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Touch Sensing

  • US 20100302210A1
  • Filed: 04/09/2010
  • Published: 12/02/2010
  • Est. Priority Date: 06/01/2009
  • Status: Active Grant
First Claim
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1. A touch-screen device comprising:

  • a radiation source;

    an optical waveguide configured to receive radiation emitted by the radiation source and to cause at least some of the received radiation to undergo total internal reflection within the optical waveguide;

    a pliable frustrating layer disposed relative to the optical waveguide so as to enable the pliable frustrating layer to contact the optical waveguide when the pliable frustrating layer is physically deformed, the pliable frustrating layer being configured to;

    cause frustration of the total internal reflection of the received radiation within the optical waveguide at a contact point between the pliable frustrating layer and the optical waveguide when the pliable frustrating layer is physically deformed to contact the optical waveguide such that some of the received radiation undergoing total internal reflection within the optical waveguide escapes from the optical waveguide at the contact point;

    an imaging sensor configured to detect at least some of the radiation that escapes from the optical waveguide; and

    a structure disposed relative to the frustrating layer, the structure being configured to steer at least a portion of the radiation that escapes from the optical waveguide toward the imaging sensor.

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