BACK LIGHT UNIT AND DISPLAY DEVICE

• US 20150016090A1
• Filed: 06/16/2014
• Published: 01/15/2015
• Est. Priority Date: 07/11/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Ki Chang, SIM, Byung Kook, LEE, Sung-Hun, MATSUZAWA, Masaru, PARK, Hyun Su
• Granted Patent: US 9,423,653 B2
• Time in Patent Office: Days
• US Class Current: 362/97.1
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means

Abstract

A backlight unit includes: a bottom chassis including a lower portion and side portions enclosing the lower portion; a light source plate to which a light source is attached; a diffuser configured to diffuse light generated from the light source; an optical sheet disposed on the diffuser and adapted to further diffuse the light diffused by the diffuser; and a first mold including a first inclined portion which is disposed between the diffuser and the optical sheet and may prevent the diffuser and the optical sheet from contacting each other, the first inclined portion may reflect light transmitted by the diffuser and emitted from the side of the diffuser toward the bottom chassis.

Claims

1. A backlight unit, comprising:

a bottom chassis including a lower portion and side portions enclosing the lower portion;

a light source plate to which a light source is attached;

a diffuser for diffusing light generated from the light source;

an optical sheet on the diffuser for further diffusing the light diffused by the diffuser; and

a first mold including a first inclined portion between the diffuser and the optical sheet to prevent the diffuser and the optical sheet from contacting each other, and the first inclined portion reflecting light emitted from a side of the diffuser toward the bottom chassis.

2. The backlight unit as claimed in claim 1, wherein an end of the first inclined portion is seated on one of the side portions of the bottom chassis.

3. The backlight unit as claimed in claim 2, wherein:

the optical sheet is disposed at an upper end of the first mold, and

the diffuser is under the first inclined portion.

4. The backlight unit as claimed in claim 3, further comprising:

a second mold,

wherein the diffuser is seated on an upper portion of the second mold and is spaced apart from the first inclined portion.

5. The backlight unit as claimed in claim 4, wherein the second mold further includes a second inclined portion which reflects the light generated from the light source toward the diffuser.

6. The backlight unit as claimed in claim 5, wherein:

a portion of the second mold is disposed on the bottom chassis, and

the second inclined portion is spaced apart from the bottom chassis.

7. The backlight unit as claimed in claim 6, wherein the first mold is connected to the second mold by a connection portion.

8. The backlight unit as claimed in claim 7, wherein the connection portion connects the upper portion of the second mold to an end portion of the inclined portion of the first mold.

9. The backlight unit as claimed in claim 8, wherein the light source is a light emitting diode.

10. The backlight unit as claimed in claim 8, wherein the light source is a cold cathode fluorescent lamp.

11. A display device, comprising:

a display panel; and

a backlight unit adapted to supply light to the display panel,

wherein the backlight unit includes;

a bottom chassis including a lower portion and side portions enclosing the lower portion;

a light source plate onto which a light source is attached;

a diffuser for diffusing light generated from the light source;

an optical sheet on the diffuser for further diffusing the light diffused by the diffuser; and

a first mold including a first inclined portion between the diffuser and the optical sheet, to prevent the diffuser and the optical sheet from contacting to each other, and the first inclined portion reflecting light emitted from a side of the diffuser toward the bottom chassis.

12. The display device as claimed in claim 11, wherein an end of the first inclined portion of the first mold is seated on one of the side portions of the bottom chassis.

13. The display device as claimed in claim 12, wherein:

the optical sheet is disposed at an upper end of the first mold, and

the diffuser is under the first inclined portion.

14. The display device as claimed in claim 13, further comprising:

a second mold,

wherein the diffuser is seated on an upper portion of the second mold and is spaced apart from the first inclined portion.

15. The display device as claimed in claim 14, wherein the second mold further includes a second inclined portion which reflects the light generated from the light source toward the diffuser.

16. The display device as claimed in claim 15, wherein:

a portion of the second mold is disposed on the bottom chassis, and

the second inclined portion is spaced apart from the bottom chassis.

17. The display device as claimed in claim 16, wherein the first mold is connected to the second mold by a connection portion.

18. The display device as claimed in claim 17, wherein the connection portion connects the upper portion of the second mold to an end portion of the inclined portion of the first mold.

19. The display device as claimed in claim 18, wherein the light source is a light emitting diode.

20. The display device as claimed in claim 18, wherein the light source is a cold cathode fluorescent lamp.