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Scanned piezoelectric touch sensor device

  • US 9,501,167 B2
  • Filed: 10/22/2014
  • Issued: 11/22/2016
  • Est. Priority Date: 10/22/2014
  • Status: Active Grant
First Claim
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1. An input device comprisinga plurality of first electrodes;

  • a plurality of second electrodes;

    a plurality of sensing elements, wherein each sensing element comprises;

    a portion of a first electrode;

    a portion of a second electrode; and

    a piezoelectric material disposed between the portion of the first electrode and the portion of the second electrode,wherein each first electrode forms part of two or more sensing elements and each second electrode forms part of two or more sensing elements; and

    a processing system electrically connected to each of the first electrodes and each of the second electrodes, and configured to detect forces applied to one or more of the sensing elements by applying a time-varying electrical excitation signal to at least one of the plurality of first electrodes and detecting a resulting electrical signal on one or more of the second electrodes, and wherein the processing system is further configured to measure an electrical impedance of the piezoelectric material disposed between the portion of the first electrode and the portion of the second electrode for each sensing element.

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