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4-MULTIPLEXED LCD WITH A STANDARD ST62

Figure 2. Connections inside a direct drive LCD

All these pins are connected to MCU I/O pins operating in output mode, either at logic level 0

or at logic level 1.

The backplane is driven with a signal

50%.

When selecting a segment ON, a signal with opposite polarity to

COM is sent to the corre-

sponding segment electrode pin. When the non-inverted signal

COM is sent to the segment

electrode pin, the segment is OFF.

Figure 3. LCD signals for non-multiplexed drive

Note: on Figure 3,

COM

backplane

segment

electrodes

…

t

t

t

COM

S

0

0

0

(

(