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UPD16488AP Datasheet(PDF) 45 Page - NEC

Part # UPD16488AP
Description  1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
PDF  91 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD16488AP Datasheet(HTML) 45 Page - NEC

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Data Sheet S15745EJ2V0DS
45
µµµµPD16488A
5.7.3 Line shift driver
If the frame rate control is performed with equal pulse widths and the same gray scale is displayed on the LCD's full
screen, problems such as flickering may occur on the LCD panel. The
µPD16488A provides a line shift driver as a
countermeasure against such screen image problems.
Using 8 frames per cycle, the segment PWM output timing is shifted among the common outputs, as shown in Table 5-16
below.
Table 5-16. Line Shift Driver
Turn 1
Turn 2
Frame
1
2345
6781
2345
6781
234
COM1
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
COM2
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
COM3
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
COM4
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
COM5
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
COM6
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
COM7
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
COM8
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
COM9
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
COM10
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
F1
F2
F3
F4
F5
F6
F7
F8
•
•
••••
••••
••••
••••
•••
Remark Fx: Pulse width modulated output frame (See 5.7.2 Full-dot frame rate control).
Figure 5-22. Full Dot Frame Rate Control
1234
5
1
2
15
3
1
7
3
7
5
6
2
8
15
3
1
7
3
7
5
6
2
8
15
3
1
7
3
7
5
6
2
8
15
3
1
7
3
7
5
6
2
8
15
3
1
7
3
7
5
6
2
8
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SEG1
SEG2
SEG3
SEG4
SEG5
COM1
COM2
COM3
COM4
COM5
COM91
COM92
First frame
Second frame
91
92
Remark Numerical values in the segment data correspond to the gray-scale palette's frame numbers.



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