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Display device

  • US 7,298,347 B2
  • Filed: 01/21/2003
  • Issued: 11/20/2007
  • Est. Priority Date: 06/13/2000
  • Status: Expired due to Fees
First Claim
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1. An active matrix EL display device comprising:

  • a plurality of pixels each having a thin film transistor connected to an EL element;

    a constant current generator;

    a monitoring EL element for monitoring a change in amount of current flowing into the EL element of a pixel, wherein the monitoring EL element has at least a first electrode, a second electrode and an EL layer between the first electrode and the second electrode; and

    a buffer amplifier having a non-inversed input terminal, an inversed input terminal and an output terminal,wherein the EL element of a pixel is electrically connected to the output terminal of the buffer amplifier, andwherein the non-inversed input terminal of the buffer amplifier is electrically connected to the first electrode of the monitoring EL element.

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