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Capacitive touch buttons combined with electroluminescent lighting

  • US 8,638,314 B2
  • Filed: 07/29/2009
  • Issued: 01/28/2014
  • Est. Priority Date: 10/17/2008
  • Status: Active Grant
First Claim
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1. A capacitive touch sensor comprising:

  • a substrate;

    a layer of electro-luminescent (EL) material arranged between a first electrode and a second electrode; and

    a controller comprising a capacitance sensing circuit coupled to at least one of the first and second electrodes and arranged to measure a capacitive coupling associated therewith, wherein the controller is further operable to apply an EL drive signal across the first and second electrodes to cause the layer of EL material between the electrodes to illuminate, the substrate distinct from the EL material and positioned between the first electrode and second electrode.

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