1997 Jul 03

21

Philips Semiconductors

Product specification

8-bit microcontrollers with LCD-driver

P83C434; P83C834

6.7.4.2

1 : 2 multiplex drive mode

When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The P83C434; P83C834 allows use of

1

full pagewidth

MGG015

state 1

0

BP0

(a) waveforms at driver

(b) resultant waveforms

at LCD element

LCD elements

state 2

Tframe

BP1

−Vop/2

−Vop

Vop/2

Vop

−Vop/2

−Vop

Vop/2

Vop

state 2

0

state 1

VDD(P)

VDD(P)

VDD(P)

(VDD(P)+VSS)/2

VDD(P)

(VDD(P)+VSS)/2

VSS

VSS

VSS

VSS

Sn+1

Sn

V

()

V

S

n

t

()

V

()

–

=

V

on(rms)

0.791V

op

=

V

()

V

S

n

t

()

V

()

–

=

V

off(rms)

0.354V

op

=