Philips 221B3LPCB/00, Service Manual

Page: 88 / 97

88 Meridian 3
4. Visual Characteristics
4.1 Test conditions
Unless otherwise specified, this specification is defined under the following conditions.
1) Input signal: As defined in 3.3, 1920 x 1080 non-interlaced mode (1920 x 1080 @60Hz), signal sources
must have 75 ohm output impedance.
2) Luminance setting: controls to be set to 300 nits with full screen 100 % duty cycle white signal
3) Warm up: more than 30 minutes after power on with signal supplied.
4) Ambient light: 400 -- 600 lux.
5) Ambient temperature: 20 ± 5

C
4.2 Brightness
Follow Panel specification.
4.3 Image size
Actual display size 337.920 (H) x 270.336 (V) mm
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:
( B_max - B_min )
X 100% > 75%
B_max
Where B_max = Maximum brightness
B_min = Minimum 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:
ABS (YA - YB)

X 100% < 1.5 %
YA
4.6 Color Temperature Adjustment
There are three factory preset white color 9300K, 6500K, sRGB.
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:
Product Specification
CIE coordinates (x, y)
11500K x = 0.270 ± 0.02 y = 0.281 ± 0.02 PerfecTune II
9300K x = 0.283 ± 0.02 y = 0.297 ± 0.02 PerfecTune II