Touch-sensing panel and force detection

  • US 10,365,747 B2
  • Filed: 02/18/2019
  • Issued: 07/30/2019
  • Est. Priority Date: 12/02/2010
  • Status: Active Grant
First Claim
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1. A mobile electronic device comprising:

  • a housing;

    a capacitive touch sensing panel comprising;

    a substrate having a first surface;

    a plurality of drive electrodes or sense electrodes of a touch sensor disposed on the first surface;

    a plurality of drive electrodes or sense electrodes of the touch sensor disposed on a second surface,wherein if a plurality of drive electrodes is disposed on the first surface, a plurality of sense electrodes is disposed on the second surface,wherein if a plurality of sense electrodes is disposed on the first surface, a plurality of drive electrodes is disposed on the second surface, andwherein the plurality of drive electrodes is comprised of a clear conductive material;

    a display;

    a cover sheet, wherein the first surface of the substrate is configured to face towards the cover sheet; and

    an optically clear adhesive layer (OCA) disposed between the first surface of the substrate and the cover sheet;

    one or more processors comprising a voltage driver and an integrator circuit, the voltage driver configured to provide an alternating voltage;

    a first variable resistance electrode coupled to an output of the voltage driver and an input of the integrator circuit,wherein the integrator circuit is configured to measure a parameter of the first variable resistance electrode,wherein the first variable resistance electrode is configured to be driven by the alternating voltage provided by the voltage driver, andwherein the first variable resistance electrode is disposed between the capacitive touch sensing panel and the housing;

    the one or more processors configured to determine, based on the measured parameter, an amount of force applied to a sensing area of the capacitive touch sensing panel; and

    the one or more processors further configured to determine whether the amount of force exceeds a first threshold value, and if the amount of force exceeds the first threshold value, cause the mobile electronic device to trigger a first event.

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