Patent ID: 7293905

Claim:
An area light source device comprising: a light source; a light guide including an incidence surface on which emission light from the light source is incident, and a first major surface and a second major surface, which are opposed to each other and from which the incident light on the incidence surface emerges; an optical sheet that is disposed on the second major surface side of the light guide and has a reflective surface on a side thereof that is opposed to the second major surface; and a film member, that is disposed between the light guide and the optical sheet, has light transmissivity and has a projection-and-recess-shaped portion on a surface thereof, wherein the optical sheet has, on the reflective surface thereof, a projection-and-recess-shaped portion that differs in size from the projection-and-recess-shaped portion of the film member, and the projection-and-recess-shaped portion of the film member is larger in size than the projection-and-recess-shaped portion of the optical sheet.