
some South American and African countries). 
The smallest discernible element of data from a computer-generated image. 
The phase of the pixel-sampling clock relative to incoming data. 
The frequency of the pixel-sampling clock, indicated by the number of pixels per line. 
The projector is at presentation level when an image from a source is displayed 
without the presence of a slide bar, menu, pull-down list, or error message.  
The distance between the projector’s front feet centers and the screen. Also called 
“Throw Distance”. 
The type of code format called “A” or “B” utilized by the remote keypad(s). The 
default protocol set at manufacture is Protocol “A”. By using two different keypad 
protocols, adjacent projectors can be controlled independently with their remote IR 
keypads. 
A selectable menu item that unfolds into a list of options pertaining to it. 
A manufacturer of a digital video recorder/player/server, QuBit, frequently used for 
providing digital cinema data. QuVis image compression uses a proprietary 
technology called Quality Priority Encoding, based on wavelets, in which the user 
selects a quality level based on signal-to-noise ratio. The data rate varies to efficiently 
maintain that quality level. Frames are coded individually. 
A translucent panel for screen projection. Incident light travels through the incident 
surface of a rear screen and forms an image on the other surface. 
The ability to manipulate through software commands the physical size, placement 
and/or aspect ratio of an image. 
The maximum number of alternate white and black horizontal lines that can be 
distinguished on a screen when a photographic target is placed between the lens and a 
light source and illuminated by that source. 
The maximum number of pixels that the projector can display horizontally and 
vertically across an image, such as 1024 x 768 (called XGA).   Menu f 
 NTSC Video f 
 O
ptical Screen f 
 PAL Video f 
 Pixel f 
 Pixel Phase f 
 Pixel Trackin
g f 
 Presentation Level f 
 Pro
jector-to-Screen f 
 Protocol f 
 Pull-down List f 
 QuVis f 
 Rear Screen f 
 Resizin
g f 
 Resolution (lens) f 
 Resolution (
projector) f  
						

							Appendix A: Glossary  
A-6 020-100001-01 Rev. 01 (04/07) 
The minimum time required for a CRT projector to move the position of the scanning 
spot from the right edge to the left edge. 
The time required by the video amplifier of the projector to increase its output from 
10% to 90% of the maximum value. 
The video output (analog or digital) of most computers. Analog RGB video can have 
three, four, or five wires — one each for red, green, and blue, and either none, one or 
two for sync. For three-wire RGB, the green wire usually provides sync. (See TTL 
Video). 
A common asynchronous data transmission standard recommended by the Electronics 
Industries Association (EIA). Also called serial communication. 
A less common asynchronous data transmission standard in which balanced 
differential voltage is specified. RS-422 is especially suited to long distances. 
The output from certain video tape players and video equipment. S-Video separates 
sync and luminance from color information, typically producing a higher quality 
display than composite video. 
The horizontal or vertical frequency at which images are generated. Also known as 
scan rate or refresh rate. 
One horizontal line on the display. 
The horizontal or vertical frequency at which images are generated. 
A video output format of some video tape and disk players (used primarily in France). 
SECAM (Sequential Couleur á Mémoire) signals are similar in resolution and 
frequency to PAL signals. The primary difference between the two standards is in the 
way color information is encoded. 
A slide bar is a graphical display of an adjustable setting. The numerical setting often 
represents a percentage but can be a specific unit such as degrees Kelvin. 
The device, such as a computer or VCR, connected to the projector for display. A 
source may have numerous corresponding channels defined and recognized by the 
projector. See Input. 
See Channel. 
A signal selector that can be connected to a projector for the purpose of adding more 
sources. 
This term refers to the part of the video signal that is used to stabilize the picture. 
Sync can occur in three forms: 
1) “Composite sync”:  the horizontal and vertical components are together on one 
cable. 
2) “Sync-on-green”:  the sync is part of the green video. 
3) “Separate sync” or “H.SYNC and V.SYNC”:  the horizontal and vertical 
components of the sync are on two separate cables.   Retrace Time f 
 (Horizontal) 
 Rise Time f 
 RGB Video f 
 RS-232 f 
 RS-422 f 
 S-Video f 
 Scan Fre
quency f 
 Scan Line f 
 Scan Rate f 
 SECAM f 
 Slide ba
r f 
 Source f 
 Source Setu
p f 
 Switche
r f 
 S
ync f  
						

