Patent ID: 7048427

Claim:
A planar light source device comprising: a light guide member having a front face, a rear face and an end face, the rear face having light scattering members for scattering light, and the end face having at least one corner-cut portion; at least one first light source on the corner-cut portion; and at least one second light source arranged on the portion of the end face other than the corner-cut portion; wherein said light guide member includes a first area having no light scattering members, the first area being smaller in area than a second area of the light guide member occupied by the light scattering members on the rear face of the light guide member, the second area extending between the first area and at least one edge of the rear face, the first area introducing light from the first and second light sources into the light guide member, and whereby the light scattered by said light scattering members is emitted from the front face of the light guide member.