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CAPACITIVE FINGER NAVIGATION INPUT DEVICE

  • US 20120105325A1
  • Filed: 10/27/2010
  • Published: 05/03/2012
  • Est. Priority Date: 10/27/2010
  • Status: Abandoned Application
First Claim
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1. A capacitive finger navigation input device comprising:

  • a capacitive sensor array of capacitive sensing cells, the capacitive sensor array including only two capacitive sensing cells positioned along a linear direction, the capacitive sensor array including;

    a substrate;

    at least one drive electrode positioned over the substrate;

    at least one sense electrode positioned over the substrate and electrically separated from the at least one drive electrode, where at least a portion of the at least one drive electrode and at least a portion of the at least one sense electrode define each of the capacitive sensing cells; and

    an insulating cover layer positioned over the drive and sense electrodes, the insulating cover layer being positioned to interface with a finger of a user;

    a drive circuit electrically connected to the at least one drive electrode to supply a drive signal to the at least drive electrode;

    a sensing circuit electrically connected to the at least one sense electrode to sense mutual capacitance at each of the capacitive sensing cells to produce mutual capacitance signals; and

    a navigation engine connected to the sensing circuit to receive the mutual capacitance signals, the navigation engine being configured to process the mutual capacitance signals for the capacitive sensing cells of the capacitive sensor array to determine at least one of position and movement of a finger of a user with respect to the capacitive sensor array.

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