Patent ID: 8345187

Claim:
A liquid crystal display device, comprising: an optical switching member which includes a first substrate and a second substrate sandwiching a liquid crystal layer; a light guide panel made of a thermoplastic material disposed on a back side of the optical switching member; and a light source disposed on at least one side of the light guide panel, the light guide panel comprising, on at least one of a front surface and a back surface thereof, a plurality of surface structures including: a first raised surface extending outward from the at least one of the front surface and the back surface; a first light reflection surface which continues from the first raised surface and enters inside the at least one of the front surface and the back surface, from the first raised surface; a second light reflection surface which continues from the first light reflection surface and extends outside the at least one of the front surface and the back surface, from the first light reflection surface; and a second raised surface which continues from the second light reflection surface and further continues, from the second light reflection surface, to the at least one of the front surface and the back surface; wherein, of the plurality of surface structures, the thermoplastic material locating outside the at least one of the front surface and the back surface is equal in volume to a void portion formed inside the at least one of the front surface and the back surface.