Patent ID: 7073933

Claim:
A light guide plate comprising: a light incidence portion having a light incidence surface where light emitted from a point source of light enters; a light reflection surface formed facing the light incidence surface to reflect light from the light incidence surface; a light outgoing surface arranged between the light incidence surface and the light reflection surface, and having a circularly polarizing plate intimately adhered onto the surface thereof; an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and side end surfaces arranged between the light incidence surface and the light reflection surface that are formed at both ends of the light outgoing surface and of the opposing surface; wherein the light incident portion comprises a light guide passage having sloped portions toward the light outgoing surface and the opposing surface.