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Multi-touch disambiguation

  • US 8,462,135 B1
  • Filed: 01/08/2010
  • Issued: 06/11/2013
  • Est. Priority Date: 01/08/2009
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • performing a first scan of a plurality of sensor elements to detect a plurality of capacitances indicating a presence of multiple contacts at a touch sensing surface;

    calculating a plurality of coordinates based on the plurality of capacitances, wherein the plurality of coordinates includes a plurality of row coordinates and a plurality of column coordinates, wherein the plurality of row coordinates and plurality of column coordinates indicate a plurality of possible contact locations for the multiple contacts;

    in response to detecting the plurality of coordinates, performing a resolve scan of at least a first sensor element at the touch sensing surface, wherein the first sensor element corresponds to at least a first coordinate of the plurality of coordinates and wherein the resolve scan comprises;

    detecting a first time constant at the first end of the first sensor element while the second end of the first sensor element is connected to a high impedance; and

    detecting a second time constant at the second end of the first sensor element while the first end of the first sensor element is connected to a high impedance; and

    based on the resolve scan, identifying at least one of the possible contact locations as an actual contact location.

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