Light-emitting element having picture elements

Patent metadata

Field	Value
Publication number	US-9966421-B2
Application number	US-201715708870-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Dec 12, 2002
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A display device includes a plurality of light-emitting elements aligned on a TFT substrate in a formation of a matrix. The plurality of light-emitting elements each have a flat surface portion and including a light-emitting layer, an anode, and a cathode, an insulating layer formed on the TFT substrate and under the light emitting element, and a tilted metal surface provided on a peripheral area surrounding the flat surface portion of the light-emitting element and having a tilt angle with respect to the flat surface portion of the light-emitting element. The tilted metal surface is provided on a surface of a slope of a bank that is provided on the insulation layer, and a width of a cross-section of the bank becomes smaller as the cross section conies farther away from a surface of the TFT substrate. A counter substrate is placed on the TFT substrate.

First claim

What is claimed is:

1. A light-emitting element having picture elements comprising:
a bank surrounding a central area and including a slope;
a metal cathode overlaying the slope;
an anode formed in the central area; and
an organic layer including a light-emitting layer formed on the anode in the central area, wherein
the organic layer is separated corresponding to each of the picture elements.

2. The light-emitting element according to claim 1 , further comprising:
an electron transporting layer between the metal cathode and the light-emitting layer and
a hole transporting layer between the electron transporting layer and the anode.

3. The light-emitting element according to claim 1 , further comprising:
an optical waveguide layer surrounded by the bank.

4. The light-emitting element according to claim 1 , wherein
the anode is a transparent electrode.

5. The light-emitting element according to claim 1 , further comprising:
a metal film deposited on the anode.

6. The light-emitting element according to claim 1 , further comprising a substrate, wherein
the bank has a cross sectional shape of a narrower width measured at a point farther from the substrate, and
the bank has the slope at each of side areas.

7. The light-emitting element according to claim 1 , wherein
the organic layer is formed in a form of an island and overlaps with the anode.

8. The light-emitting element according to claim 1 , wherein
the picture elements are configured to emit respective red-, green- and blue-light.

9. The light-emitting element according to claim 1 , wherein
the organic layer is configured to be divided into a red-color pixel, a green-color pixel and a blue-color pixel.

10. The light-emitting element according to claim 1 , wherein
the picture elements are aligned in a predetermined order in a matrix formation.

11. The light-emitting element according to claim 1 , wherein
the bank functions as a torus isolating an area of the picture element.

12. The light-emitting element according to claim 1 , further comprising:
a seal-off material on the metal cathode, wherein
lights emitted from the light emitting layer pass through the seal-off material.

13. The light-emitting element according to claim 12 , wherein
viewers see the lights after passing the seal-off material.

Assignees

• Japan Display Inc
• Panasonic Liquid Crystal Displ
• Panasonic Liquid Crystal Displ

Inventors

• Adachi Masaya
• Tsuji Kazutaka
• Murakami Hajime
• Nishimura Etsuko

Classifications

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• H01L27/3258 Primary

  Electricity · mapped topic

• H01L51/5234

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic

• H01L51/5246

  Electricity · mapped topic