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El emittting touch switch

  • US 20090073133A1
  • Filed: 03/14/2008
  • Published: 03/19/2009
  • Est. Priority Date: 09/19/2007
  • Status: Active Grant
First Claim
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1. An EL emitting touch switch, comprising:

  • a plurality of first electrodes having light permeability;

    a second electrode arranged so as to face the plurality of first electrodes, the second electrode functioning as a single electrode associated with the plurality of first electrodes;

    a plurality of EL layers each sandwiched between a corresponding one of the first electrodes and the second electrode, each of the EL layers being a laminate including a phosphor layer and an electrically insulating layer;

    light emission driving means for applying a driving voltage between each of the first electrodes and the second electrode to cause the EL layers to emit light;

    timing signal generating means for generating a timing signal to control the light emission driving means such that the application of the driving voltage is stopped at predetermined intervals; and

    touch decision means provided for each of the first electrodes, each of the touch decision means including a feedback circuit that supplies an electric current to a corresponding one of the first electrodes such that potentials of the corresponding first electrode and the second electrode become equal to each other, and each of the touch decision means detecting contact of a human body with the corresponding first electrode based on operation of the feedback circuit while the application of the driving voltage by the light emission driving means is stopped in accordance with the timing signal.

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