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METHOD OF DYNAMICALLY SHIELDING A CAPACITIVE TOUCH SYSTEM AGAINST INTERFERENCE CAUSED BY NEAR FIELD COMMUNICATION RADIO FREQUENCY EMISSION

  • US 20170249032A1
  • Filed: 02/27/2017
  • Published: 08/31/2017
  • Est. Priority Date: 02/25/2016
  • Status: Active Grant
First Claim
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1. A method for reducing interference of a near field communication antenna in close proximity to a touch sensor, said method comprising:

  • providing a touch sensor formed from a plurality of electrodes;

    selecting electrodes that are disposed around a perimeter of the touch sensor as perimeter electrodes that are individually addressable in order to send a signal only to the perimeter electrodes, and wherein all remaining electrodes as interior electrodes;

    providing a first mode of operation of the touch sensor wherein the perimeter electrodes and the interior electrodes both operate to receive touch data;

    providing a second mode of operation of the touch sensor wherein the perimeter electrodes receive a signal that shields the interior electrodes so that the interior electrodes receive touch data; and

    operating the touch sensor in the first mode of operation when there is no electromagnetic interference caused by the near field communication antenna, and operating the touch sensor in the second mode of operation when there is electromagnetic interference from the near field communication antenna.

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