White Balance - LG 32LC7D Service Manual

6.3 Adjustment of RGB
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925F Pattern Generator
(Which has XGA [1024*768] 60Hz 8 Color Bar pattern
shown in Fig. 1)
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768@60Hz 100% Color Bar pattern
(MSPG-925F model:37, pattern:33) into RGB.
(Using D-sub to D-sub cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment
G
4) Press the (Vol.+) key operate To set , then it becomes
automatically.
5) Auto-RGB OK means adjustment is completed.
* 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
∆uv
Medium CS-1000
x
y
∆uv
Warm CS-1000
x
y
∆uv
- PC (for communication through RS-232C)
-> UART Baud rate : 115200 bps
- Luminance Y AV : upper 150 cd/ß≥ (Typ : 350 cd/ß≥)
-> 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.
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
<Fig. 2> Connecting picture (On Automatic Control)
* 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 Module
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 Manual white Balance
- One of R Gain / G Gain / B Gain should be kept on 80, and
others are controlled lowering from 80
1) Press 'power on' of the control R/C, set heat run to white by
G
pressing , and heat run over 15 minutes. (Set : RS-233
Host : PC, Baud Rate : 115200bps, Download : Cortez)
2) Zero Calibrate CA-210, and when controlling, stick the
sensor to the center of LCD module surface.
3) Double click In-start key on Controlling R/C and get in 'white
balance'.
4) Set test-pattern on and display inside pattern. Control is
carried out on three color temperature, COOL, MEDIUM,
WARM. (Control is carried out three times,)
5) When the R/G/B GAIN is 80 on OSD, it is the FULL
DYNAMIC Range of the Module. In order to control white
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be kept
on 80, and other two is controlled lowering from 80.
* Color Temperature: Cool, Medium, Warm
1) When R GAIN is set to 80
- Control G GAIN and B GAIN by lowering from 80.
2) When B GAIN is set to 80
- Control R GAIN and G GAIN by lowering from 80.
3) When G GAIN is set to 80
- Control R GAIN and B GAIN by lowering from 80.
One of R Gain / G Gain / B Gain should be kept on 80,
and adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL DYNAMIC
Range of Module)
- 12 -
and Color Analyzer's Prove