Optical Characteristics; Test Conditions And Measurement Procedures; Measurement System Setup - Asus VW223 Service Manual

Service Manual ASUS VW223

3.3.3 Optical Characteristics

Test Conditions and Measurement Procedures

Note (1) Luminance , Chromaticity and CCT Measurement

Measurement System Setup:

The LCD module should be stabilized at given temperature for 20 minutes to avoid abrupt
temperature change during measuring. In order to stabilize the luminance, the measurement
should be executed after lighting Backlight for 20 minutes in a windless room.
Note (2) Definition of Contrast Ratio (CR):
The contrast ratio can be calculated by the following expression and figure below.
Contrast Ratio (CR) = L255 / L0
L255: Luminance of gray level 255
L 0: Luminance of gray level 0
CR = CR (1)
CR (X) is corresponding to the Contrast Ratio of the point X at Figure in Note (3).
Note(3): Definition of luminance measured points and Brightness Uniformity
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