HD66787 Datasheet, PDF (116/159 Pages) Renesas Technology Corp – 528-channel, One-chip Driver with 262,144-color Display RAM and Power Supply Circuit for Low-temperature Poli-Si TFT (LTPS-TFT) Panels with Incorporat

HD66787
Preliminary
γ-Correction Function
The HD66787 incorporates γ-correction function to simultaneously display 262,144 colors, by which 8-
level grayscale is determined by the gradient-adjustment and fine-adjustment registers. Select either
positive or negative polarity of the registers according to the characteristics of a liquid crystal panel.
Graphics RAM(GRAM)
MSB
LSB
Display
data
R5 R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B5 B 4 B 3 B 2 B 1 B 0
PKP 02 PKP 01 PKP 00
PKP 12 PKP 11 PKP 10
Positive
Polarity
Register
PKP 22 PKP 21 PKP 20
PKP 32 PKP 31 PKP 30
PKP 42 PKP 41 PKP 40
PKP 52 PKP 51 PKP 50
PRP 02 PRP 01 PRP 00
PRP 12 PRP 11 PRP 10
VRP 03 VRP 02 VRP01 VRP00
VRP14 VRP13 VRP12 VRP11 VRP10
8
PKN 02 PKN₀₁ PKN₀₀
PKN 12 PKN11 PKN10
Negative
Polarity
Register
PKN 22 PKN21 PKN20
PKN 32 PKN31 PKN30
PKN 42 PKN41 PKN40
PKN 52 PKN51 PKN50
PRN02 PRN01 PRN00
PRN12 PRN11 PRN10
VRN03 VRN02 VRN01 VRN00
VRN14 VRN13 VRN12 VRN11 VRN10
V0
6
V1
32
32-level grayscale
control
<R>
V31
FRC control
LCD driver
6
32-level grayscale
control _<G>
FRC control
LCD driver
6
32-level grayscale
control _<B>
FRC control
LCD driver
RGB
LCD
Grayscale control
Rev.0.22, May.23.2003, page 116 of 159