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Touch Sensing

  • US 20100302196A1
  • Filed: 06/01/2010
  • 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 contact receiving structure having an exposed contact surface for receiving contact by one or more input mechanisms, the contact receiving structure being configured to emit radiation as a consequence of contact with the exposed contact surface by an input mechanism at a contact point, the emitted radiation being emitted by a region of the contact receiving structure that corresponds to the contact point;

    an imaging waveguide having a radiation receiving surface and an imaging surface that is different than the radiation receiving surface, the imaging waveguide being configured to;

    receive, at the radiation receiving surface, radiation emitted by the contact receiving structure, andtransmit received radiation from a position on the radiation receiving surface to a position and with an angle of incidence on the imaging surface that are each a function of the position on the radiation receiving surface at which the transmitted radiation was received;

    an imaging sensor that is optically coupled to the imaging surface of the imaging optical waveguide and that is configured to detect radiation incident upon the imaging surface of the imaging optical waveguide; and

    a processing device configured to determine contact points on the exposed contact surface of the contact receiving structure based on the radiation detected by the imaging sensor.

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