# US 2018/0026086 A1 · Light-emitting element and display device using same

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- Number: US 2018/0026086 A1
- Document ID: US20180026086A1
- Status: Published application
- Kind: A1
- Application number: 15/708,870
- Filed: 2017-09-19
- Published: 2018-01-25
- Earliest claimed: 2002-12-12
- Assignees: Japan Display Inc.; Panasonic Liquid Crystal Display Co., Ltd.
- Applicants: Japan Display Inc.; Panasonic Liquid Crystal Display Co., Ltd.
- Inventors: Masaya ADACHI; Kazutaka TSUJI; Hajime MURAKAMI; Etsuko NISHIMURA
- Web page: https://patentgrep.com/patent/US20180026086A1

## CPC

- H05B 33/04: Sealing arrangements {, e.g. against humidity}
- H05B 33/02: Details
- H05B 33/14: 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}
- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/1216: {the pixel elements being capacitors}
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/8722: {Peripheral sealing arrangements, e.g. adhesives, sealants}
- H10K 59/878: {comprising reflective means}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/8051: {Anodes}
- H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers}
- H10K 59/8723: {Vertical spacers, e.g. arranged between the sealing arrangement and the OLED}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K 2102/3026: {Top emission}
- H10K 2102/321: {Inverted OLED, i.e. having cathode between substrate and anode}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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.

### Claim 13 (depends on 12)

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