OM4068 Просмотр технического описания (PDF) - Philips Electronics

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производитель

OM4068

LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

LCD driver for low multiplex rates

Product specification

OM4068

1 : 2 MULTIPLEX DRIVE MODE

When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies, as shown in Fig.6.

BP1

BP2

SEG N

VLCD

1/2VLCD

VSS

VLCD

1/2VLCD

VSS

VLCD

1/2VLCD

VSS

SEG N + 1

VLCD

1/2VLCD

VSS

SEG N + 2

VLCD

1/2VLCD

VSS

SEG N + 3

VLCD

1/2VLCD

VSS

Tframe

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

SEG - BP1

Tframe

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

VLCD

1/2VLCD

0V

−1/2VLCD

−VLCD

MBK820

SEG - BP2

Tframe

BACKPLANE

DRIVER OUTPUTS

BP1

BP2

SEG N

off

off

SEGMENTS

SEG N + 1 SEG N + 2 SEG N + 3

on

off

on

off

on

on

Fig.6 Waveforms for 1 : 2 multiplex drive mode (VOP = VLCD − VSS).

1 : 3 MULTIPLEX DRIVE MODE

When three backplanes are provided in the LCD, the 1 : 3 multiplex mode applies, as shown in Fig.7.

1998 Jun 18

11

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