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2.15 Luminance Uniformity
The variation in average display luminance between any area(with dimension approximate 2 cm of
diameter)on standard flat white screen, must be less than 35% of the luminance of the brightest area
with brightness control at cut-off and contrast control adjusted to 80 nits of luminance on the center of
screen.
2.16 Focus
When external contrast control is adjusted for 15+/-1FL light output with a flat white field pattern, then
switch to a character pattern filled with "H" characters, the characters shall be readable and disting
uishable.
2.17 Image Stability (Jitter)
Not perceivable Jitter will be present on the display, when displaying a cross-hatch pattern, at a
distance of 500 mm from the screen. In any case it is not admitted a measured Jitter value greater
than one dot (both on X axis or on Y axis).
2.18 Warm-Up Time
The warm-up time shall be 20 minutes maximum. At the end of the warm-up period, no adjustment or
service shall be necessary to cause the display to meet the requirements contained herein. After a
warm-up time of 1 minute, the display shall produce a usable image. Repetitive power ON/OFF
cycles must be possible with a minimum switch-off time of about 4s.
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