LCD _Liquid Crystal Display_

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					                                       Projector Information Pages

What is LCD?

LCD (Liquid Crystal Display)
LCD projection technology is the current leader of the pack, having captured the majority of the market
share of all projectors sold. Most LCD projectors have three panels. Each panel is a prism that allows
blue, red, or green light through its pixels. These separate colors are then converged and projected.
Electrical signals turn on pixels within a set based on the resolution of the unit. LCDs are known to
produce greater color definition, offering more shades or variations of color than single-chip DLP™
projectors. DLP™ projectors can sometimes burn definition out of the highlights and shadows with their
vibrant colors. Newer LCD projectors include special optics enhancers like micro-lens array that
minimize pixelization known as the "screen door effect." New LCD projectors have contrast ratios as high
as 800:1. By comparison, DLP™ projectors contrast ratios are as high as 3000:1. The portability and
brightness of LCD projectors have made them a popular choice for traveling presenters. The lightest LCD
projectors weigh-in at about 4 lbs.

Lumen Guide

How bright should your projector be for your room?

Below is a fast and easy reference for you to use to help determine how bright a projector
you need for your room.

          Controlled     4:3 Screen
          lighting       Screen
                                   72"               100"          120"          150"
          Low            Size/
                                (43" x 57")       (60" x 80")   (72" x 96")   (87" x 116")
          ambient        Lumens
          light          1000
          Some           1200
          ambient        1400
          Bright         1700
          light          2000
Controlled lighting- If you plan to use your projector in a room where there are no
windows, such as a basement, or if you use your projector primarily at night, any
of today's projectors will provide a bright image.

Low ambient light- Little to no light entering room.

Some ambient light- Some additional light in room. Slightly dimmed, window
blinds leaking some light.

Bright ambient light- Windows open during daylight hours, lights that cannot be
dimmed like in an open office settings. Bright enough for audience note taking.

*For video signals, your actual lumen output may vary from manufacturers
specified levels, due to the lower luminance output from video signals. Variations
differ from projector to projector, so contact a Projector People representative to
find out more.

Video Projector resolutions
By Susan Jakobic - Data Image Systems, Inc

In this ever-changing world of computer projector technology, manufacturers have made LCD
projectors "smaller, lighter, brighter" over the last five years. I used to make the comment
years ago when I was lugging around 40 lb. projectors with 250 ANSI lumens that someday
projectors would be small enough to fit in my purse.

Well that day is basically here. The Epson PowerLite series projectors weigh between 5.8 and
18.3 pounds, produce super bright images and come in three computer video resolutions:
VGA (640x480), SVGA (800x600) and XGA (1024x768). These projectors can also handle
wide-screen video images. Projectors are typically very "user friendly" in their set-up and
operation. For the most part, users don't even need to read the manual.

But there is one issue that is still very confusing to many people. It's the issue of "resolution"
... and which "resolution" projector should you purchase. I get calls daily from teachers, media
specialists and technology coordinators who don't fully understand this resolution thing. What
is resolution? Well, the resolution is the number of pixels, or size of the display area on your
computer monitor ... specifically, the number of pixels across (horizontal) and down (vertical).
More pixels mean greater resolution; smaller letters and more information can be packed onto
the same-sized screen. People with small monitors usually use VGA, 640x480 or SVGA,
800x600 resolution. People with larger monitors often switch to XGA, 1024x768 resolution
so that they can fit more information on the screen.

On a Windows computer, you can check to see your computer's display resolution by
selecting Settings>Control Panel>Display from the Start Menu. Click on the Settings About
halfway down, the Desktop Area section will indicate your computer's current display
resolution. You can change these settings (how much depends on your video card's
capabilities) by moving the lever to the right or left. Windows will resize your display. You
may want to experiment by viewing these different resolutions. Don't worry; you can always
set the display resolution back to its original setting.

On a Macintosh computer, users can go to Control Panels>Monitors & Sound (or just
Monitors if you're using System 9) and select the Monitor button if it is not already selected.
On the lower left, under Resolution, you will see the various selectable resolutions with the
current resolution and vertical refresh rate indicated by the highlight bar.

