BU91797MUF-M Datasheet, PDF (14/27 Pages) Rohm – Low Duty LCD Segment Driver for Automotive application

BU91797MUF-M MAX 144 segments (SEG36×COM4)
Datasheet
(1/2bias)
Line Inversion
SEGn SEGn+1 SEGn+2 SEGn+3
COM0
stateA
COM1
stateB
COM2
COM3
Frame Inversion
SEGn SEGn+1 SEGn+2 SEGn+3
COM0
stateA
COM1
stateB
COM2
COM3
VDD
COM0
COM1
VLCD
VDD
VLCD
VDD
COM2
VLCD
VDD
COM3
VLCD
VDD
SEGn
VLCD
VDD
SEGn+1
VLCD
VDD
SEGn+2
VLCD
VDD
SEGn+3
VLCD
stateA
(COM0-SEGn)
(VDD-VLCD)
1/2 (VDD-VLCD)
0
-1/2 (VDD-VLCD)
-(VDD-VLCD)
stateB
(COM1-SEGn)
(VDD-VLCD)
1/2 (VDD-VLCD)
0
-1/2 (VDD-VLCD)
-(VDD-VLCD)
1frame
Figure 16. LCD Waveform in Line Inversion (1/2bias)
VDD
COM0
COM1
VLCD
VDD
COM2
VLCD
VDD
VLCD
VDD
COM3
VLCD
VDD
SEGn
VLCD
VDD
SEGn+1
VLCD
VDD
SEGn+2
VLCD
VDD
SEGn+3
VLCD
stateA
(COM0-SEGn)
(VDD-VLCD)
1/2 (VDD-VLCD)
0
-1/2 (VDD-VLCD)
-(VDD-VLCD)
stateB
(COM1-SEGn)
(VDD-VLCD)
1/2 (VDD-VLCD)
0
-1/2 (VDD-VLCD)
-(VDD-VLCD)
1frame
Figure 17. LCD Waveform in Frame Inversion (1/2bias)
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