Epson Projector Emp Tw20 User Guide

							49
Appendix
Glossary
Following is an explanation of some of the terms used in this guide which may be unfamiliar or which 
were not explained in the manual itself. Further information can be obtained by referring to other 
commercially-available publications.
Aspect
The ratio between an images length and its height. HDTV 
images have an aspect of 16:9 and appear elongated. The 
aspect for standard images is 4:3.
Colour temperature
The temperature of an object which is emitting light. If the 
colour temperature is high, the colors tend to take on a 
bluish tinge. If the colour temperature is lower, the colors 
tend to take on a reddish tinge.
Component video
Video signals which have the video brightness signals and 
color signals separated, in order to provide better image 
quality.
In high-definition TV (HDTV), it refers to images which 
consist of three independent signals: Y (luminance signal), 
and Pb and Pr (color difference signals).
Composite video
Video signals which have the video brightness signals and 
color signals mixed together. The type of signals 
commonly used by household video equipment (NTSC
, 
PA L
 and SECAM formats).
Video signals which consist of a carrier signal Y 
(luminance signal) within the color bar signal, and a 
chroma or color signal (CbCr).
Contrast
The relative brightness of the light and dark areas of an 
image can be increased or decreased in order to make text 
and graphics stand out more clearly, or to make them 
appear softer.
Cool-down
This is the process by which the projectors lamp is cooled 
down after it has become hot through use. It is carried out 
automatically when the [Power] button on either the 
remote control or the projectors control panel has been 
pressed to turn off the projector. Do not disconnect the 
power cable while cool-down is in progress, otherwise the 
cool-down process will not work properly. If the cool-
down period is not allowed to finish normally, the 
projectors lamp and internal components will remain at 
high temperatures, and this may shorten the useful life of 
the lamp or cause problems with the operation of the 
projector. The projector takes about 20 seconds to cool 
down. The actual time will vary depending on the external 
air temperature.
HDTV
An abbreviation for High-Definition Television. It refers to 
high-definition systems which satisfy the following 
conditions.
 Vertical resolution of 750p or 1125i or greater 
(p = progressive
 , i = interlaced)
 Screen aspect of 16:9
 Dolby Digital audio reception and playback (or output)
Interlace
A method of image scanning whereby the signal 
bandwidth used is approximately half that required for 
sequential scanning when images with the same still 
picture resolution are broadcast.
NTSC
An abbreviation for National Television Standards 
Committee, and a format for ground-based analogue 
colour television broadcasts. This format is used in Japan, 
North America and Central and South America.
PA L
An abbreviation for Phase Alternation by Line, and a 
format for ground-based analogue colour television 
broadcasts. This format is used in Western European 
countries except France, and also in Asian countries such 
as China and in Africa.
Progressive
A method of image scanning whereby the image data from 
a single image is scanned sequentially from top to bottom 
to create a single image.
Refresh rate
The light-emitting element of a display maintains the same 
luminosity and color for an extremely short time. Because 
of this, the image must be scanned many times per second 
in order to refresh the light emitting element. The number 
of refresh operations per second is called the refresh rate, 
and is expressed in hertz (Hz).
S-Video
A video signal which has the luminance component and 
color component separated in order to provide better image 
quality.
It refers to images which consist of two independent 
signals: Y (luminance signal), and C (color signal).
SDTV
An abbreviation for Standard Definition Television. It 
refers to standard television systems which do not satisfy 
the conditions for HDTV
. 
						

							50
Glossary
SECAM
An abbreviation for Sequential Couleur A Memoire, and a 
format for ground-based analogue colour television 
broadcasts. This format is used in France, Eastern Europe 
and the former Soviet Union, the Middle East and Africa.
Security lock
A device consisting of a protector case with a hole in it that 
a commercially-available theft-prevention cable can be 
passed through in order to secure the device to a table or 
pillar. This projector is compatible with the Microsaver 
Security System manufactured by Kensington.
SVGA
A type of image signal with a resolution of 800 
(horizontal) x 600 (vertical) dots which is used by IBM 
PC/ AT-compatible computers.
Sync. (Synchronization)
The signals output from computers have a specific 
frequency. If the projector frequency does not match this 
frequency, the resulting images will not be of a good 
quality. The process of matching the phases of these 
signals (the relative position of the crests and troughs in the 
signal) is called synchronization. If the signals are not 
synchronized, problems such as flickering, blurriness and 
horizontal interference can occur.
Tr a c k i n g
The signals output from computers have a specific 
frequency. If the projector frequency does not match this 
frequency, the resulting images will not be of a good 
quality. The process of matching the frequency of these 
signals (the number of crests in the signal) is called 
tracking. If tracking is not carried out correctly, wide 
vertical stripes will appear in the projected images.
VGA
A type of image signal with a resolution of 640 
(horizontal) x 480 (vertical) dots which is used by IBM 
PC/ AT-compatible computers.
XGA
A type of image signal with a resolution of 1,024 
(horizontal) x 768 (vertical) dots which is used by IBM 
PC/ AT-compatible computers.
YCbCr
The carrier signal which is contained in the color bar signal 
used in modern TV transmissions. The name comes from 
the Y (luminance) signal and the CbCr (chroma [color]) 
signals.
YPbPr
The carrier signal which is contained in the color bar signal 
used in high-definition TV (HDTV) transmissions. The 
name comes from the Y (luminance) signal and the PbPr 
(color difference) signals. 
						

