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METHOD AND APPARATUS FOR USING OSCILLATION SIGNALS WITH DIFFERENT PHASES TO DETECT CAPACITANCE VALUES AT CAPACITIVE SENSING NODES OF TOUCH PANEL

  • US 20130285976A1
  • Filed: 12/18/2012
  • Published: 10/31/2013
  • Est. Priority Date: 04/30/2012
  • Status: Active Grant
First Claim
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1. A method for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel, comprising:

  • obtaining a plurality of touch sense signals corresponding to the sense line during a plurality of time slots, respectively;

    demodulating the touch sense signals with a first oscillation signal to generate a plurality of first demodulated signals;

    demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and

    determining the capacitance values according to at least the first demodulated signals and the second demodulated signals.

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