White Balance - LG 22LS4D Service Manual

* Before White-balance, the AV ADC should be done.

7. White Balance

* Test Equipment
Color Analyzer (CA-210/CH.9)
-> When you adjust LCD color temperature, on Color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised) by
CS-1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
* Color temperature standards according to CSM and Module
Cool : 11,000k
Medium : 9,300k
Warm : 6,500k
* White balance adjustment coordinate and color temperature
Cool CS-1000
x
y
Δuv
Medium CS-1000
x
y
Δuv
Warm CS-1000
x
y
Δuv
- PC (for communication through RS-232C)
-> UART Baud rate : 115200 bps
- Luminance Y AV : upper 100 cd/m
-> Applying to Cool, Medium, Warm mode
* Connecting picture of the measuring instrument (On
Automatic control )
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START
-> Enter the mode of White-Balance, the pattern will come
out.
<Fig. 2> Connecting picture (On Automatic Control)
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CA-210(CH 9)
0.276 0.276±0.002
0.283 0.283±0.002
0.000 0.000
CA-210(CH 9)
0.285 0.285±0.002
0.293 0.293±0.002
0.000 0.000
CA-210(CH 9)
0.313 0.313±0.002
0.329 0.329±0.002
0.004 0.004
2 (Typ : 250 cd/m
* Auto adjustment Map (RS-232C)
Type
Baud Rate
115200
Index
R-Gain_Normal
G-Gain_Normal
B-Gain_Normal
R-Gain_Warm
G-Gain_Warm
B-Gain_Warm
R-Gain_Cool
G-Gain_Cool
B-Gain_Cool
R-Offset_Normal
G-Offset_Normal
B-Offset_Normal
R-Offset_Warm
G-Offset_Warm
B-Offset_Warm
R-Offset_Cool
G-Offset_Cool
B-Offset_Cool
Internal Pattern signal
Internal Pattern signal
Internal Pattern signal
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2) Adhere closely the Color Analyzer ( CA-210 ) to the
module less than 10cm distance, keep it with the surface
of the
2 ) vertically.(80~100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
- Using 'no signal' or 'full white pattern' or the others,
check the back light on.
7.1. Auto white Balance
(Set:RS-232, Host:PC, Baud Rate:115200bps, Download:Cortez)
Inside pattern is used when balance is controlled.
Connect as below figure and click the start button on W/B
execution program.
W/B is automatically processing Cool --> Medium --> Warm in
order.
When W/B is completed, you can see 'OK' on PC monitor.
- 12 -
LD73B
Data bit Stop bit
8 1
Cmd 1 Cmd 2 Data Min Value Max Value
j a 00(00)
j b 00(00)
j c 00(00)
j d 00(00)
j e 00(00)
j f 00(00)
j g 00(00)
j h 00(00)
j i 00(00)
l j 00(00)
l k 00(00)
l l 00(00)
l m 00(00)
l n 00(00)
l o 00(00)
l p 00(00)
l q 00(00)
l r 00(00)
w b 00 Starting W/B ADJ
w b 10 Using internal Pattern
w b ff Ending W/B ADJ
Module and Color Analyzer's
LGE Internal Use Only
Parity
None
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
128(80)
Prove