OM4085T 查看數據表（PDF） - Philips Electronics

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OM4085T

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex

rates

Product specification

OM4085

handbook, full pagewidth

BP0

BP1

Sn

Sn + 1

VDD

(VDD + VLCD)/2

VLCD

VDD

(VDD + VLCD)/2

VLCD

VDD

VLCD

VDD

VLCD

state 1

state 2

Vop

Vop/2

0

−Vop/2

−Vop

Vop

Vop/2

0

−Vop/2

−Vop

Tframe

LCD segments

state 1

state 2

(a) waveforms at driver

At any instant (t):

Vstate 1(t) = VSn(t) − VBP0(t)

Von(rms) = Vop√10 = 0.791Vop

4

Vstate 2(t) = VSn(t) − VBP1(t)

Voff(rms) = Vop√2 = 0.354Vop

4

(b) resultant waveforms

at LCD segment

MGG394

1997 Feb 25

Fig.5 Waveforms for 1 : 2 multiplex drive mode with 1⁄2 bias: Vop = VDD − VLCD.

8

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