Light diffusion plate and display apparatus having the same

Patent metadata

Field	Value
Publication number	US-9939680-B2
Application number	US-201615171077-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Dec 7, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Provided is a display apparatus includes a display panel, a light source configured to emit light toward the display panel, a light diffusion plate disposed between the display panel and the light source such that light emitted from the light source is diffused and guided to the display panel, and at least one light diffusion layer provided on the light diffusion plate, having a light source corresponding portion corresponding to the light source, and including a plurality of light transmitting portions provided with a higher density at an edge portion of the light source corresponding portion than at a central portion of the light source corresponding portion.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel;
a plurality of light sources configured to emit light toward the display panel;
a light diffusion plate disposed between the display panel and the plurality of light sources such that light emitted from the plurality of light sources is diffused and guided to the display panel; and
at least one light diffusion layer provided on one surface of the light diffusion plate and having a light source corresponding portion corresponding to the plurality of light sources,
wherein the at least one light diffusion layer includes a plurality of light transmitting portions in the light source corresponding portion, and
wherein sizes of light transmitting portions among the plurality of light transmitting portions in a central portion of the light source corresponding portion are smaller than sizes of light transmitting portions among the plurality of light transmitting portions in an edge portion of the light source corresponding portion.

2. The display apparatus of claim 1 , wherein a density of the plurality of light transmitting portions is increased as a distance from the central portion of the light source corresponding portion increases.

3. The display apparatus of claim 1 , wherein the at least one light diffusion layer further includes a plurality of light reflecting portions that are formed between the plurality of light transmitting portions and are filled with white ink.

4. The display apparatus of claim 1 , wherein the at least one light diffusion layer is provided on an incident surface of the light diffusion plate onto which light emitted from the plurality of light sources is incident.

5. The display apparatus of claim 1 , wherein the plurality of light transmitting portions are provided with a higher density in the edge portion of the light source corresponding portion than in the central portion of the light source corresponding portion.

6. The display apparatus of claim 1 , wherein intervals between the light transmitting portions in the edge portion of the light source corresponding portion are smaller than intervals between the light transmitting portions in the central portion of the light source corresponding portion.

7. The display apparatus of claim 1 , wherein the light source corresponding portion comprises:
a plurality of first rows arranged in a first direction; and
a plurality of second rows arranged in a second direction and forming a plurality of intersections by crossing the plurality of first rows,
wherein the plurality of light transmitting portions are formed on the plurality of intersections.

8. The display apparatus of claim 7 , wherein sizes of the plurality of light transmitting portions formed along at least one of the plurality of first rows and the plurality of second rows are increased as a distance from the central portion of the light source corresponding portion increases.

9. The display apparatus of claim 7 , wherein at least one of an interval between the plurality of first rows and an interval between the plurality of second rows is decreased as a distance from the central portion of the light source corresponding portion increases.

10. The display apparatus of claim 1 , wherein the plurality of light transmitting portions include light transmitting portions formed around a circumference of the central portion of the light source corresponding portion, each light transmitting portion of the light transmitting portions formed around the circumference of the central portion of the light source corresponding portion being larger than an adjacent light transmitting portion disposed in a direction toward the central portion of the light source corresponding portion.

11. The display apparatus of claim 10 , wherein the light transmitting portions formed around the circumference of the central portion of the light source corresponding portion include a closed loop shape.

12. The display apparatus of claim 10 , wherein thicknesses of the light transmitting portions formed around the circumference of the central portion of the light source corresponding portion are increased as a distance from the central portion of the light source corresponding portion increases.

13. The display apparatus of claim 10 , wherein intervals between light transmitting portions adjacent to each other among the light transmitting portions formed around the circumference of the central portion of the light source corresponding portion are decreased as a distance from the central portion of the light source corresponding portion increases.

14. The display apparatus of claim 1 , wherein the at least one light diffusion layer comprises:
a first light diffusion layer provided on a first surface of the light diffusion plate onto which light emitted from the plurality of light sources is incident; and
a second light diffusion layer provided on a second surface of the light diffusion plate facing the display panel.

15. The display apparatus of claim 1 , wherein the at least one light diffusion layer is integrally formed with the light diffusion plate.

16. The display apparatus of claim 1 , wherein the at least one light diffusion layer is provided in the form of a film, and
the at least one light diffusion layer is attached to the light diffusion plate.

17. A light diffusion plate configured to diffuse light emitted from a plurality light sources, the light diffusion plate comprising:
a body; and
at least one light diffusion layer provided on the body, having a light source corresponding portion corresponding to the plurality of light sources, and formed with a pattern including a plurality of light transmitting portions and a plurality of light reflecting portions,
wherein a ratio of the plurality of light transmitting portions to the plurality of light reflecting portions at an edge portion of the light source corresponding portion is larger than a ratio of the plurality of light transmitting portions to the plurality of light reflecting portions at a central portion of the light source corresponding portion.

18. The light diffusion plate of claim 17 , wherein a ratio of the plurality of light transmitting portions to the plurality of light reflecting portions is increased as a distance from the central portion of the light source corresponding portion increases.

19. The light diffusion plate of claim 17 , wherein the plurality of light reflecting portions are filled with white ink.

20. The light diffusion plate of claim 17 , wherein the plurality of the light reflecting portions are more densely formed in the central portion of the light source corresponding portion than in the edge portion of the light source corresponding portion, and the plurality of the light transmitting portions are more densely formed in the edge portion of the light source corresponding portion than in the central portion of the light source corresponding portion.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Cho Byoung-Jin
• Lee Dae-Hee
• Park Yoon Ki
• Lee Ho Seok
• Jang Nae-Won
• Choi Han Mi

Classifications

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• G02B5/0278

  used in transmission · CPC title

• G02B5/0221

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title

• G02B5/021

  the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title