NXP Semiconductors
PCF8534
Universal LCD driver for low multiplex rates
6.4 LCD drive mode waveforms
6.4.1 Static drive mode
The static LCD drive mode is used when a single backplane is provided in the LCD.
Backplane and segment drive waveforms for this mode are shown in Figure 4.
BP0
VLCD
VSS
VLCD
Sn
VSS
Tframe
LCD segments
state 1
(on)
state 2
(off)
Sn+1
VLCD
VSS
(a) Waveforms at driver.
VLCD
state 1 0 V
−VLCD
VLCD
state 2
0V
−VLCD
(b) Resultant waveforms
at LCD segment.
Vstate1(t) = Vsn(t) − VBP0(t).
VON(rms) = VLCD.
Vstate2(t) = V(sn + 1)(t) − VBP0(t).
VOFF(rms) = 0 V.
Fig 4. Static drive mode waveforms
mgl745
PCF8534_0
Preliminary datasheet
Rev. 00.05 — 20 February 2007
© NXP B.V. 2007. All rights reserved.
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