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Liquid crystal display device

  • US 5,621,425 A
  • Filed: 12/21/1993
  • Issued: 04/15/1997
  • Est. Priority Date: 12/24/1992
  • Status: Expired due to Term
First Claim
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1. A liquid crystal display device comprising:

  • a matrix panel comprising a plurality of rows of scanning electrodes, a plurality of columns of signal electrodes, and a liquid crystal layer interposed therebetween;

    a common driver for driving the rows of the scanning electrodes;

    a segment driver for driving the columns of the signal electrodes;

    orthonormal signal generating means for producing a set of orthonormal signals in orthonormal relation with one another and sequentially providing the orthonormal signals in a predetermined combination pattern to the common driver so as to selectively simultaneously drive a predetermined number of the scanning electrodes to effect group sequential scanning according to the combination pattern;

    a frame memory for storing input dot data corresponding to an image to be displayed during each frame;

    dot product computation means for computing a dot product of a set of input dot data sequentially retrieved from the frame memory and the set of orthonormal signals transferred from the orthonormal signal generating means, and for applying a computed dot product to the segment driver to drive the columns of the signal electrodes; and

    synchronizing means for synchronizing a retrieval timing of the dot data from the frame memory with a transfer timing of the orthonormal signals from the orthonormal signal generating means to thereby repeat the group sequential scanning plural times within each cycle;

    wherein the orthonormal signal generating means includes means for horizontally shifting a phase of the set of orthonormal signals in response to the group sequential scanning to form the combination pattern and for performing one of vertically shifting and interchanging the orthonormal signals each cycle of the group sequential scannings to for the combination pattern.

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