Philips 231B4LPYCB/00, Service Manual, Page: 89 / 100

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89 Meridian 2
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Factory requirements are taken into account.
It needs to do calibration to make sure the same detection distance.
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Service requirements are taken into account.
In the factory mode, it needs to reserve the max. distance adjustment value to adjust distance ranges.
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 q C
4.2 Brightness
Follow Panel specification.
4.3 Image size
Actual display size follow panel spec.
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 )