HD66724 Datasheet, PDF (76/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
V LCD
V LCD
V LCD
V LCD
VR
R
R
2.5R
R
R
VR
V1
R
V2
R
V3
2R
V4
R
V5
R
GND
V1
V2
V3
V4
V5
GND
VR
R
R
1.5R
R
R
VR
V1
R
V2
R
V3
R
V4
R
V5
R
GND
V1
V2
V3
V4
V5
GND
GND
i) 1 / 6.5 bias
(BS2-0 = 000)
V LCD
VR
R
R
0.5R
R
R
V1
V2
V3
V4
V5
GND
GND
v) 1 / 4.5 bias
(BS2-0 = 100)
GND
ii) 1 / 6 bias
(BS2-0 = 001)
GND
iii) 1 / 5.5 bias
(BS2-0 = 010)
GND
iv) 1 / 5 bias
(BS2-0 = 011)
V LCD
VR
V1
R
V2
R
V3,V4
R
V5
R
GND
GND
vi) 1 / 4 bias
(BS2-0 = 101)
Note: R=Reference resistor
Figure 41 Liquid Crystal Display Drive Bias Circuit
76