Patent ID: 8730579

Claim:
An optical sheet disposed on a light guide plate of a backlight assembly, comprising: a base film in which light is incident from a lower side; a plurality of prism patterns protruded to be spaced apart from each other by a predetermined interval on a first surface of the base film to enhance the front luminance of light incident from the lower side of the base film; and a diffusion member disposed between the adjacent prism patterns disposed on the first surface of the base film to have a diffusion surface in parallel with the base film, the diffusion member comprising a plurality of diffusion dots capable of enhancing the luminance uniformity of light incident from the lower side of the base film, wherein scratches or cracks are formed on a surface of each of the prism patterns and a surface of the diffusion dots to enhance luminance uniformity, a viewing angle and a half-power angle of the optical sheet.