You may notice when reading technical specification information for a given projector, it
states SVGA projector(s) will also handle XGA "compression". That means that you can feed
an SVGA projector a higher 1024x768 signal, but since the projector's window, or display
area, is only 800x600, it "squishes", or compresses, that higher signal down to fit in it's
800x600 window. Well, "something" has to give, so in this situation, small text and fine lines
are affected and may appear fuzzy or out of focus. If you're projecting larger fonts or pictures,
like a Power Point slide show, you may not even notice the compression. The same thing
happens when an SVGA image is expanded to fill an XGA screen.

So how do these resolution and compression issues affect which projector will be the best
projector solution for your needs? Unless you're running high-end CAD lab applications or
just purchased a new laptop computer "with the bigger screen" which is typically running at
XGA resolution, SVGA projectors are more than adequate for classroom or auditorium
presentations. An added advantage of an SVGA image on a given size screen is that although
you will have less desktop area to show everything you do show will be bigger, especially
those small application level fonts.

Speaking of these new "laptops with the large screen", I'm aware that many schools are
getting new laptops to allow teachers and administrators the flexibility of giving presentations
throughout their districts. However, there are a few issues when using them with lower
resolution projectors. If you have a new XGA laptop and already have an SVGA projector,
can you use them together? The answer is "Yes, but there are a few "trade-offs" involved. You
either view projected images in compression or need to make a few changes in your system
settings (not a problem):

   1. COMPRESSION: Since your laptop is running at the higher resolution, the projector
      has to display your images in compressed mode to be able to fit the 1024x768 laptop's
      window of information into the projector's 800x600 window. Remember, small text
      may appear fuzzy or out of focus.
   2. CHANGE YOUR RESOLUTION: You can go into Windows and set your display's
      setting down to 800x600, but here is the "trade-off" ... you'll lose the ability to view
      your laptop screen along with the projected image. To get your computer to truly make
      this change you need to turn off your laptop screen and send the image only to the
      projector to be able to get the laptop to display the true 800x600 image. (this is a
      Windows "thing", not the fault of the projector). The procedure to turn off your laptop
      screen differs between laptops. It usually requires depressing the Function key and
      another function key at the top of your laptop's keyboard that is marked "CRT/LCD" or
      has a picture of a monitor. You may need to refer to your laptop manual or in-house
       computer technician to determine the proper procedure for your particular laptop.
       Actually, not being able to see your laptop screen isn't all that bad. If you're taking
       advantage of the Epson projector's remote mouse capability, you'll be standing in front
       of your audience and directing your attention to them ... not your laptop screen ... and
       that makes you look even better as a presenter!

                                        Projector Resolution

Resolution refers to the number of dots of light that appear on a screen or a projection to make up a
projected image. Take care to note the "native" resolution of the projector you're interested in - while a
projector may be able to work with several different notebook computer resolutions, there is one native
resolution at which it works best.

Choosing the right resolution for your projector is as easy as knowing the resolution of your notebook.
Don't forget, though, that if you plan on upgrading your notebook after getting a new projector you're best
off buying a projector with a fairly high resolution that will match newer laptops.

Your presentation won't come to a screeching halt if your notebook and projector don't have the same
resolution. Virtually all models can accept higher or lower resolution images than their native resolution,
using interpolation to either expand or compress the pixels that compose the image. However, expect to
lower your standards a bit for for such interpolated images, since this will usually degrade the quality of
the image.

The most common resolutions, from cheapest to most expensive, are VGA (480x640), SVGA (800x600),
XGA (1024x768), and SXGA (1,280x1,024).

Resolution of projectors is differentiated in four categories
UXGA (1,600 x 1,200) - UXGA is for very high resolution workstation applications that are detail or
information intensive. These are expensive projectors that support a broad range of computer equipment.

SXGA (1,280 x 1,024) - SXGA products are high resolution, and notably more expensive than XGA.
These products are targeted for high-end personal computer users and low-end workstation users. They
are used primarily for command and control, engineering and CAD/CAM applications where acute
resolution of small details is important.

XGA (1,024 x 768) - XGA is suitable for relatively high-resolution images from videos, spreadsheets,
and graphics. XGA projectors are generally more expensive, and are an equally popular resolution format
to SVGA. They have gotten more popular as XGA resolution computers have become more plentiful.

SVGA (800 x 600) - This is a very popular resolution today, because of their attractive prices and great
images. SVGA is good for projecting simple graphics and presentations. Personal computers often have
an SVGA or XGA resolution.

