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DETERMINING TOUCH DATA FOR ONE OR MORE OBJECTS ON A TOUCH SURFACE

  • US 20120212441A1
  • Filed: 10/13/2010
  • Published: 08/23/2012
  • Est. Priority Date: 10/19/2009
  • Status: Active Grant
First Claim
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1. A method in a touch-sensing apparatus, said apparatus comprising a light transmissive panel that defines a touch surface and an opposite surface, a light source arrangement for providing sheets of light inside the panel, wherein each sheet comprises light that propagates by internal reflection between the touch surface and the opposite surface from an incoupling site to an outcoupling site, said apparatus further comprising a light sensor arrangement for detecting light reaching the outcoupling site, wherein the touch-sensing apparatus is configured such that one or more objects touching the touch surface causes a local attenuation of at least two sheets of light, said method comprising the steps of:

  • obtaining at least one projection signal which is indicative of a spatial distribution of light within said outcoupling site;

    processing said at least one projection signal for identification of signal profiles representing said attenuation;

    identifying, based on the signal profiles, one or more candidate touch areas on the touch surface;

    processing said at least one projection signal to reconstruct a two-dimensional distribution of signal values within said one or more candidate touch areas; and

    determining touch data for the or each object by processing the reconstructed signal values within the candidate touch areas.

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