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PCF85162

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCF85162

Universal LCD driver for low multiplex rates

7.4.2 1:2 Multiplex drive mode

When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The

PCF85162 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in Figure 7 and

Figure 8.

BP0

BP1

Sn

Sn+1

VLCD

VLCD/2

VSS

VLCD

VLCD/2

VSS

VLCD

VSS

VLCD

VSS

state 1

state 2

VLCD

VLCD/2

0V

−VLCD/2

−VLCD

VLCD

VLCD/2

0V

−VLCD/2

−VLCD

Tfr

LCD segments

state 1

state 2

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

013aaa208

Fig 7.

Vstate1(t) = VSn(t)  VBP0(t).

Von(RMS) = 0.791VLCD.

Vstate2(t) = VSn(t)  VBP1(t).

Voff(RMS) = 0.354VLCD.

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

PCF85162

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 — 16 June 2011

© NXP B.V. 2011. All rights reserved.

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