Higher Resolution: High-resolution projectors are able to show more picture details than low-resolution
projectors. Also, since there are more pixels used to make the image, each individual pixel is smaller, so
the pixels themselves become less visible on the screen.
Lower Resolution: Lower resolution projectors are much less expensive, and they can produce images
that are just as bright and attractive as higher resolution machines. Unless you really have a need to
display fine details, lower resolution products will be your best bet from a cost perspective.

                                                                  You need at least this much Consider this
     If you mainly use:
                                                                  resolution:                 projector class:
     PowerPoint type presentation software, clip art, or simple
                                                                  800 x 600                   SVGA
     graphics (pie and bar charts)
     Excel type spread sheets and detailed graphics such as
                                                                  1,024 x 768                 XGA
     (architectural drawings)
     CAD/CAM applications or ultra high-resolution graphics       1,280 x 1, 024              SXGA

                                       Projector Buying Considerations

Contrast - Contrast is the ratio between the brightest and darkest areas of the image. Contrast ratios
should be high (400:1 or higher) to get the best video image or the most legible computer/graphics image.
Room light substantially impacts contrast ratios. Consider projectors with very high contrast ratios if you
intend to use your projector with the lights on.

Rear Projection Capability - If you want to set up a rear-projection system, the model must have the
ability to reverse the image so that it appears correctly on the screen. Most models have this feature today,
but if you need it, you can eliminate any projector that does not have this capability from your short list.

Video Format Compatibility - The standard video formats are NTSC, PAL, and SECAM. Many
projectors accept all three.

Video Signal Standards - Most video devices accept composite and S-video as two types of signal
transmission. Almost all projectors will accept both inputs. However, there is a new standard known as
component video. Some of the new DVD players offer a component video output signal in addition to
composite and S-video. You will also be able to get component video signals from some satellite systems.
Televisions and projectors that are equipped to handle the component video signal will produce a superior
video image than those, which cannot. If you are interested in optimizing video performance and you have
a video source that offers component video output, check to see which of the projectors on your list are
capable of accepting a component video signal. The spec sheet may say component video, or alternatively
(Y, R-Y, B-Y) or YPbPr.

Ceiling Mountable - If you want to mount your projector on the ceiling, it will need the capability to
project the image upside down. The large majority of projectors do this today but you must verify that a
ceiling mount exists as an option for this product.

Universal Power Supply - Universal power supply means the unit will automatically detect different
voltage levels, such as 110 volts in the United States or 220 volts in Europe, and adapt easily to them
both. If you plan to travel with your projector in countries with different power systems, this is a must.

Multiple Computer Ports - If you want to connect multiple computers or video sources to the unit
simultaneously, you will need multiple input jacks to accommodate this.

Data Signal Ports - Most importantly, make sure the model you choose supports the computers you
intend to use now and in the near future. This is a significant investment and the pace of change in the
computer industry should be a consideration. PC and PC compatibles are nearly always supported with a
direct connection, but Macintosh may be a separate connector or require an adaptor. If you are using a
workstation, check that the models you intend to use are supported in the manner you intend to use them
and if adaptors are needed, know whether they are included or an additional cost item.

Uniformity - The uniformity of brightness and contrast between black and white are just as important to
overall image quality as the oft-cited brightness figure. Manufacturers who focus too intently on boosting
the lumens number may offer models that produce noticeable hot spots in the center of the picture or
washed-out images due to over-lighting. Uniformity and contrast figures can help you pinpoint these
potential problems.

Color temperature - This is often referred to as "white point" and it affects how accurately a projector
displays whites and grays. Historically, color temperatures of 6,500 and 9,000 degrees Kelvin have been
considered "ideal" temperatures for "true white" in video and data modes, respectively, and they are still
good reference points. Our brain's perception of white varies as the light source changes, and today's
brighter light bulbs generally give us different shades than their predecessors did 60 years ago, when these
lighting standards were created. Specific viewing environments also affect our perceptions of white and
other colors.

Color reproduction and sharpness - These also affect the image quality, but they are harder to quantify
without very technical data. AV Avenue's image comparisons (found in various product reviews) can be
helpful in evaluating these criteria, and they will help you understand what to look for in a selection of

Standard LCD - These LCD (liquid crystal display) projectors have one panel of LCD glass that controls
the three primary colors. These projectors are becoming less common in the projector marketplace, as
polysilicon LCD and DLP projectors gain popularity.

