Planar lighting device

Patent metadata

Field	Value
Publication number	US-9482897-B2
Application number	US-201414161284-A
Country	US
Kind code	B2
Filing date	Jan 22, 2014
Priority date	Jan 23, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

Disclosed is a planar lighting device and more particularly, a planar lighting device including a light emitting device. The planar lighting device includes a plurality of light sources arranged on a first surface of a circuit substrate, the light sources mounted thereon, a light regulator disposed in an edge of the first surface, the light regulator regulating luminance difference caused by difference in distance between a plurality of light sources close to the edge, and an optical sheet disposed on the light sources.

First claim

What is claimed is:

1. A planar lighting device comprising:
a circuit substrate;
a plurality of light sources disposed on a first surface of the circuit substrate;
a reflection layer disposed on the first surface of the circuit substrate, the reflection layer comprising a plurality of openings corresponding to the respective light sources;
a light regulator disposed along an edge of the reflection layer; and
an optical sheet disposed on the light sources,
wherein the light regulator comprises absorber portions and reflector portions that are alternately located along the light regulator,
wherein the absorber portions are located in portions of the light regulator corresponding to positions of light sources closest to the light regulator, and the reflector portions are located in portions of the light regulator corresponding to positions between adjacent light sources closest to the light regulator, and
wherein a reflectance of the reflector portion is higher than a reflectance of the absorber portion.

2. The planar lighting device according to claim 1 , wherein the light regulator is formed by bending the reflection layer.

3. The planar lighting device according to claim 1 , wherein the absorber portions are discontinuously located in portions of the light regulator corresponding to positions of light sources closest to the light regulator.

4. The planar lighting device according to claim 1 , wherein the absorber portion includes an absorber for absorbing light emitted from the light source.

5. The planar lighting device according to claim 1 , wherein the absorber portion absorbs more light emitted from the light source than the reflector portion.

6. The planar lighting device according to claim 1 , wherein the absorber portion and the reflector portion have a same inclination.

7. The planar lighting device according to claim 1 , wherein the absorber portion has a same width in a height direction of the light regulator as the reflector portion,
wherein the absorber portion contacts neighboring reflector portions that are located in opposite sides of the absorber portion, and
wherein the neighboring reflector portion contacts a next absorber portion.

8. The planar lighting device according to claim 7 , wherein the absorber portion has a same width in a length direction of the light regulator as the reflector portion.

9. The planar lighting device according to claim 1 , wherein a reflectance per area of the reflector portion is higher than a reflectance per area of the absorber portion.

10. A display device comprising:
a circuit substrate;
a plurality of light sources disposed on the circuit substrate such that the light sources are spaced apart by a predetermined distance;
a reflection layer disposed on the circuit substrate, the reflection layer comprising:
a first surface having a plurality of openings corresponding to the respective light sources, and
a second surface connected to the first surface, wherein the second surface has an inclination with respect to the first surface; and

an optical sheet disposed on the light sources,
wherein the second surface includes first areas and second areas that are alternately located along the second surface,
wherein the second areas are located in portions of the second surface corresponding to positions of light sources closest to the second surface, and the first areas are located in portions of the second surface corresponding to positions between adjacent light sources closest to the second surface, and
wherein a reflectance of the first area is higher than a reflectance of the second area.

11. The device according to claim 10 , wherein the second area absorbs more light emitted from the light sources than the first area.

12. The device according to claim 10 , wherein the second areas are discontinuously located in portions of the second surface corresponding to positions of light sources closest to the second surface.

13. The device according to claim 10 , further comprising a lower cover,
wherein at least two circuit substrates are disposed on the lower cover.

14. The device according to claim 13 , wherein the at least two circuit substrates are disposed on the lower cover and spaced apart by a predetermined distance.

15. The device according to claim 10 , wherein a size of the openings of the reflection layer is greater than a size of the light sources.

16. The device according to claim 10 , wherein the second areas are spaced apart by a predetermined distance.

17. The device according to claim 10 , wherein the first area has a same width as the second area.

18. The device of claim 10 , wherein the second area includes an absorber for absorbing light emitted from the light source.

19. The device according to claim 10 , wherein the second area and the first area have a same inclination.

20. The device according to claim 10 , wherein the second area has a same width in a height direction of the second surface as the first area,
wherein the second area contacts neighboring first areas that are located in opposite sides of the second area, and
wherein the neighboring first area contacts a next second area.

21. The device according to claim 20 , wherein the second area has a same width in a length direction of the second surface as the first area.

22. The device according to claim 10 , wherein a reflectance per area of the first area is higher than a reflectance per area of the second area.

23. A display device comprising:
a circuit substrate;
a plurality of light sources disposed on a first surface of the circuit substrate;
a reflection layer disposed on the first surface of the circuit substrate, the reflection layer comprising a plurality of openings corresponding to the respective light sources;
a light regulator disposed along an edge of the reflection layer; and
an optical sheet disposed on the light sources,
wherein the light regulator includes first areas and second areas, and the second area is located between corresponding first areas,
wherein the second area corresponds to a position of the respective light source, and
wherein a reflectance of the first area is higher than a reflectance of the second area.

24. The device according to claim 23 , wherein the second area absorbs more light emitted from the light sources than the first area.

25. The device according to claim 23 , wherein the second areas are discontinuously located in portions of the light regulator corresponding to positions of light sources closest to the light regulator.

26. The device according to claim 23 , wherein a size of the openings of the reflection layer is greater than a size of the light sources.

27. The device according to claim 23 , wherein the second areas are spaced apart by a predetermined distance.

28. The device according to claim 23 , wherein the first area has a same width as the second area.

29. The device according to claim 23 , wherein the second area includes an absorber for absorbing light emitted from the light source.

30. The device according to claim 23 , wherein the second areas and the first areas are alternately located along the light regulator.

Assignees

• Lg Electronics Inc

Inventors

• Kim Yongjin
• Hong Munheon
• Park Chilkeun
• Kim Sangcheon
• Kim Mangeun

Classifications

• F21Y2105/00

  Planar light sources · CPC title

• F21V7/04

  Optical design · CPC title

• G02F1/1336

  Illuminating devices · CPC title

• F21V7/10

  Construction · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title