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| PCF85134 Datasheet, PDF (10/40 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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NXP Semiconductors
PCF85134
Universal LCD driver for low multiplex rates
7.4.2 1:2 Multiplex drive mode
When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The
PCF85134 allows the use of 1â2 bias or 1â3 bias in this mode as shown in Figure 5 and
Figure 6.
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
Fig 5.
Vstate1(t) = VSn(t) â VBP0(t).
Von(RMS) = 0.791VLCD.
Vstate2(t) = VSn(t) â VBP1(t).
Voff(RMS) = 0.354VLCD.
Waveforms for the 1:2 multiplex drive mode with 1â2 bias
PCF85134_1
Product data sheet
Rev. 01 â 17 December 2009
© NXP B.V. 2009. All rights reserved.
10 of 40
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