PCF8562 Просмотр технического описания (PDF) - Philips Electronics

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PCF8562

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver

for low multiplex rates

Preliminary specification

PCF8562

6.4.2 1 : 2 MULTIPLEX DRIVE MODE

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

bias voltages of 1⁄2bias or 1⁄3bias as shown in Figs 6 and 7.

handbook, full pagewidth

BP0

BP1

Sn

Sn + 1

VLCD

VLCD/2

VSS

VLCD

VLCD/2

VSS

VLCD

VSS

VLCD

VSS

VLCD

VLCD/2

state 1

0V

−VLCD/2

−VLCD

VLCD

VLCD/2

state 2

0V

−VLCD/2

−VLCD

Vstate1(t) = VSn(t) – VBP0(t)

Von(rms) = 0.791VLCD

Vstate2(t) = VSn(t) – VBP1(t)

Voff(rms) = 0.354VLCD

Tframe

LCD segments

state 1

state 2

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

MGL746

Fig.6 Waveforms for the 1 : 2 multiplex drive mode with 1⁄2 bias.

November 22, 2004

11

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