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Device and method for operating a self-calibrating emissive pixel

  • US 20060007206A1
  • Filed: 12/17/2004
  • Published: 01/12/2006
  • Est. Priority Date: 06/29/2004
  • Status: Abandoned Application
First Claim
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1. A method for operating a self-calibrating pixel, the method comprising:

  • establishing a sensor capacitor at a predetermined starting voltage;

    delivering a current to a photon emitting device to cause photons to be emitted at a predetermined target photon emission level;

    exposing a sensor device, having electrical properties that varies according to a photon flux on the sensor device, to the emitted photon emission during at least a portion of a display frame time;

    permitting the sensor capacitor to either charge or discharge from the predetermined starting voltage through the sensor device so that the portion of the frame time and the average resistance of the sensor during the portion of the frame time determine the amount of charge on the sensor capacitor;

    measuring the voltage or charge remaining on the sensor capacitor at the end of a portion of the frame time as an indication of the integrated photon flux and pixel luminance during the portion of the frame time used for measurement; and

    modifying the image voltage and current to be applied to the same pixel and gray level during a subsequent display frame time using the measured sensor capacitor voltage as a feedback parameter.

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