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Single layer transcapacitive sensing

  • US 8,415,959 B2
  • Filed: 07/30/2010
  • Issued: 04/09/2013
  • Est. Priority Date: 09/11/2009
  • Status: Active Grant
First Claim
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1. A transcapacitive sensor device comprising:

  • a sensor substrate;

    a first set of sensor electrodes disposed on a first surface of said sensor substrate, wherein individual sensor electrodes of said first set of sensor electrodes are substantially parallel to a first axis, and wherein said individual sensor electrodes of said first set of sensor electrodes are substantially identical to one another;

    a second set of sensor electrodes disposed on said first surface of said sensor substrate, said second set of sensor electrodes comprising a rotated mirror symmetric version of said first set of sensor electrodes, said second set of sensor electrodes disposed parallel to said first axis;

    a third set of sensor electrodes disposed on said first surface of said sensor substrate between sensor electrodes of said first set and said second set of sensor electrodes, wherein at least one sensor electrode of said third set of sensor electrodes comprises a rectangular shape with a long side aligned parallel to said first axis,wherein said first set and said third set of sensor electrodes are configured for providing a first capacitive coupling therebetween that varies substantially along said first axis, wherein said second set and said third set of sensor electrodes are configured for providing a second capacitive coupling therebetween that varies substantially inversely to said first capacitive coupling along said first axis, and wherein said first set, second set and third set of sensor electrodes are all disposed in a single layer; and

    a processing system coupled to said first set of sensor electrodes, said second set of sensor electrodes, and said third set of sensor electrodes, wherein said processing system is configured for;

    acquiring a first capacitive measurement by emitting a first electrical signal with at least one sensor electrode of said first set of sensor electrodes and receiving said first electrical signal with at least one sensor electrode of said third set of sensor electrodes;

    acquiring a second capacitive measurement by emitting a second electrical signal with said second set of sensor electrodes and receiving said second electrical signal with said at least one sensor electrode of said third set of sensor electrodes; and

    determining positional information related to an external input object based on said first capacitive measurement and said second capacitive measurement, wherein said positional information comprises at least a position of said input object along said first axis.

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