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Determining Touch Locations and Forces Thereto on a Touch and Force Sensing Surface

  • US 20140210791A1
  • Filed: 04/16/2014
  • Published: 07/31/2014
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A method for decoding multiple touches and forces thereof on a touch sensing surface, said method comprising the steps of:

  • scanning a plurality of channels aligned on an axis for determining self capacitance values of each of the plurality of channels;

    comparing the self capacitance values to determine which one of the channels has a local maximum self capacitance value;

    scanning a plurality of nodes of the at least one channel having the local maximum self capacitance value for determining mutual values of the nodes;

    comparing the mutual values to determine which one of the nodes has the largest mutual capacitance value, wherein the node having the largest mutual capacitance value on the local maximum self capacitance value channel is a potential touch location; and

    determining a force at the potential touch location from a change in the mutual capacitance values of the node at the potential touch location during no touch and during a touch thereto.

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