OM4085 데이터 시트보기 (PDF) - Philips Electronics
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OM4085 Datasheet PDF : 36 Pages
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Philips Semiconductors
Universal LCD driver for low multiplex
rates
Product specification
OM4085
handbook, full pagewidth
BP0
BP1
BP2
BP3
Sn
Sn + 1
Sn + 2
Sn + 3
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
state 1
state 2
Vop
2Vop/3
Vop/3
0
−Vop/3
−2Vop/3
−Vop
Vop
2Vop/3
Vop/3
0
−Vop/3
−2Vop/3
−Vop
Tframe
LCD segments
state 1
state 2
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
At any instant (t):
Vstate 1(t) = VSn(t) − VBP0(t)
Von(rms)
=
Vop√3
3
=
0.577Vop
Vstate 2(t) = VSn(t) − VBP1(t)
Voff(rms)
=
Vop
3
=
0.333Vop
MGG396
1997 Feb 25
Fig.8 Waveforms for 1 : 4 multiplex drive mode: Vop = VDD − VLCD.
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