PCF8576U/5(2001) View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

PCF8576U/5
(Rev.:2001)

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex rates

Product specification

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

1⁄2bias 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.

T frame

V DD

LCD segments

BP0

V LCD

V DD

Sn

V LCD

state 1

(on)

state 2

(off)

Sn 1

VDD

V LCD

(a) waveforms at driver

V op

state 1

0

Vop

V op

state 2

0

Vop

(b) resultant waveforms

at LCD segment

MBE539

Vstate1(t) = VSn(t) – VBP0(t)

Von(rms) = Vop

Vstate2(t)

=

VSn

+

(t)

1

–

VBP0(t)

Voff(rms) = 0 V

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

2001 Oct 02

9

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