Datasheet

CHAPTER 15 LCD CONTROLLER/DRIVER
388 User’s Manual U18698EJ1V0UD
(3) Output waveforms of common and segment signals
The voltages listed in Table 15-4 are output as common and segment signals.
When both common and segment signals are at the select voltage, a display on-voltage of ±V
LCD is obtained.
The other combinations of the signals correspond to the display off-voltage.
Table 15-4. LCD Drive Voltage
(a) Static display mode
Segment Signal Select Signal Level Deselect Signal Level
Common Signal LVSS/VLC0 VLC0/LVSS
VLC0/LVSS –VLCD/+VLCD 0 V/0 V
(b) 1/2 bias method
Segment Signal Select Signal Level Deselect Signal Level
Common Signal LVSS/VLC0 VLC0/LVSS
Select signal level VLC0/LVSS –VLCD/+VLCD 0 V/0 V
Deselect signal level VLC1 = VLC2 – VLCD/+ VLCD + VLCD/– VLCD
(c) 1/3 bias method
Segment Signal Select Signal Level Deselect Signal Level
Common Signal LVSS/VLC0 VLC1/VLC2
Select signal level VLC0/LVSS –VLCD/+VLCD – VLCD/+ VLCD
Deselect signal level VLC2/VLC1 – VLCD/+ VLCD + VLCD/– VLCD
(d) 1/4 bias method
Segment Signal Select Signal Level Deselect Signal Level
Common Signal VLC0/LVSS VLC1/VLC2
Select signal level LVSS/VLC0 +VLCD/–VLCD + VLCD/– VLCD
Deselect signal level VLC1/VLC3 + VLCD/– VLCD – VLCD/+ VLCD
1
2
1
2
1
2
1
2
1
3
1
3
1
3
1
3
1
3
1
3
1
4
1
4
1
2
1
2
1
4
1
4