Philips 220VW8FB/00 Service Manual page 68

220VW8 LCD 68
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 gray64 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:
8.13 Distance between TFT LCD monitor and CRT/TFT monitor
Conducted with different modes or frequencies. No interference in a distance down to 25 cm.
9. ENVIRONMENT
9.1 Environmental conditions
Product spec.
9300K CIE coordinates
6500K/ sRGB CIE coordinates
sRGB CIE coordinates
50%
2
5
8
1000:1
X = 0.283 ± 0.02
Y = 0.297 ± 0.02
X = 0.313 ± 0.02
Y = 0.329 ± 0.02
X = 0.313 ± 0.02
Y = 0.329 ± 0.02
10%
10%
3
6 50%
9 90%