Patent ID: 8212963

Claim:
A liquid-crystal display device comprising: a liquid crystal panel; a light source unit which illuminates the liquid crystal panel from the back surface thereof; and a diffuser board which is provided between the light source unit and the liquid crystal panel to diffuse the light emitted by the light source unit; wherein the light source unit includes a housing having an open front surface and a reflective surface formed inside of the housing, the light source unit including a plurality of point light sources arranged on a surface in the housing opposite to the open front surface so as to emit light toward the open front surface; wherein the diffuser board is provided so as to cover the open front surface of the housing, the diffuser board having diffusion portions formed by diffusion patterns at a surface of the diffuser board facing the liquid crystal panel and having surfaces which are convexly raised at positions corresponding to the positions of the point light sources so that some of light beams emitted from the light source unit are reflected from the diffusion portions of the diffuser board and others of the light beams penetrate the diffuser board toward the back surface of the liquid crystal panel; wherein each of the diffusion patterns includes a plurality of micro lenses formed by the surface of the diffuser board being raised to have a circular cone shape or a pyramid shape; and wherein the plurality of micro lenses are arranged adjacent to one another so as to be positioned around a central position corresponding to the position of the point light source, the plurality of micro lenses differing in shape at a position near the central position and at a position distant from the central position, the plurality of micro lenses which are positioned equidistant from the central position having substantially the same shape.