A backlight unit and a display device includes a plurality of light sources and a color conversion layer on a reflective layer, thereby removing expensive color conversion sheets and supplying high-quality white light. A backlight unit includes a printed circuit; light sources on the printed circuit; a reflective layer on at least a partial area of an area in which the light sources are not disposed on the printed circuit; a transparent film above the light sources and the reflective layer and spaced apart from the light sources and the reflective layer; light diffusion patterns on at least one of the top and bottom of the transparent film and corresponding to each of the light sources; a first color conversion layer on the reflective layer; and a second color conversion layer on at least one of a top surface and a bottom surface of the light diffusion patterns.