							 Appendix A: Glossary 
020-100001-01 Rev. 01 (04/07) A-7 
The duration of each sync pulse generated by a computer. The sync width is part of 
the blanking time. 
A type of RGB video with digital characteristics. 
A wire connecting a single video source to a display device, such as a projector, must 
be terminated by a resistance (usually 75Σ for video). 
The distance between the front feet of the projector and the screen. Also called 
“Projector-to-Screen Distance”. Always use the correct Christie throw distance 
formula to calculate the proper throw distance (±5%) required for your lens. 
Throw ratio = throw distance / screen width. Typically used to differentiate lenses. 
Balance of red-to-green necessary for realistic representation of NTSC signals. 
The ability of a projector to synchronize to inputs with frequencies within a specified 
range. 
The frequency at which images are generated. Vertical frequencies vary amongst 
sources. Also called vertical scan rate. 
The difference between the center of the projected image and the center of the 
projector lens. For clarity, offset is often expressed as the maximum amount of the 
image that can be projected above or below the lens center without degrading the 
image quality. Vertical offset ranges depend on the type of lens in use, and whether or 
not the image is offset horizontally at the same time. 
The signal that is used by display devices (such as projectors) to generate an image. 
This term also refers to the output of video tape/disk players and computers. 
An optional device that converts NTSC 3.58, NTSC 4.4, PAL, PAL-N, PAL-M or 
SECAM to RGB video. 
A specific type of video signal, such as NTSC, PAL, SECAM. This projector can 
automatically recognize and interpret the incoming standard and display accordingly. 
Screens do not reflect equally in all directions. Most light is reflected in a conical 
volume centered around the “line of best viewing”. Maximum brightness is perceived 
if you are within the viewing cone defined by the horizontal and vertical viewing 
angles. 
The color temperature of white used by the projector. 
The area of an image that is white only. For example, a full white field is an image 
that is white everywhere. A 10% white field is a white area (usually rectangular) that 
occupies 10% of the image; the remaining 90% is black. 
A high-end digital component video signal. 
A high-end analog component video signal. Sometimes called YUV, Component, or 
Y, R-Y, B-Y, the YPbPr signal by-passes the video decoder in this projector. 
See YPbPr. 
The adjustment of image size by means of a zoom lens.   Sync Width f 
 TTL Video f 
 Terminated f 
 Throw Distance f 
 Throw Ratio f 
 Tint f 
 Variable Scan f 
 Vertical Fre
quency f 
 Vertical Offset f 
 Video f 
 Video Decode
r f 
 Video Standard f 
 Viewin
g Angle f 
 White Balance f 
 White Field f 
 YcbC
r f 
 YPbP
r f 
 YU
V f 
 Zoom f  
						

							Appendix B 
Keypad Reference 
 
020-100001-01 Rev. 01 (04/07)  B-1 
NOTE: The IR remote is a standard component provided with the projector. Use the 
extension cable also provided to convert the IR remote to a wired remote, if desired.  
Refer to Section 3 for a specific description of each key and how to use them 
correctly. 
 
* Toggle keys, which require you to either, press and hold, or press twice or press and 
use the up/down arrow key.  
						

							Appendix C 
Serial Communication 
Cables 
 
020-100001-01 Rev. 01 (04/07) C-1 
A serial link of RS232 or RS422 enables ASCII communication with the projector so 
that it can be controlled remotely from a PC or other controller. From a PC, connect a 
standard nine-wire RS232 serial cable to the 
RS232 IN port. Or, for long-distance 
(>100 ft.) links with an RS422-compatible PC or controller, connect RS422 cable to 
the 
RS422 port. 
 
