PCF8576_01 datasheet(9/44 Pages) PHILIPS

9 / 44 page

2001 Oct 02

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex rates

PCF8576

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 mode applies. The PCF8576 allows use of

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

When three backplanes are provided in the LCD, the 1 : 3

multiplex drive mode applies, as shown in Fig.7.

When four backplanes are provided in the LCD, the 1 : 4

multiplex drive mode applies, as shown in Fig.8.

state1 t

()

BP0 t

()

–

on(rms)

state2 t

()

BP0 t

()

–

off(rms)

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

MBE539

V DD

V LCD

V DD

V LCD

V op

Vop

state 1

BP0

S n 1

V op

Vop

state 2

(a) waveforms at driver

(b) resultant waveforms

at LCD segment

LCD segments

state 1

(on)

state 2

(off)

Tframe

VDD

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