A backlight assembly, usable in a display device, includes a plurality of light sources and a light guiding plate guiding light emitted from the light sources, wherein the light sources are arranged corresponding to a side of the light guiding plate and the side includes a central portion. The light sources include first light sources as a first group arranged on the central portion of the light guiding plate, and second light sources as a second group adjacent to the first group, wherein a pitch of the first light sources is smaller than a pitch of the second light sources.