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Question Quick Link
- What are VGA, SVGA, XGA
and SXGA?
These are computer pixel resolutions. VGA is 640 x 480, SVGA is 800
x 600, XGA is 1024 x 768 and SXGA is 1280 x 1024.
- What is DLP™
and DMD™?
DLP™ stands for Digital Light Processing and DMD™ stands
for Digital Micro-mirror Device.
This system is based on thousands of tiny mirrors move to reflect the
light and create the image on a projection screen. In electromagnetic
it is called DMD™ and in optics it is called DLP™.
- What
is single panel LCD projector?
This is one kind of LCD technology which projects light through a single
amorphous liquid crystal panel containing red, green and blue pixels.
It usually makes the projector more compact and lighter.
- What
is three-panel LCD projector?
This is one kind of LCD technology which projects light through three
poly-silicon LCD panels, one each of red, green and blue, to achieve
the final projected image. These panels are the size of a quarter (There
are three kinds in the market including 0.9", 1.3" and 1.8").
Since each panel displays only its primary color, better color saturation
and a larger color palette can be achieved. Also, the three-panel design
provides a much greater contrast ratio.
- How
does the projector connect to the computer?
A VGA cable connects directly from the video port of a computer to the
projector.
- What
is "ANSI"?
" ANSI" stands for the American National Standards Institute.
- What
is a "Keystone Correction"?
It is used to make the projected image square. Keystone correction is
the device that will correct an image of the distortion (usually of
a wide-top narrow-bottom effect) of a projected image caused by improper
projector to screen angle.
- Can
I view my computer monitor and the projected image at the same time?
Yes, you can view your image on the computer monitor as well as the
projected image at the same time. This is called the monitor loop-through
function or simultaneous viewing.
- What
is "Hertz" in reference to how the "Refresh rate"
affects the displayed image?
"Hertz" is a measure of frequency in cycles per second ("Hz"
abbreviation for "Hertz"). The "Refresh rate" is
the number of times per second during which a displayed image is regenerated,
expressed in Hz. For example, a refresh rate is 60 Hz means that a displayed
image is regenerated 60 times per second. The higher the refresh rate,
the more stable (less flickering) the picture appears.
-
Why does the computer display adapter affect simultaneous viewing (being
able to view your notebook display and the projector at the same time)?
Or what component in the computer display adapter sends a signal that
allows for simultaneous viewing?
The display adapter is also called the graphics card and is known by
many other names. Each display adapter has a different driver. Those
drivers give directions to the signal transmitted to the external image,
which decides on simultaneous viewing. Right now, only the notebook
computers can do simultaneous viewing. The display adapter's mother/control
board controls that function along with maximum resolution, maximum
refresh rate and the number of colors that can be sent to the monitor.
- Why
is the Mac pixel count and refresh rate sometimes different from the
PC?
Due to the different designs between the Mac and PC operating system,
the pixel count and refresh rate will sometimes be slightly different.
- What
is the working distance of the remote mouse?
The typical range is 80 feet. I am using a projector with my notebook
computer and can't get the projector to show my computer image. What's
wrong?
You need to activate your notebook's external monitor port. Usually
you press one of the top row function keys. If necessary, consult your
notebook's manual.
- I
can't get the projector to show my notebook computer image. What's wrong?
You need to activate your notebook's external monitor port. Usually
you press one of the top row function keys. If necessary, consult your
notebook's manual.
- I
am using a projector and the projected image doesn't look very good.
What's wrong?
Most new projectors have an automatic setup ensuring that the projector
matches the computer resolution. However, in some cases the adaptation
process may somewhat impair the quality of the image or fail to find
the correct resolution. Check under Control Panel/Display/Settings.
If you're not sure what resolution your projector is, just change your
display settings and see if the image improves. Although most projectors
will project an image when the computer is set to a different resolution,
the quality of the image usually deteriorates.
- Will
the projector connect to both IBM® compatibles and Macintosh®
computers?
Yes, most projectors come with cabling and adapters to connect to both
IBM compatibles and Macintosh computers. Connecting to any projector
requires your computer to have an external monitor port (most do).
- Can
I show high-resolution images on a low-resolution projector?
Many LCD projectors can compress higher resolution computer displays
to their native resolution. There are always compromises with this approach,
and some of the finer detail and text in your higher-resolution images
will break up with this technique. However, still photographs, animations
and some technical illustrations will probably hold up well when reduced.
The key is the degree of reduction. Images that are remapped from 1024
x 768 sources will not look as good at 640 x 480 as they will at 800
x 600.
- Will
my projector support the different video standards?
Yes. The signal processing electronics in most of today's LCD projectors
are smart enough to recognize the North American NTSC standard, the
PAL standard in Europe, Central/South America and Africa, and the French
SECAM standard.
- What
kind of cables will I need to use with my LCD projector? What's the
purpose of the different video cables found in the box?
