OM4085 Philips Semiconductors, OM4085 Datasheet - Page 9

• Manufacturer Part Number: OM4085
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
1997 Feb 25
Universal LCD driver for low multiplex
rates
S n
state 1
state 2
Fig.6 Waveforms for 1 : 2 multiplex drive mode with
BP0
BP1
S n
1
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V DD
V LCD
V LCD
V LCD
V LCD
V op
V op /3
V op /3
2V op /3
V op
V op
V op /3
V op /3
2V op /3
V op
2V op /3
2V op /3
0
0
V op /3
2V op /3
V op /3
2V op /3
V op /3
2V op /3
V op /3
2V op /3
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
T frame
9
1
state 1
state 2
3
At any instant (t):
V state 1 (t) = V S n (t)
V on(rms) =
V state 2 (t) = V S n (t)
V off(rms) =
bias: V
LCD segments
op
V op
V op
3
3
= V
= 0.333V op
5 = 0.745V op
DD
MGG393
V BP0 (t)
V BP1 (t)
V
LCD
Product specification
.
OM4085