ST7282A5 - ST7282B5 - ROM FROM EPROM

Family

Issuer Ref.

Chrono

March 26, 1997

Previous Ref

Edition

ST7

PG-RO

97115

7282A5B5

Target C

Page 15/23

2.2.2.2 Working with 1/4 Bias

Depending on the selected display material, the

possible to reduce the LCD resistor chain to 4 re-

sistors, and operate with the 1/4 bias method.

If VLCD35 and VLCD25 are connected to the

same voltage, the segment and backplane drivers

will work in the same way as with 1/5 bias, but the

resulting waveforms will look a bit different :

Figure 5. Waveform on common and on segment output working with Bias 1/4

VLCD

4/5

3/5

2/5

1/5

GND

VLCD

4/5

3/5

2/5

1/5

GND

0

101

01

0

1

ST6LC351.DS4

SEGMENT SELECTED

SEGMENT OFF

VLCD

GND

VLCD

GND

01

01

01

0

1

1/4

2/4

3/4

1/4

2/4

3/4

SEGMENT SELECTED

SEGMENT OFF

ST6LC362.DS4