Illumination unit and display apparatus using the same

• US 9,347,645 B2
• Filed: 12/01/2014
• Issued: 05/24/2016
• Est. Priority Date: 12/12/2011
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kim, Moon Jeong
• Primary Examiner(s): Patel, Vip
• Application Number:
  US14/557,219
• Publication Number:
  US 20150085484A1
• Time in Patent Office: 540 Days
• Field of Search: 362/235, 362/241, 362/243, 362/247, 362/297
• US Class Current: 1/1
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: G02B 6/0096 the lights guides being of the hollow type
• CPC Class Codes: G09F 13/0422 Reflectors
• CPC Class Codes: G09F 13/0436 Signs, boards or panels attached to ceilings
• CPC Class Codes: G09F 13/049 Edge illuminated signs, boards or panels
• CPC Class Codes: G09F 13/14 Arrangements of reflectors therein
• CPC Class Codes: G09F 13/18 Edge-illuminated signs
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/142 multiple reflectors
• CPC Class Codes: G09F 2013/145 curved reflectors
• CPC Class Codes: G09F 2013/147 plane reflectors
• CPC Class Codes: G09F 2013/1881 Frame-like
• CPC Class Codes: G09F 2013/222 with LEDs

Abstract

An illumination unit, can include first and second reflectors, and at least one light source module disposed between the first and second reflectors, wherein the second reflector includes at least one inclined surface including at least one inflection point, and at least one first flat surface disposed close to the at least one light source module and being parallel to the first reflector.

Claims

1. An illumination unit, comprising:

first and second reflectors; and

at least one light source module disposed between the first and second reflectors,

wherein the second reflector includes;

at least one inclined surface including at least one inflection point; and

at least one first flat surface parallel to the first reflector,

wherein the at least one light source module is closer to the at least one first flat surface than the at least one inclined surface.

2. The illumination unit according to claim 1, wherein the at least one inclined surface includes a plurality of inclined surfaces disposed next to each other about the at least one inflection point.

3. The illumination unit according to claim 2, wherein the inclined surfaces have different radii of curvature.

4. The illumination unit according to claim 2, wherein the second reflector comprises:

a first region aligned with the at least one light source module and being the at least one first flat surface;

a second region being a first inclined surface which is inclined downward from the first region; and

a third region being a second inclined surface which is inclined upward from the second region, the inclined surfaces including the first and second inclined surface.

5. The illumination unit according to claim 4, wherein the first and second inclined surfaces are disposed next to each other about the at least one inflection point.

6. The illumination unit according to claim 4, wherein the second region is disposed between the first region and the third region, and

wherein the third region is disposed next to the second region.

7. The illumination unit according to claim 4, wherein the first inclined surface is a curved surface having a first radius of curvature, and

wherein the second inclined surface is a curved surface having a second radius of curvature.

8. The illumination unit according to claim 7, wherein the first radius of curvature is greater than the second radius of curvature.

9. The illumination unit according to claim 7, wherein the first radius of curvature and the second radius of curvature are equal to each other.

10. The illumination unit according to claim 4, wherein at least one of the first inclined surface or the second inclined surface is a convexly curved surface.

11. The illumination unit according to claim 4, wherein at least one of the first inclined surface or the second inclined surface is a concavely curved surface.

12. The illumination unit according to claim 4, wherein the first inclined surface is a second flat surface having a first gradient and the second inclined surface is a third flat surface having a second gradient.

13. The illumination unit according to claim 12, wherein the first gradient is greater than the second gradient.

14. The illumination unit according to claim 4, wherein the first region is provided with a specular-reflection sheet, and

wherein the second region and third region are provided with at least one of a specular-reflection sheet or a diffuse-reflection sheet.

15. The illumination unit according to claim 4, wherein the first, second, and third regions have different surface roughness values.

16. The illumination unit according to claim 4, wherein the at least one light source module is spaced apart from the first reflector by a first distance,

wherein the at least one light source module is spaced apart from the first region of the second reflector by a second distance, and

wherein the first distance is less than the second distance.

17. The illumination unit according to claim 4, wherein the at least one light source module contacts with both the first reflector and the first region of the second reflector.

18. The illumination unit according to claim 4, wherein the first region overlaps with the first reflector, and

wherein a width of the first region is less than a width of the first reflector.

19. The illumination unit according to claim 4, wherein the second reflector further comprises a fourth region disposed next to the third region and located at a center of the second reflector.

20. The illumination unit according to claim 19, wherein the fourth region has a gentle shape without a pointed portion.