SAM4L Datasheet, PDF (1031/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

Figure 39-4. Driving a LCD With One Common Line
ATSAM4L4/L2
39.6.2.2
1/2 Duty and 1/3 Bias
For a LCD with two common terminals (1/2 duty) a more complex waveform must be used to
individually control segments. SEG0-COM0 is the voltage across a segment that is ON and
SEG0-COM1 is the voltage across a segment that is OFF.
Figure 39-5. Driving an LCD With Two Common Lines
39.6.2.3
1/3 Duty and 1/3 Bias
1/3 bias is usually recommended for LCD with three common terminals (1/3 duty). SEG0-COM0
is the voltage across a segment that is ON and SEG0-COM1 is the voltage across a segment
that is OFF.
42023C–SAM–02/2013
1031