Backlight unit and liquid crystal display device having the same
View Patent ↗Provided is a backlight unit of an LCD device including a printed circuit board; a plurality of light emitting diodes (LEDs) mounted on the printed circuit board; and a bottom chassis formed with only an outer frame and having the printed circuit board housed thereon.
1. A backlight unit of a liquid crystal display (LCD) device comprising:
a printed circuit board;
a plurality of light emitting diodes (LEDs) mounted on the printed circuit board; and
a bottom chassis formed with only an outer frame and having the printed circuit board housed thereon.
2. The backlight unit according to claim 1 , wherein the printed circuit board and the bottom chassis are formed of the same metallic material.
3. The backlight unit according to claim 2 , wherein the printed circuit board and the bottom chassis are formed of steel.
4. The backlight unit according to claim 1 further comprising:
an optical sheet provided on the LEDs.
5. The backlight unit according to claim 4 , wherein the optical sheet includes a diffusion sheet, a condensing sheet provided on the diffusion sheet, and a protective sheet provided on the condensing sheet.
6. The backlight unit according to claim 1 , wherein the bottom chassis includes:
a first frame formed along the edge of the printed circuit board;
at least one second frame which divides a region defined by the first frame; and
a third frame which is formed to extend upward from the first frame at a predetermined height such that a housing space is provided by the first to third frames.
7. The backlight unit according to claim 6 , wherein the printed circuit board is bonded to the first frame by surface mounding technology (SMT).
8. The backlight unit according to claim 6 , wherein the printed circuit board is fixed to the second frame through a screw.
9. An LCD device comprising:
a liquid crystal panel; and
a backlight unit that supplies light to the liquid crystal panel,
wherein the backlight unit includes:
a printed circuit board having a plurality of LEDs mounted thereon; and
a bottom chassis formed with only an outer frame and having the printed circuit board housed thereon.
10. The LCD device according to claim 9 , wherein the printed circuit board and the bottom chassis are formed of the same metallic material.
11. The LCD device according to claim 10 , wherein the printed circuit board and the bottom chassis are formed of steel.
12. The LCD device according to claim 9 further comprising:
an optical sheet provided on the LEDs.
13. The LCD device according to claim 12 , wherein the optical sheet includes a diffusion sheet, a condensing sheet provided on the diffusion sheet, and a protective sheet provided on the condensing sheet.
14. The LCD device according to claim 9 , wherein the bottom chassis includes:
a first frame formed along the edge of the printed circuit board;
at least one second frame which divides a region defined by the first frame; and
a third frame which is formed to extend upward from the first frame at a predetermined height such that a housing space is provided by the first to third frames.
15. The LCD device according to claim 14 , wherein the printed circuit board is bonded to the first frame by the SMT.
16. The LCD device according to claim 14 , wherein the printed circuit board is fixed to the second frame through a screw.
17. The LCD device according to claim 9 further comprising:
an upper case that presses the edge of the liquid crystal panel so as to fix the liquid crystal panel on the optical sheet.