Organic light-emitting diode display device and its manufacturing method

Patent metadata

Field	Value
Publication number	US-9905808-B2
Application number	US-201515107051-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Apr 14, 2015
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

The present disclosure provides an OLED display device and its manufacturing method. The OLED display device includes an organic light-emitting layer and a plurality of elements arranged one on another at a light-exiting side of the organic light-emitting layer. At least one transparent light extraction layer is arranged between the elements, and/or between the organic light-emitting layer and the element adjacent to the organic light-emitting layer, and/or at a light-exiting surface of the element farthest away from the organic light-emitting layer. A refractive index of the organic light-emitting layer and/or a refractive index of the element adjacent to the light extraction layer, and a refractive index of the light extraction layer decrease successively in a light emergent direction, and the refractive index of the light extraction layer is greater than a refractive index of air.

First claim

What is claimed is:

1. An organic light-emitting diode (OLED) display device, comprising an organic light-emitting layer and a plurality of elements arranged one on another at a light-exiting side of the organic light-emitting layer,
wherein at least one transparent light extraction layer is arranged at at least one of following positions: a position between the elements, a position between the organic light-emitting layer and one of the elements adjacent to the organic light-emitting layer, and a position at a light-exiting surface of one of the elements farthest away from the organic light-emitting layer;
at least one of a refractive index of the organic light-emitting layer and a refractive index of one of the elements adjacent to the transparent light extraction layer, and a refractive index of the transparent light extraction layer decrease successively in a light emergent direction, and the refractive index of the transparent light extraction layer is greater than a refractive index of air, and
the at least one transparent light extraction layer comprises a plurality of transparent light extraction layers, at least one of a light-exiting surface and a light-entering surface of each of the transparent light extraction layers is a rough surface, or the transparent light extraction layers are arranged one on another and at least one of the light-exiting surfaces and the light-entering surfaces of the transparent light extraction layers is a rough surface.

2. The OLED display device according to claim 1 , wherein the rough surface is a corrugated surface.

3. The OLED display device according to claim 1 , wherein the transparent light extraction layer is made of a photocuring or thermosetting material.

4. The OLED display device according to claim 3 , wherein the photocuring material is photocuring resin, and the thermosetting material is thermosetting resin.

5. The OLED display device according to claim 3 , wherein the photocuring material comprises polymer-dispersed liquid crystals.

6. The OLED display device according to claim 1 , wherein the OLED display device is a top-emission display device, and the elements comprise, in the light emergent direction, an electron transport layer, an electron injection layer, a cathode layer and a first substrate;
wherein the at least one transparent light extraction layer is arranged at at least one of following positions: a position between the electron transport layer and the electron injection layer, a position between the electron injection layer and the cathode layer, a position between the cathode layer and the first substrate, a position between the organic light-emitting layer and the electron transport layer, and a position at a light-exiting surface of the first substrate.

7. The OLED display device according to claim 1 , wherein the OLED display device is a bottom-emission display device, and the elements comprise, in the light emergent direction, a hole transport layer, a hole injection layer, an anode layer and a second substrate;
wherein the at least one transparent light extraction layer is arranged at at least one of following positions: a position between the hole transport layer and the hole injection layer, a position between the hole injection layer and the anode layer, a position between the anode layer and the second substrate, a position between the organic light-emitting layer and the hole transport layer, and a position at a light-exiting surface of the second substrate.

8. A method for manufacturing an organic light-emitting diode (OLED) display device, comprising steps of:
forming an organic light-emitting layer;
forming a plurality of elements one on another at a light-exiting side of the organic light-emitting layer; and
forming at least one transparent light extraction layer at at least one of following positions: a position between the elements, a position between the organic light-emitting layer and one of the elements adjacent to the organic light-emitting layer, and a position at a light-exiting surface of one of the elements farthest away from the organic light-emitting layer,
wherein at least one of a refractive index of the organic light-emitting layer and a refractive index of one of the elements adjacent to the transparent light extraction layer, and a refractive index of the transparent light extraction layer decrease successively in a light emergent direction, and the refractive index of the transparent light extraction layer is greater than a refractive index of air,
wherein the step of forming the at least one transparent light extraction layer comprises steps of:
forming the transparent light extraction layer with at least one of a light-exiting surface and a light-entering surface of the transparent light extraction layer being a rough surface through a patterning process, and repeating this step for N−1 times so as to form N transparent light extraction layers, wherein N is a positive integer greater than or equal to 1; or
forming N transparent light extraction layers with at least one of the light-exiting surfaces and the light-entering surfaces of one or more of the N transparent light extraction layers being a rough surface through a patterning process, wherein N is a positive integer greater than 1.

9. The method according to claim 8 , wherein the step of forming the transparent light extraction layer with at least one of a light-exiting surface and a light-entering surface of the transparent light extraction layer being a rough surface through a patterning process comprises steps of:
performing coating of a transparent thermosetting material layer, curing the transparent thermosetting material layer into the transparent light extraction layer, and causing at least one of the light-exiting surface and the light-entering surface of the transparent light extraction layer to be the rough surface by an imprinting process; or
performing coating of a transparent photocuring material layer, curing the transparent photocuring material layer into the transparent light extraction layer, and causing at least one of the light-exiting surface and the light-entering surface of the transparent light extraction layer to be the rough surface through exposing and developing processes.

10. The method according to claim 8 , wherein the step of forming N transparent light extraction layers with at least one of the light-exiting surfaces and the light-entering surfaces of one or more of the N transparent light extraction layers being a rough surface through a patterning process comprises steps of:
performing coating of a transparent thermosetting material layer, curing the transparent thermosetting material layer into the transparent light extraction layer, and repeating the above coating and curing steps for N−1 times to form the N transparent light extraction layers, wherein during a process of forming the N transparent light extraction layers, at least one of the light-exiting surfaces and the light-entering surfaces of one or more of the N transparent light extraction layers is caused to be the rough surface by an imprinting process; or
performing coating of a transparent photocuring material layer, curing the transparent photocuring material layer into the transparent light extraction layer, and repeating the above coating and curing steps for N−1 times to form the N transparent light extraction layers, wherein during a process of forming the N transparent light extraction layers, at least one of the light-exiting surfaces and the light-entering surfaces of one or more of the N transparent light extraction layers is caused to be the rough surface through exposing and developing processes.

11. The method according to cla

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Yang Jiuxia
• Bai Feng

Classifications

• H01L51/5275 Primary

  Electricity · mapped topic

• H01L2251/5315

  Electricity · mapped topic

• H01L2251/105

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H10K59/877

  comprising scattering means · CPC title