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Touch determination with improved detection of weak interactions

  • US 10,031,623 B2
  • Filed: 09/26/2017
  • Issued: 07/24/2018
  • Est. Priority Date: 02/21/2012
  • Status: Expired due to Fees
First Claim
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1. A method of enabling touch determination based on an output signal from a touch-sensitive apparatus, the touch-sensitive apparatus including a panel and a plurality of emitters and a plurality of detectors defining detection lines that extend across a surface portion of the panel between pairs of emitters and detectors, the touch-sensitive apparatus further including at least one signal generator coupled to the plurality of emitters to generate signals, and at least one signal detector coupled to the plurality of detectors to generate the output signal, the output signal being indicative of interaction between one or more touching objects and one or more of the detection lines, wherein the method comprises:

  • processing the output signal to obtain observed values for a plurality of the detection lines;

    for each respective detection line among the plurality of the detection linesgenerating a projected value for the respective detection line based on a projection function that defines a functional relation between a fitted interaction pattern and the projected value for the respective detection line, the fitted interaction pattern having at least one basis function defining an attenuation strength at a position on the surface portion within a two-dimensional extent, wherein the projection function models a projected value for each respective detection line as a sum of contributions from the at least one basis function arranged on the surface portion;

    calculating a difference value between an observed value for the respective detection line and the projected value for the respective detection line, andupdating the fitted interaction pattern based on an optimization function to minimize the difference value; and

    processing the fitted interaction pattern to determine a touch interaction.

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