Patent ID: 8459857

Claim:
A planar light source device comprising: a plurality of point light sources arranged on a substantially straight line; a light guide plate, wherein light emitted from the point light sources enters into the light guide plate from an incident surface, and wherein the light spread out into a planar shape and the light guide plate emits the light from an emitting surface; and a frame, which holds the point light sources and the light guide plate, and which includes an opening, wherein the frame has a protrusion that is provided on a light source side of a peripheral end portion of the emitting surface of the light guide plate, wherein the point light sources are arranged at the light source side, wherein the protrusion has difference widths parallel to the emitting surface, and wherein a width of a portion of the protrusion, which corresponds to the position where the point of the point light source is arranged, is wider than a width of a portion of the protrusion, which corresponds to a position between the point light sources.