Image Size; Brightness Uniformity; Check Cross Talk (S); Color Temperature Adjustment - Philips 190CW9FB/69 Service Manual

68 190CW9 LCD
4.

Image size

Actual display size
4.4

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
4.5

Check Cross talk (S)

Apply Pattern 2. Set contrast and brightness at 100 %.
Measure YA. Then output Pattern 3 and measure YB.
the cross talk value :
4.6

Color temperature adjustment

There are six factory preset white color 11500K, 9300K, 8200K, 7500K, 6500K,
sRGB, 5000K
Align by Philips PerfecTune (also called FGA) function.
Apply full white 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:
Production alignment spec.
CIE coordinates
11500K
9300K
8200K
7500K
6500K/sRGB
General Product Specification
410.4 x 256.5mm
B_min
B_max
B_min = Minimum brightness
ABS ( YA - YB )
⎯⎯⎯⎯⎯⎯⎯⎯⎯ X 100% < 1.5 %
(x,y)
x = 0.270 ± 0.006
y = 0.281 ± 0.006
x = 0.283 ± 0.006
y = 0.297 ± 0.006
x = 0.291 ± 0.006
y = 0.306 ± 0.006
x = 0.298 ± 0.006
y = 0.314 ± 0.006
x = 0.313 ± 0.006
y = 0.329 ± 0.006
X 100% > 75% (Follow panel spec.)
YA