NEC mPD71312 User Manual page 30

(3) Output waveforms of common and segment signals
The voltages listed in Table 3-5 are output as common and segment signals.
When both common and segment signals are at the select voltage, a display on-voltage of ±V
The other combinations of the signals correspond to the display off-voltage.
Common Signal
V /LV
LC0 SS
Common Signal
Select signal level
Deselect signal level
Common Signal
Select signal level
Deselect signal level
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CHAPTER 3 LCD CONTROLLER/DRIVER
Table 3-5. LCD Drive Voltage
(a) Static display mode
Segment Signal Select Signal Level
–V /+V
LCD LCD
(b) 1/2 bias method
Segment Signal Select Signal Level
V /LV –V /+V
LC0 SS LCD LCD
1 1
V = V – V /+
LC1 LC2 LCD
2 2
(c) 1/3 bias method
Segment Signal Select Signal Level
V /LV –V /+V
LC0 SS LCD LCD
1 1
V /V – V /+
LC2 LC1 LCD
3 3
User's Manual U18438EJ2V0UD
LV /V
SS LC0
0 V/0 V
LV /V
SS LC0
0 V/0 V
1
V +
LCD
2
LV /V
SS LC0
1
–
3
1
V –
LCD
3
is obtained.
LCD
Deselect Signal Level
V /LV
LC0 SS
Deselect Signal Level
V /LV
LC0 SS
1
V /– V
LCD LCD
2
Deselect Signal Level
V /V
LC1 LC2
1
V /+ V
LCD LCD
3
1
V /+ V
LCD LCD
3