Brightness Uniformity; Check Cross Talk (S); Color Temperature Adjustment - Philips 231P4QPYES/00 Service Manual

86 Meridian 4
5.4

Brightness uniformity

Set contrast at 100% and turn the brightness to get average above 300 nits at centre of the screen.
Apply the Fig 1, it should comply with the following formula:
Where B_max = Maximum brightness
B_min = Minimum brightness
5.5

Check Cross talk (S)

Apply Pattern 2. Set contrast and brightness at 100 %.
Measure YA. Then output Pattern 3 and measure YB.
the cross talk value :
5.6

Color temperature adjustment

There are three factory preset white color 9300K, 6500K, sRGB.
Apply full white pattern, with brightness in 100 % position and the contrast control at 50 % position.
The 1931 CIE Chromaticity (color triangle) diagram (x ,y) coordinate for the screen center should be:
CIE coordinates
11500K
9300K
8200K
7500K
6500K/sRGB
sRGB
5000K
( B_max - B_min )
B_max
ABS ( YA - YB )
 X 100% < 1.5 %
Product specification
x = 0.270 ± 0.02
y = 0.281 ± 0.02
x = 0.283 ± 0.02
y = 0.297 ± 0.02
x = 0.291 ± 0.02
y = 0.306 ± 0.02
x = 0.298 ± 0.02
y = 0.314 ± 0.02
x = 0.313 ± 0.02
y = 0.329 ± 0.02
x = 0.313 ± 0.02
y = 0.329 ± 0.02
x = 0.345 ± 0.02
y = 0.357 ± 0.02
X 100% > 75%
YA
(x,y)
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