A display device includes a display panel receiving light and displaying an image, a light guide plate guiding the light to the display panel, a printed circuit board disposed adjacent to one side of the light guide plate and including first and second areas alternately defined therein, light sources mounted on the printed circuit board to correspond to the first area and to supply the light to the light guide plate, a first barrier wall disposed on the printed circuit board and extending in a direction in which the light sources are arranged, and a second barrier wall facing the first barrier wall such that the light sources are disposed between the first and second barrier walls, the second barrier wall disposed on the printed circuit board, and extending in the direction.