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| PCA9620 Datasheet, PDF (24/71 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
7.4.2.2 1:2 Multiplex drive mode
When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The
PCA9620 allows the use of 1â2 bias or 1â3 bias in this mode as shown in Figure 16 and
Figure 17.
BP0
BP1
Sn
Sn+1
VLCD
VLCD/2
VSS
VLCD
VLCD/2
VSS
VLCD
VSS
VLCD
VSS
state 1
state 2
VLCD
VLCD/2
0V
âVLCD/2
âVLCD
VLCD
VLCD/2
0V
âVLCD/2
âVLCD
Tfr
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
013aaa208
Vstate1(t) = VSn(t) â VBP0(t).
Vstate2(t) = VSn(t) â VBP1(t).
Von(RMS)(t) = 0.791VLCD. Voff(RMS)(t) = 0.354VLCD.
Fig 16. Waveforms for the 1:2 multiplex drive mode with 1â2 bias (line inversion mode)
PCA9620
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 â 9 December 2010
© NXP B.V. 2010. All rights reserved.
24 of 71
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