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Classifying input objects interacting with a capacitive button

  • US 9,304,643 B2
  • Filed: 06/24/2014
  • Issued: 04/05/2016
  • Est. Priority Date: 06/24/2014
  • Status: Active Grant
First Claim
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1. An input device, comprising:

  • a first plurality of sensor electrodes;

    a second plurality of sensor electrodes;

    a processing system communicatively coupled to the first and second plurality of sensor electrodes, the processing system configured to;

    operate the first plurality of sensor electrodes to detect positional information for an input object in a first sensing region;

    operate the second plurality of sensor electrodes to detect a presence of the input object in a second sensing region by;

    driving a capacitive sensing signal to detect the input object onto at least one of the second plurality of sensor electrodes,receiving a first resulting signal and a second resulting signal on one or more sensor electrodes of the second plurality of sensor electrodes based on driving the capacitive sensing signal, anddetermining whether the input object is contacting the second sensing region based on a ratio between the first and second resulting signals.

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