LG 50PG6300 Service Manual page 11

7.3.3 Contrast ratio measure specification
1) Test display signal : 30*30 dots White Window signal & all Black Raster signal
2) Dark room measure condition : Using touch type Color analyzer CA-100+(or CS-1000, CA-210) Dark
room in the non outside light.
3) Bright room measure condition : In bright room of 150Lx illumination in the panel surface, locate a
source of light on the above 45˚of the panel surface.
4) Measure method (from 42G1 CAS)
a. The brightness of the white peak(Lw) position is measured while the 1%-window pattern is "ON"
state. And then, it should be checked in 10 seconds after 1%-window is "ON"state.
The brightness of the black(Lb) is measured any point(Min.data) of panel.
b. The brightness of dark room is less than 1 lux.
Contrast ratio = Lw / Lb
If it does not use Prior measurement, use generally simple test measurement.
The Correct measure specification is followed by IEC61988-2/CD, JAPAN EIAJ-2710
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