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| PCF8562 Datasheet, PDF (11/36 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates | |||
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Philips Semiconductors
Universal LCD driver
for low multiplex rates
Preliminary specification
PCF8562
6.4.2 1 : 2 MULTIPLEX DRIVE MODE
The 1 : 2 multiplex drive mode is used when two backplanes are provided in the LCD. This mode allows fractional LCD
bias voltages of 1â2bias or 1â3bias as shown in Figs 6 and 7.
handbook, full pagewidth
BP0
BP1
Sn
Sn + 1
VLCD
VLCD/2
VSS
VLCD
VLCD/2
VSS
VLCD
VSS
VLCD
VSS
VLCD
VLCD/2
state 1
0V
âVLCD/2
âVLCD
VLCD
VLCD/2
state 2
0V
âVLCD/2
âVLCD
Vstate1(t) = VSn(t) â VBP0(t)
Von(rms) = 0.791VLCD
Vstate2(t) = VSn(t) â VBP1(t)
Voff(rms) = 0.354VLCD
Tframe
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
MGL746
Fig.6 Waveforms for the 1 : 2 multiplex drive mode with 1â2 bias.
November 22, 2004
11
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