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Touch Sensing

  • US 20100302185A1
  • 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;

    a pliable 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 pliable waveguide;

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

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

    an imaging sensor configured to detect at least some of the radiation that escapes from the pliable waveguide.

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