Patent ID: 6657609
Filing Date: 2003-12-02
Classification: G09G

Abstract:
A liquid crystal display apparatus, comprising:a beam splitter for passing light having a first polarization and for deflecting light having a second polarization; a liquid crystal display driver comprised of a plurality of pixel elements connected in a pixel matrix, wherein each pixel element includes a common electrode, a pixel electrode, and an interposed liquid crystal layer, and wherein all pixel elements share a common transparent electrode, said liquid crystal display driver is for receiving light from said beam splitter, said liquid crystal display driver is further for using said pixel elements to modulate the received light according to image information in interlaced even frames and odd frames, wherein modulation during even frames depends on a potential difference between a common electrode voltage on said common electrode and first stored voltages on said pixel electrodes, wherein said first stored voltages are produced by selectively storing potentials of a first ramp in even frames, wherein said modulation during odd frames depends on a potential difference between said common electrode voltage and second stored voltages on said pixel electrodes, wherein said second stored voltages are produced by selectively storing potentials of a second ramp in odd frames; a lens system for optically modifying said modulated light beam; a viewing screen for displaying an image produced by said optically modified light beam; a light sensor for receiving a portion of said modulated light beam and for producing a sensor signal that depends on said received portion; and correction circuitry for receiving said sensor signal and for adjusting said common electrode voltage in response to said sensor signal such that the modulation in said even frames and the modulation in the odd frames have the same average modulation.