Polysilicon LCD - These projectors control colors through three panels and are considered to be of higher
quality than standard LCD. The projection through three panels allows polysilicon LCD projectors to
have higher color saturation than a standard LCD projector.

DLP - DLP (digital light processing) projectors use a single chip with thousands of micro mirrors to
modulate the lamp's light and project it through the lens. DLP systems are composed of over 400,000 tiny
mirrors, which modulate light from a lamp and project the "modulated" signal out through the lens onto a
screen. This technology is also referred to as DMD (Digital Mirror Device). DLP projectors are one of the
more common types of projectors on the market.

                                Glossary of Common Presentation Terms


Ambient Light:

Any light in the viewing room created by a source other than the projector or screen.
Aspect Ratio:

The ratio of height to width of a frame or screen. In a 4:3 aspect ratio, the width of the image is 4/3
times the height. Most current TV and computer video formats are in a 4:3 aspect ratio. A 15 inch
monitor is 12 inches wide by 9 inches high (9*4/3 = 12). A resolution of 640x480 is a 4:3 format
(480*4/3 = 640). SXGA is a 5:4 aspect ratio is (1280x1024), HDTV is 16:9 for that movie theater feel,
and 35mm slides are 3:2.

ANSI Lumens:

ANSI stands for American National Standards Institute. It is a standard for measuring light output.
Different lamps play a role on light output. Halogen lamps appear dimmer than another metal-halide,
even if the two units have the same ANSI lumen rating. Type of LCD technology (active matrix TFT,
Poly-Si, passive), type of overall technology (LCD vs. DLP vs. CRT), contrast ratios, among other
factors can also affect the end result.


Jagged edges along the outer edge of objects or text. Anti-aliasing refers to software adjustments that
correct this effect. This effect is created by inadequate sampling techniques in computer-produced


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A remote control, projector control panel, or other object illuminated from behind. This can be helpful
when working in darkened rooms.


The frequency range of a particular transmission method. In video systems, this value is expressed in
MHz, and the better the signal, the greater the bandwidth required.

Bit Mapped Graphics:

The type of graphic that is defined and addressed on a bit-by-bit basis which makes all points on the
screen display directly accessible.

Used with coaxial cables, this connector receives all R, G, B, H-Sync and V-Sync information, and
composite video.

Build Slide:

"Build series" slides show audiences where a topic is heading a line at a time. Each new line added
appears in a bright color while previous the line drops back to a darker color.


A graphic element inside an interface that represents an embedded action or function.


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Color Temperature:
A method of measuring the "whiteness" of a light source. Metal halide lamps produce higher
temperatures than halogen or incandescent lights.

Graphics that have been previously published which can be imported into a presentation simply by
copying and pasting.

Color Resolution:
The total number of colors available, expressed in bits per pixel.

When different hardware or software can be used together without a major over-haul.

Contrast Ratio:
The ratio between white and black. The larger the contrast ratio the greater the ability of a projector to
show subtle color details and tolerate extraneous room light. There are two methods used by the
projection industry: 1) Full On/Off contrast measures the ratio of the light output of an all white image
(full on) and the light output of an all black (full off) image. 2) ANSI contrast is measured with a pattern
of 16 alternating black and white rectangles. The average light output from the white rectangles is
divided by the average light output of the black rectangles to determine the ANSI contrast ratio. When
comparing the contrast ratio of projectors make sure you are comparing the same type of contrast. Full
On/Off contrast will always be a larger number than ANSI contrast for the same projector.


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Diagonal Screen:
One corner of a screen to the opposite corner. A 9FT high, 12FT wide, screen has a diagonal of 15FT. If
the screen is 12x12, it would still rate 15FT diagonal since that would be the diagonal usable.

Desktop Videoconferencing:
Videoconferencing via personal computer.

Digital Light Processing (DLP):
Developed by Texas Instruments, DLP is a light processing system that utilized hundreds of thousands
of tiny spinning mirrors to reflect images. Many feel it is the most accurate reproduction of color and
images available today.

Dot Pitch:
The distance between the dots on a CRT display. The closer together the dots are create a higher
resolution of a displayed image.

Making digital images appear smoother by adding color or random noise during the digitization process.


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AKA Enhanced Graphics Array, EGA is an image which displays 640 pixels by 350 lines with 16 colors
from a palette of 64 colors.


