BACKLIGHT UNIT AND DISPLAY DEVICE INCLUDING THE SAME

• US 20190187362A1
• Filed: 12/19/2018
• Published: 06/20/2019
• Est. Priority Date: 12/20/2017
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: LEE, JEE-NA, KIM, HYUN-HYANG, LEE, HYEONMI
• Granted Patent: US 10,732,346 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence
• CPC Class Codes: G02B 6/0093 Means for protecting the light guide
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

A display device includes a display panel and a backlight unit. The backlight unit includes a light source that includes a printed circuit board and a plurality of light emitting diode packages mounted on the printed circuit board, a light guiding member in contact with the light emitting diode packages, and a protection member. The protection member is disposed between and in contact with the light guiding member and the printed circuit board.

Claims

1. A display device, comprising:

a display panel; and

a backlight unit that emits light to the display panel,

wherein the backlight unit comprises;

a light source that includes a printed circuit board and a plurality of light emitting diode packages mounted on the printed circuit board;

a light guiding member in contact with the light emitting diode packages; and

a protection member disposed between and in contact with the light guiding member and the printed circuit board.

2. The display device of claim 1, wherein a thickness of each of the light emitting diode packages is substantially equal to that of the protection member.

3. The display device of claim 1, wherein the protection member includes a plurality of openings, and

each of the light emitting diode packages is inserted into a corresponding opening.

4. The display device of claim 3, wherein the protection member comprises:

a base that includes the openings; and

a lower support that extends from a first side portion of the base, wherein the lower support supports a bottom surface of the light guiding member.

5. The display device of claim 4, wherein the base and the lower support constitute a single object.

6. The display device of claim 4, wherein the protection member further comprises an upper support that extends from a second side portion of the base and contacts a top surface of the light guiding member.

7. The display device of claim 6, wherein the base, the lower support, and the upper support constitute a single object.

8. The display device of claim 1, further comprising a plurality of protection members,

wherein each of the plurality of protection members is disposed between a corresponding adjacent pair of the light emitting diode packages.

9. The display device of claim 8, wherein at least one of the plurality of protection members is mounted on the printed circuit board.

10. The display device of claim 8, wherein at least one of the plurality of protection members comprises:

a body portion that is in contact with the light guiding member; and

an adhesive member that attaches the body portion to the printed circuit board.

11. The display device of claim 8, wherein at least one of the plurality of protection members comprises:

a body portion that is in contact with the printed circuit board; and

an adhesive member that attaches the body portion to the light guiding member.

12. The display device of claim 8, wherein at least one of the plurality of protection members comprises:

a body portion;

a first adhesive member that attaches the body portion to the printed circuit board; and

a second adhesive member that attaches the body portion to the light guiding member.

13. The display device of claim 1, wherein a corner portion of the light guiding member has a chamfered shape.

14. The display device of claim 13, wherein the protection member has a shape corresponding to the chamfered shape.

15. A backlight unit, comprising:

a light source that includes a printed circuit board and a plurality of light emitting diode packages mounted on the printed circuit board;

a light guiding member in contact with the light emitting diode packages; and

a protection member disposed between and in contact with the light guiding member and the printed circuit board,

wherein a thickness of each of the light emitting diode packages is substantially equal to that of the protection member.

16. A backlight unit, comprising:

a light source that includes a printed circuit board and a plurality of light emitting diode packages mounted on the printed circuit board;

a light guiding member that includes a front surface and a rear surface that face each other and a plurality of side surfaces that connect the front surface to the rear surface, wherein at least one of the plurality of side surfaces is in contact with the plurality of light emitting diode packages; and

a protection member disposed between and in contact with the light guiding member and the printed circuit board.

17. The backlight unit of claim 16, wherein the light guiding member receives light emitted from the light emitting diode packages through the at least one side surface and emits the received light through the front surface.

18. The backlight unit of claim 17, wherein a length of one of the plurality of light emitting diode packages is substantially equal to that of the protection member.

19. The backlight unit of claim 18, wherein the protection member includes a plurality of openings, and

each of the light emitting diode packages is inserted into a corresponding opening.

20. The backlight unit of claim 18, further comprising a plurality of protection members, and

each of the plurality of protection members is disposed between a corresponding adjacent pair of the plurality of light emitting diode packages.