Patent ID: 8421946

Claim:
A backlight unit comprising: a bottom cover having a height difference region, the height difference region dividing the bottom cover into a first region and a second region; a flexible printed circuit board side-contacting an inner side, the inner side corresponding to the height difference region of the bottom cover; a plurality of light emitting diodes mounted on the flexible printed circuit board; a light guide plate disposed on one side of the light emitting diode; and a first reflective sheet attached to a bottom of the light guide plate to correspond to the second region of the bottom cover, wherein the bottom cover includes a first part extending from the bottom cover, and a second part extending from the first part, the second part overlapping with the light emitting diode, wherein a bottom of one side of the light guide plate side-contacts the flexible printed circuit board, and the one side of the light guide plate corresponds to the light emitting diode, wherein the first region overlapped with the flexible printed circuit board corresponds to the light emitting diode, wherein the second region overlapped with the flexible printed circuit board and the reflective sheet corresponds to an opposite side of the light emitting diode, and wherein the height difference region has a height difference between the first region and the second region in order to dispose the reflective sheet between the light guide plate and the flexible printed circuit board.