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Active matrix OED array with improved OED cathode

  • US 5,998,805 A
  • Filed: 12/11/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 12/11/1997
  • Status: Expired due to Term
First Claim
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1. An active matrix organic light emitting device array with improved device cathode comprising:

  • a substrate having an array area defined thereon;

    a plurality of control transistors formed on the substrate in the array area;

    a planarizing layer of insulating material positioned over the plurality of control transistors in the array area and defining a substantially planar surface;

    a plurality of contact pads formed on the planar surface of the planarizing layer in the array area, the plurality of contact pads being electrically coupled with the plurality of control transistors;

    an electron injecting layer of one of alkaline metal oxide and alkaline metal fluoride positioned on each contact pad of the plurality of contact pads;

    a plurality of layers of organic material sequentially formed in overlying relationship on each of the electron injecting layers in the array area so as to define an organic light emitting device on each contact pad with each contact pad operating as a first terminal of an overlying organic light emitting device; and

    electrical and light conducting material positioned in overlying relationship over the layers of organic material in the array area and defining a second terminal of each of the organic light emitting devices.

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