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Piezoelectric force sensing array

  • US 9,262,003 B2
  • Filed: 11/04/2013
  • Issued: 02/16/2016
  • Est. Priority Date: 11/04/2013
  • Status: Active Grant
First Claim
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1. A touch sensing system including a force-sensing device, the force-sensing device comprising:

  • a substrate;

    an array of sensor pixel circuits disposed on the substrate;

    discrete elements of a piezoelectric film layer, each discrete element corresponding with an individual sensor pixel circuit;

    a plurality of pixel input electrodes, each pixel input electrode configured for making an electrical connection between a first side of a discrete element of the piezoelectric layer and one of the sensor pixel circuits;

    a receiver bias electrode configured for making an electrical connection with a second side of discrete elements of the piezoelectric layer; and

    a control system capable of;

    receiving a signal from one or more of the sensor pixel circuits, the signal corresponding to a force applied to one or more discrete elements of the piezoelectric film layer; and

    determining a location of an object exerting the force.

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