Organic light-emitting display panel, electronic device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10615375-B2
Application number	US-201715613044-A
Country	US
Kind code	B2
Filing date	Jun 2, 2017
Priority date	Nov 30, 2016
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

The invention discloses an organic light-emitting display panel, an electronic device and a method for manufacturing the same. The organic light-emitting display panel includes: pixel regions on a substrate which emit light of various colors; each pixel region includes a first electrode, a light-emitting functional layer and a second electrode, one of the first electrode and the second electrode is light exit side electrode(s); an optical coupling layer is set on one side of the light exit side electrode far from the light-emitting functional layer; the refractive index of the optical coupling layer in the blue light wavelength region is 2 to 2.3; the difference between the refractive index of the optical coupling layer in the blue light wavelength region and that in the green light wavelength region is less than or equal to 0.2.

First claim

What is claimed is:

1. An organic light-emitting display panel, comprising:
a substrate;
a plurality of pixel regions formed on the substrate, wherein the plurality of pixel regions each comprises:
a first electrode disposed on the substrate;
a light-emitting functional layer disposed on the first electrode and divided into red light emitting, green light emitting, and blue light emitting portions;
a second electrode disposed on the light-emitting functional layer, wherein the second electrode forms a light exit side electrode; and
an optical coupling layer disposed on one side of the second electrode facing away from the substrate, wherein the optical coupling layer is directly in contact with the second electrode and configured to have a same thickness over each of the red light emitting, green light emitting, and blue light emitting portions, and the optical coupling layer consists of one layer made of an inorganic material;
wherein a refractive index of the optical coupling layer in the blue light emitting portion is in a range of 2 to 2.3, and wherein a refractive index difference between the blue light emitting and green light emitting portions in the optical coupling layer is less than or equal to 0.2; and
wherein a refractive index difference between the green light emitting and red light emitting portions in the optical coupling layer is less than or equal to 0.1.

2. The organic light-emitting display panel as in claim 1 , wherein
an extinction coefficient of the optical coupling layer in the blue light emitting portion is less than or equal to 0.1, an extinction coefficient in the green light emitting portion is less than or equal to 0.01, and the extinction coefficient in the red light emitting portion is less than or equal to 0.01.

3. The organic light-emitting display panel as claimed in claim 1 , wherein
a total transmissivity of the light exit side electrode and the optical coupling layer in the all red, green and blue bands is greater than or equal to 60%.

4. The organic light-emitting display panel as in claim 1 , wherein
the optical coupling layer comprises MoOx.

5. The organic light-emitting display panel according to claim 1 , wherein
the thickness of the optical coupling layer is in a range of 20 nm to 140 nm.

6. The organic light-emitting display panel as n claim 1 , wherein
a micro-cavity structure is formed between the first electrode and the second electrode, wherein a cavity length of the micro-cavity structure corresponding to the pixel region is positively correlated to the wavelength of the emitted light in the pixel region, and wherein the cavity length of the micro-cavity structure is a distance between the first electrode and the second electrode.

7. The organic light-emitting display panel as in claim 1 , wherein
the light-emitting functional layer further comprises a first auxiliary functional layer, wherein the first auxiliary functional layer comprises at least one of a hole injection layer, a hole transport layer and an electron blocking layer.

8. The organic light-emitting display panel as claimed in claim 1 , wherein
the light-emitting functional layer further comprises a second auxiliary functional layer, wherein the second auxiliary functional layer comprises at least one of an electron transport layer, an electron injection layer, and a hole blocking layer.

9. The organic light-emitting display panel as claimed in claim 1 , wherein
the light-emitting functional layer comprises a light-emitting material layer, wherein the light-emitting material layer for the red light and the green light is composed of a phosphorescent material; and wherein the light-emitting material layer for the blue light is composed of a fluorescent material.

10. The organic light-emitting display panel as in claim 1 , wherein,
the light-emitting functional layer comprises a light-emitting material layer, wherein, the light-emitting material layer comprises a plurality of host materials, wherein the plurality of host materials is at least two for green light.

11. An electronic device, having an organic light-emitting display panel of claim 1 .

12. A method for manufacturing an organic light-emitting display panel, comprising:
providing a substrate;
forming a plurality of pixel units comprising:
forming a first electrode on the substrate;
forming a light-emitting functional layer on the first electrode, wherein the light-emitting functional layer is divided into red light emitting, green light emitting, and blue light emitting portions;
forming a second electrode on the light-emitting functional layer, wherein the second electrode is a light exit side electrode of the organic light-emitting display panel; and
forming an optical coupling layer on the second electrode, wherein the optical coupling layer is disposed in direct contact with one side of the second electrode facing away from the substrate;
wherein the optical coupling layer is configured to have a same thickness over each of the red light emitting, green light emitting, and blue light emitting portions;
wherein the optical coupling layer consists of one layer made of an inorganic material;
wherein a refractive index of the blue light emitting portion of the optical coupling layer is in a range of 2 to 2.3;
wherein a refractive index difference between the blue light emitting and green light emitting portions is less than or equal to 0.2 in the optical coupling layer; and
wherein a refractive index difference for the green light emitting and red light emitting portions is less than or equal to 0.1.

13. The method for manufacturing an organic light-emitting display panel as in claim 12 , wherein
the optical coupling layer is formed by techniques of evaporation, spin coating, inkjet printing or screen printing.

14. The method for manufacturing an organic light-emitting display panel as in claim 12 , wherein
the extinction coefficient for blue light is less than or equal to 0.1, for green and red light is less than or equal to 0.01.

15. An organic light-emitting display panel, comprising:
a substrate;
a plurality of pixel regions formed on the substrate, wherein the plurality of pixel regions each comprises:
a first electrode disposed on the substrate;
a light-emitting functional layer disposed on the first electrode and divided into red light emitting, green light emitting, and blue light emitting portions;
a second electrode disposed on the light-emitting functional layer, wherein the second electrode forms a light exit side electrode; and
an optical coupling layer disposed on one side of the second electrode, wherein the optical coupling layer has a multilayer stacked structure and is configured to have a same thickness over each of the red light emitting, green light emitting, and blue light emitting portions;
wherein a refractive index of the optical coupling layer in the blue light emitting portion region is in a range of 2 to 2.3, and wherein a refractive index difference between blue and green emitting portions in the optical coupling layer is less than or equal to 0.2; and
wherein a refractive index difference between the green and red light emitting portions in the optical coupling layer is less than or equal to 0.1.

Assignees

• Shanghai Tianma Am Oled Co Ltd
• Tianma Micro Electronics Co Ltd

Inventors

• Hua Wanming
• Wang Xiangcheng
• Ren Hongyang
• Hamada Yuji
• He Wei
• Niu Jinghua
• Liu Chen

Classifications

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• H01L27/3211

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L2251/303

  Electricity · mapped topic

• H01L51/5275 Primary

  Electricity · mapped topic