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Touch-sensing display panel

  • US 8,963,886 B2
  • Filed: 01/16/2013
  • Issued: 02/24/2015
  • Est. Priority Date: 07/13/2011
  • Status: Active Grant
First Claim
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1. A touch-sensing display panel, comprising:

  • a plurality of image-forming pixel elements;

    a planar light guide with a first refractive index, the planar light guide having a front surface forming a touch-sensing region and an opposite rear surface facing the plurality of image-forming pixel elements;

    a plurality of light emitters arranged at a peripheral region of the touch-sensing display panel to emit light into the planar light guide for propagation therein through total internal reflection in at least the front surface;

    a plurality of light detectors at the peripheral region for receiving light from the planar light guide; and

    an optical layer at the rear surface of the planar light guide to cover image-forming pixel elements in at least a central region of the touch-sensing display panel,wherein said optical layer is configured to reflect at least a part of the light from the plurality of light emitters impinging thereon from within the planar light guide,wherein the optical layer has a second refractive index, which is less than the first refractive index, andwherein an extension portion of the optical layer is arranged over the plurality of light emitters, said extension portion having a third refractive index, which is greater than the second refractive index.

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