Renesas R61509V User Manual

Page 142

R61509V

Target

Spec

Rev. 0.11 April 25, 2008, page 142 of 181

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

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)

VREG1OUT

Figure 60