A display device comprising: a display panel having a plurality of electrodes and pixels; an edge type backlight provided adjacent to the display panel, the edge type backlight having a plurality of optical sheets adjacent to the display panel, a light guide panel having a first light incident edge area to receive light from a first direction and a light exit area to transmit light received through the first light incident edge area in a second direction towards the plurality of optical sheets, the first and second directions being different directions, a first light source assembly, the first incident edge area of the light guide panel being adjacent to the first light source assembly to receive light emitted by said first light source assembly, and a reflector adjacent to the light guide panel to reflect light towards the second direction; and a bottom cover including a quadrangular-shaped plate, the plate provided adjacent to the reflector and having a prescribed length in the first direction and a prescribed width in a third direction, the plate further including a first post having a first prescribed height in the second direction, the reflector having a first opening and the light guide panel having a first opening, wherein the first opening of the reflector and the first opening of the light guide panel are mutually overlaid and have a combined depth in the second direction to receive the first post, characterized in that the plate further includes a first peg, the first peg having a height in the second direction less than the first post, the first post being positioned closer to the first light source assembly than the first peg, wherein the first light source assembly is a first LED assembly having a plurality of light emitting diodes provided on a first substrate and aligned in the third direction, the first LED assembly further including a first support having an L-shaped cross-section extending adjacent to and supporting the first substrate, the first support having a portion extending in the first direction and that includes a first opening and a second opening, which are fitted over the first post and the first peg, respectively, the first opening of the first support overlaying the first opening of the reflector and the first opening of the light guide plate. a display panel having a plurality of electrodes and pixels; an edge type backlight provided adjacent to the display panel, the edge type backlight having a plurality of optical sheets adjacent to the display panel, a light guide panel having a first light incident edge area to receive light from a first direction and a light exit area to transmit light received through the first light incident edge area in a second direction towards the plurality of optical sheets, the first and second directions being different directions, a first light source assembly, the first incident edge area of the light guide panel being adjacent to the first light source assembly to receive light emitted by said first light source assembly, and a reflector adjacent to the light guide panel to reflect light towards the second direction; and a bottom cover including a quadrangular-shaped plate, the plate provided adjacent to the reflector and having a prescribed length in the first direction and a prescribed width in a third direction, the plate further including a first post having a first prescribed height in the second direction, the reflector having a first opening and the light guide panel having a first opening, wherein the first opening of the reflector and the first opening of the light guide panel are mutually overlaid and have a combined depth in the second direction to receive the first post, characterized in that the plate further includes a first peg, the first peg having a height in the second direction less than the first post, the first post being positioned closer to the first light source assembly than the first peg, wherein the first light source assembly is a first LED assembly having a plurality of light emitting diodes provided on a first substrate and aligned in the third direction, the first LED assembly further including a first support having an L-shaped cross-section extending adjacent to and supporting the first substrate, the first support having a portion extending in the first direction and that includes a first opening and a second opening, which are fitted over the first post and the first peg, respectively, the first opening of the first support overlaying the first opening of the reflector and the first opening of the light guide plate.