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OLED display with aging compensation

  • US 20070103411A1
  • Filed: 11/07/2005
  • Published: 05/10/2007
  • Est. Priority Date: 11/07/2005
  • Status: Active Grant
First Claim
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1. A method of compensating image signals for driving an OLED display having a plurality of light-emitting elements having outputs that change with time or use, comprising the steps of:

  • a) obtaining a measured or estimated first value of the current used by individual light-emitting elements in response to known image signals at a first time;

    b) specifying multiple groups of light-emitting elements at a second time, wherein at least one of the specified groups contains at least one light-emitting element common to another specified group;

    c) measuring total currents used by each of the specified groups in response to known image signals at a second time;

    d) forming an estimated second value of the current used by individual light-emitting elements based on the measured total currents;

    e) calculating correction values for individual light-emitting elements based on the difference between the first and second current values; and

    f) employing the correction values to compensate image signals for the changes in the output of the light-emitting elements and produce compensated image signals.

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