Backlight unit and liquid crystal display including the same

Patent metadata

Field	Value
Publication number	US-9383605-B2
Application number	US-201414307633-A
Country	US
Kind code	B2
Filing date	Jun 18, 2014
Priority date	Feb 3, 2014
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A backlight unit includes a light source portion configured to provide light to a display panel, a reflection sheet arranged on a lower part of the light source portion, a mold frame accommodating the light source portion, and a support frame which supports the mold frame and includes a bottom portion, first and second side wall portions which extend upward from both end sides of the bottom portion and face each other, a ceiling portion which extends in a horizontal direction from an upper end of the first side wall portion, and a slant portion slanted downward from an end part of the ceiling portion and having one end that comes in contact with the end part of the ceiling portion and the other end that comes in contact with an upper end of the second side wall portion.

First claim

What is claimed is:

1. A backlight unit comprising:
a light source portion configured to provide light to a display panel;
a reflection sheet arranged on a lower part of the light source portion;
a mold frame accommodating the light source portion; and
a support frame which supports the mold frame and comprises:
a bottom portion;
first and second side wall portions which extend upward from both end sides of the bottom portion and face each other;
a ceiling portion which extends in a horizontal direction from an upper end of the first side wall portion; and
a slant portion slanted downward from an end part of the ceiling portion and having one end which contacts the end part of the ceiling portion and the other end which contacts an upper end of the second side wall portion,
wherein
a slant region of the extending reflection sheet is supported by the slant portion of the support frame.

2. The backlight unit of claim 1 , wherein a cavity, which is an inner space, is defined by the ceiling portion, the bottom portion, the first side wall portion, and the second side wall portion and extends along a length direction of the support frame.

3. The backlight unit of claim 1 , wherein the mold frame comprises:
a side wall portion extending in a vertical direction; and
a seat portion projecting by a predetermined distance in the horizontal direction, from the side wall portion.

4. The backlight unit of claim 3 , wherein
the side wall portion of the mold frame is fastened to the first side wall portion of the support frame, and
the seat portion of the mold frame is fastened to the ceiling portion of the support frame.

5. The backlight unit of claim 3 , further comprising a support arranged at an upper end of the side wall portion of the mold frame.

6. The backlight unit of claim 3 , wherein
the side wall portion of the mold frame and the first side wall portion of the support frame are fastened to each other by an engagement screw which penetrates the mold frame and the first side wall portion of the support frame, and
the seat portion of the mold frame and the ceiling portion of the support frame are fastened to each other by a fastening projection which is arranged on the seat portion of the mold frame and is inserted into a fastening hole which is defined in the ceiling portion of the support frame.

7. The backlight unit of claim 1 , wherein
the reflection sheet is bent toward the support frame.

8. The backlight unit of claim 7 , wherein a slope of the slant portion of the support frame is equal to a slope of the slant region of the reflection sheet.

9. The backlight unit of claim 7 , wherein an end part of the extending reflection sheet is inserted and fixed to a fixing hole which is defined in a side wall portion of the mold frame.

10. The backlight unit of claim 1 , wherein
the support frame further comprises four bar-shaped sub-support frames, and
neighboring sub-support frames are fastened to each other by an L-shaped fastening member.

11. The backlight unit of claim 1 , wherein the support frame further comprises:
first and second sides which face each other and third and fourth sides which face each other, and
at least one support bar having one end which is fastened to the third side and the other end which is fastened to the fourth side.

12. The backlight unit of claim 11 , further comprising at least one support column, which projects in a vertical direction from the support bar, arranged on the support bar.

13. The backlight unit of claim 1 , wherein at least one opening is defined in the slant portion of the support frame.

14. The backlight unit of claim 2 , wherein
the light source portion includes a first printed circuit board extending in the length direction and at least one light emitting lamp mounted on the first printed circuit board, and
the backlight unit further comprises a second printed circuit board arranged in the cavity and connection sockets electrically connected to the second printed circuit board, and
connection terminals of the first printed circuit board are inserted into the connection sockets, respectively, to electrically connect the second printed circuit board and the first printed circuit board to each other.

15. A liquid crystal display comprising:
a backlight unit;
a diffusion plate arranged on an upper part of the backlight unit;
at least one optical sheet arranged on an upper part of the diffusion plate; and
a display panel arranged on the at least one optical sheet,
wherein the backlight unit includes:
a light source portion configured to provide light to the display panel;
a reflection sheet arranged on a lower part of the light source portion;
a mold frame which accommodates the light source portion; and
a support frame which supports the mold frame, and comprises:
a bottom portion;

first and second side wall portions which extend upward from both end sides of the bottom portion and face each other;
a ceiling portion which extends in a horizontal direction from an upper end of the first side wall portion; and
a slant portion slanted downward from an end part of the ceiling portion and having one end which contacts the end part of the ceiling portion and the other end which contacts an upper end of the second side wall portion,
wherein
a slant region of the extending reflection sheet is supported by the slant portion of the support frame.

16. The liquid crystal display of claim 15 , wherein a cavity, which is an inner space, is defined by the ceiling portion, the bottom portion, the first side wall portion, and the second side wall portion and extends along a length direction of the support frame.

17. The liquid crystal display of claim 15 , wherein the mold frame comprises:
a side wall portion extending in a vertical direction; and
a seat portion projecting by a predetermined distance in the horizontal direction, from the side wall portion.

18. The liquid crystal display of claim 15 , wherein
the reflection sheet is bent toward the support frame.

19. The liquid crystal display of claim 15 , wherein the support frame further comprises:
first and second sides which face each other and third and fourth sides which face each other, and
at least one support bar having one end which is fastened to the third side and the other end which is fastened to the fourth side.

20. The liquid crystal display of claim 19 , further comprising at least one support column, which is provided to project in a vertical direction from the support bar, arranged on the support bar.

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Park Se Ki
• Ryu Su Chang
• Lee Jae Sang
• Kim Yong Hwi

Classifications

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133608 Primary

  including particular frames or supporting means · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F2001/133314

  Physics · mapped topic

• G02F2001/133328

  Physics · mapped topic