Backlight assembly having LEDs and side reflectors and display apparatus having the same

• US 8,480,251 B2
• Filed: 08/15/2012
• Issued: 07/09/2013
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Jun Seok
• Primary Examiner(s): SEMBER, THOMAS M
• Application Number:
  US13/586,373
• Publication Number:
  US 20120307489A1
• Time in Patent Office: 328 Days
• Field of Search: 362/231, 362/235, 362/237, 362240-241, 362/247, 362/297, 362/308, 362 971- 974, 362/246, 362/245, 362/249.02
• US Class Current: 362/241
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21V 21/005 for several lighting devices in an end-to-end arrangement, i.e. light tracks
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 2201/34 reflector
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

A backlight assembly includes: a light emitting unit having a plurality of unit LEDs formed in a matrix, each of the unit LEDs having a red LED, a green LED, and a blue LED; a plurality of bottom reflectors disposed under the respective unit LEDs; and a plurality of side reflectors disposed around the respective unit LEDs.

Claims

1. A lighting unit comprising:

a plurality of LED units, wherein each of the plurality of LED units has a plurality of LEDs;

a reflector comprising a side portion providing a first recess and a bottom portion defining a second recess in which each of plurality of LED units is disposed; and

a diffusion sheet supported by the side portion of the reflector and covering the plurality of LED units,

wherein a top surface of the side portion has a contact portion contacting directly with the diffusion sheet,

wherein the first recess provides a non-contacting portion with the diffusion sheet and is separated from the second recess in which each of the plurality of LED units is disposed,

wherein the first recess is disposed under the diffusion sheet, and

wherein a bottom surface of the first recess is supported by the side portion of the reflector.

2. The lighting unit according to claim 1, wherein at least two LEDs of the plurality of LEDs have wavelength different from each other.

3. The lighting unit according to claim 1, wherein the reflector is formed of circular shape.

4. The lighting unit according to claim 1, wherein the first recess has a polygonal shaped cross section.

5. The lighting unit according to claim 1, wherein the first recess is disposed within the top surface of the side portion.

6. The lighting unit according to claim 1, wherein the plurality of LEDs is arranged in a square shape.

7. The lighting unit according to claim 1, wherein the plurality of LEDs is arranged in a line shape.

8. The lighting unit according to claim 1, wherein the plurality of LEDs includes at least two LEDs selected from the group consisting of a plurality of red LEDs, a plurality of green LEDs, and a plurality of blue LEDs.

9. A lighting unit comprising:

a plurality of LED units;

a diffusion sheet covering the plurality of LED units; and

a side reflector comprising a top surface supporting the diffusion sheet, a bottom surface surrounding each of the plurality of LED units, and a side portion between the top surface and the bottom surface,

wherein the top surface includes a contact portion contacting directly with the diffusion sheet and a first recess providing a non-contacting portion with the diffusion sheet,

wherein the first recess is disposed under the diffusion sheet, and

wherein a bottom surface of the first recess is supported by the side portion of the reflector.

10. The lighting unit according to claim 9, wherein the bottom surface of the side reflector defines a second recess in which each of the plurality of LED units is disposed.

11. The lighting unit according to claim 10, wherein the first recess is separated from the second recess.

12. The lighting unit according to claim 9, wherein each of the plurality of LED units has a plurality of LEDs.

13. The lighting unit according to claim 12, wherein at least two LEDs of the plurality of LEDs have wavelength different from each other.

14. The lighting unit according to claim 12, wherein the plurality of LEDs is arranged in a square shape.

15. The lighting unit according to claim 12, wherein the plurality of LEDs is arranged in a line shape.

16. The lighting unit according to claim 12, wherein the plurality of LEDs includes at least two LEDs selected from the group consisting of a plurality of red LEDs, a plurality of green LEDs, and a plurality of blue LEDs.

17. The lighting unit according to claim 9, wherein the side reflector is formed of circular shape.

18. A lighting unit comprising:

a plurality of LED units, wherein each of the plurality of LED units has a plurality of LEDs;

a diffusion sheet disposed on the plurality of LED units;

a reflector comprising a contact portion contacting directly with the diffusion sheet, a first recess providing a non-contacting portion with the diffusion sheet, a bottom portion defining a second recess in which each of the plurality of LED units is disposed, and a side portion between the contact portion and the bottom portion,

wherein the first recess is disposed under the diffusion sheet, and

wherein a bottom surface of the first recess is supported by the side portion of the reflector.

19. The lighting unit according to claim 18, wherein at least two LEDs of the plurality of LEDs have wavelength different from each other.

20. The lighting unit according to claim 18, wherein the reflector is formed of circular shape.