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System and methods for extracting correlation curves for an organic light emitting device

  • US 10,163,401 B2
  • Filed: 06/30/2016
  • Issued: 12/25/2018
  • Est. Priority Date: 02/04/2010
  • Status: Active Grant
First Claim
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1. A method of compensating for efficiency degradation of an organic light emitting device (OLED) in an array-based semiconductor device having arrays of pixels that include OLEDs, said method comprising:

  • determining, for a plurality of operating conditions, interdependency curves relating changes in an electrical operating parameter of said OLEDs and the efficiency degradation of said OLEDs in said array-based semiconductor device, the plurality of operating conditions comprising at least two operating condition types;

    determining at least one operating condition for the OLED in respect of the at least two operating condition types;

    measuring the electrical operating parameter of said OLED;

    determining an efficiency degradation of said OLED using said interdependency curves, said at least one operation condition for the OLED, and said measured electrical operating parameter;

    determining a correction factor for the OLED with use of said efficiency degradation;

    andcompensating for said efficiency degradation with use of said correction factor;

    wherein the at least two operating condition types comprise a temperature condition and a stress condition, and the at least one operation condition for the OLED comprises a temperature history and a stress history;

    wherein each interdependency curve has an associated temperature condition and a stress condition, and wherein determining an efficiency degradation comprises;

    determining at least one temperature associated interdependency curve with use of said temperature history; and

    determining from said at least one temperature associated interdependency curve and said stress history and said measured electrical operating parameter, the efficiency degradation of the OLED; and

    wherein after the correction factor for the OLED has been determined, a start point associated with the interdependency curves is reset.

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