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Electroluminescent panel driving system for driving the panel's electrodes only when non-blank data is present to conserve power

  • US 4,823,121 A
  • Filed: 10/15/1986
  • Issued: 04/18/1989
  • Est. Priority Date: 10/15/1985
  • Status: Expired due to Term
First Claim
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1. An electroluminescent panel display system comprising:

  • electroluminescent panel means, for displaying information, having a plurality of display lines;

    display drive means, operatively connected to said electroluminescent panel means, for producing image data for each display line, said image data for each display line represented by a group of signals, each signal being either a first level or a second level, said first level representing a spot of intended illumination on said electroluminescent panel means, said second level representing a spot of intended non-illumination on said electroluminescent panel means;

    said display means providing drive signals, producing at a first instant in time a first voltage in accordance with said drive signals and producing at a second instant in time a second voltage in accordance with said drive signals, said first voltage preparing said electroluminescent panel means to illuminate, said second voltage causing a spot of illumination on said electroluminescent panel means; and

    display control means, operatively connected to said display drive means to receive said image data and said drive signals, for detecting when at least one first level is present in said image data;

    said display control means permitting the production of said first and said second voltage by said display drive means when at least one first level is present in said image data and preventing the production of said first voltage and said second voltage by said display drive means when at least one first level is not detected in said image data, said display control means thereby preventing power loss when an individual display line contains no intended spots of illumination.

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