upd161608 Renesas Electronics Corporation., upd161608 Datasheet - Page 50

• Manufacturer Part Number: upd161608
• Description: 176-rgb X 220-dot 1-chip Driver Ic For 262,144-color Tft-lcd Display
• Manufacturer: Renesas Electronics Corporation.

15. STRUCTURE OF GRAY-SCALE AMPLIFIER
and EXVR are determined by the gray-scale adjustment register and the micro adjustment register. Each level is split into
8 levels again by the internal ladder resistor network. As a result, gray-scale amplifier generates 64 voltage levels ranging
from V0-V63 and outputs one of 64 levels. A gamma adjustment executed by the LCD panel respectively.
50
The structure of gray-scale amplifier is shown as below. 8-voltage-level (VINP0/VINP7-VINN0/VINN7) between VLCD63
VLCD63
EXVR
PRP/N0, PRP/N1 PKP/N0 PKP/N1 PKP/N2 PKP/N3 PKP/N4 PKP/N5 VRP/N0 VRP/N1
adjustment
Gradient
3
Figure 15−1. Structure of Gray-scale Amplifier
3
selector
8 to 1
3
Micro adjustment register (6 x 3-bit)
selector
8 to 1
Data Sheet S17594EJ2V0DS
3
selector
8 to 1
3
selector
8 to 1
3
selector
8 to 1
3
selector
8 to 1
3
adjustment
Amplitude
4
/VINN0
/VINN1
/VINN2
/VINN3
/VINN4
/VINN5
/VINN6
/VINN7
5
VINP0
VINP1
VINP2
VINP3
VINP4
VINP5
VINP6
VINP7
μ
PD161608
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
20
21
43
44
55
56
57
62
63
0
1
2
3
8
9