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Dual resistive strain and pressure sensor for force touch

  • US 10,353,506 B2
  • Filed: 06/16/2017
  • Issued: 07/16/2019
  • Est. Priority Date: 06/16/2017
  • Status: Active Grant
First Claim
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1. An electronic device comprising:

  • an input layer defining an input surface;

    a force-sensing stack coupled to the input layer and operable to detect a force applied to the input surface, the force-sensing stack comprising;

    a strain sensor; and

    a pressure sensor;

    an additional component positioned below the force-sensing stack;

    a compressible gap positioned between the input layer and the additional component and separate from the strain sensor and the pressure sensor; and

    processing circuitry;

    wherein the processing circuitry;

    is coupled to the force-sensing stack to receive a first signal from the strain sensor and to receive a second signal from the pressure sensor;

    determines, using at least one of the first signal and the second signal, whether compression of the compressible gap exceeds a threshold;

    operates in an at least partial strain-sensing mode when compression of the compressible gap exceeds the threshold, the at least partial strain-sensing mode applying first different weights to values of the first signal and values of the second signal to estimate the force applied to the input surface; and

    operates in an at least partial pressure-sensing mode when compression of the compressible gap does not exceed the threshold, the at least partial pressure-sensing mode applying second different weights to values of the first signal and values of the second signal to estimate the force applied to the input surface.

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