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Movement detection method for multiple objects on a capacitive touchpad

  • US 20070132741A1
  • Filed: 09/13/2006
  • Published: 06/14/2007
  • Est. Priority Date: 12/14/2005
  • Status: Active Grant
First Claim
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1. A movement detection method for multiple objects on a capacitive touchpad, the method comprising the steps of:

  • detecting sensed values on the touchpad for obtaining a waveform of the sensed values when the touchpad is touched;

    identifying the waveform for determining a first peak and a second peak thereof;

    determining a first object and a second object on the touchpad if both of the first peak and the second peak are greater than a first threshold value;

    dividing the waveform for defining a first region and a second region corresponding to the first object and the second object, respectively;

    monitoring a first variation in the sensed values within the first region and a second variation in the sensed values within the second region;

    determining the first object moving on the touchpad if the first variation is greater than a second threshold value; and

    determining the second object moving on the touchpad if the second variation is greater than a third threshold value.

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