Sharp 4T-C70DK1X Service Manual page 12

4T-C70DK1X
A. WHITE BALANCE ADJUSTMENT.
White Balance Adjustment / Gamma Adjustment
NO.
ITEM
a) Setting
b) Auto
Adjustment
[command]
Adjustment
Mode
KRSW0001
KKT10037
Setting
OSDS0001
SBSL0016
Multi point
adj. Mode
MSET0000
WBI20255
Adj Point 2
WBI20229
MG2G****
MG2B****
MG2R****
Adj Point 1
WBI10040
MG1G****
MG1B****
MG1R****
Set
Max.Level
MGMG****
MGMR****
MGMB****
Write
MSET0003
CONDITION
For the details of white balance adjustment procedure, please refer to white balance
adjustment spec for Kameyama model.
AV Mode : DYNAMIC
Backlight : MAX
1. Confirm the set condition.
Set the luminance
2. Connect the white balance jig.
meter on the centre i. 3.5mm H/P Jack. ( 4 Pole Pin)
ii. RS-232 Cross cable ( 2 pcs ) + Convert wire from RS-232 D-Sub ( 9 pin to 3.5mm
of the screen
H/P Jack ( 4 Pole Pin ).
3. Through RS-232C command, adjustment mode screen is displayed.
Panel Contrast
R/G/B_MAX
Initial setting
R/G/B_HIGH
R/G/B_LOW
(1) Measurement MAX Brightness
(2) Set MIN Brightness
(3) Measurement HIGH Brightness
(4) Measurement LOW Brightness
(5) Calculation H
(6) Calculation L
HIGH luminance ( =2.2)
(7) Calculation
(8) Calculation Initial setting of
R/G/B_HIGH
(9) Set Initial setting of
R/G/B_HIGH
(10) Original WB adjustment is performed (HIGH)
Set the specified gradation for point 2, fix the
most faint colour to get reference value,
adjust others 2 colours to minus adjustment
for reference value of point 2.
(11) Measurement HIGH Brightness
(Set) R_HIGH= G_HIGH
G_HIGH= G_HIGH
B_HIGH= G_HIGH
(12) Calculation MAX luminance after WB
ADJ set to =2.2 (L
(13) Set R/G/B_MAX
LOW luminance ( =2.2)
(14) Calculation
(15) Calculation Initial setting of
R/G/B_LOW
(16) Set Initial setting of R/G/B_LOW
(17) Original WB adjustment is performed (LOW).
Adjust RB to the reference value of point 1.
(18) Adjusted value is writing at [command]
MSET0003
PROCEDURE
C
= 4000:1
nt
WB
= 4080
MAX
WB
H
= 3664/4080
WB
L
= 640/4080
L =305.7 cd/m²
max
L min = L max /C nt = 0.102
L =235.1 cd/m²
XH
L =2.06 cd/m²
XL
H =LOG((L -L
min
XH
L =LOG((L -L
min
XL
L =(L -L ) x (WB
max min
H22
WB =WB X ((L
HX MAX
R_HIGH=WB '=3703
HX
G_HIGH=WB '=3703
HX
B_HIGH=WB '=3703
HX
R_HIGH=3702
G_HIGH=3641
B_HIGH=3703
R_HIGH=3641
G_HIGH=3641
B_HIGH=3641
L =L /((W /WB
B
XMX XHG H
R_MAX=G_MAX*(R_HIGH/G_HIGH)=4078
)
XHG
G_MAX=WB X ((L
MAX
B_MAX=G_MAX*(B_HIGH/G_HIGH)=4078
L =(L -L ) x (WB
min
XLX XMX
WB =WB X ((L
LX MAX
R_LOW=WBXLX=901
G_LOW=WBXLX=901
B_LOW=WBXLX=901
R_LOW= 921
G_LOW=901
B_LOW=971
5 – 5
Example for adjustment method
(be careful of INT setting)
)/(L -L ))/LOG(WB /WB )= 2.44
max min
H MAX
) /(L -L ))/LOG(WB /WB
max min
L MAX
/WB )^2.2+L =241.31
min
H MAX
-L )/(L -L ))^(1/H )=3703
min max min
H22
RESULT
L 231.3
=
XHG
)^2.2)=293.04
MAX
-L )/(L -L ))^(1/H )=4010
min max min
XMX
/WB )^2.2+L =5.08
min
L MAX
-L )/(L -L ))^(1/L )=901
min max min
XLX
RESULT
)=2.73