OM4085 데이터 시트보기 (PDF) - Philips Electronics

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OM4085

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 − 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√5 = 0.745Vop

3

Vstate 2(t) = VSn(t) − VBP1(t)

Voff(rms) = Vop = 0.333Vop

3

MGG393

1997 Feb 25

Fig.6 Waveforms for 1 : 2 multiplex drive mode with 1⁄3 bias: Vop = VDD − VLCD.

9

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