Newton Ring; Brightness; Brightness Uniformity; White Uniformity - Philips 200WS8FS/00 Service Manual

200WS8 LCD 76
2 adjacent lit sub-pixels
3 adjacent lit sub-pixels (one white pixel)
Distance between two bright dots
Bright dot defects within 20 mm circle
Total bright dot defects of all type
1 dark sub-pixel
2 adjacent dark sub-pixels
3 adjacent dark sub-pixels (one white pixel)
Distance between two black dots
Black dot defects within 20 mm circle*
Total black dot defects of all type
Total bright or black dot defects of all type
8.8

Newton Ring

No Newton Rings visible.
8.9 Luminance Output
8.9.1 Luminance Output
Test resolution:
Test condition:
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:
Where B_max = Maximum brightness
B_min = Minimum brightness
8.10

White Uniformity

Definition of White Variation
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)]
BLACK DOT DEFECTS
MODEL
TOTAL DOT DEFECTS
MODEL
B_min
X 100%>75%
B_max
W):
15mm
ACCEPTABLE LEVEL
200WS8
15mm
ACCEPTABLE LEVEL
200WS8
1680 x 1050 at 60 Hz
video input (RGB) = maximum white
1
0
0
3
5
2
1
1
5
5