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TOUCH PAD DEVICE AND METHOD FOR DETERMINING A POSITION OF AN INPUT OBJECT ON THE DEVICE USING CAPACITIVE COUPLING

  • US 20100147600A1
  • Filed: 12/11/2008
  • Published: 06/17/2010
  • Est. Priority Date: 12/11/2008
  • Status: Active Grant
First Claim
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1. A touch pad device comprising:

  • a substrate having opposing first and second surfaces;

    a drive electrode and multiple sensing electrodes on the second surface;

    a plurality of conductors on the first surface, each of the conductors being positioned on the first surface such that portions of at least two of the multiple sensing electrodes are situated directly across that conductor on the second surface;

    a drive circuit configured to generate a drive signal, the drive circuit being electrically connected to the drive electrode to supply the drive signal to the drive electrode to generate coupling signals in the multiple sensing electrodes, the coupling signals being dependent on any electrical contact between an input object and at least one of the conductors;

    multiple signal measuring units electrically connected to the multiple sensing electrodes to measure the coupling signals in the multiple sensing electrodes and to produce output signals; and

    a processing unit connected to the multiple signal measuring units to process the output signals to determine which of the conductors is being electrically contacted by the input object to determine a position of the input object.

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