Display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11302758-B2
Application number	US-201916598604-A
Country	US
Kind code	B2
Filing date	Oct 10, 2019
Priority date	Nov 26, 2018
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

A display device includes a light-emitting element on a light-emitting area of a substrate; a thin film transistor connected to the light-emitting element; a first insulating layer between the light-emitting element and the thin film transistor; and a second insulating layer which defines the light-emitting area and is between the thin film transistor and the second insulating layer. The first insulating layer includes a first area corresponding to the light-emitting area and a second area outside the light-emitting area, the first area has a first thickness, and the second area has a second thickness which is less than the first thickness, in a same one light-emitting area, the second insulating layer covers a lateral surface of the first area of the first insulating layer, and a height of the second insulating layer decreases along a direction from the first area to the second area.

First claim

What is claimed is:

1. A display device comprising:
a substrate comprising a display area in which a light-emitting area is provided in plurality spaced apart from each other;
a light-emitting element on the substrate, in a respective light-emitting area among the plurality of light-emitting areas; and
in order from the substrate:
a thin film transistor electrically connected to the light-emitting element;
a first insulating layer between the light-emitting element and the thin film transistor; and
a second insulating layer which defines an opening corresponding to the light-emitting element, the opening of the second insulating layer defining the respective light-emitting area,

wherein
the first insulating layer comprises a first area corresponding to the respective light-emitting area which is defined by the opening in the second insulating layer, and a second area disposed outside the respective light-emitting area,
the first area of the first insulating layer has a first thickness, and the second area of the first insulating layer has a second thickness which is less than the first thickness,
in a same one of the respective light-emitting area, the second insulating layer which defines the opening covers a lateral surface of the first area of the first insulating layer,
a thickness of the second insulating layer which defines the opening and covers the lateral surface of the first area of the first insulating layer decreases along a direction from the first area to the second area, and
the first insulating layer is a single layer.

2. A display device comprising:
a substrate comprising a display area in which a light-emitting area is provided in plurality spaced apart from each other including a plurality of light-emitting areas;
a light-emitting element on the substrate, in a respective light-emitting area among the plurality of light-emitting areas;
a thin film transistor electrically connected to the light-emitting element;
an organic first insulating layer between the light-emitting element and the thin film transistor and extended between light-emitting areas adjacent to each other among the plurality of light-emitting areas, the organic first insulating layer comprising:
an extension portion between the light-emitting areas adjacent to each other,
the extension portion extended to define a first portion of the organic first insulating layer which corresponds to each of the light-emitting areas adjacent to each other, and
a thickness of the extension portion between the light-emitting areas adjacent to each other less than a thickness of the first portion which corresponds to each of the light-emitting areas adjacent to each other,
wherein the organic first insulating layer is a single layer; and

a second insulating layer which defines the respective light-emitting area, the first insulating layer being between the thin film transistor and the second insulating layer,
wherein within the organic first insulating layer, the thickness of the first portion extends further from the substrate than the thickness of the extension portion.

3. The display device of claim 1 , wherein
the light-emitting element comprises a pixel electrode disposed corresponding to the first area of the first insulating layer, and
the second insulating layer covers edges of the pixel electrode.

4. The display device of claim 3 , wherein an upper surface of the first area of the first insulating layer is planar.

5. A display device comprising:
a substrate comprising a display area in which a light-emitting area is provided in plurality spaced apart from each other;
a light-emitting element on the substrate, in a respective light-emitting area among the plurality of light-emitting areas;
a thin film transistor electrically connected to the light-emitting element;
a first insulating layer between the light-emitting element and the thin film transistor; and
a second insulating layer which defines the respective light-emitting area, the first insulating layer being between the thin film transistor and the second insulating layer,
wherein
the first insulating layer comprises a first area corresponding to the respective light-emitting area and a second area disposed outside the respective light-emitting area,
the first area of the first insulating layer has a first thickness, and the second area of the first insulating layer has a second thickness which is less than the first thickness, and
the second insulating layer exposes an upper surface of the second area of the first insulating layer to outside the second insulating layer.

6. The display device of claim 5 , wherein an end portion of the second insulating layer exposes the upper surface of the second area of the first insulating layer to outside the second insulating layer and has a concave curved surface.

7. The display device of claim 5 , wherein the light-emitting element comprises a common electrode which is in direct contact with the upper surface of the second area of the first insulating layer which is exposed to outside the second insulating layer.

8. The display device claim 1 , wherein
the second insulating layer comprises:
a lateral surface which defines the opening,
a first thickness portion which covers the lateral surface of the first area of the first insulating layer, and
a second thickness portion which extends from the first thickness portion, is outside of the first area of the first insulating layer and corresponds to the second area thereof,

a thickness of the second thickness portion of the second insulating layer decreases along the direction from the first area to the second area,
the second thickness portion of the second insulating layer defines an extension portion having a minimum thickness within the second area of the first insulating layer, the extension portion defining an upper surface which is furthest from the substrate, and
the upper surface of the extension portion is closer to the substrate than an upper surface of the first area of the first insulating layer which is furthest from the substrate.

9. The display device of claim 1 , wherein the first insulating layer and the second insulating layer each comprise an organic material.

10. The display device of claim 1 , wherein the second insulating layer has a black color.

11. The display device of claim 1 , further comprising an encapsulation layer on the light-emitting element,
wherein the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer.

Assignees

• Samsung Display Co Ltd

Inventors

• JEON Bogeon
• Kim Jungi
• Jung Yangho
• Choi Seonhwa

Classifications

• H10K50/844

  Encapsulations · CPC title

• H10K59/126

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• H10K59/124 Primary

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K59/873

  Encapsulations · CPC title

• H01L51/56

  Electricity · mapped topic