LG 55LH55 Service Manual page 8

7. Chroma& Brightness
7.1 Module optical specification
No. Item
1. Max Luminance
(Center1-point/ Ful white pattern)
2. Luminance uniformity
3. Contrast Ratio
4. Color Coordinates
5. Color Temperatue
6. Color Distortion, DG
7. Color Distortion,DP
8. Color S/N,AM/FM
9. Color Killer Sensitivity
7.2Max Luminance &Contrast measure standard specification
- Max Luminance measure specification
1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument: CA-210 or a sort of Color Analyzer.
3) Pattern Generator :VG- 828 or a sort of digital pattern generator (displayable Full White &1/25 White Window pattern)
4) Measure condition
• Test pattern: in center,1/5(H)*1/5(V) of Window Pattern (white pattern in non-impressed condition)
• SET condition: Contrast &Brightness Level 100%
• Environment condition : Dark room in the non outside light
• Video menu option condition
Signal
RF NTSC-M
AV NTSC-J
Component 720P
RGB 1024x768
HDMI DTV 720P
5) Measurement
• Do heat-run LCD module at 30minutes in normal temperature (25°C)by using full white pattern of 15%signal level(38 gray level).
• Impress test pattern signal in 1/5(H)*1/5(V)White Window of 100%(255Gray Level)
• measure 3 times brightness of central white window,and mark peak brightness in max brightness degree
• measure the same condition in video signal /RGB signal.
- Luminance uniformity measure specification
1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 5 points.
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Only for training and service purposes
Specification Min.
Modele
400
Luminance
1000: 1
40000: 1(DCR) 50000:1(DCR)
WX Typ
White
WY -0.03
Xr
RED
Yr
Xg
Green
Yg
Xb
Blue
Yb
Typ
Cool
-0.015
Medium
Warm
43.0
Picture Mode Dynamic Contrast
Vivid High
Vivid High
Vivid High
Vivid High
Vivid High
- 8 -
Typ.
500
77
1300: 1
0.279
0.292
0.637
0.333
0.287
0.605
0.145
0.064
0.276
+0.015
0.283
0.285
0.293
0.313
0.329
-80
Dynamic Color Black Level
High
High
High
NA
High
Max. Remark
cd/m 2
Typ
+0.03
Typ
85% Full white pattern
**The W/B Tolerance is
± 0.015 for Adjustment
Dynamic contrast :off
Dynamic color :off
Energy saving mode :off
10.0 %
10.0 deg
dB
dB
OPC
Low Off
High Off
High Off
NA Off
Low Off
LGE Internal Use Only