1998 Jul 30

10

Philips Semiconductors

Product specification

Universal LCD driver for low multiplex

rates

PCF8576C

6.4

LCD drive mode waveforms

6.4.1

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.5.

V

()

V

S

n

t

()

V

()

–

=

V

on(rms)

V

op

=

V

()

V

S

n1

+

t

()

V

()

–

=

V

off(rms)

0V

=

MBE539

V DD

V LCD

V LCD

V DD

V LCD

V op

Vop

state 1

0

BP0

Sn

S n 1

V op

Vop

state 2

0

(a) waveforms at driver

(b) resultant waveforms

at LCD segment

LCD segments

state 1

(on)

state 2

(off)

Tframe

VDD