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Varying demodulation to avoid interference

  • US 9,805,692 B2
  • Filed: 02/24/2011
  • Issued: 10/31/2017
  • Est. Priority Date: 02/26/2010
  • Status: Active Grant
First Claim
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1. A method of interference avoidance for a capacitive sensor device, said method comprising:

  • transmitting a transmitter signal with a transmitter electrode of said capacitive sensor device such that said transmitter signal comprises at least two transitions that occur during a non-display update time period that occurs between updates of consecutive rows within a display frame of a display device, wherein said display device at least partially overlaps a sensing region of said capacitive sensor device;

    receiving a resulting signal with a receiver electrode of said capacitive sensor device, said resulting signal corresponds to said transmitter signal;

    acquiring a first demodulated output by demodulating said resulting signal in a first way;

    acquiring a second demodulated output by demodulating said same resulting signal in a second way, wherein said second way and said first way differ in one of frequency of sampling and phase of sampling of said same resulting signal; and

    shifting from using said first demodulated output for determining positional information to using said second demodulated output for determining positional information, wherein said shifting is based at least in part upon an amount of interference.

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