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Touch sensing apparatus and method of operating the same

  • US 10,474,249 B2
  • Filed: 06/14/2018
  • Issued: 11/12/2019
  • Est. Priority Date: 12/05/2008
  • Status: Active Grant
First Claim
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1. A touch sensing apparatus, comprising:

  • a touch surface;

    a group of emitters arranged to emit light to illuminate at least part of the touch surface, each respective emitter in the group of emitters configured to transmit a frequency modulated emitter signal by way of the emitted light, the frequency modulated emitter signal identifying the respective emitter;

    a group of light detectors arranged to receive light from the group of emitters, the group of light detectors configured to generate an output signal; and

    at least one processor configured to;

    separate light signals received from individual emitters from the output signal based on the frequency modulated emitter signals, apply an algorithm on the separated light signals and determine a position of one or more objects interacting with the touch surface based on the application of the algorithm,wherein the algorithm comprises transmission tomography and wherein the algorithm for transmission tomography generates a two-dimensional model of an interaction between the one or more objects and the touch surface.

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