Patent ID: 7443374

Claim:
A display device comprising a plurality of pixel cells having a common electrode switchable between a high voltage V ITO — H and a low voltage V ITO — L said display device further comprising: a voltage controller connected to a multiplexing switch in each of said pixel cells to provide control signals to digitally select a switch-on state and a switch-off state to apply a high voltage V 1 and a low voltage V 0 on a pixel electrode in each of said pixel cells wherein said high and low voltage substantially equal to a voltage represented by V 1 and V 0 respectively wherein said voltage of V 1 and V 0 are different from voltages Vdd and Vss as as high and low rail voltages respectively applied to a backplane of the display device; said voltage controller further includes a DC balancing state timing controller for synchronizing an inverting operation of said substantially V 1 or V 0 applied to said pixel electrode and controlling an inverter in each of said pixel cells with a common electrode DC-balancing switch between said high voltage V ITO — H and low voltage V ITO — L ; and said multiplexing switch in each of said pixel cell including a P-type transistor and a N-type transistor for providing expanded range of controllable voltages of said display device.