Philips 231E1HSB/00 Service Manual page 65

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
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:
Product specification:
Mode
OSD setting Temp.
Warm 6500K
Cool 9300K
User
50%
2
5
8
Spec : =< 1.33 (In all ranges)
1000:1
(FW)
Chromaticity Coordinate
x
0.313 ±0.020 0.329 ±0.020
0.313 ±0.015 0.329 ±0.015
0.313 ±0.005 0.329 ±0.005
0.283 ±0.020 0.298±0.020
0.283 ±0.015 0.298±0.015
0.283 ±0.005 0.298±0.005
Panel White x Panel White y
10%
3
6
9
Remark
y
For product Spec(DQA test)
For OQC Test:
For production alignment test
For product Spec(DQA test)
For OQC Test:
For production alignment test
65
231E LCD
10%
50%
90%