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Adaptive mechanical change compensation for force detector

  • US 10,048,801 B2
  • Filed: 02/29/2016
  • Issued: 08/14/2018
  • Est. Priority Date: 02/29/2016
  • Status: Active Grant
First Claim
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1. A method of operating a capacitive sensing device having a plurality of sensor electrodes and at least one force electrode, the method comprising:

  • storing a baseline capacitance of the force electrode with no force applied to an input surface of the capacitive sensing device;

    determining a first change in capacitance of the force electrode, relative to the baseline capacitance, caused by an input object contacting the input surface;

    determining a mechanical change compensation factor associated with the capacitive sensing device by applying a pre-determined calibration force to the input surface and measuring a second change in capacitance of the force electrode in response to the pre-determined calibration force being applied to the input surface, wherein the mechanical change compensation factor comprises a ratio between the second change in capacitance to an arithmetic product of the pre-determined calibration force times an arithmetic sum of the baseline capacitance plus the second change in capacitance; and

    determining force information for the force electrode based on at least the mechanical change compensation factor, and the first change in capacitance of the force electrode.

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