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MUTUAL CAPACITANCE MEASUREMENT IN A MULTI-TOUCH INPUT DEVICE

  • US 20110267309A1
  • Filed: 04/19/2011
  • Published: 11/03/2011
  • Est. Priority Date: 04/30/2010
  • Status: Active Grant
First Claim
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1. A method for determining multiple touch events in a multi-touch sensor system having a capacitance measurement unit, a pulse drive unit, and a touch sensor having a plurality of nodes and a plurality of electrodes comprising at least two sets of electrodes, the method comprising:

  • connecting a first electrode in a first set of electrodes to the capacitance measurement unit;

    driving, with the pulse drive unit, a voltage or current pulse onto a second electrode in a second set of electrodes;

    measuring, with the capacitance measurement unit, the mutual capacitance at a node corresponding to the first and second electrodes; and

    comparing the measured mutual capacitance at the node with a previously measured mutual capacitance corresponding to the node;

    reporting that the node has been touched if there has been a deviation from the previously measured mutual capacitance.

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