A backlight assembly includes a light guiding plate, a light source and a bottom receiving plate. The light source is disposed at a first side of the light guiding plate. The bottom receiving plate includes a bottom surface and a side wall to form a receiving space in which at least a portion of the light guiding plate is placed. The bottom surface is smaller than a lower surface of the light guiding plate and has a plurality of openings formed through the bottom surface. The side wall extends from the bottom surface.