Patent ID: 8582056

Claim:
A liquid crystal display device, comprising: a lightguide comprising: a light exit surface from which light exits; a reflection surface opposed to the light exit surface; and a light entrance surface, which is one side surface with respect to the light exit surface and through which the light enters; a liquid crystal panel arranged opposed to the light exit surface of the lightguide; and a plurality of light sources for causing the light to enter through the light entrance surface, wherein: the lightguide further comprises a plurality of local-area line-shaped protrusions, which are each a line-shaped protrusion extending in a first direction intersecting the light entrance surface, the plurality of local-area line-shaped protrusions being arranged on a region of the light exit surface in an intermediate portion of the light exit surface between two adjacent light sources of the plurality of light sources adjacent the light entrance surface; and a plurality of wide-area line-shaped protrusions, which are each a line-shaped protrusion extending in the first direction, the plurality of wide-area line-shaped protrusions being arranged in a region on the light exit surface and some of the plurality of wide-area line-shaped protrusion not being arranged in the intermediate portion of the light exit surface between the two adjacent light sources; each of the plurality of local-area line-shaped protrusions reflects light inside the lightguide so that a component of the light which is orthogonal to the first direction is weakened; each of the plurality of local-area line-shaped protrusions having a first end spaced from the light entrance surface and provided at a position closer to the light entrance surface than a second end which is provided at a position farther from the light entrance surface, of a light exit region on the light exit surface, the light exit region corresponding to a display region; a distance between the light entrance surface and one of the second ends of the plurality of local-area line-shaped protrusions, which is farthest from the two adjacent light sources, is larger than a distance between the light entrance surface and one of the second ends of the plurality of local-area line-shaped protrusions, which is closest to any one of the two adjacent light sources; and each of the plurality of wide-area line-shaped protrusions having a first end spaced at least a predetermined distance from the light entrance surface, the first end of one of the plurality of wide-area line shaped protrusions disposed at a position within the intermediate portion of the light exit surface farthest from the two adjacent light sources having a distance from the light entrance surface which is larger than a distance of the first end of the some of the plurality of wide-area line shaped protrusions not arranged in the intermediate portions of the light exit surface.