2004 Dec 22

12

Philips Semiconductors

Product specification

Universal LCD driver for low

multiplex rates

PCF8576D

6.4.2

The 1 : 2 multiplex drive mode is used when two backplanes are provided in the LCD. This mode allows fractional LCD

handbook, full pagewidth

MGL746

state 1

BP0

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 2

BP1

state 2

state 1

VSS

VLCD

VLCD/2

VSS

VSS

VLCD

VLCD

VSS

VLCD

VLCD

VLCD

0 V

0 V

VLCD/2

VLCD/2

VLCD/2

−VLCD

−VLCD

−VLCD/2

−VLCD/2

Sn

Sn + 1

Tframe

V

()

V

S

n

t

()

V

()

–

=

V

on(rms)

0.791V

LCD

=

V

()

V

S

n

t

()

V

()

–

=

V

off(rms)

0.354V

LCD

=