cxa1853q Sony Electronics, cxa1853q Datasheet - Page 26

• Manufacturer Part Number: cxa1853q
• Description: Rgb Driver For Lcd
• Manufacturer: Sony Electronics

White Side Gamma Measurement Method
Measure the output voltages y
signal. (Measure the voltage from the reference level. Label the white side from the reference level as positive,
and the black side as negative.)
Select the two points where | y
label the input voltages which correspond to y
Next, measure the output voltages y
input signal.
Select the two points where | y
label the input voltages which correspond to y
From the above:
The white side gamma gain is defined as the ratio of the maximum gain to the minimum gain. In other words:
The gamma breakpoint is defined as the intersection between the straight line passing through points (a
and (a
Reference level
k – 1
Maximum gain GM = (y
Minimum gain GN = (y
Gamma gain = 20 log (GM/GN)
Gamma breakpoint = (GM
, y
k – 1
RGB output waveform (SG8)
) and the straight line passing through points (a
y1
y2
y3
y4
y5
1
h
n
n
k
to y
– y
– y
– y
y6
– y
h – 1
n – 1
n – 1
y7
10
k – 1
1
GN
to y
which correspond to the input voltages a
)/(a
y8
)/(a
| (n = 2 to 10) is a maximum, and label these points y
| (n = 2 to 10) is a maximum, and label these points y
10
h
y9 y10
(a
k
– a
– a
which correspond to the input voltages a
k
k
h
– a
h – 1
and y
and y
k – 1
h
) – GN
)
)
– 26 –
k – 1
h – 1
as a
as a
Reference level
y
k
k
h
+ GM
and a
and a
h
, y
h
) and (a
RGB output waveform (SG9)
k – 1
h – 1
y
h
y1
, respectively.
)/(GM – GN)
, respectively.
y2 y3
h – 1
, y
1
y4 y5 y6 y7 y8 y9 y10
h – 1
to a
). In other words:
10
1
to a
using SG9 as the input
10
using SG8 as the
h
k
and y
and y
h – 1
k – 1
CXA1853Q
. Also,
. Also,
k
, y
k
)