November 22, 2004

10

Philips Semiconductors

Preliminary specification

Universal LCD driver

for low multiplex rates

PCF8562

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. The backplane (BPn) and segment

Fig.5 Static drive mode waveforms.

ull pagewidth

MGL745

VSS

VLCD

VSS

VLCD

VSS

VLCD

VLCD

−VLCD

−VLCD

VLCD

state 1

0 V

BP0

Sn

Sn + 1

state 2

0 V

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 1

(on)

state 2

(off)

Tframe

V

()

V

S

n

t

()

V

()

–

=

V

on(rms)

V

LCD

=

V

()

V

S

n1

+

t

()

V

()

–

=

V

off(rms)

0 V

=