Organic electoluminescent display panel and method for manufacturing the same

• US 5,701,055 A
• Filed: 03/12/1996
• Issued: 12/23/1997
• Est. Priority Date: 03/13/1994
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Miyaguchi, Satoshi, Nagayama, Kenichi
• Primary Examiner(s): O'Shea, Sandra L.
• Assistant Examiner(s): HAYNES, MACK NELSON
• Application Number:
  US08/614,316
• Time in Patent Office: 651 Days
• Field of Search: 313/484, 313/504-509, 313/511, 313/512, 313/251-53, 313/257, 313/283-84, 313/287, 313/292, 313/245, 313/250, 313/268, 313/238-39, 313/243
• US Class Current: 313/504
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

An organic electroluminescent display panel having a plurality of emitting portions includes; a substrate on which a plurality of first display electrodes corresponding to emitting portions are formed; electrical insulation ramparts projecting from the substrate for exposing at least portions of the first display electrodes respectively; organic function layers each including at least one organic electroluminescent medium formed on exposed portions of the first display electrodes; second display electrodes formed on the organic function layers; and each electrical insulation rampart having an overhanging portion projecting in a direction parallel to the substrate. The cathodes are patterned automatically without use of the photolithography.

Claims

1. An organic electroluminescent display panel having a plurality of emitting portions comprising;

a substrate on which a plurality of first display electrodes corresponding to emitting portions are formed;

electrical insulation ramparts projecting from the substrate for exposing at least portions of the first display electrodes respectively;

organic function layers each including at least one organic electroluminescent medium formed on exposed portions of the first display electrodes;

second display electrodes formed on the organic function layers; and

each electrical insulation rampart having an overhanging portion projecting in a direction parallel to the substrate.

2. An organic electroluminescent display panel as set forth in claim 1 and further comprising;

an insulative layer formed on portions of the first display electrodes to be under said overhanging portion and/or edges of the exposed portions of the first display electrodes.

3. An organic electroluminescent display panel as set forth in claim 1 and further comprising;

an insulative sealing film entirely formed on the first display electrode, the organic function layers and the second display electrode; and

at least the second display electrode being covered as a whole with the insulative sealing film.

4. An organic electroluminescent display panel as set forth in claim 1 and further comprising;

an insulative sealing film entirely formed on the first display electrode, the organic function layers and the second display electrode; and

at least the organic function layers being covered as a whole with the insulative sealing film.

5. An organic electroluminescent display panel as set forth in claim 1, wherein said first and the second display electrodes are formed as stripes respectively, and each first display electrode is arranged perpendicular to each second display electrode.

6. An organic electroluminescent display panel as set forth in claim 1, wherein said substrate and said first display electrode are transparent.

7. An organic electroluminescent display panel as set forth in claim 6 and further comprising;

a reflective film formed on said second display electrode.

8. An organic electroluminescent display panel as set forth in claim 1, wherein said second display electrode is transparent.

9. An organic electroluminescent display panel as set forth in claim 8 and further comprising a reflective film formed on the first display electrode at the outerside.

10. An organic electroluminescent display panel as set forth in claim 2 and further comprising;

an insulative sealing film entirely formed on the first display electrode, the organic function layers and the second display electrode; and

at least the second display electrode being covered as a whole with the insulative sealing film.