Patent ID: 6991335

Claim:
A liquid crystal projector comprising: a light source lamp; a liquid crystal panel for displaying at least one color of red, green and blue; a power source for supplying electric power to an element in the liquid crystal projector; a fan for removing heat generated by said power source and said lamp; a water-cooling jacket provided on an inner surface of a part of an external wall of the liquid crystal projector, which part is adjacent to said lamp; a metal pipe arrangement for heat radiation, placed in a part of the external wall except said part of the external wall having said water-cooling jacket on the inner surface thereof; and a cooling liquid driving means for driving cooling liquid to flow in the water-cooling jacket receiving the heat radiated from said lamp, wherein the cooling liquid receiving the heat generated by said lamp circulates in a circulation path through said water-cooling jacket, said metal pipe arrangement and said cooling liquid driving means to emit the heat to the outside through said metal pipe arrangement.