Backlight assembly and display device including the same

Patent metadata

Field	Value
Publication number	US-9658475-B2
Application number	US-201414320746-A
Country	US
Kind code	B2
Filing date	Jul 1, 2014
Priority date	Feb 5, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A backlight assembly includes a light source portion including a plurality of light sources. The light sources are configured to emit light. A wavelength conversion member is disposed on the light source portion. The wavelength conversion member is configured to convert a wavelength of light emitted from the light source portion. The wavelength conversion member includes a first substrate disposed on the light source portion, a second substrate disposed on the first substrate, and a plurality of wavelength conversion layers interposed between the first substrate and the second substrate. Each of the plurality of wavelength conversion layers correspond to a light source of the plurality of light sources.

First claim

What is claimed is:

1. A backlight assembly, comprising:
a light source portion including a plurality of light sources, wherein the light source portion is configured to emit light; and
a wavelength conversion member disposed on the light source portion, wherein the wavelength conversion member is configured to convert a wavelength of light emitted from the light source portion,
wherein the wavelength conversion member includes:
a first substrate disposed on the light source portion;
a second substrate disposed on the first substrate; and
a plurality of wavelength conversion layers, wherein each of the wavelength conversion layers is disposed between an upper surface of the first substrate and a lower surface of the second substrate, wherein the upper surface of the first substrate forms a plurality of recesses, wherein at least part of each of the wavelength conversion layers is positioned in the recesses, and
wherein each of the plurality of wavelength conversion layers one-to-one correspond to a light source of the plurality of light sources, wherein first and second side surfaces and a bottom surface of each of the plurality of wavelength conversion layers is covered by the first substrate, and wherein the first substrate separates each of the plurality of wavelength conversion layers from each other.

2. The backlight assembly of claim 1 , wherein the plurality of wavelength conversion layers comprise quantum dots.

3. The backlight assembly of claim 1 , wherein at least one of the first substrate and the second substrate comprises a plurality of recess patterns, wherein each of the plurality of recess patterns is disposed on a corresponding light source of the plurality of light sources, and
the plurality of wavelength conversion layers is disposed in the plurality of recess patterns.

4. The backlight assembly of claim 1 , wherein a plane that connects centers of each of the plurality of light sources to each other is parallel to a plane that connects centers of each of the plurality of wavelength conversion layers to each other.

5. The backlight assembly of claim 1 , further comprising a plurality of supports disposed between the plurality of wavelength conversion layers and the light source portion.

6. The backlight assembly of claim 1 , wherein the wavelength conversion member further comprises a plurality of optical patterns disposed on at least one of the first substrate and the second substrate.

7. The backlight assembly of claim 6 , wherein the plurality of optical patterns is disposed on the plurality of wavelength conversion layers, but not on an area surrounding the plurality of wavelength conversion layers.

8. The backlight assembly of claim 1 , wherein at least one of the first substrate and the second substrate comprises a plurality of diffusion beads disposed therein.

9. The backlight assembly of claim 1 , wherein a thickness of each of the plurality of wavelength conversion layers is greater toward a center part of the plurality of light sources.

10. The backlight assembly of claim 1 , wherein each of the plurality of wavelength conversion layers is disposed on center parts of the corresponding light sources of the plurality of light sources, and is not disposed on outermost parts of the light sources of the plurality of light sources.

11. The backlight assembly of claim 1 , wherein each of the plurality of wavelength conversion layers comprises a plurality of sub-wavelength conversion layers that are spaced apart from each other.

12. A display device, comprising:
a display panel configured to display an image; and
a backlight assembly configured to provide light to the display panel,
wherein the backlight assembly includes:
a light source portion including a plurality of light sources configured to emit light that is provided to the display panel; and
a wavelength conversion member disposed on the light source portion, wherein the wavelength conversion member is configured to convert a wavelength of light emitted from the light source portion,
wherein the wavelength conversion member includes:
a first substrate disposed on the light source portion;
a second substrate disposed on the first substrate; and
a plurality of wavelength conversion layers, wherein each of the wavelength conversion layers is disposed between an upper surface of the first substrate and a lower surface of the second substrate, wherein the upper surface of the first substrate forms a plurality of recesses, wherein at least part of each of the wavelength conversion layers is positioned in the recesses, and
wherein each of the plurality of wavelength conversion layers one-to-one corresponds to the plurality of light sources, and wherein each of the recesses has a thickness of from ¼ to ¾ of a thickness of the first substrate.

13. The display device of claim 12 , wherein each of the plurality of wavelength conversion layers comprise quantum dots.

14. The display device of claim 12 , wherein at least one of the first substrate and the second substrate comprises a plurality of recess patterns, wherein the plurality of recess patterns is disposed on the plurality of light sources, and
the plurality of wavelength conversion layers is disposed in the plurality of recess patterns.

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Kim Dong Hoon
• Lee Dong Hyeon
• Baek Seung Hwan
• Yoon Ju Young
• Cha Han Moe
• Choi Young Jun

Classifications

• G02F2202/10

  semiconductor · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• G02F1/133602 Primary

  Direct backlight · CPC title

• Y10S977/95

  Electromagnetic energy · CPC title

• G02F1/0105 Primary

  Illuminating devices · CPC title