Sharp 2T-C45AE1X Service Manual page 10

2T-C45AE1X
WHITE BALANCE ADJUSTMENT/ GAMMA ADJUSTMENT
4.
ITEM
NO.
a) Setting AV Mode : DYNAMIC
Backlight : MAX
Set the luminance
meter on the centre
of the screen
b) Auto
Adjustment
Initial setting
(1)
[command] (2)
Adjustment (3)
Mode
(4)
KRSW0001
KKT10037
(5)
(6)
Setting
KYOF0001
(7)
OSDS0001
SBSL0016
(8)
Multi point
(9)
adj. Mode
MSET0000
(10) Original WB adjustment is performed (HIGH)
WBI20255
Adj Point 2
WBI20229 (11) Measurement
MG2G****
MG2B****
MG2R****
Adj Point 1
(12) Calculation
WBI10040
MG1G****
MG1B**** (13) Set
MG1R****
(14) Calculation
(15) Calculation
Write
(16) Set Initial setting of R/G/B_LOW
MSET0003
White Balance Adjustment / Gamma Adjustment
CONDITION
For the details of white balance adjustment procedure, please refer to white balance
adjustment spec for Kameyama model.
1. Confirm the set condition.
2. Connect the white balance jig.
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
H/P Jack ( 4 Pole Pin ).
3. Through RS-232C command, adjustment mode screen is displayed.
Panel Contrast
R/G/B_MAX
R/G/B_HIGH
R/G/B_LOW
Measurement MAX Brightness
Set MIN Brightness
Measurement HIGH Brightness
Measurement LOW Brightness
H γ
Calculation
Calculation Lγ
Calculation HIGH luminance (γ=2.2)
Calculation Initial setting of
R/G/B_HIGH
Set Initial setting of
R/G/B_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.
HIGH Brightness
(Set) R_HIGH= G_HIGH
G_HIGH= G_HIGH
B_HIGH= G_HIGH
MAX luminance after WB
ADJ set to γ=2.2 (L
R/G/B_MAX
LOW luminance (γ=2.2)
Initial setting of
R/G/B_LOW
.
PROCEDURE
C
= 4800:1
nt
WB
= 4080
MAX
WB
H
= 3664/4080
WB
L
= 640/4080
L =305.7 cd/m²
max
L = L /C = 0.102
min max nt
L =235.1 cd/m²
XH
L =2.06 cd/m²
XL
Hγ =LOG((L -L min
XH
Lγ =LOG((L -L min
XL
L =(L -L ) x (WB
max min
H22
WB =WB X ((L
HX MAX
ʼ=3703
R_HIGH=WB
HX
ʼ=3703
G_HIGH=WB
HX
B_HIGH=WB ʼ=3703
HX
R_HIGH=3702
G_HIGH=3641
B_HIGH=3703
R_HIGH=3641
G_HIGH=3641
B_HIGH=3641
L =L /((W B
XMX XHG H
R_MAX=G_MAX*(R_HIGH/G_HIGH)=4078
)
XHG
G_MAX=WB
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=WB =901
XLX
G_LOW=WB =901
XLX
B_LOW=WB =901
XLX
5 – 3
Example for adjustment method
(be careful of INT setting)
)/(L max -L min ))/LOG(WB /WB
H MAX
) /(L max -L min ))/LOG(WB /WB
L
/WB )^2.2+L =241.31
min
H MAX
-L )/(L -L ))^(1/H γ )=3703
min max min
H22
RESULT
L 231.3
=
XHG
/WB )^2.2)=293.04
MAX
X ((L -L min )/(L max -L min ))^(1/Hγ )=4010
XMX
/WB )^2.2+L =5.08
min
L MAX
-L )/(L -L ))^(1/Lγ )=901
min max min
XLX
RESULT
)= 2.44
)=2.73
MAX