Philips 273E3QHSB/93 Service Manual page 72

Meridian 3
72
Brightness
Follow Panel specification.
Image size
Actual display size
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
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 :
Color temperature adjustment
There are six factory preset white color 11500K,9300K,8200K,7500K 6500K,5000K
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:
9300K
6500K/sRGB
sRGB
CIE coordinates
9300K
6500K/sRGB
sRGB
: Follow panel spec.
( B_max - B_min )
B_max
B_min = Minimum brightness
ABS ( YA - YB )
CIE coordinates
Production alignment spec.
x = 0.283 ± 0.006
y = 0.297 ± 0.006
x = 0.313 ± 0.006
y = 0.329 ± 0.006
x = 0.313 ± 0.006
y = 0.329 ± 0.006
X 100% > 75%
X 100%
YA
Product specification
(x,y)
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
(x,y)
< 1.5 %
PerfecTune II
PerfecTune II
PerfecTune II
PerfecTune II
PerfecTune II
PerfecTune II