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Front Room Projector or Position:
A unit that sits close to the screen, its short throw lens projects an image size that is about the same as
the distance to the screen. 6FT diag. screen = 6FT distance. Generally the unit might be as close as 3/4
the screen size or as far as 1.2 times image size.

Front Room Projector or Position:
A projection unit that sits close to the screen, thereby requiring a shorter throw-distance.

Flat Screen:
A CRT made more flat than a standard tube by using more than one electron gun. Beneficial to people
who require concise reproduction and great detail such as graphic designers.

Focal Length:
Focal length is the distance between the lens and its focal point. A smaller focal length indicates a
wider-angle lens.


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Synchronizing signals between two video sources, which is necessary when overlaying computer
graphics on an image from VCR, camera, or videodisc player.

A shadow or weak secondary image as seen on a monitor or display which is created by multiple path
broadcast transmission errors.


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High Gain Screen:
A screen that uses one of more methods to collect light and reflect it back to the viewing audience,
which will increase the brightness of the image over a white-wall or semi-matte screen.

H Sync:
AKA Horizontal synchronization. A marker, which indicates to a computer or video signal that it, is the
beginning of a line.

AKA High Definition Television. High definition, wide-screen television broadcasting with digital

Horizontal Frequency:
AKA kHz, the total number of horizontal lines scanned per second in a displayed image.

Horizontal Resolution:
The total number of vertical lines individually perceived across the horizontal rows of a monitor.

AKA Hertz. A measure of frequency in cycles per second. Used to express the frequency of an electrical
signal or event.


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Invert Image:
Many projectors that are ceiling mounted are mounted upside down. Invert image corrects the image
digitally so your projected image is not also upside down.

Technique used to reduce flicker caused when the first created video field fades while the next is being


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AKA Joint Photographic Experts Group. An international group, which is working, on a proposed
universal standard for the digital compression and decompression of still images used in computer
systems. The JPEG idea reduces image size as much as 65:1 and still maintains image integrity by
getting rid of subtle color differences the human eye can not see.

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Keystone Correction:
A projectors ability to correct the effects of "pointing up" or "pointing down" at a screen enabling the
projector user’s audience to view a rectangular image rather than one with a wider top or bottom.

The distortion (usually a wide-top narrow-bottom effect) of a projected image caused by a projector
"pointing up" or "pointing down" at its screen. Named after its similarity in shape to the keystone used
in constructing an arch.


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AKA liquid crystal display. This technology comes in many forms, sizes, and resolutions. Its primary
purpose is to present a digital image for viewing. They are used in many notebook computer displays
and also used as technology inside a projector to project high-resolution digital images.

Laser Pointer:
A hand held device that emits a thin laser beam that focuses a bright dot (usually red) on projected
images or just about anywhere. Used by presenters to direct the viewer's eye to a particular point of

A screen surface that has an embossed geometric shaped pattern that affects view/angle performance and
reflection of ambient light.

Long Throw Lens:
A lens designed for projection from the back of a room. Long throw lenses would be used a projection
booth in the back of a theater, or from the back of a large classroom. A long throw lens would have to be
50 to 100 FT back to project a 10FT diagonal image.


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Metal Halide Lamp:
The type of lamp used in most high-end portable projectors. These lamps output a very "hot"
temperature light, similar to lamps used in streetlights. Metal Halide whites are super white (with a hint
of blue) and make Halogen lamp white very yellowish by comparison.

Multimedia Presentations:
The integration of text, art, graphics, photography, animation, audio, and video into presentations.

The condensing of many signals into a few or one signal that still represents all of them. An LCD panel
performs the de-multiplex function. It takes video signals that contain whole frames of video data and
displays them as individual signals on each pixel.


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The USA’s broadcast standard for video and broadcasting. It is actually a lower resolution than systems
used in most of the world. However, by the year 2002 stations will be required to broadcast higher
resolution video signals.

Allows two or more computers to exchange information quickly and easily.


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Material that a computer generates from its memory for display on a monitor or for transfer to other
media, such as paper or magnetic storage such as zip or floppy disks or a CD-ROM.

The capability to superimpose computer-generated graphics and/or text on motion or still video.

Overhead Projector (OHP):
An OHP is designed to project images from transparencies onto a screen.


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AKA Phase Alternation by Line. The standard color system used throughout Western Europe, except in

Poly-Si (silicon) LCD: A popular LCD technology for the top of the line LCD projectors, which results
in increased color saturation, with contrast ratios above 200:1.

