36.6.2.2 1/2 Duty and 1/2 Bias

For an LCD with two common terminals (1/2 duty), a more complex waveform must be used to control segments individually. Although 1/3 bias can be selected, 1/2 bias is most common for these displays. In the waveform shown in the following figure, SEG0–COM0 is the voltage across a segment that is on, and SEG0–COM1 is the voltage across a segment that is off.