Display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11428989-B2
Application number	US-202017080627-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Aug 30, 2016
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A display device includes: a display substrate; a light amount control layer on the display substrate; a first polarizer on the light amount control layer; and a color conversion layer on the first polarizer. The color conversion layer includes a phosphor, the phosphor includes a quantum dot, the quantum dot including: a core; a first shell surrounding the core; and a second shell surrounding the first shell, and the quantum dot has a diameter ranging from about 2 nm to about 32 nm.

First claim

What is claimed is:

1. An organic light emitting diode display device comprising:
a base substrate;
an organic light emitting diode on the base substrate; and
a color conversion layer on the organic light emitting diode,
wherein the color conversion layer comprises a phosphor,
the phosphor comprises a quantum dot, the quantum dot comprising: a core; a first shell surrounding the core; and a second shell surrounding the first shell, wherein the first shell comprises at least one of: InP, CdSe, and ZnTe, and
the quantum dot has a diameter ranging from about 2 nm to about 32 nm.

2. The organic light emitting diode display device as claimed in claim 1 , wherein the quantum dot has a diameter ranging from about 9 nm to about 15 nm.

3. The organic light emitting diode display device as claimed in claim 1 , wherein the core has a diameter ranging from about 0.4 nm to about 7 nm.

4. The organic light emitting diode display device as claimed in claim 3 , wherein the core has a diameter ranging from about 2 nm to about 4 nm.

5. The organic light emitting diode display device as claimed in claim 1 , wherein the first shell has a thickness ranging from about 0.2 nm to about 2.5 nm.

6. The organic light emitting diode display device as claimed in claim 5 , wherein the first shell has a thickness ranging from about 0.3 nm to about 1.5 nm.

7. The organic light emitting diode display device as claimed in claim 1 , wherein the second shell has a thickness ranging from about 0.5 nm to about 10 nm.

8. The organic light emitting diode display device as claimed in claim 7 , wherein the second shell has a thickness ranging from about 3 nm to about 5 nm.

9. The organic light emitting diode display device as claimed in claim 1 , wherein the organic light emitting diode is configured to emit a blue light.

10. The organic light emitting diode display device as claimed in claim 1 , wherein the color conversion layer comprises:
a red color conversion portion configured to absorb a blue light to emit a red light; and
a green color conversion portion configured to absorb a blue light to emit a green light.

11. The organic light emitting diode display device as claimed in claim 10 , wherein the color conversion layer further comprises a transmissive portion configured to transmit a blue light.

Assignees

• Samsung Display Co Ltd
• Korea Inst Sci & Tech
• Korea Advanced Inst Sci & Tech
• Korea Insiitute Of Science And Tech

Inventors

• Nam Minki
• Park Kyoungwon
• Lee Baekhee
• Kim Youngmin
• Park Haeil
• KIM Jaikyeong
• Kim Heesuk
• Bae Wanki
• Lee Dohchang
• JEONG Byeongguk

Classifications

• G02F1/133617

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• Y02E10/549

  Organic PV cells · CPC title

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title

• Y10S977/952

  Display · CPC title

• G02F1/133602 Primary

  Direct backlight · CPC title