Short for picture element. The smallest element in a displayed image. A color pixel is a combination of
red, green and blue subpixels. Total pixels are usually expressed in horizontal x vertical dimensions (e.g.
640 x 480).

Power Zoom:
A zoom lens with the zoom in and out controlled by a motor, usually adjusted from the control panel or
a remote control. This is as compared to Digital zoom, which does this same function Digitally.

Presentation Ergonomics:
The study and science of optimizing relationships between a presenter and the presentation environment.
Projection Axis:
Direction of the "imaginary" line that extends from the center of the projection lens through the center of
the screen.


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Red, Green, Blue; the type of monitor generally used with computers. RGB input or output often
referred to as Computer input or output.

RCA connector:
The connector used with VCRs and stereos for composite video signals and audio.

Real Time:
The transfer of data that returns results so quickly that the process appears to be instantaneous.

Rear Projection:
Projecting an image through a translucent screen material for viewing from the opposite side. This
method of projection is also an option for home theater use in large spaces.

Remote Mouse and Keyboard Control:
Allows presenter complete control of computer presentation without direct access to projector. Allows
for freedom of movement.

Number of pixels (or dots) per unit of area, measure in number of pixels wide by the number of pixels
high that can be displayed on the screen or monitor. More pixels per unit of area produce a higher

A cable that connects a computer and its peripherals.


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AKA Subtractive Bi-Refringent Effect, a technology that allows two panels rather than three to generate
the full 16 color VGA palette. The top panel provides white, magenta, blue, and cyan; the second brings
colors from white through yellow and to red.

The French broadcast standard (used in some other international markets) for video and broadcasting.
Like PAL, SECAM is also a higher resolution than that of the US, until 2002.

Simulated color:
Also known as "false color," or "colorized." Projected colors that are not the same as the original image.
Some products use a single, colorized LCD, often with purple for dark shades and yellow for light
shades (purple background/yellow foreground). Therefore, what should appear on a screen as blue may
be yellow, green may be purple.

AKA Super VGA. Refers to a computer signal that is higher than the standard VGA resolution of 640
pixels by 480 lines with 16 or 256 colors. SVGA graphics cards may output resolutions such as 1024 x
768, 1280 x 1024, 1600 x 1200 pixels or higher, with 16.7 million colors displayed.


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AKA Thin Film Transistor. A technology used to make Active Matrix LCD panels wherein each pixel
has its own transistor switch.

Throw Distance:
Length of the projection beam required for a projector to produce and image of a desired size.

AKA Triple Super Twist Neumatic. A technology used to make Active Matrix LCD panels wherein
each pixel has its own transistor switch.


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Resolution of a computer generated image. A UXGA projector will be able to display a 1600x1200
image from a computer running in a UXGA video mode. If the computer is not running in a UXGA
video mode, typically the projector will resize the image to 1600 x 1200.


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VGA Resolution: VGA Resolution normally refers to a 640 x 480 pixel display, regardless of the
number of colors available. Originally VGA was 640 x 480 16 colors.

AKA Vertical synchronization. A marker in a video signal for the beginning of a frame.

Varifocal Lens:
A projector lens that has three focal elements contained in a single assembly.

Vertical Resolution:
The total number of horizontal lines that can be perceived in the vertical direction of the screen.

AKA Video Graphics Array. This is the standard interface for the IBM PS/2. It is the only analog
graphics card IBM has used (other cards handle digital information) 720 x 400 in the text mode,
graphics mode 640 x 480 resolution.

Video Compatibility:
Ability of computers and projection units to transmit and receive data to read and/or project various
video tape standards such as NTSC, PAL, SECAM and S-VHS.


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Document-conferencing product that lets multiple users simultaneously view and make notes on a
document with pens, highlighters and drawing tools.


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Acronym for Extended Graphics Adapter. A standard introduced by IBM that includes VGA as well as
resolutions up to 1024 pixels by 768 interlaced lines.


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Y/C Connector:
A 4-pin DIN connector used for high-end S-video sources.

A cable that splits the monitor signal so that it will work simultaneously with both a monitor and a LCD


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Zoom Lens:
A lens with a variable focal length. This translates to being able to adjust the size of the image on a
screen by adjusting the zoom lens, instead of hAudio Visual Innovationsng to move the projector closer
or further.