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Capacitive Sensing Input Device with Reduced Sensitivity to Humidity and Condensation

  • US 20090135157A1
  • Filed: 11/27/2007
  • Published: 05/28/2009
  • Est. Priority Date: 11/27/2007
  • Status: Abandoned Application
First Claim
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1. A capacitive sensing input device, comprising:

  • at least one substrate;

    a drive electrode disposed on the substrate;

    at least one sense electrode disposed on the substrate and electrically isolated from the drive electrode, at least portions of the sense electrode being separated from the drive electrode by a first gap;

    at least one electrically conductive fixed potential or ground conductor disposed in at least portions of the first gap between the sense electrode and the drive electrode;

    an electrically insulative touch surface disposed above the substrate, the drive electrode and the sense electrode, the touch surface being separated from the drive electrode by a second gap;

    wherein the sense electrode, the drive electrode, the fixed potential or ground conductor and the touch surface are configured respecting one another to at least one of prevent, inhibit and diminish direct electrical coupling through water or water vapor disposed between the sense electrode and the drive electrode or atop, beneath or adjacent to the touch surface.

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