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Driving apparatus for display element

  • US 3,883,778 A
  • Filed: 12/03/1973
  • Issued: 05/13/1975
  • Est. Priority Date: 12/03/1973
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a display element;

    first means for quantizing input signals representing the degree of brightness to which said display element is to be energized;

    second means for digitizing the output from said first means;

    a plurality of first AND gates to one of whose input terminals signals corresponding to predetermined upper bits within the output signals from said second means are applied;

    a plurality of second AND gates to one of whose input terminals signals corresponding to predetermined lower bits within the output signals from said second means are applied;

    third means for generating pulse signals varying in width within a predetermined range;

    fourth means for applying simultaneously said pulse signals in the increasing order of their pulse width to the other input terminals of said first and second AND gates;

    first and second OR gates to which the output signals from said first and second AND gates are applied, respectively;

    fifth and sixth means to which the output signals from first and second OR gates are applied, for respectively generating output signals having different respective amplitudes;

    seventh means for adding the outputs from said fifth and sixth means, together; and

    means for supplying the output of said seventh means to said display element.

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