Patent ID: 8223296

Claim:
A backlight unit comprising: a bottom cover that defines a plurality of luminescent regions in first and second directions substantially perpendicular to each other; a plurality of light guide plates disposed in the luminescent regions; a LED array including a substrate having a flat surface parallel to the bottom cover and a plurality of LEDs on a first region of the substrate at the side surfaces of the light guide plates along the first direction; and an optical sheet disposed over the light guide plates and the LED array, wherein a second light guide plate of adjacent light guide plates in the second direction overlaps an incident portion of a first light guide plate of the adjacent light guide plates to substantially cover the LEDs, and wherein the substrate is fixed under incident portion of the light guide plates along the first direction, wherein only a portion of the substrate other than the first region is fixed under the incident portion of the light guide plates, and wherein the two light guide plates adjacent to each other and the substrate are fastened to the bottom cover by a screw.