Patent ID: 7651249

Claim:
A liquid crystal display device comprising: a liquid crystal panel; a light guide plate provided in a rear surface of said liquid crystal panel; a plurality of light sources arranged in such a manner as to input a beam of light to said light guide plate from both side surfaces of said light guide plate; a substrate on which said light sources are mounted; a heat sink connected to a surface of said substrate on which said light sources are not mounted; a blower device for blowing an air cooling said heat sink; and said liquid crystal panel, said light guide plate, said light sources, said substrate, said heat sink, and said blower device being stored in a casing, wherein an air intake port is open to a lower side of said casing, and an exhaust port is open to an upper side of said casing, wherein an inner portion of said casing comprises: a natural convection path in which an air taken into the inner portion of said casing via said air intake port rises in a rear surface side of said light guide plate on the basis of a natural convection, and is exhausted from said exhaust port; and a forced convection path in which the air taken into the inner portion of said casing by said blower device rises on the basis of a forced convection caused by the ventilation of said blower device while being along said heat sink extending from the lower side toward the upper side of said casing, and is exhausted from said exhaust port, and wherein said natural convection path and said forced convection path are comparted by a partition wall.