OM4085 Philips Semiconductors, OM4085 Datasheet - Page 8

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

Philips Semiconductors
1997 Feb 25
handbook, full pagewidth
Universal LCD driver for low multiplex
rates
Fig.5 Waveforms for 1 : 2 multiplex drive mode with
S n
state 1
state 2
BP0
BP1
S n
1
(V DD
(V DD
V DD
V LCD
V DD
V LCD
V DD
V LCD
V DD
V LCD
V op
V op /2
V op /2
V op
V op
V op /2
V op /2
V op
0
0
V LCD )/2
V LCD )/2
(b) resultant waveforms
(a) waveforms at driver
at LCD segment
T frame
8
1
state 1
state 2
2
At any instant (t):
V state 1 (t) = V S
V on(rms) =
V state 2 (t) = V S n (t)
V off(rms) =
bias: V
LCD segments
op
V op
V op
4
4
= V
n
(t)
10 = 0.791V op
2 = 0.354V op
DD
V BP0 (t)
V BP1 (t)
MGG394
V
LCD
Product specification
.
OM4085