 
 
  
						

							Appendix D 
Throw Distance 
 
020-100001-01 Rev. 01 (04/07) D-1 
Calculating Throw Distance 
It is important throw distance be 
precisely calculated for your 
installation using the appropriate 
formula from the chart below. To 
calculate throw distance you must 
know the screen size and the lens 
type installed in the projector. In 
general, the larger you want the 
image to be the greater the distance 
you must allow between the lens and 
the screen. 
NOTES: 1) Throw distance is measured from the screen to the center of the 
projector’s front feet. 2) This measurement is not necessarily parallel to the floor as 
the projector and screen may be inclined. 3) Due to lens manufacturing, throw 
distance calculations have a tolerance of 
± 5%. 
Table A-1 Throw Distance Formulas 
Screen Diagonal Inches (cm) Screen Width Inches (cm) Lens Throw Ratio Throw Distance Formula Inches (cm) 
Min. Max. Min. Max. 0.73 SX+ 
0.762 x screen width + 2.65 (6.73) 73.75 (187.3)  215 (543.1)  59.1 (150)  172 (437) 
1.2:1 (short throw) SX+ 
1.2865 x screen width + 3.94 (10.01) 59 (149.86)  147.5 (374.65)  47.2 (120)  118 (300) 
1.2:1 (long throw) SX+ 
1.2521 x screen width + 4.259 (10.818) 147.5 (374.65)  737.5 (1873.25)  118 (300)  590 (1499) 
1.45-1.8 SX+ 
Min. 1.4789 x screen width – 1.42 (3.607) 
Max.  1.8655 x screen width – 3.23 (8.204) 78.75 (199.39) 
62.5 (158.75) 542.5 (1377.95) 
437.5 (1111.25) 63 (160) 
50 (127) 434 (1103) 
350 (889) 
1.8-2.5 SX+ 
Min. 2.0424 x screen width – 29.19 (74.143) 
Max. 2.6076 x screen width – 6.55 (16.637) 78.75 (200.02) 
57.5 (146.05) 546.25 (1387.5) 
393.75 (1000.1) 63(161) 
46 (116) 437 (1111) 
315 (800) 
2.5-4.5 SX+ 
Min. 2.6347 x screen width – 4.50 (11.43) 
Max. 4.783 x screen width – 11.65 (29.591) 120 (304.8) 
67.5 (171.45) 550 (1397) 
546.25 (1387.5) 96 (244) 
54 (136) 440 (1120) 
437 (1111) 
4.5-7.3 SX+ 
Min. 4.5126 x screen width – 2.58 (6.553) 
Max. 7.423 x screen width – 9.92 (25.197) 131.25 (333.38) 
81.25 (206.38) 546.25 (1387.5) 
538.75 (1368.4) 105 (267) 
65 (164) 437 (1111) 
431 (1096) 
0.67 HD 
0.7058 x screen width + 2.23 (5.664) 73.75 (187.3)  215 (543.1)  59 (150)  172 (438) 
1.1:1 FP HD 
1.194 x screen width + 2.67 (6.782) 59 (149.86)  147.5 (374.65)  47.2 (120)  118 (300) 
1.1:1 RP HD 
1.1447 x screen width + 3.76 (9.550) 147.5 (374.65)  737.5 (1873.25)  118 (300)  590 (1500) 
1.38 – 1.84 HD 
Min. 1.3834 x screen width + 1.79 (4.547) 
Max. 1.8835 x screen width + 1.44 (3.658) 78.75 (199.39) 
62.5 (158.75) 542.5 (1377.95) 
437.5 (1111.25) 63 (159) 
50 (127) 434 (1103) 
350 (889) 
1.84 – 2.58 HD 
Min. 1.8971 x screen width – 3.95 (10.033) 
Max. 2.5974 x screen width – 3.64 (9.246) 78.75 (200.02) 
57.5 (146.05) 546.25 (1387.5) 
393.75 (1000.1) 63 (161) 
46 (116) 437 (1111) 
315 (800) 
2.58 – 4.15 HD 
Min. 2.4591 x screen width +11.33 (28.778) 
Max. 4.112 x screen width + 9.0389 (22.962) 120 (304.8) 
67.5 (171.45) 550 (1397) 
546.25 (1387.5) 96 (244) 
54 (136) 440 (1120) 
437 (1111) 
4.15 – 6.74 HD 
Min. 4.0813 x screen width + 10.664 (27.0256) 
Max. 6.8869 x screen width + 10.695 (27.178) 131.25 (333.38) 
81.25 (206.38) 546.25 (1387.5) 
538.75 (1368.4) 105 (267) 
65 (164) 437 (1111) 
431 (1096) 
NOTES: Calculations are not shown for 1.2:1 lenses. TD = projector distance from the screen to the center of the projector’s front feet W = 
screen (image) width.