UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 39

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

5.7
modulation plus four-frame rate control), from which four levels of gray scale can be selected and registered as the IC's
output gray-scale palette (refer to 6.23 Gary scale registers 1 to 4 (R23 to R26)).
5.7.1 Full-dot pulse width modulation
outputs in synch with the dot output timing based on the ratio (1/8 to 8/8 pulses) for the gray-scale palette that has been
selected via a command.
The PD16488A's pulse width modulator divides the normal LCD display signal's segment pulse width by eight and
PD16488A includes a full dot driver. The full dot driver has a 33-level gray-scale palette (eight levels of pulse width
SEG
COM
Caution There is no pulse width modulation for common outputs.
LCD Display Drivers
1
1
V
V
V
V
V
V
V
V
V
V
V
V
LCD
LCD
LC1
LC2
LC3
LC4
LC1
LC2
LC3
LC4
SS
SS
1 2 3 4 5 6 7 8
V
V
V
LCD
LC1
LC2
Figure 5-20. Full-Dot Pulse Width Modulation
1 frame
1
1/8
Data Sheet S15745EJ2V0DS
Enlarged section
4/8
6/8
8/8
90 91 92
2
1 2 3 4 5 6 7 8
3
90 91 92
PD16488A
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