LG RD-JT50 Service Manual - Page 26

Adjust Gamma Index and Red/Green/Blue Gamma to fit mars video gamma

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Page 26 highlights

III. Gamma Curve: 1. Change Timing and pattern of pattern generator: Timing: NTSC (H: 15.73 KHz, V: 29.96 Hz) Pattern: 100% blue 2. Adjust Gamma Index and Red/Green/Blue Gamma to fit mars video gamma curve. (B) YPbPr Component: Equipment: - Pattern generator (VG-828) - Lux meter (CL-100) OSD Default value: Item Value Item Value Brightness Contrast Filter 0 Brightness Bias 0 Contrast Bias 1 Pb offset Adjustable Adjustable Adjustable CM-Red-CF1/2 128/128 Pr offset Adjustable CM-Green-CF1/2 128/128 CM-Blue-CF1/2 Red Gain 128/128 128 Green Gain 128 Blue Gain 128 White Peak Gamma Table 2 Linear Procedure: I. Offset adjustment: 1. Black coordinate spec: Osram lamp Oshio lamp X0 0.281 0.01 0.313 0.01 Y0 0.311 0.01 0.329 0.01 2. The variance of color coordinate via Pb offset and Pr offset: X y Pb offset x y Pb offset x y Pr offset x y Pr offset x y 3. If we line the x and y, then the Pb offset is the shift action and the Pr offset is the rotational action. 4. Connect power, YPbPr Video into projector. 26

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26
III. Gamma Curve:
1.
Change Timing and pattern of pattern generator:
Timing: NTSC (H: 15.73 KHz, V: 29.96 Hz)
Pattern: 100% blue
2.
Adjust Gamma Index and Red/Green/Blue Gamma to fit mars video gamma
curve.
(B) YPbPr Component:
Equipment:
-
Pattern generator (VG-828)
-
Lux meter (CL-100)
OSD Default value:
Item
Value
Item
Value
Brightness
0
Brightness Bias
Adjustable
Contrast
0
Contrast Bias
Adjustable
Filter
1
Pb offset
Adjustable
CM-Red-CF1/2
128/128
Pr offset
Adjustable
CM-Green-CF1/2
128/128
CM-Blue-CF1/2
128/128
Red Gain
128
Green Gain
128
Blue Gain
128
White Peak
2
Gamma Table
Linear
Procedure:
I.
Offset adjustment:
1.
Black coordinate spec:
Osram lamp
Oshio lamp
X0
0.281
0.01
0.313
0.01
Y0
0.311
0.01
0.329
0.01
2.
The variance of color coordinate via Pb offset and Pr offset:
X
y
Pb offset
x
y
Pb offset
x
y
Pr offset
x
y
Pr offset
x
y
3.
If we line the x and y, then the Pb offset is the shift action and the Pr offset is
the rotational action.
4.
Connect power, YPbPr Video into projector.