Organic electroluminescent display with three kinds of layer-stacked devices

• US 6,462,470 B1
• Filed: 01/28/2002
• Issued: 10/08/2002
• Est. Priority Date: 01/13/1999
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Yamaguchi, Yoshikazu, Ootsuki, Shigeyoshi
• Primary Examiner(s): Patel, Ashok
• Assistant Examiner(s): Roy, Sikha
• Application Number:
  US10/055,990
• Publication Number:
  US 20020072292A1
• Time in Patent Office: 253 Days
• Field of Search: 313/504, 313/502, 313/503, 313/505, 313/506, 313/512, 445/24
• US Class Current: 313/504
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/16 using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
• CPC Class Codes: H10K 71/40 Thermal treatment, e.g. annealing in the presence of a solvent vapour

Abstract

A transparent electrode and a hole transporting layer are formed on an anode board. Three kinds of layer-stacked devices each emitting light having one of primary colors of red, green and blue, composed of a metal strip and an organic electroluminescent layer covering around the metal strip are then formed. These layer-stacked devices are mounted on an insulation board in a manner that the organic electroluminescent layer faces upward. Then, the anode board and the insulation board are overlaid each other so that the transparent electrode intersects the layer-stacked device and that the hole transporting layer and the organic electroluminescent layer are opposed to each other.

Claims

1. An organic electroluminescent display device comprising:

a plurality of line-like transparent electrodes spreading in a first direction;

an anode board having a hole transporting layer formed on said transparent electrode;

an insulation board disposed opposite to said anode board; and

three kinds of layer-stacked devices having organic electroluminescent layers each emitting a different color light, which are disposed between said anode board and said insulation board;

whereby each of said three kinds of layer-stacked devices is composed of a piece of strip-like metal, a metal cathode formed on a surface of a piece of said strip-like metal and organic electroluminescent layers, formed on said metal cathode, each emitting a red, green or blue color light, wherein said organic electroluminescent layers are arranged on the side of said anode board in a second direction in which a longitudinal direction of said organic electroluminescent layers intersects said first direction.

2. The organic electroluminescent display device according to claim 1, wherein said layer-stacked device is composed of a piece of strip-like metal, a metal cathode formed on a piece of said metal and an organic electroluminescent layer formed on said metal cathode emitting red, green or blue light.

3. The organic electroluminescent display device according to claim 1, wherein said metal electrode has a low work function.

4. The organic electroluminescent display device according to claim 2, wherein bumps and dips are formed on a surface of a piece of said metal to cause light to be reflected irregularly.