OM4085 Philips Semiconductors, OM4085 Datasheet - Page 10

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OM4085

Manufacturer Part Number
OM4085
Description
Universal LCD driver for low multiplex rates
Manufacturer
Philips Semiconductors
Datasheet
Philips Semiconductors
1997 Feb 25
handbook, full pagewidth
Universal LCD driver for low multiplex
rates
S n
S n
state 1
state 2
BP2
BP0
BP1
S n
1
2
V op
V op /3
V op
V op
V op /3
V op
2V op /3
V op /3
2V op /3
V op /3
2V op /3
2V op /3
V DD
V DD
V DD
V LCD
V DD
V DD
V DD
V LCD
V DD
V DD
V DD
V LCD
V DD
V DD
V DD
V LCD
V DD
V DD
V DD
V LCD
V DD
V DD
V DD
V LCD
Fig.7 Waveforms for 1 : 3 multiplex drive mode: V
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
V op /3
2V op /3
V op /3
2V op /3
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
T frame
10
op
state 1
state 2
= V
LCD segments
At any instant (t):
V state 1 (t) = V S
V on(rms) =
V state 2 (t) = V S
V off(rms) =
DD
V
V op
V op
LCD
9
3
n
n
= 0.333V op
.
33 = 0.638V op
(t)
(t)
MGG395
V BP0 (t)
V BP1 (t)
Product specification
OM4085

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