Mirage 2000 User Manual page 103

OPERATION
Achieving Brightness
Uniformity
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Mirage 22000/4000/6000User's Manual
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WHAT IS BRIGHTNESS UNIFORMITY?
for their primary colors (see Adjust Primary Colors, above) and overall light output,
proper adjustment of Brightness Uniformity can create an exceptionally smooth
screen in which:
•
no area of the screen appears more red, green or blue than another
•
no area of the screen appears brighter than another
•
color and light output from one screen closely matches adjacent screens
Although the Brightness Uniformity control can be used for a stand-alone projector, it
is particularly useful for setting up and maintaining tiled images that form a seamless
display wall in which the color "cast" and light output appear uniform throughout
each image as well as throughout the entire wall. The procedure provided here
assumes a multiple-screen application.
Before You Begin
Read through the entire procedure before attempting to adjust Brightness Uniformity
controls, and keep in mind the following checklist of prerequisites and guidelines:
USE PRIMARY COLORS—
as described in the "Matching Colors in Multiple Screens" procedure (above)
before attempting to work with Brightness Uniformity. This ensures that
primary colors, color temperature, and maximized light output are all well-
matched from one screen to another. These matches are needed before you can
achieve good Brightness Uniformity results.
RUN LAMP FOR 100 HOURS—
significantly during the first 100 hours of lamp use. For best results with new
lamps, either set up Brightness Uniformity after this period, or do an initial
setup and re-check at 100 hours.
SET LAMP POWER—
possible for your application while still maintaining a good overall match of
light output from screen-to-screen. By nature, achieving a uniform brightness
will then require a reduced overall brightness—this reduction will help ensure
that you have enough range of adjustment when examining brightness
variables more closely from screen-to-screen, and will help prevent premature
"maxing out" when trying to match to a certain color, zone or projector.
USE "USER 1" COLOR TEMPERATURE—
for the User 1 color temperature defined when you matched primary colors,
and continue to use it for all sources displayed on the wall. Your other color
temperatures will not necessarily be matched from screen-to-screen.
IGNORE THE COLOR OF MENUS—
are otherwise well-matched.
WHITE UNIFORMITY SLIDEBARS—
reduce to "0". Each slidebar adjusts overall light output in a specific screen
zone, but the value shown represents the current setting for green in this zone.
When other "hidden" values (red or blue) are lower than green, during
adjustment in the White Uniformity menu their values will reach "0" first,
causing the slidebar to stop earlier than expected.
JUDGE BY EYE OR USE A METER—
achieved with either.
When used to refine screens already matched
Always activate and adjust the primary colors control
Light output and Brightness Uniformity can vary
Make sure each "Lamp Power" setting is as high as
Always adjust Brightness Uniformity
Menu color will vary between screens that
White Uniformity slidebar values may not
Good brightness uniformity can be