Visual Characteristics; Test Conditions; Brightness; Image Size - Philips 231P4UPES/00 Service Manual

84 Meridian 4
It needs to do calibration to make sure the same detection distance.
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, follow panel resolution, signal sources must have 75 ohm output
(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
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
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 :
impedance.
: Follow panel spec.
( B_max - B_min )
B_max
ABS ( YA - YB )
X 100% > 75%
X 100% < 1.5 %