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Method and apparatuses for providing uniform electron beams from field emission displays

  • US 20020190663A1
  • Filed: 08/14/2002
  • Published: 12/19/2002
  • Est. Priority Date: 07/17/2000
  • Status: Active Grant
First Claim
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1. A field emission display comprising:

  • a faceplate comprising;

    a transparent screen;

    a cathodoluminescent layer; and

    a transparent conductive anode layer disposed between said transparent screen and said cathodoluminescent layer and biased at an anode voltage;

    a baseplate vacuum sealed to said faceplate comprising;

    an insulating substrate;

    a row electrode disposed upon said insulating substrate and biased to ground voltage;

    a cathode structure disposed upon said row electrode;

    an insulating layer disposed around said cathode structure and upon said row electrode; and

    a column electrode disposed upon said insulating layer; and

    an electron beam uniformity circuit coupled to said column electrode for periodically varying grid voltage about a DC offset sufficient to extract electrons from said cathode structure, said circuit for providing a wave signal with excursions above and below said DC offset.

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