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Multiple simultaneous frequency detection

  • US 20080309625A1
  • Filed: 06/13/2007
  • Published: 12/18/2008
  • Est. Priority Date: 06/13/2007
  • Status: Active Grant
First Claim
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1. A method for obtaining a plurality of values used to generate an image of touch from a touch sensor panel, comprising:

  • simultaneously applying a plurality of stimulation frequencies having positive and negative phases to a plurality of drive lines of the touch sensor panel in a particular distribution;

    receiving a signal from each of a plurality of sense lines of the touch sensor panel into a different sense channel;

    demodulating the signal received into each sense channel with a plurality of demodulation frequencies, the demodulation frequencies being the same frequencies as the stimulation frequencies but in-phase;

    accumulating the signals demodulated with the plurality of demodulation frequencies in each sense channel to generate a plurality of values representing the accumulated demodulated signals for each sense channel; and

    storing the plurality of values for all sense channels.

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