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R61509V Target Spec
Rev. 0.11 April 25, 2008, page 142 of 181
γ Correction Function
γ Correction Function
The R61509V supports γ-correction function to make the optimal colors according to the characteristics of
the panel. The R61509V has registers for positive and negative polarities.
γ
Correction Circuit
The following figure shows the
γ
-correction circuit. According to the settings of variable resistors R0 to R8,
the voltage level, the difference between VREG1OUT and VGS, is evenly divided into 8 grayscale
reference voltages (V0, V1, V8, V20, V43, V55, V62, and V63). Other 56-grayscale voltages are
generated by setting the level at a certain interval between the reference voltages. For grayscale voltage,
see “Grayscale Voltage Calculation Formula”.
㪭㪇
㪭㪈
㪭㪏
㪭㪉㪇
㪭㪋㪊
㪭㪌㪌
㪭㪍㪉
㪭㪍㪊
Linear
interpolation
Interpolation
adjustment
Interpolation
adjustment
R: Resistor outputting voltage evenly divided into 12
(1R): Trimming step
2~33R (1R)
1~32R (1R)
2~33R (1R)
4~19R (1R)
8~23R (1R)
0~31R (1R)
1~32R (1R)
2~33R (1R)
4~19R (1R)
VGS (=GND)
R0
R1
R2
R3
R4
R5
R6
R7
R8
VREG1OUT
Figure 60