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| PCA85176 Datasheet, PDF (12/44 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCA85176
Universal LCD driver for low multiplex rates
7.4.3 1:3 Multiplex drive mode
When three backplanes are provided in the LCD, the 1:3 multiplex drive mode applies, as
shown in Figure 8.
BP0
BP1
BP2
Sn
Sn+1
Sn+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
state 1
state 2
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.
013aaa210
Fig 8.
Vstate1(t) = VSn(t) â VBP0(t).
Von(RMS) = 0.638VLCD.
Vstate2(t) = VSn(t) â VBP1(t).
Voff(RMS) = 0.333VLCD.
Waveforms for the 1:3 multiplex drive mode with 1â3 bias
PCA85176_1
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 01 â 14 April 2010
© NXP B.V. 2010. All rights reserved.
12 of 44
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