NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
7.3.4.4
1:4 multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies as
shown in Figure 11 .
T fr
V LCD
LCD segments
BP0
2V LCD /3
V LCD /3
V SS
BP1
BP2
BP3
Sn
Sn+1
Sn+2
Sn+3
state 1
state 2
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
V SS
V LCD
2V LCD /3
V LCD /3
0V
-V LCD /3
-2V LCD /3
-V LCD
V LCD
2V LCD /3
V LCD /3
0V
-V LCD /3
-2V LCD /3
(a) Waveforms at driver.
state 1
state 2
-V LCD
(b) Resultant waveforms
at LCD segment.
013aaa211
V state1 (t) = V Sn (t) ? V BP0 (t).
V on(RMS) = 0.577V LCD .
V state2 (t) = V Sn (t) ? V BP1 (t).
V off(RMS) = 0.333V LCD .
Fig 11. Waveforms for the 1:4 multiplex drive mode with 1 ? 3 bias
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 11 July 2013
? NXP B.V. 2013. All rights reserved.
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