Philips 220CW8FB/00 - Page 78

Test resolution: 1680 x 1050 at 60 Hz
Test condition: video input (RGB) = maximum white
8.9.2 Brightness
To follow Panel specification. sRGB = 80 ± 10 nits.
8.9.3 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:
B_min
X 100%>75%
B_max
Where B_max = Maximum brightness
B_min = Minimum brightness
8.10 White Uniformity
Definition of White Variation (δW):
Measure the luminance of gray level 255 at 9 points
δW = Maximum [L(1), L(2) …… L(9)] / Minimum [L(1), L(2) …… L(9)]
Spec : =< 1.33 (In all ranges)
8.11 Contrast ratio
The contrast ration can be calculated by following expression.
Contrast Ratio (CR) = L255 / L0
L255 : Luminance of gray level 255
L0 : Luminance of gray level 0
Typical value: 1000:1
8.12 White color adjustment
There are three factory preset white color 9300K, 6500K, sRGB.
Apply full gray 64 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:
78 220CW8 LCD
9
2
4 5
6
7 8
1 3
10%
50%
90%
10%
50%
90%
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