Light emitting cluster and direct light emitting type backlight unit having the same and liquid crystal display device having the backlight unit

• US 20060205242A1
• Filed: 03/14/2006
• Published: 09/14/2006
• Est. Priority Date: 03/14/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Su-gun, Noh, Ji-whan, Cho, Tae-hee, Wang, Jong-min
• Granted Patent: US 7,553,046 B2
• Time in Patent Office: Days
• US Class Current: 439/57
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members

Abstract

A light emitting cluster, a backlight unit having the same, and a liquid crystal display device having the backlight unit are provided. The light emitting cluster includes five light emitting devices including two first light emitting devices producing first color light, two second light emitting devices producing second color light, and a third light emitting device producing third color light, wherein one of the first light emitting devices, one of the second light emitting devices, the third light emitting device, one of the first light emitting devices, and one of the second light emitting devices are arranged sequentially.

Claims

1. A light emitting cluster comprising five light emitting devices including two first light emitting devices producing a first color light, two second light emitting devices producing a second color light, and a third light emitting device producing a third color light, wherein the five light emitting devices are arranged in a sequential order of a first one of the first light emitting devices, a first one of the second light emitting devices, the third light emitting device, a second one of the first light emitting devices, and a second one of the second light emitting devices.

2. The light emitting cluster of claim 1, wherein the first color light is green light and the second color light is red light, and the third color light is blue light.

3. The light emitting cluster of claim 1, wherein the first color light is red light and the second color light is green light, and the third color light is blue light.

4. The light emitting cluster of claim 1, wherein the first through third light emitting devices are light emitting diodes or organic light emitting diodes.

5. A backlight unit comprising a plurality of light emitting clusters arranged on a base plate to form a plurality of lines,

wherein each of the light emitting clusters comprises five light emitting devices including two first light emitting devices producing a first color light, two second light emitting devices producing a second color light, and a third light emitting device producing a third color light, wherein the five light emitting devices are arranged in a sequential order of a first one of the first light emitting devices, a first one of the second light emitting devices, the third light emitting device, a second one of the first light emitting devices, and a second one of the second light emitting devices.

6. The backlight unit of claim 5, wherein the first color light is green light, and the second color light is red light, and the third color light is blue light.

7. The backlight unit of claim 5, wherein the first color light is red light, and the second color light is green light, and the third color light is blue light.

8. The backlight unit of claim 5, wherein the first through third light emitting devices are light emitting diodes or organic light emitting diodes.

9. The backlight unit of claim 5, wherein in each of the lines, each of the first light emitting devices are separated from a subsequent first light emitting device by a predetermined distance and each of the second light emitting diodes are separated from a subsequent second light emitting diode by the predetermined distance.

10. The backlight unit of claim 5, further comprising a first transmission diffusion plate which diffuses and transmits incident light from the light emitting devices.

11. The backlight unit of claim 10, further comprising:

an optical plate; and

a reflection mirror pattern which is disposed on one surface of the optical plate and reflects light traveling directly from the light emitting devices.

12. The backlight unit of claim 10, further comprising at least one of a brightness enhancement film which enhances directivity of light emitted from the first transmission diffusion plate and a polarization enhancement film which enhances polarization efficiency.

13. A liquid crystal display device comprising:

a liquid crystal panel; and

a backlight unit which radiates light onto the liquid crystal panel,

wherein the backlight unit comprises a plurality of light emitting clusters arranged on a base plate to form a plurality of lines, and

wherein each of the light emitting clusters comprises five light emitting devices including two first light emitting devices producing a first color light, two second light emitting devices producing a second color light, and a third light emitting device producing a third color light, wherein the five light emitting devices are arranged in a sequential order of a first one of the first light emitting devices, a first one of the second light emitting devices, the third light emitting device, a second one of the first light emitting devices, and a second one of the second light emitting devices.

14. The liquid crystal display device of claim 13, wherein the first color light is green light, the second color light is red light, and the third color light is blue light.

15. The liquid crystal display device of claim 13, wherein the first color light is red light, the second color light is green light, and the third color light is blue light.

16. The liquid crystal display device of claim 13, wherein the first through third light emitting devices are light emitting diodes or organic light emitting diodes.

17. The liquid crystal display device of claim 13, wherein in each of the lines, each of the first light emitting devices are separated from a subsequent first light emitting device by a predetermined distance and each of the second light emitting diodes are separated from a subsequent second light emitting diode by the predetermined distance.

18. The liquid crystal display device of claim 13, further comprising a first transmission diffusion plate which diffuses and transmits incident light from the light emitting devices.

19. The liquid crystal display device of claim 18, wherein the backlight unit further comprises:

an optical plate; and

a reflection mirror pattern which is disposed on one surface of the optical plate and reflects light traveling directly from the light emitting devices.

20. The liquid crystal display device of claim 18, wherein the backlight unit further comprises at least one of a brightness enhancement film which enhances directivity of light emitted from the first transmission diffusion plate and a polarization enhancement film which enhances polarization efficiency.