Flexible display panel, flexible display device and method of forming flexible display panel

Patent metadata

Field	Value
Publication number	US-12171109-B2
Application number	US-202117523517-A
Country	US
Kind code	B2
Filing date	Nov 10, 2021
Priority date	Nov 16, 2020
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

A flexible display panel, a flexible display device and a method of forming the flexible display panel are provided. The flexible display panel includes: a substrate; thin film transistors arranged in an array on the substrate; an electroluminescent device arranged on the thin film transistors and driven by the thin film transistors, including a pixel defining layer and an electroluminescent material defined by the pixel defining layer;
a thin film encapsulation layer on the electroluminescent device; a quantum dot photoconversion layer on the thin film encapsulation layer, including an isolation portion and a quantum dot luminescent material surrounded by the isolation portion, where an orthographic projection of the isolation portion onto the substrate covers an orthographic projection of the pixel defining layer onto the substrate; and a cover plate arranged on the quantum dot photoconversion layer.

First claim

What is claimed is:

1. A flexible display panel, comprising:
a substrate;
thin film transistors arranged in an array on the substrate;
an electroluminescent device arranged on the thin film transistors and driven by the thin film transistors, comprising a pixel defining layer and an electroluminescent material defined by the pixel defining layer;
a thin film encapsulation layer on the electroluminescent device;
a quantum dot photoconversion layer on the thin film encapsulation layer, comprising an isolation portion and a quantum dot luminescent material surrounded by the isolation portion, wherein an orthographic projection of the isolation portion onto the substrate covers an orthographic projection of the pixel defining layer onto the substrate; and
a cover plate arranged on the quantum dot photoconversion layer;
wherein the electroluminescent material is a blue light material, and the electroluminescent device is configured to emit blue light;
wherein the quantum dot luminescent material is a first material configured to emit white light after being excited by the blue light emitted by the electroluminescent device;
the flexible display panel further comprises a color film layer on the quantum dot photoconversion layer and comprising a black matrix and a filter film defined by the black matrix, wherein
an orthographic projection of the black matrix onto the substrate covers the orthographic projection of the isolation portion on the substrate;
an orthographic projection of the filter film onto the substrate covers an orthographic projection of the quantum dot luminescent material onto the substrate, wherein the filter film comprises a red filter film, a green filter film and a blue filter film corresponding to three sub-pixels of each pixel of the flexible display panel.

2. The flexible display panel according to claim 1 , wherein the first material comprises mixed red quantum dots and green quantum dots.

3. The flexible display panel according to claim 1 , wherein a cross section of the isolation portion in a direction perpendicular to the substrate is one of a trapezoid, a rectangle and a triangle.

4. A flexible display device, comprising a flexible display panel, wherein the flexible display panel comprises:
a substrate;
thin film transistors arranged in an array on the substrate;
an electroluminescent device arranged on the thin film transistors and driven by the thin film transistors, comprising a pixel defining layer and an electroluminescent material defined by the pixel defining layer;
a thin film encapsulation layer on the electroluminescent device;
a quantum dot photoconversion layer on the thin film encapsulation layer, comprising an isolation portion and a quantum dot luminescent material surrounded by the isolation portion, wherein an orthographic projection of the isolation portion onto the substrate covers an orthographic projection of the pixel defining layer onto the substrate; and
a cover plate arranged on the quantum dot photoconversion layer;
wherein the electroluminescent material is a blue light material, and the electroluminescent device is configured to emit blue light;
wherein the quantum dot luminescent material is a first material configured to emit white light after being excited by the blue light emitted by the electroluminescent device;
the flexible display panel further comprises a color film layer on the quantum dot photoconversion layer and comprising a black matrix and a filter film defined by the black matrix, wherein
an orthographic projection of the black matrix onto the substrate covers the orthographic projection of the isolation portion on the substrate;
an orthographic projection of the filter film onto the substrate covers an orthographic projection of the quantum dot luminescent material onto the substrate, wherein the filter film comprises a red filter film, a green filter film and a blue filter film corresponding to three sub-pixels of each pixel of the flexible display panel.

5. The flexible display device according to claim 4 , wherein the first material comprises mixed red quantum dots and green quantum dots.

6. The flexible display device according to claim 4 , wherein a cross section of the isolation portion in a direction perpendicular to the substrate is one of a trapezoid, a rectangle and a triangle.

7. A method of forming the flexible display panel according to claim 1 , comprising:
forming thin film transistors in an array on the substrate;
forming an electroluminescent device driven by the thin film transistor on the thin film transistor, wherein the electroluminescent device comprises a pixel defining layer and an electroluminescent material defined by the pixel defining layer;
forming a thin film encapsulation layer on the electroluminescent device;
forming a quantum dot photoconversion layer on the thin film encapsulation layer, wherein the quantum dot photoconversion layer comprises an isolation portion and a quantum dot luminescent material surrounded by the isolation portion, wherein an orthographic projection of the isolation portion onto the substrate covers an orthographic projection of the pixel defining layer onto the substrate; and
forming a cover plate on the quantum dot photoconversion layer;
wherein the electroluminescent material is a blue light material, the electroluminescent device is configured to emit blue light, and the quantum dot luminescent material is a first material, and the quantum dot luminescent material is configured to emit white light after being excited by the blue light emitted by the electroluminescent device, and the method further comprises:
forming a color film layer on the quantum dot photoconversion layer, wherein the color film layer comprises a black matrix and a filter film defined by the black matrix, wherein
an orthographic projection of the black matrix onto the substrate covers the orthographic projection of the isolation portion on the substrate;
an orthographic projection of the filter film onto the substrate covers an orthographic projection of the quantum dot luminescent material onto the substrate, wherein the filter film comprises a red filter film, a green filter film and a blue filter film corresponding to three sub-pixels of each pixel of the flexible display panel.

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Lee Myoungsoo
• Lee Jaeho
• Li Qianshu
• Sun Zhen
• Zeng Cheng

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K50/115 Primary

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K2102/311

  Flexible OLED · CPC title