HD66781 Datasheet, PDF (157/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
γ-Correction Function
The HD66781 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. The HD66781
incorporates gradient-adjustment and fine-adjustment registers for both positive and negative polarities and
allows selecting either positive or negative polarity according to the characteristics of a liquid crystal panel.
GRAM
MSB
LSB
Display data _{R5 R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B5 B4 B3 B2 B1 B0}
+ polar register
PKP0[2:0]
PKP1[2:0]
PKP2[2:0]
PKP3[2:0]
PKP4[2:0]
PKP5[2:0]
PRP0[2:0]
PRP1[2:0]
VRP0[3:0]
VRP1[4:0]
- polar register
PKN0[2:0]
PKN1[2:0]
PKN2[2:0]
PKN3[2:0]
P KN4[2:0]
P KN5[2:0]
P RN0[2:0]
P RN1[2:0]
V RN0[3:0]
V RN1[4:0]
V0
V1
6
6
6
8
64
64 gray-scale
control
<R>
64 gray-scale
control
<G>
64 gray-scale
control
<B>
V63
LCD driver
LCD driver
LCD driver
RGB
L^LC^CD ^D
Grayscale control
Rev.0.5, July.31.2003, page 157 of 196