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Force determination employing sheet sensor and capacitive array

  • US 10,379,657 B2
  • Filed: 05/24/2018
  • Issued: 08/13/2019
  • Est. Priority Date: 02/12/2014
  • Status: Active Grant
First Claim
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1. An electronic device, comprising:

  • a cover;

    a display disposed within the electronic device and visible through the cover;

    a force-sensing structure disposed within the electronic device on one side of the cover, comprising;

    a first capacitive electrode;

    a second capacitive electrode; and

    a compressible element disposed between the first and second capacitive electrodes; and

    a sheet sensor positioned on a side of the display opposite the cover and configured to be engaged by the display when a sufficient force is applied at a region of the cover away from an edge of the cover,wherein;

    the force-sensing structure and sheet sensor have different force sensing ranges;

    at least before the display engages the sheet sensor, the force-sensing structure is configured to produce a first output corresponding to a capacitive change of the force-sensing structure, the capacitive change of the force-sensing structure indicating an amount of force applied to the cover; and

    after the display engages the sheet sensor, the sheet sensor is configured to produce a second output corresponding to a capacitive change of the sheet sensor, the capacitive change of the sheet sensor indicating the amount of force applied to the cover.

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