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Differential force and touch sensing

  • US 10,073,560 B2
  • Filed: 04/28/2017
  • Issued: 09/11/2018
  • Est. Priority Date: 04/29/2016
  • Status: Active Grant
First Claim
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1. A processing system for an input device, comprising:

  • sensor circuitry configured to;

    acquire first resulting signals by driving a plurality of sensor electrodes with a first modulated voltage, the plurality of sensor electrodes disposed between an input surface of the input device and a force electrode and configured to deflect toward the force electrode in response to a force applied to the input surface; and

    acquire a second resulting signal, while the plurality of sensor electrodes are driven with the first modulated voltage, by driving the force electrode with a second modulated voltage, wherein the second modulated voltage is partially out of phase with respect to the first modulated voltage; and

    a determination module, coupled to the sensor circuitry, configured to;

    determine positional information for an input object based on the first and second resulting signals; and

    determine force information for the input object based on the second resulting signal.

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