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Charged-based compensation and parameter extraction in AMOLED displays

  • US 10,475,379 B2
  • Filed: 11/14/2016
  • Issued: 11/12/2019
  • Est. Priority Date: 05/20/2011
  • Status: Active Grant
First Claim
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1. A method of extracting a circuit parameter from a pixel circuit and providing in-pixel compensation for variation or aging of the pixel circuit, the pixel circuit including a light emitting device, a drive transistor to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal, the method comprising the steps of:

  • causing an in-pixel compensation of the pixel circuit byapplying a reference voltage from a first line to a storage device in the pixel circuit andredirecting to a second line current from a first node between the drive transistor and the light emitting deviceto charge the storage device based on the reference voltage to self-compensate for a variation or aging of the drive transistor or the light emitting device or both in the pixel circuit;

    extracting, using a circuit external to the pixel circuit, the circuit parameter from the pixel circuit; and

    subsequently driving the pixel circuit using programming information that has been compensated based on at least the extracted circuit parameter.

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