BACKLIGHT UNIT AND DISPLAY DEVICE USING THE SAME

• US 20110176087A1
• Filed: 01/07/2011
• Published: 07/21/2011
• Est. Priority Date: 01/15/2010
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: PARK, Dong Wook
• Granted Patent: US 8,477,262 B2
• Time in Patent Office: Days
• US Class Current: 349/63
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

Disclosed are a backlight unit and a display device using the same. The backlight unit includes a light guide plate, a light emitting module provided on at least one lateral surface of the light guide plate to supply light to the light guide plate, and a bottom cover to contain the light guide plate and the light emitting module. The light emitting module includes a substrate including a plurality of through holes and a plurality of light emitting devices which are inserted into the through holes and spaced apart from the light guide plate at a first distance.

Claims

1. A backlight unit comprising:

a light guide plate;

a light emitting module provided on at least one lateral surface of the light guide plate to supply light to the light guide plate; and

a bottom cover to contain the light guide plate and the light emitting module,

wherein the light emitting module includes a substrate including a plurality of through holes and a plurality of light emitting devices which are inserted into the through holes and spaced apart from the light guide plate at a first distance.

2. The backlight unit of claim 1, wherein the first distance is in a range of 0.05 mm to 0.5 mm.

3. The backlight unit of claim 1, wherein the substrate includes an insulating layer, the through holes formed in the insulating layer, and a circuit pattern formed on at least one surface of the insulating layer.

4. The backlight unit of claim 3, wherein a plurality of electrodes of the light emitting devices are electrically connected to the circuit pattern formed on a surface of the insulating layer which does not face the light guide plate.

6. The backlight unit of claim 1, wherein light exit surfaces of the light emitting devices are spaced apart from the light guide plate at the first distance.

7. The backlight unit of claim 1, wherein electrodes of the light emitting devices are electrically connected to a circuit pattern formed on a surface of an insulating layer which faces the light guide plate.

8. The backlight unit of claim 7, further comprising a bonding layer over a top surface of the electrodes, wherein the bonding layer makes contact with the light guide plate.

9. The backlight unit of claim 8, wherein the bonding layer includes solder or epoxy resin.

10. The backlight unit of claim 1, wherein each light emitting device includes a body, first and second electrodes installed in the body, a light emitting chip formed over at least one of the first and second electrodes and electrically connected to the and second electrodes, and an encapsulant to seal the light emitting chip, wherein a top surface of the encapsulant constitutes a light exit surface of the light emitting device.

11. The backlight unit of claim 10, wherein a light emitting chip includes at least one light emitting diode.

12. The backlight unit of claim 1, wherein the substrate includes one of a printed circuit board, a flexible printed circuit board, and a metal core printed circuit board.

13. The backlight unit of claim 1, wherein each light emitting device has a thickness smaller than a depth of the through hole.

14. The backlight unit of claim 1, wherein a part of each light emitting device protrudes out of a rear surface of the substrate.

16. A display device comprising:

a backlight unit of claims 1; and

a liquid crystal panel over the backlight unit.

17. The display device of claim 16, wherein the first distance is in a range of 0.05 mm to 0.5 mm.

5. The backlight unit of claim wherein the insulating layer of the substrate makes contact with the light guide plate.

15. A backlight unit comprising:

a light guide plate;

a light emitting module provided over at least one lateral surface of the light guide plate to supply light to the light guide plate; and

a bottom cover to contain the light guide plate and the light emitting module,

wherein the light emitting module includes a substrate including a plurality of insertion grooves and a plurality of light emitting devices which are inserted into the insertion grooves and spaced apart from the light guide plate at a first distance.