IMPROVED PIXEL CIRCUIT AND DISPLAY SYSTEM COMPRISING SAME

摘要

A display system comprises a display controller (24), a display unit (36), and a light source. The display controller (24) includes a processor unit, a memory device (10), a voltage source and, optionally, a light source control unit. The display unit (36) includes an array of pixel cells and circuitry to receive logic and control voltages and data and operate the display, a transparent counter electrode (140), and a liquid crystal layer (130) disposed between the transparent counter electrode (140) and the array of pixel cells. The pixel cell (1205) includes a storage element (1300), a DC balance control switch (1320), a pixel voltage override circuit, an inverter able to select between two voltages available to it, and a pixel electrode / mirror (1212). In different modes of operation the pixel mirror voltage may be determined by the storage element or by the pixel voltage override circuit. The display system may display images in one period and reset to a fixed state in another period.