PCF8566 Просмотр технического описания (PDF) - Philips Electronics

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PCF8566

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex

rates

Product specification

PCF8566

6.4 LCD drive mode waveforms

The static LCD drive mode is used when a single backplane is provided in the LCD. Backplane and segment drive

waveforms for this mode are shown in Fig.4.

When two backplanes are provided in the LCD the 1 : 2 multiplex drive mode applies. The PCF8566 allows use of

1⁄2 or 1⁄3 bias in this mode as shown in Figs 5 and 6.

The backplane and segment drive waveforms for the 1 : 3 multiplex drive mode (three LCD backplanes) and for the 1 : 4

multiplex drive mode (four LCD backplanes) are shown in Figs 7 and 8 respectively.

handbook, full pagewidth

BP0

Sn

Sn + 1

VDD

VLCD

VDD

VLCD

VDD

VLCD

Vop

Tframe

LCD segments

state 1

(on)

state 2

(off)

(a) waveforms at driver

state 1

0

−Vop

Vop

state 2

0

At any instant (t):

Vstate 1(t) = VSn(t) − VBP0(t)

Von(rms) = Vop

Vstate 2(t) = VSn + 1(t) − VBP0(t)

Voff(rms) = 0 V

−Vop

(b) resultant waveforms

at LCD segment

MGG392

1998 May 04

Fig.4 Static drive mode waveforms: Vop = VDD − VLCD.

8

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