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Force sensing capacitive hybrid touch sensor

  • US 9,454,268 B2
  • Filed: 09/28/2011
  • Issued: 09/27/2016
  • Est. Priority Date: 10/12/2010
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving a first plurality of capacitance measurements that are measured from a plurality of sensor elements affected by a first contact at a touch-sensing surface that overlays a display panel;

    wherein the touch-sensing surface is flexible and includes a flexible overlay, a flexible substrate, and the plurality of sensor elements, the plurality of sensor elements being positioned between the flexible substrate and the flexible overlay, the touch-sensing surface being configured to deflect more with respect to the display panel in proximity to the first contact than remotely from the first contact and thereby modify capacitances of a first subset of the plurality of displaced sensor elements proximate to the first contact;

    selecting, from the first plurality of capacitance measurements, a first capacitance measurement corresponding to a first sensor element that is a predetermined distance from a second sensor element associated with a peak capacitance value, wherein the first sensor element and the second sensor element are within a same set of rows or columns separated by the predetermined distance;

    determining a magnitude of a first force applied to the touch-sensing surface at a location of the first contact based on location coordinates, which correspond to the location of the first contact on the touch-sensing surface, and on the first capacitance measurement; and

    obtaining a corrected coordinate location for the first contact based on the magnitude of the first force.

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