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Capacitive sensing during non-display update times

  • US 9,946,423 B2
  • Filed: 01/09/2017
  • Issued: 04/17/2018
  • Est. Priority Date: 09/07/2011
  • Status: Active Grant
First Claim
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1. A processing system for a display device comprising a plurality of common electrodes, at least one of the plurality of common electrodes comprised by a plurality of sensor electrodes and configured to be driven for updating a display of the display device and capacitive sensing, during a display frame, the processing system comprising:

  • a driver module comprising driver circuitry, the driver module configured to couple to the plurality of sensor electrodes, wherein the display frame comprises a plurality of display line update periods, a plurality of first blanking periods, and a plurality of second blanking periods, wherein the plurality of first blanking periods includes horizontal blanking periods occurring at the end of corresponding ones of the plurality of display line update periods and the plurality of second blanking periods includes capacitive sensing periods, wherein each of the plurality of second blanking periods occurs between respective clusters of the plurality of display line update periods, each cluster comprising at least two of the plurality of display line update periods, and wherein each of the plurality of second blanking periods is longer than each of the plurality of first blanking periods, andwherein the driver module is configured to drive a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a first one of the plurality of second blanking periods.

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