Philips 190EW9FB 00 Service Manual page 59

Where B_max = Maximum brightness
B_min = Minimum brightness
8.10 White Uniformity
Definition of White Variation (W):
Measure the luminance of gray level 255 at 9 points
W = Maximum [L(1), L(2) ...... L(9)] / Minimum [L(1), L(2) ...... L(9)]
90%
1
4
7
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:
8.12 White color adjustment
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:
Mode
OSD setting
Warm
Cool
B_min
X 100%>75%
B_max
Spec : =< 1.33 (In all ranges)
1000:1
Chromaticity Coordinate
Temp. x
0.313 ±0.020
6500K
0.313 ±0.015
0.313 ±0.005
9300K 0.283 ±0.020
50%
2
5
8
y
0.329 ±0.020
0.329 ±0.015
0.329 ±0.005
0.298±0.020
190EW9 LCD
10%
10%
3
6 50%
9 90%
Remark
For product Spec(DQA test)
For OQC Test:
For production alignment test
For product Spec(DQA test)
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