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| PCF8576D Datasheet, PDF (15/41 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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Philips Semiconductors
Universal LCD driver for low
multiplex rates
Product speciï¬cation
PCF8576D
6.4.4 1 : 4 MULTIPLEX DRIVE MODE
When four backplanes are provided in the LCD, the 1 : 4 multiplex drive mode applies (see Fig.10).
handbook, full pagewidth
BP0
BP1
BP2
BP3
Sn
Sn + 1
Sn + 2
Sn + 3
state 1
state 2
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
0V
âVLCD/3
â2VLCD/3
âVLCD
VLCD
2VLCD/3
VLCD/3
0V
âVLCD/3
â2VLCD/3
âVLCD
Tframe
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
Vstate1(t) = VSn(t) â VBP0(t)
Von(rms) = 0.577VLCD
Vstate2(t) = VSn(t) â VBP1(t)
Voff(rms) = 0.333VLCD
MGL749
Fig.10 Waveforms for the 1 : 4 multiplex drive mode.
2004 Dec 22
15
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