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Shifting carrier frequency to avoid interference

  • US 9,922,622 B2
  • Filed: 02/24/2011
  • Issued: 03/20/2018
  • Est. Priority Date: 02/26/2010
  • Status: Active Grant
First Claim
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1. A method of avoiding interference in an integrated capacitive sensor device and display device, said method comprising:

  • transmitting a first transmitter signal having a first frequency with a combination electrode of said integrated capacitive sensor device and display device, wherein said combination electrode is configured for both capacitive sensing and display updating;

    shifting from transmitting said first transmitter signal with said combination electrode to transmitting a second transmitter signal with said combination electrode by changing a duration of at least one non-display update time period of said display device without changing a refresh rate of said display device, said at least one non-display update time period comprising a non-display update time period at an end of a pixel update between display pixel rows to change a horizontal row timing, wherein said second transmitter signal has a second frequency, and wherein said shifting occurs based at least in part upon an amount of interference; and

    sharing a synchronization signal indicating the horizontal row timing between the capacitive sensor device and the display device.

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