Bottom frame for liquid crystal display device, backlight assembly and liquid crystal display device using the same

1. A backlight assembly for liquid crystal display device, comprising:

a bottom frame including:

a bottom surface;

four side surfaces attached to the bottom surface, the four side surfaces together with the bottom surface define a space;

first and second of holes in two of the four side surfaces, the first and second holes opposite to each other in two opposite side surfaces; and

affixing structures at the bottom surface and spaced apart from each other; and

printed circuit boards on the bottom frame and spaced apart from each other, each of the printed circuit boards having a stripe shape and ends of the printed circuit boards inserted into the first and second holes in the two opposite side surfaces;

a plurality of light emitting diode lamps on each of the printed circuit boards; and

a reflecting sheet covering the bottom surface and the printed circuit boards, the reflecting sheet having a plurality of through-holes corresponding to the light emitting diode lamps,

wherein a width of each of the printed circuit boards substantially corresponds to a distance between two adjacent affixing structures,

wherein the affixing structures and the printed circuit boards form a flat top surface, wherein a size of each of the first and second holes is smaller than a size of each of the two opposite side surfaces, and wherein a circumference of each of the first and second holes is completely surrounded by the two opposite side surfaces.

2. The backlight assembly according to claim 1 , further comprising:

a transparent window spaced apart from the light emitting diode lamps, the transparent window having diverters corresponding to the light emitting diode lamps; and

optical sheets on the transparent window, a periphery of the optical sheets disposed over top of the four side surfaces.

3. The backlight assembly according to claim 1 , further comprising four joint units combining the four side surfaces using a plurality of combining mechanisms.

4. The backlight assembly according to claim 3 , wherein the four joint units are on two side surfaces opposite to each other and extend from two other side surfaces for combining the four side surface with rivets.

5. The backlight assembly according to claim 3 , wherein each of the four side surfaces includes a joint unit for combining the four side surfaces with rivets.

6. The backlight assembly according to claim 1 , wherein the four side surfaces have top surfaces even with each other.

7. The backlight assembly according to claim 1 , wherein the affixing structures are corrugations of the bottom surface.

8. The backlight assembly according to claim 1 , wherein each of the affixing structures is connected between the two opposite side surfaces having the first and second holes, and the affixing structures are alternately arranged with the printed circuit boards.

9. The backlight assembly according to claim 1 , wherein each of the light emitting diode lamps includes a bottom portion attached to one of the printed circuit boards and a lens portion that protrudes from the printed circuit boards.

10. The backlight assembly according to claim 9 , wherein the affixing structures have substantially the same height as the bottom portion of the light emitting diode lamps above the bottom surface of the bottom frame.

11. The backlight assembly according to claim 1 , wherein a cross-sectional area of each the first and second holes is larger than a cross-sectional area of each end of the printed circuit boards.

12. The backlight assembly according to claim 1 , wherein the printed circuit boards are metal core printed circuit boards.

13. The backlight assembly according to claim 1 , wherein each of the printed circuit boards includes at least two rows of light emitting diode lamps.

14. A liquid crystal display device, comprising:

a backlight assembly including:

a bottom frame including:

a bottom surface;

four side surfaces attached to the bottom surface, the four side surfaces together with the bottom surface define a space;

first and second holes on the four side surfaces, the first and second holes opposite to each other;

a plurality of affixing structures at the bottom surface between the two opposite side surfaces having the first and second holes; and

at least two protrusions extending from the four side surfaces to the space, the protrusions are at a level higher from the bottom surface than the first and second holes; and

printed circuit boards on the bottom frame and spaced apart from each other, each of the printed circuit boards having a stripe shape and both ends of each of the printed circuit boards are inserted through the first and second holes at the two opposite side surfaces, respectively;

a plurality of light emitting diode lamps on each of the printed circuit boards;

a reflecting sheet covering the bottom surface and the printed circuit boards, the reflecting sheet having through-holes corresponding to the light emitting diode lamps;

a transparent window over the protrusion and spaced apart from the light emitting diode lamps, the transparent window having diverters corresponding to the light emitting diode lamps;

optical sheets disposed over the four side surfaces;

a liquid crystal panel on the plurality of optical sheets;

a main frame surrounding the liquid crystal panel and the bottom frame; and

a top frame surrounding a front edge of the liquid crystal panel,

wherein a width of each of the printed circuit boards substantially corresponds to a distance between two adjacent affixing structures,

wherein the affixing structures are alternately arranged with the printed circuit boards, and wherein the affixing structures and the printed circuit boards form a flat top surface, wherein a size of each of the first and second holes is smaller than a size of each of the two opposite side surfaces, and wherein a circumference of each of the first and second holes is completely surrounded by the two opposite side surfaces.

15. The backlight assembly according to claim 14 , wherein the printed circuit boards include at least two rows of light emitting diode lamps.

16. A backlight assembly for liquid crystal display device, comprising:

a bottom frame including:

a bottom surface;

four side surfaces attached to the bottom surface, the four side surfaces together with the bottom surface define a space; and

first and second of holes in two of the four side surfaces, the first and second holes opposite to each other in two opposite side surfaces; and

printed circuit boards on the bottom frame and spaced apart from each other, each of the printed circuit boards having a stripe shape and ends of the printed circuit boards inserted into the first and second holes in the two opposite side surfaces; and

connectors attached to at least one end of each of the printed circuit boards for providing power to the printed circuit boards,

wherein each of the printed circuit board has a center portion and end portions having a smaller width then the center portion and includes at least two rows of light emitting diode lamps, wherein each of the first and second holes has substantially the same width as each end portion,

wherein a size of each of the first and second holes is smaller than a size of each of the two opposite side surfaces, and wherein a circumference of each of the first and second holes is completely surrounded by the two opposite side surfaces.

17. The backlight assembly according to claim 16 , wherein the at least one end of each the printed circuit boards is inserted into one of the first and second holes so as to extend out of the space.