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Waveguide-based touch system employing interference effects

  • US 9,952,719 B2
  • Filed: 04/22/2013
  • Issued: 04/24/2018
  • Est. Priority Date: 05/24/2012
  • Status: Active Grant
First Claim
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1. A touch system for use atop a display unit and for sensing a localized touch event, comprising:

  • first and second waveguides that define first and second separate optical paths having respective first and second optical path lengths that respectively change by first and second amounts by the localized touch event occurring directly on an upper surface of the first waveguide and causing a first amount of deformation in the first waveguide and a second amount of deformation in the second waveguide that is different from the first amount of deformation;

    at least one light source system operably arranged relative to respective input ends of the first and second waveguides and configured to input first and second light beams into the first and second waveguides, respectively; and

    at least one detector system operably arranged relative to respective output ends of the first and second waveguides and configured to interfere and detect the first and second light beams and generate a detector signal representative of the amount of deformation in the first and second waveguides caused by the localized touch event.

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