HD66740 Datasheet, PDF (56/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
VLCD
VLCD
VLCD
VLCD
VLCD
VR
VR
VR
VR
VR
V1
V1
V1
V1
V1
R
R
R
R
R
V2
V2
V2
V2
V2
R
R
R
R
R
V3
V3
V3
V3
V3
6R
5.5R
V4
5R
4R
3R
V4
V4
V4
V4
R
R
R
R
R
V5
V5
V5
V5
V5
R
R
R
R
R
GND
GND
GND
GND
GND
GND
i) 1/ 10 bias
(BS2–0 = 000)
GND
ii) 1/ 9.5 bias
(BS2–0 = 001)
GND
iii) 1/ 9 bias
(BS2–0 = 010)
GND
iv) 1/ 8 bias
(BS2–0 = 011)
GND
v) 1/7 bias
(BS2–0 = 100)
VLCD
VLCD
VR
VR
VLCD
V1
V1
R
R
VR
V2
V2
V1
R
V3
2R
V4
R
V3
R
V4
R
V2
R
V3,V4
R
V5
R
V5
R
V5
R
GND
R
GND
R
GND
Note: R = Reference resistor
GND
v) 1/6 bias
(BS2–0 = 101)
GND
v) 1/5 bias
(BS2–0 = 110)
GND
vi) 1/ 4 bias
(BS2–0 = 111)
Figure 28 Liquid Crystal Display Drive Bias Circuit
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