Patent ID: 8348445

Claim:
A direct-type backlight unit comprising: A plurality of light emitting diodes; a planar arrangement surface on which the plurality of light emitting diodes are arranged; and a plurality of reflecting surfaces that are formed at a plurality of edges of the planar arrangement surface and reflect light emitted from the plurality of light emitting diodes, wherein light emitted from the light emitting diodes and light reflected from the plurality of reflecting surfaces irradiate toward an irradiation area surrounded by the plurality of reflecting surfaces, the plurality of reflecting surfaces are inclined at an angle that is smaller than 90 degrees with respect to an extension surface of the planar arrangement surface that extends toward an outside of the reflecting surface, the plurality of reflecting surfaces include reflecting surfaces having a large inclination angle and reflecting surfaces having a small inclination angle that is smaller than the large inclination angle, and the light emitting diodes that are arranged along the reflecting surfaces having the large inclination angle are closer to an edge of the irradiation area than the other light emitting diodes that are arranged along the reflecting surfaces having the small inclination angle, in a plan view of the irradiation area.