I have read this document:
AN658 - LCD Fundamentals and the LCD Driver Module of 8-Bit PIC® Microcontrollers
I understand that the main concern is to maintain 0 Vdc bias on every pixel when driving LCD display.
But I do not understand why there are multiple bias voltages required to drive backplanes (= common nodes).
Why I can't use just static biasing?
For example when I want to make 1 pixel on:
1st frame would be BP0=1 (common), SEG0=0, the 2nd frame would be BP0=0 (common), SEG0=1. This would make 0 Vdc bias and the pixel would have the maximal contrast.