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Display device drive circuit

  • US 4,766,430 A
  • Filed: 12/19/1986
  • Issued: 08/23/1988
  • Est. Priority Date: 12/19/1986
  • Status: Expired due to Term
First Claim
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1. A system for applying various voltage levels of a ramp voltage to the individual columns of pixels in a display device having a matrix of pixels arranged vertically in columns and horizontally in rows comprising:

  • a plurality of voltage responsive signal transfer means individually actuating said columns of pixels, said signal transfer means simultaneously receiving said ramp voltage whereby pixel columns actuated by conductive signal transfer means are charged to voltage levels proportional to the level of said ramp voltage;

    means for providing an analog information signal having brightness levels for controlling the brightness of said pixels;

    means for receiving said analog information signal and providing digital brightness signals individually indicative of said brightness levels;

    digital storage means for receiving and storing said digital brightness signals, said digital storage means including a plurality of digital storage sets, each of said digital storage sets having a plurality of serially loaded digital storage segments, each of said digital storage segments storing said grey scale codes for one of said columns of pixels to individually provide said brightness signals to said columns;

    a plurality of counter means individually responsive to said digital storage segments for receiving said digital brightness signals as brightness counts for each of said columns, whereby said counter means are set to counts equal to said brightness levels and are set to count to zero, said counter means individually actuating said voltage reponsive signal transfer means whereby each of said signal transfer means is conductive when the associated counter is counting and nonconductive when the associated counter reaches zero whereby the pixels of individual columns are charged to various voltage levels of said ramp voltage in accordance with said brightness levels.

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