Patent ID: 7832915

Claim:
A surface light source device comprising: a first light source disposed so as to face a reflecting surface of a light reflecting member; a second light source having spectrum selectivity different from that of the first light source; a light diffusing member configured to diffuse light rays emitted from the first light source and the second light source; and a light control member formed from a transparent material and disposed between the first light source and the light diffusing member so as to face the first light source and the light diffusing member, the light control member directing the light rays emitted from the first light source and the second light source in a predetermined direction; wherein the light control member has a first side facing the light diffusing member, a second side facing the first light source in a direction opposite the light diffusing member, and one or more outer peripheral surfaces disposed laterally from the first and second sides; wherein the second light source is disposed so as to face at least one of the one or more outer peripheral surfaces of the light control member; wherein the second side of the light control member has an irregularity pattern; and wherein the light rays emitted from the second light source are directed by the light control member inside the light control member and are directed by the irregularity pattern towards the light diffusing member.