							51
Appendix
Index
Air filter .................................................. 8
Air intake vent ........................................ 8
Aspect................................. 7,18,25,27,45
[Audio] port....................................... 8,12
Auto ...................................................... 18
Auto Setup....................................... 24,27
A/V Mute ............................................... 7
Background Color ........................... 25,30
Battery replacement period 
(Remote control) ............................... 13
Brightness..................................... 7,24,26  
Ceiling ........................................ 11,25,28
Child Lock....................................... 25,29
Cinema Filter........................................ 21
Cleaning the air filter............................ 40
Cleaning the air intake vent.................. 40
Cleaning the lens .................................. 40
Cleaning the projector case .................. 40
Color Mode ............................. 7,18,24,26
Color Saturation .............................. 24,26
Color Temp.............................. 7,20,24,26  
Component Video............................ 12,45
Composite Video ............................. 12,45
Configuration menu.............................. 24
Connecting to a computer .................... 12
Connecting to a video source ............... 12
Contrast ........................................ 7,24,26
Control panel .......................................... 6
[Control (RS-232C)] port....................... 8
Cool-down ....................................... 15,33
Correcting keystone distortion ....... 6,7,17
Correcting projector tilt ........................ 16
Display ............................................ 25,29
Focus adjustment............................... 6,16
Front adjustable foot ......................... 6,16
HDTV................................................... 45
High Altiude Mode ......................... 25,29
Image size............................................. 10
Image menu....................................... 24 
Indicators ........................................... 6,33  
Info menu .......................................... 25
Input Signal ..................................... 25,30
[InputA] port ........................... 8,12,15,46  
[InputB] port................................. 8,12,46
Keystone ............................... 6,7,17,25,28
Lamp - Hours Reset ................... 25,31,42
Lamp cover........................................ 6,42Lamp Hours  ........................................ 25
Language ......................................... 25,30
Lens cover ......................................... 6,14
Lens shift........................................... 6,16
Load Memory ................................. 24,27
Memory............................................. 7,22
Memory Reset ................................. 25,31
Menu Color ..................................... 25,29
Menus................................................... 24
Message .......................................... 25,30
Navigation Bar ..................................... 24
Normal ................................................. 19
Operation ........................................ 25,28
Operation indicator ........................... 6,33
Optional accessories............................. 44
Output Scaling ................................ 25,28
Overheating .......................................... 33
Picture Quality ................................ 24,26
Port ............................................... 8,12,46
Position ........................................... 25,27
Power cable .......................................... 14
Power inlet ........................................ 8,14
Progressive ...................................... 25,27
Projection ................................... 11,25,28
Projection distance ............................... 10
Projection image position 
adjustment ........................................ 16
Refresh Rate ......................................... 25
Remote control .................................. 7,13
Replacing the air filter ......................... 42
Replacing the battery ........................... 13
Replacing the lamp .............................. 42
Reset...................................... 24,25,27,30
Reset All ......................................... 25,31
Reset menu .................................. 25,31
Resolution ...................................... 25,45
RGB-Video ..................................... 12,45   
Save Memory .................................. 24,27
Screen.............................................. 25,27
Screen size ........................................... 10
SDTV ................................................... 45
Selecting the image source............. 6,7,15
Selection menu ...................... 15,18,20,22
Setup Level .......................................... 25
Setting menu ................................ 25,27
Sharpness ........................................ 24,26
Skin Tone ................................ 7,20,24,26
Sleep Mode ..................................... 25,29
Source .................................................. 25
Speaker................................................... 8
Specifications ....................................... 46
Squeeze ................................................ 19
Startup Screen ................................. 25,30Still......................................................... 7
Sub-menu ............................................. 24
Supported Monitor Displays................ 45
S-Video ........................................ 8,12,45
[S-Video]  port .............................. 8,12,46   
Sync Info.............................................. 25
Sync. ............................................... 24,26
Tint.................................................. 24,26
Top menu ............................................. 24
Tracking .......................................... 24,26
Turning off ........................................... 15
Using the configuration menus ............ 32
User’s Logo..................................... 25,29
[Video] port.................................. 8,12,46 
Video Signal ................................... 25,30
Volume ................................. 6,7,17,25,30
Warning indicator ............................. 6,33
YCbCr.................................................. 12
YPbPr................................................... 12
Zoom.................................................... 19
Zoom adjustment .............................. 6,16
Zoom Caption ............................ 19,25,28
A
B
C
D
F
H
I
K
L
M
N
O
P
R
S
T
U
V
W
Y
Z 
						

							All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or 
transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, 
without the prior written permission of SEIKO EPSON CORPORATION. No patent liability is assumed 
with respect to the use of the information contained herein. Neither is any liability assumed for damages 
resulting from the use of the information contained herein.
Neither SEIKO EPSON CORPORATION nor its affiliates shall be liable to the purchaser of this product 
or third parties for damages, losses, costs, or expenses incurred by purchaser or third parties as a result 
of: accident, misuse, or abuse of this product or unauthorised modifications, repairs, or alterations to this 
product, or (excluding the U.S.) failure to strictly comply with SEIKO EPSON CORPORATION’s 
operating and maintenance instructions.
SEIKO EPSON CORPORATION shall not be liable against any damages or problems arising from the 
use of any options or any consumable products other than those designated as Original EPSON Products 
or EPSON Approved Products by SEIKO EPSON CORPORATION.
General Notice: 
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
Macintosh, Mac, and iMac are registered trademarks of Apple Computer, Inc.
IBM is a registered trademark of International Business Machines Corporation.
Windows, WindowsNT and VGA are trademarks or registered trademarks of Microsoft Corporation in 
the United States. 
Dolby is a trademark of Dolby Laboratories.
Pixelworks and DNX are trademarks of Pixelworks, Inc.
Other product names used herein are also for identification purposes only and may be trademarks of their 
respective owners. EPSON disclaims any and all rights in those marks.
SEIKO EPSON CORPORATION 2005. All rights reserved. 
						

							Printed on 100% recycled paper.
E
Printed in China
410205000
05.XX-.XA(G04)