Backlight unit assembly using light emitting diode array in liquid crystal display device

• US 20040246696A1
• Filed: 12/18/2003
• Published: 12/09/2004
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Yoo, In Yong
• Granted Patent: US 7,213,960 B2
• Time in Patent Office: Days
• US Class Current: 362/27
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A backlight unit assembly using a light emitting diode array in a liquid crystal display device is disclosed in the present invention. The backlight unit assembly includes a light emitting diode array having a plurality of red, green, and blue light emitting diodes emitting respective light, a first housing concentrating the light emitted from the light emitting diode array to a first direction, a sub-light guiding plate positioned at one side of the light emitting diode array mixing the light to form white light, a main-light guiding plate guiding the light incident on the sub-light guiding plate to a second direction, and a pair of holders at the left and right side portions of the light emitting diode array preventing the light from leaking to the outside of the backlight unit assembly.

Claims

1. A backlight unit assembly, comprising:

a light emitting diode array having a plurality of red, green, and blue light emitting diodes emitting respective light;

a first housing concentrating the light emitted from the light emitting diode array to a first direction;

a sub-light guiding plate positioned at one side of the light emitting diode array mixing the light to form white light;

a main-light guiding plate guiding the light incident on the sub-light guiding plate to a second direction; and

a pair of holders at the left and right side portions of the light emitting diode array preventing the light from leaking to the outside of the backlight unit assembly.

2. The backlight unit assembly of claim 1, wherein the main-light guiding plate is located on the sub-light guiding plate.

3. The backlight unit assembly of claim 2, further comprising:

a second housing concentrating the white light emitted from the sub-light guiding plate on the main-light guiding plate; and

a back cover between the sub-light guiding plate and the main-light guiding plate preventing the light from being transmitted therebetween.

4. The backlight unit assembly of claim 1, wherein the holders are formed of silicon rubber.

5. The backlight unit assembly of claim 1, wherein each holder has a side shape matching a shape of the first housing.

6. The backlight unit assembly of claim 5, wherein each holder is inserted into the first housing from a side portion of the light emitting diode array.

7. The backlight unit assembly of claim 1, wherein each holder has a reflecting plate.

8. The backlight unit assembly of claim 7, wherein the reflecting plate is formed of Miro.

9. The backlight unit assembly of claim 7, wherein the reflecting plate is coupled to lower surfaces of the sub-light guiding plate and the first housing to provide a light transmission passage.

10. The backlight unit assembly of claim 3, further comprising reflecting sheets on lower and upper surfaces of the back cover, and both sides of the sub-light guiding plate to provide a light transmission passage.

11. The backlight unit assembly of claim 7, wherein the reflecting plate is coupled to the second housing to provide a light transmission passage.

12. A backlight unit assembly, comprising:

a light emitting diode array having a plurality of light emitting diodes emitting red, green, and blue light;

a first housing coupled to the light emitting diode array and directing the emitted light to a first direction; and

a pair of holders holding the first housing and at both sides to prevent a light leakage from the backlight unit assembly.

13. The backlight unit assembly of claim 12, further comprising:

a first light guiding plate coupled to the light emitting diode array and mixing the emitted light from the light emitting diode array to form white light;

a second light guiding plate located on the first light guiding plate and directing the mixed light from the first light guiding plate to a second direction; and

a second housing concentrating the white light from the second light guiding plate.

14. The backlight unit assembly of claim 13, wherein the first light guiding plate is located on the second light guiding plate.

15. The backlight unit assembly of claim 13, wherein each holder has a reflecting plate.

16. The backlight unit assembly of claim 15, wherein the reflecting plate is formed of Miro.

17. The backlight unit assembly of claim 15, wherein the reflecting plate is coupled to lower surfaces of the second light guiding plate and the first housing to provide a light transmission passage.

18. The backlight unit assembly of claim 13, further comprising reflecting sheets at both sides of the second light guiding plate to provide a light transmission passage.

19. The backlight unit assembly of claim 15, wherein the reflecting plate is coupled to the second housing to provide a light transmission passage.