For most presentations, you'll need a computer display cable, video
cable, audio connection, and AC power. Every LCD projector comes with
at least one computer-to-computer cable, usually with 15-pin DSUB plugs
to fit PC standard computers. You should purchase a video-to-projector
cable and a stereo audio cable to fit the equipment of your choice.
S-video jacks are also provided on LCD projectors for higher-quality
video playback. Your LCD projector may also come with a remote control
like the mouse with your computer. Check the computer's user manual
to see how this feature works. Unsure what cables to buy? Your local
audio-visual dealer can provide the correct computer, mouse, video,
and audio cables in the correct lengths or contact Projector Concepts
for custom made Straightwire cables.
- What
is the difference between optical and digital keystone?
The optical keystone angle is the angle between the optical axis and
the center of the projected image. This varies by some degrees and is
dependent of the position of the zoom lens. This angle is actually a
fixed angle and can only be "changed" by turning the zoom
lens
Digital keystoning gives you the possibility to have a correct square
image, even when the image is thrown upwards in desktop mode or downwards
in ceiling mode. This is achieved by an asymmetrical scaling, providing
a square projected image when/if the projection lens is tilted in comparison
with the projection screen.
- Video
and the different formats - what are the differences?
- PAL/SECAM/NTSC - You can't
get higher video resolution than the broadcast standard. The PAL/SECAM
video system has a vertical line resolution of 625 lines, but only
approximately 575 lines are holding picture information.
TV systems that are utilizing the NTSC standard have 525 lines (vertical
resolution), but only 480 lines will be holding picture information.
The aspect ratio in all systems are 4:3 and the NTSC standard has
consequently 480x4/3 = 640 dots/pixels of horizontal resolution.
The native resolution of an XGA based projector (1024 x 768) is
768 lines (vertical resolution), but the source most probably will
not provide 768 lines of vertical resolution. A SVGA based projector
(800 x 600) has 600 lines of vertical resolution. Most video projectors
can display over 500 lines of vertical resolution.
- Component video (no defined standard)
- The normal interpretation of a component video signal is one in
which the luminance and chrominance are sent as separate components
called YUV.Interlaced component YUV (YPbPr) video output is normally
in the form of 3pcs RCA or 3pcs BNC connectors. Connectors may be
labeled YUV, color difference, YPbPr, or Y/B-Y/R-Y, and may be colored
green/blue/red. (Some players incorrectly label the output YCbCr.)
The sync output is present in the luminance pin (Y), i.e. as a regular
black/white TV signal.
- RGB-Video - RGB component
video output is also a component signal and is normally viewed via
a 15-pin VGA connector or on 3 RCA or 3 BNC connectors labeled R/G/B.
Component video signals retain maximum bandwidth, unlike composite
systems.
- S-Video - In S-video, the
two signals - the color information and the black/white information
are traveling in two individual cables, and thus give an "interference
free" image that looks better than a C-video image.
- Composite Video - A composite
video signal has the color information and the black/white information
(luminance =Y) in the same cable. This causes interference to appear
between the two signals, which is seen as slight blurry edges and
not 100% sharp contrast in the video image. This is the lowest video
quality.
- What
is the difference between HDTV, EDTV, and SDTV?
- HDTV – Stands for High
Definition Television. HDTV is broad cast with a vertical resolution
of 720p or 1080i and is broadcast in a 16:9 (widescreen) aspect
ratio. HDTV transmissions also carry Dolby Digital 5.1 surround
sound. HDTV will ultimately replace today’s existing analog
“NTSC” television system. The target date for the transition
to HDTV is 2006.
- EDTV – Stands for Enhanced
Definition Television. EDTV must have a vertical resolution of 480p
and can be in 4:3 or 16:9 formats. It also can carry or reproduce
Dolby Digital 5.1 surround sound. A good example of EDTV is a progressive
scan DVD player.
- SDTV – Stands for Standard
Definition Television. SDTV’s vertical resolution is less
than 480p and is typically broadcast in a 4:3 mode.
- How
important is lumens when choosing a home theater projector?
When choosing a projector, lumens are important. Generally speaking,
the brighter the room and the bigger the screen the more lumens your
projector should have.
- Do
I have to have the projector professionally installed?
If you’re not a do-it-yourselfer Projector Concepts can help you
find a CEDIA certified installer in your area to help you with the install.
For those do-it-yourselfers, Projector Concepts has the accessories
you need such as mounts, cables, and screens.
- Can
I watch regular TV with my projector?
Yes. You can watch regular TV on your projector. To do this, you must
have some sort of tuner. If you have standard cable with no box, you
can use your VCR as a tuner. Simply connect your coaxial cable from
the cable company to the VCR and run a composite video (Yellow) cable
out from the VCR to the in on the projector. If you have a cable/satellite
box, they will work as your tuner as well.
- How
important is a screen?
Screens can be very important when using a projector. Based
on room conditions and lighting, screens can enhance the picture even
more by cutting down on light spillage and decreasing light reflection.
Screens will also help determine at what viewing angle you will be able
to clearly see a picture. Projector Concepts can help you pick out a
screen for your needs by asking you a few questions.
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