Light conversion member and display apparatus including the same

• US 10,078,170 B2
• Filed: 02/29/2016
• Issued: 09/18/2018
• Est. Priority Date: 06/16/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Donghoon, Shin, Myeong-ju, You, Junwoo, Chung, Seunghwan
• Primary Examiner(s): Dzierzynski, Evan
• Application Number:
  US15/056,249
• Publication Number:
  US 20160370526A1
• Time in Patent Office: 932 Days
• CPC Class Codes: G02B 5/23 Photochromic filters
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer

Abstract

A light conversion member includes a base substrate, a first light conversion layer disposed on the base substrate and including a plurality of first quantum dots that converts first light into light with a first color, a second light conversion layer disposed between the base substrate and the first light conversion layer and including a plurality of second quantum dots that converts the first light into light with a second color. Each of the first quantum dots includes a first core that converts the first light into light with the first color; a first shell surrounding the first core and including an organic material; and a second shell surrounding the first shell and including an inorganic material.

Claims

1. A light conversion member, comprising:

a base substrate;

a first light conversion layer disposed on the base substrate, wherein the first light conversion layer comprises a plurality of first quantum dots which converts first light into light with a first color; and

a second light conversion layer disposed between the base substrate and the first light conversion layer, wherein the second light conversion layer comprises a plurality of second quantum dots which converts the first light into light with a second color,

wherein each of the first quantum dots comprises;

a first core which converts the first light into light with the first color;

a first shell which surrounds the first core and comprises an organic material; and

a second shell which surrounds the first shell and comprises an inorganic material, and

a barrier layer is not provided over the first light conversion layer.

2. The light conversion member of claim 1, wherein each of the second quantum dots comprises:

a second core which converts the first light into light with a second color; and

a first shell which surrounds the second core and comprises an organic material.

3. The light conversion member of claim 2, wherein a size of the first core is greater than a size of the second core.

4. The light conversion member of claim 2, wherein

the first color is red,

the second color is green, and

the first light is blue light.

5. The light conversion member of claim 2, further comprising:

a first diffusion layer disposed under the base substrate;

a second diffusion layer disposed over the first light conversion layer; and

a barrier layer disposed between the base substrate and the second light conversion layer,

wherein the barrier layer comprises an inorganic material.

6. The light conversion member of claim 1, wherein the second shell comprises a silicon oxide.

7. The light conversion member of claim 1, wherein each of the first and second light conversion layers further comprises a resin which accommodates the first or second quantum dots.

8. The light conversion member of claim 1, wherein each of the second quantum dots comprises:

a second core which converts the first light into light with a second color;

a first shell which surrounds the second core and comprises an organic material; and

a second shell which surrounds the first shell and comprises an inorganic material.

9. A light conversion member comprising:

a first diffusion layer;

a base substrate disposed on the first diffusion layer;

a barrier layer disposed on the base substrate;

a first light conversion layer disposed on the barrier layer, wherein the first light conversion layer comprises a plurality of first bulk units which converts first light into light with a first color; and

a second light conversion layer disposed between the base substrate and the first light conversion layer, wherein the second light conversion layer comprises a plurality of second quantum dots which converts the first light into light with second color,

wherein each of the first bulk units comprises;

a plurality of first quantum dots, wherein each of the first quantum dots comprises a first core which converts the first light into light with the first color, and a first shell which surrounds the first core and comprises an organic material;

a second shell which accommodates the first quantum dots and comprises an inorganic material, and

a barrier layer is not provided over the first light conversion layer.

10. The light conversion member of claim 9, wherein

each of the first and second light conversion layers further comprises a resin which accommodates the first bulk units and the second quantum dots, and

the first bulk units define a plurality of layers stacked one on another on the second light conversion layer.

11. The light conversion member of claim 9, wherein each of the second quantum dots comprises:

a second core which converts the first light into light with the second color; and

a first shell which surrounds the second core and including an organic material,

wherein

a size of the first core is greater than a size of the second core,

the first color is red,

the second color is green, and

the first light is blue light.

12. The light conversion member of claim 9, further comprising:

a second diffusion layer disposed on the first light conversion layer.

13. The light conversion member of claim 9, wherein

the first light conversion layer further comprises a plurality of protruding patterns comprising the resin and having a shape of a peak, and

each of the protruding patterns accommodates a portion of the first bulk units.

14. A light conversion member, comprising:

a base substrate;

a first light conversion layer disposed on the base substrate, wherein the first light conversion layer comprises a plurality of first bulk units which converts first light into light with a first color;

a second light conversion layer disposed under the base substrate, wherein the second light conversion layer comprises a plurality of second bulk units which converts the first light into light with second color; and

a first diffusion layer disposed under the second light conversion layer,

wherein each of the first bulk units comprises;

a plurality of first quantum dots, wherein each of the first quantum dots comprises a first core which convert the first light into light with the first color, and a first shell which surround the first core; and

a second shell which accommodates the first quantum dots, and

wherein each of the second bulk units comprises;

a plurality of second quantum dots, wherein each of the second quantum dots comprises a second core which convert the first light into light with the second color, and a first shell which surround the second core; and

a second shell which accommodates the second quantum dots,

wherein each of the first shells of the first and second bulk units comprises an organic material,

wherein each of the second shells of the first and second bulk units comprises an inorganic material, and

barrier layers are not provided under the second light conversion layer and over the first light conversion layer.

15. The light conversion member of claim 14, wherein

each of the first and second light conversion layers further comprises a resin which accommodates the first bulk units and the second bulk units,

the first bulk units define a plurality of layers stacked one on another on the base substrate, and

the second bulk units define a plurality of layers stacked one on another under the base substrate.

16. The light conversion member of claim 14, further comprising:

a second diffusion layer disposed on the first light conversion layer.

17. The light conversion member of claim 14, wherein

the first light conversion layer further comprises a plurality of protruding patterns comprising the resin and having a shape of a peak, and

each of the protruding patterns accommodates a portion of the first bulk units.

18. A display apparatus, comprising:

a light source which generates first light;

a light guide plate which upwardly guides the first light;

a light conversion member disposed on the light guide plate and which converts the first light into a second light; and

a display panel which displays an image using the second light received from the light conversion member,

wherein the light conversion member comprises;

a base substrate;

a first light conversion layer disposed on the base substrate, wherein the first light conversion layer comprises a plurality of first quantum dots which convert the first light into light with a first color; and

a second light conversion layer disposed between the base substrate and the first light conversion layer, wherein the second light conversion layer comprises a plurality of second quantum dots which convert the first light into light with a second color,

wherein each of the first quantum dots comprises;

a first core which converts the first light into light with the first color;

a first shell which surrounds the first core and comprises an organic material; and

a second shell which surrounds the first shell and comprises an inorganic material, and

wherein each of the second quantum dots comprises;

a second core which converts the first light into light with the second color; and

a first shell which surrounds the second core and comprises an organic material, and

a barrier layer is not provided over the first light conversion layer.

19. The display apparatus of claim 18, further comprising:

a first diffusion layer disposed under the base substrate;

a second diffusion layer disposed over the first light conversion layer; and

a barrier layer disposed between the base substrate and the second light conversion layer,

wherein the barrier layer comprises an inorganic material.