HD66730 Datasheet, PDF (112/131 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display

HD66730/HD66731
1/27 Duty Cycle (DT1/0 = 01: 2-Line Drive)
1-line selection period
V_CC
V1
COM1
V4
V5
1 234
26 27 1
1 frame
(Number of dots per screen)
23
26 27
1 frame
(Number of dots per screen)
Figure 43 Frame Frequency (1/27 Duty Cycle)
Table 25 1/27 Duty Drive
Number of Display Lines:
(NL1/0 Set Value):
Number of display characters
(NC1/0 set value)
1-line selection period (dot)
Number of dots per screen (dot)
Oscillation frequency (kHz)*
6 characters
(00)
72 dots
1944 dots
135
2-Line Display
(01)
10 characters
(01)
120 dots
3240 dots
225
20 characters
(11)
240 dots
6480 dots
475
Number of Display Lines:
4-Line Display
(NL1/0 Set Value):
(11)
Number of display characters
6 characters
10 characters
(NC1/0 set value)
(00)
(01)
1-line selection period (dot)
72 dots
120 dots
Number of dots per screen (dot)
1944 dots
3240 dots
Oscillation frequency (kHz)*
135
225
Note: * The frequencies in Table 24 are examples when the frame frequency is set to 70 Hz. Adjust the
oscillation frequency so that an optimum frame frequency can be obtained.
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