Patent ID: 7768594

Claim:
A liquid crystal display device having a liquid crystal display panel and a back light disposed on the back face of said liquid crystal display panel; wherein said back light has a light guide plate, a point light source disposed on a side face of said light guide plate, and an outgoing light control board disposed on said light guide plate on the side of said liquid crystal display panel; wherein said outgoing light control board has a plurality of columnar convex portions at least partly circular in cross-sectional shape in a plane extending substantially perpendicular to a major surface of said light guide plate and substantially circular in cross-sectional shape in a plane extending substantially parallel to the major surface of said light guide plate on a surface of said outgoing light control board facing the major surface of said light guide plate, and is disposed on the major surface of said light guide plate on the side of said liquid crystal display panel with said columnar convex portions made adherent to the major surface of said light guide plate on the side of said liquid crystal display panel; and wherein said columnar convex portions of said outgoing light control board are formed in a matrix shape and also formed in an area corresponding to a non-effective area between an effective light emitting area for said liquid crystal display panel and said point light source.