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

• US 8,267,543 B2
• Filed: 05/18/2006
• Issued: 09/18/2012
• 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
• Application Number:
  US11/720,239
• Publication Number:
  US 20080211989A1
• Time in Patent Office: 2,315 Days
• Field of Search: 362/230, 362/231, 362/235, 362/240, 362/241, 362612-613, 362/555, 362/97, 362/561, 362/27, 362/296, 362/297, 362/341, 362/346, 362/800, 36224901-24919, 362242-247, 362/607, 362/609, 362/623, 362632-634, 362 971- 973, 362/225, 36221703-21707, 362/217.11, 362/217.12, 36221714-21716, 362/296.07, 362/296.08, 362/311.08, 362/433, 362/455, 349/64
• 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 backlight assembly comprising:

a plurality of LED units, wherein each of the plurality of LED units has a plurality of LEDs, and each of the plurality of LEDs is covered with a first lens;

reflectors comprising a bottom reflector and a side reflector providing a plurality of recesses in which each of the plurality of LED units is correspondingly disposed; and

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

wherein the side reflector has a contact portion contacting directly with the diffusion sheet on a top surface of the side reflector, and the contact portion has a recess having a polygonal shaped cross-section, the recess of the contact portion providing a non-contacting portion and being separated from the plurality of recesses in which each of the plurality of LED units is correspondingly disposed.

2. The backlight assembly according to claim 1, wherein the bottom reflector is disposed under the plurality of LEDs.

3. The backlight assembly according to claim 1, wherein the bottom reflector and the side reflector are formed in one body.

4. The backlight assembly according to claim 1, wherein the plurality of LEDs is arranged in a square shape.

5. The backlight assembly according to claim 1, wherein the plurality of LEDs is arranged in a line shape.

6. A display device comprising:

a backlight assembly comprising;

a plurality of LED units, wherein each of the plurality of LED units has a plurality of LEDs, and each of the plurality of LEDs is covered with a first lens;

reflectors comprising a bottom reflector and a side reflector providing a plurality of recesses in which each of the plurality of LED units is correspondingly disposed; and

a diffusion sheet over the side reflector and covering the plurality of LED units; and

a panel receiving the light emitted from the backlight assembly,

wherein the side reflector has a contact portion contacting directly with the diffusion sheet on a top surface of the side reflector, and the contact portion has a recess having a polygonal shaped cross-section, the recess of the contact portion providing a non-contacting portion and being separated from the plurality of recesses in which each of the plurality of LED units is correspondingly disposed.

7. The display device according to claim 6, wherein the bottom reflector and the side reflector are formed in one body.

8. The display device according to claim 6, wherein the plurality of LEDs is arranged in a square shape.

9. The display device according to claim 6, wherein the plurality of LEDs is arranged in a line shape.