Projector Expert White Paper Series:
Projectors 101 —Educate Yourself About Projectors
©2011 Optoma Technology, Inc.
8
What Contrast Ratio Do I Need?
Contrast ratio measures how well a projector can reproduce black and white (or
how black is the blackest black and how white is the whitest white). The simplest
way to explain this measurement is to say that it’s the difference between the
darkest and brightest spot on the image being displayed, which is communicated
as a ratio.
Although contrast ratio is of interest to those using projectors for still
presentations (especially if the presenter uses a lot of text or black and white
charts in the presentation), this measure is more important if you will be
projecting video. Basically, a higher contrast ratio indicates a greater ability for
the projector to show subtle color details and tolerate extraneous room light.
Keep in mind that when there is ambient light in the room, the practical contrast
ratio may be dramatically reduced.
What Input/Output Options Do I Want?
Today’s projectors offer an array of input and output connectors. A projector
with both HDMI and VGA ports lets you connect to a variety of video sources,
including set-top boxes; DVD, Blu-ray players; camcorders; PCs; video game
consoles; and AV receivers. HDMI (High-Denition Multimedia Interface)
supports, on a single cable, any uncompressed TV or PC video format, including
standard, enhanced and high-denition video. VGA allows users to readily
connect the projector to a PC or other VGA-compatible device.
Up to 300” with a High Brightness Projector
Up to 180” with a Standard Projector
50”–70” with a Flat Screen TV
Image Size Comparison
1 5
2
4
4
800 x 600
1024 x 768
1280 x 800
1920 x 1080
1920 x 1200
Frame Packing
3D Television
Frame Sequential
Side-by-Side Checkerboard
LEFT PIXELS RIGHT PIXELS
INDICATES BEST 3D VIEWING POSITION
What Should I Consider Concerning Projector Size
and Weight?
Common sense should reign when deciding on what size projector to buy. The
smallest Pico projectors can be readily slipped into a pocket or briefcase, while
larger, but still portable projectors can be brought along with little effort. Consider
whether you will be travelling with your projector and choose accordingly. Many
projectors weigh six pounds or less and come with a carrying case or backpack,
making them easy to carry along. For a heavier projector, a hard-sided case with
wheels will ease transport. Pico projectors, meanwhile, weigh in at less than half
a pound and t into a pocket, purse or briefcase easily.
Up to 300” with a High Brightness Projector
Up to 180” with a Standard Projector
50”–70” with a Flat Screen TV
Image Size Comparison
1 5
2
4
4
800 x 600
1024 x 768
1280 x 800
1920 x 1080
1920 x 1200
Frame Packing
3D Television
Frame Sequential
Side-by-Side Checkerboard
LEFT PIXELS RIGHT PIXELS
INDICATES BEST 3D VIEWING POSITION
Contrast Ratio: How Black, How White?
A high contrast ratio is desirable, particularly
when projecting presentations and other
text-heavy graphics. Higher contrast ratio
indicates that the projected image will be
crisp and clear with the greatest delineation
between black and white.
(18 pages)
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