Penlight and touch screen data input system and method for flat panel displays

  • US 20050200293A1
  • Filed: 02/08/2005
  • Published: 09/15/2005
  • Est. Priority Date: 02/24/2004
  • Status: Active Grant
First Claim
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1. An emissive pixel device having an integrated luminance and input sensor, the pixel device comprising:

  • a light emitting device;

    a pixel emitter drive circuit generating a current to drive the light emitting device to a predetermined luminance corresponding to an image voltage and applying the drive current to the light emitting device during a frame time;

    at least one photo sensor that exhibits a change in electrical characteristic in response to a change in incident photon flux disposed near the light emitting device to;

    (i) intercept a measurable photon flux when the light emitting device is in an emitting state, and (ii) to detect a measurable photon flux from a source outside the pixel when the light emitting device is not in an emitting state;

    at least one of a voltage, current, and charge reading circuit for measuring;

    (i) a first voltage across, a first current from, or a first charge generated by the photo sensor device at the end of a first portion of a non-emitting time period during a non-light emitting state, and wherein the measured first voltage, first current, or first charge being an indication of a measured luminance emitted from a source outside the pixel during the first portion of the time period; and

    (ii) a second voltage across, a second current from, or a second charge generated by the photo sensor device at the end of a second portion of an emitting time period during the light emitting state, and wherein the measured second voltage, second current, or second charge being an indication of a measured luminance emitted from the pixel during a second portion of the time period.

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