Display device having a phosphor including a quantum dot and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10852587-B2
Application number	US-201715690050-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Aug 30, 2016
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

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. A display device comprising:
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,
wherein the color conversion layer comprises a resin comprising a phosphor and a reflective element,
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, ZnSe, and ZnTe, and
the quantum dot has a diameter ranging from about 2 nm to about 32 nm,
wherein the first shell has a thickness ranging from about 0.2 nm to about 2.5 nm, and
wherein the second shell has a thickness ranging from about 3 nm to about 5 nm.

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

5. The display device as claimed in claim 1 , wherein the first shell has a thickness ranging from about 0.3 nm to about 1.5 nm.

6. The display device as claimed in claim 5 , wherein the color conversion layer further comprises a transmissive portion configured to transmit a blue light.

7. The 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.

8. The display device as claimed in claim 1 , further comprising a second polarizer on the display substrate.

9. The display device as claimed in claim 1 , wherein the light amount control layer comprises a liquid crystal layer.

10. The display device as claimed in claim 1 , wherein the core comprises at least one of: ZnTe, CdS, and GaP.

11. The display device as claimed in claim 1 , wherein the second shell comprises at least one of: ZnS, CdS, GaP, and ZnTe.

12. The display device as claimed in claim 1 , wherein the reflective element comprises TiO2.

13. The display device as claimed in claim 1 , wherein the reflective element has a particle shape and is dispersed in the resin.

Assignees

• Samsung Display Co Ltd
• Korea Inst Sci & Tech
• Korea Advanced Inst Sci & Tech

Inventors

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

Classifications

• H10K85/321

  Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] · CPC title

• H10K50/868

  Arrangements for polarized light emission (H10K50/86 takes precedence) · CPC title

• H10K59/50

  OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements · CPC title

• H10K59/38 Primary

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

• H10K85/381

  Metal complexes comprising a group IIB metal element, e.g. comprising cadmium, mercury or zinc · CPC title