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Frequency shifting for simultaneous active matrix display update and in-cell capacitive touch

  • US 9,442,615 B2
  • Filed: 09/30/2014
  • Issued: 09/13/2016
  • Est. Priority Date: 10/02/2013
  • Status: Active Grant
First Claim
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1. An input device comprising:

  • a plurality of display electrodes;

    a plurality of sensor electrodes; and

    a processing system coupled with the plurality of display electrodes and with the plurality of sensor electrodes, wherein the processing system is configured to;

    drive a display signal onto at least one of the plurality of display electrodes for updating pixels of a display,drive, during a first period that at least partially overlaps with driving the display signal for updating pixels of the display, a first capacitive sensing signal having a first frequency onto at least one sensor electrode of the plurality of sensor electrodes, wherein the first frequency is synchronized with the display signal, anddrive, during a second period that at least partially overlaps with driving the display signal for updating pixels of the display, a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ; and

    adjusting a timing of the display signal to maintain synchronization of the display signal with the second frequency.

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