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| PCF85162 Datasheet, PDF (14/46 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCF85162
Universal LCD driver for low multiplex rates
7.4.4 1:4 Multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies as
shown in Figure 10.
PCF85162
Product data sheet
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
Tfr
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
013aaa211
Vstate1(t) = VSn(t) ï VBP0(t).
Von(RMS) = 0.577VLCD.
Vstate2(t) = VSn(t) ï VBP1(t).
Voff(RMS) = 0.333VLCD.
Fig 10. Waveforms for the 1:4 multiplex drive mode with 1â3 bias
All information provided in this document is subject to legal disclaimers.
Rev. 3 â 16 June 2011
© NXP B.V. 2011. All rights reserved.
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