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Orthogonal frequency scan scheme in touch system

  • US 9,678,609 B2
  • Filed: 10/21/2013
  • Issued: 06/13/2017
  • Est. Priority Date: 10/21/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • drive circuitry operable to generate a plurality of stimulation signals having a plurality of orthogonal frequencies, each orthogonal frequency of the plurality of orthogonal frequencies being a different frequency, the plurality of stimulation signals for simultaneously driving a plurality of drive electrodes of a touch sensor, wherein frequencies of the plurality of orthogonal frequencies are separated by a frequency that is inversely proportional to an integration time of the touch sensor.

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