HD66789 Datasheet, PDF (112/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Preliminary
Configuration of Grayscale Amplifier
The eight levels (VIN0-7) of grayscale are determined by the gradient adjustment and fine adjustment
registers. The 8 levels are then divided into 32 levels (V0-31) by the ladder resistors placed between each
level.
VREG1OUT
Gradient
Adjustment
Register
PRP/N0 PRP/N1
3
3
Fine Adjustment Registers (6 x 3bits)
PKP/N0 PKP/N1 PKP/N2 PKP/N3 PKP/N4 PKP/N5
3
3
3
3
3
3
Amplitude
Adjustment
Register
VRP/N0 VRP/N1
45
VINP0/VINN0
V0
VINP1/VINN1
V1
V2
V3
VINP2/VINN2
V8
V9
VINP3/VINN3
V16
V17
VINP4/VINN4
V19
V20
VINP5/VINN5
V24
V25
V26
VINP6/VINN6
V30
VINP7/VINN7
V31
VGS
Grayscale amplifier
Rev.0.12, May 09 2003, page 112 of 156