A backlight assembly includes a light source which generates and emits light, and an optical member which is between the light source and a display panel of a display device and adjusts a path of the light emitted from the light source. The optical member includes a first base film, a second base film which faces the first base film and is closer to the display panel than the first base film, an optical pattern which is provided in plural spaced apart from each other and disposed between the first and second base films, a reflecting layer which is disposed on the optical patterns and reflects light incident to the optical member, and a wavelength conversion pattern between the first and second base films and alternately disposed with the optical patterns. The wavelength conversion pattern converts a source wavelength of the light emitted from the light source.