Back light unit and liquid crystal display having the same

摘要

A back light unit and a liquid crystal display having the same are provided. The back light unit includes a light guide plate which has a substantially rectangular plate shape and has a front surface and a rear surface which are disposed parallel to each other and four edge surfaces which are disposed perpendicular to the front surface and the rear surface, at least one light incident surface which is perpendicular to the front surface and the rear surface being formed on at least one of four corner regions of the light guide plate; and a light source unit which is adjacently disposed on the light incident surface and projects a light into the light guide plate via the light incident surface. If the angle between an edge surface which is relatively longer than two edge surfaces which are adjacent to the light incident surface and an incident direction of a light which is projected from the light source unit is ¸ , the angle ¸ is 20°< ¸ < 45°.