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Optical coupling of light into touch-sensing systems

  • US 9,857,917 B2
  • Filed: 11/24/2014
  • Issued: 01/02/2018
  • Est. Priority Date: 12/17/2012
  • Status: Active Grant
First Claim
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1. A touch-sensitive apparatus, comprising:

  • a light transmissive panel that defines a front surface and an opposite, rear surface;

    a plurality of light emitters and a plurality of light detectors arranged to optically face the rear surface along a perimeter of a touch-sensitive region on the light transmissive panel; and

    at least one diffusively reflecting element arranged on the front surface along the perimeter of the touch-sensitive region;

    wherein the plurality of light emitters are configured to emit respective beams of light onto said at least one diffusively reflecting element, said at least one diffusively reflecting element configured to generate propagating light that propagates by total internal reflection inside the light transmissive panel across the touch-sensitive region; and

    wherein the plurality of light detectors are configured to receive detection light generated as the propagating light impinges on said at least one diffusively reflecting element, to define a grid of propagation paths across the touch-sensitive region between pairs of light emitters and light detectors.

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