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Electroluminescent driving apparatus with photodetector

  • US 6,005,350 A
  • Filed: 02/23/1998
  • Issued: 12/21/1999
  • Est. Priority Date: 02/24/1997
  • Status: Expired due to Term
First Claim
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1. An electroluminescent driving apparatus for causing an electroluminescent element to emit light by repeatedly applying an increased voltage to said electroluminescent element and releasing charges accumulated in said electroluminescent element by said increased voltage applied thereto, said apparatus comprising:

  • voltage increasing means for generating said increased voltage to be applied to said electroluminescent element;

    discharging means for releasing the charges accumulated in said electroluminescent element by said voltage increasing means;

    control means for activating said discharging means when said increased voltage reaches a specified peak voltage; and

    changing means having a photodetector element for sensing ambient brightness, said changing means changing said peak voltage for said control means based on an output from said photodetector element.

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