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METHOD AND APPARATUS FOR OPERATING A TOUCH PANEL

  • US 20100214232A1
  • Filed: 02/23/2009
  • Published: 08/26/2010
  • Est. Priority Date: 02/23/2009
  • Status: Active Grant
First Claim
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1. A controller for detection of touches by a single finger or multiple fingers on a touch panel, the touch panel including a first group of electrodes arranged in a first direction and a second group of electrodes arranged in a second direction, thereby forming a plurality of crossover points, the controller comprising:

  • a plurality of signal drivers coupled to the first group of electrodes and configured to excite the first group of electrodes sequentially using a spread spectrum signal;

    a plurality of signal sensors coupled to the second group of electrodes and configured to detect peaks and troughs of capacitive coupled signals at the second group of electrodes, the detecting being performed simultaneously for the crossover points along a current one of the first group of electrodes that is being excited; and

    a signal processing device configured to detect the touches on the touch panel and to determine touch positions and touch movements, based on the detected peaks and troughs of the capacitive coupled signals.

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