200VW8 LCD
70
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
8.10White 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)]
90% | 50% | 10% |
1 | 2 | 3 |
4 | 5 | 6 |
7 | 8 | 9 |
10%
50%
90%
Spec : =< 1.33 (In all ranges)
8.11Contrast 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 |
8.12White 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: