PEDL9041A-02
OKI Semiconductor
ML9041A-xxA/xxB
LCD Drive Waveforms
The COM and SEG waveforms (AC signal waveforms for display) vary according to the duty (1/9, 1/12 and 1/17
duties). See 1) to 3) below.
The relationship between the duty ratio and the frame frequency is as follows:
Duty ratio
1/9
Frame Frequency
75.0 Hz
1/12
56.3 Hz
1/17
79.4 Hz
Note:
At an oscillation frequency (OSC) of 270 kHz
1) COM and SEG Waveforms on 1/9 Duty
CSR = “H” 2
CSR = “L” 8
1
9
9
1
8
2
7
3
6
4
3
7
2
8
1
9
9
1
8
2
7
3
6
4
3
7
2
8
1
9
9
1
8
2
···
···
···
···
COM1 (CSR = “L”, AS = “L”)
COM2 (CSR = “L”, AS = “H”)
COM9 (CSR = “H”, AS = “L”)
COM8 (CSR = “H”, AS = “H”)
(first character line)
VDD
V1
V2, V3B
V4
V5
1 frame
COM2 (CSR = “L”, AS = “L”)
COM3 (CSR = “L”, AS = “H”)
COM8 (CSR = “H”, AS = “L”)
COM7 (CSR = “H”, AS = “H”)
(second character line)
VDD
V1
V2, V3B
V4
V5
COM8 (CSR = “L”, AS = “L”)
COM9 (CSR = “L”, AS = “H”)
COM2 (CSR = “H”, AS = “L”)
COM1 (CSR = “H”, AS = “H”)
(cursor line)
VDD
V1
V2, V3B
V4
V5
COM9 (CSR = “L”, AS = “L”)
COM1 (CSR = “L”, AS = “H”)
COM1 (CSR = “H”, AS = “L”)
COM9 (CSR = “H”, AS = “H”)
(arbitrator line)
VDD
V1
V2, V3B
V4
V5
VDD
V1
V2, V3B
V4
COM10 to
COM17
V5
Display
turning-off
waveform
VDD
V1
SEG
V2, V3B
V4
V5
Display
turning-on
waveform
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