Patent ID: 8760477
Filing Date: 2014-06-24
Classification: G09G

Abstract:
1. A display system comprising a display controller, a display unit comprising a plurality of pixel cells and a transparent common electrode, and a light source; wherein said display controller comprises a processor unit, a memory device and a voltage source, and where said display controller is operative to cause a voltage source to deliver logic and control voltages and data to said display unit, including at least one voltage to the transparent common electrode; wherein said display unit comprises a plurality of pixel cells and peripheral circuitry to receive data, and logic and drive voltages from a voltage source and operate the display according to those voltages and data, the transparent common electrode, liquid crystal alignment layers on the transparent common electrode and on the array of pixel cells, and a liquid crystal layer between the transparent common electrode and the array of pixel cells; and wherein said pixel cell comprises a storage element, a DC balance control switch, a pixel voltage override circuit, an inverter configured to select one voltage from at least two voltages available to it and a pixel mirror configured to receive the output of an inverter; wherein said pixel cell, in one mode, delivers, based on the data state of the memory element as intermediated by the DC balance control switch, a voltage to the inverter to select one of the at least two voltages to be applied to the pixel mirror; and wherein, in a second mode, no voltage is delivered to the input of the inverter and no voltage asserted onto the pixel mirror; and wherein, in a third mode of operation a voltage from the pixel voltage override circuit is delivered to the input to the inverter to select one of the at least two voltages to be asserted onto the pixel mirror.