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Digital video display system with a plurality of gray-scale levels

  • US 4,158,200 A
  • Filed: 09/26/1977
  • Issued: 06/12/1979
  • Est. Priority Date: 09/26/1977
  • Status: Expired due to Term
First Claim
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1. A digital video display system comprising:

  • a video monitor for the display of information in the form of alpha-numeric characters and other symbols formed of individual picture elements;

    a video synthesizer coupled to said video monitor, said video synthesizer including means to generate video signals selected from three or more different voltage levels to form video signals corresponding to different levels of luminance to be displayed by said video monitor for each of said picture elements;

    a character generator coupled to said video synthesizer, said character generator including a character storage to store binary codes each corresponding to one of said different levels of luminance; and

    buffer means coupled to said character generator, said buffer means including means to temporarily store a sequence of character codes representing different alpha-numeric characters to be displayed by said video monitor, said character codes being transferred to said character generator to select a sequence of binary codes for the different picture elements forming an alpha-numeric character.

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