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Geometrically based button discrimination in capacitive sensing applications

  • US 8,600,688 B2
  • Filed: 03/17/2011
  • Issued: 12/03/2013
  • Est. Priority Date: 03/17/2011
  • Status: Expired due to Fees
First Claim
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1. An electronic device, comprising:

  • a first capacitive sensing pad configured to receive first user input;

    wherein the first capacitive sensing pad is configured to generate a first signal based on the first user input,wherein the first signal indicates a size of an area of the first capacitive sensing pad in which the first user input is received;

    a second capacitive sensing pad configured to receive second user input,wherein the second capacitive sensing pad is differently sized than the first capacitive sensing pad;

    wherein the second capacitive sensing pad is configured to generate a second signal based on the second user input,wherein the second signal indicates a size of an area of the second capacitive sensing pad in which the second user input is received;

    processing circuitry,wherein the processing circuitry comprises a first input coupled to the first capacitive sensing pad and the second capacitive pad;

    wherein the first input is configured to additively receive the first signal from the first capacitive sensing pad and the second signal from the second capacitive sensing pad;

    wherein, based on the first input, the processing circuitry is configured to determine the locations of the user inputs on the first and second capacitive pads.

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