Patent ID: 7705922

Claim:
A projection type image display apparatus comprising an optical part cooling mechanism that cools three sheets of liquid crystal panels corresponding to a red light, a green light, and a blue light obtained by splitting the light from an optical source lamp and optical parts such as polarizing plates disposed at an incident side and an outgoing side of each liquid crystal panel by an air from three sets of fans, and modulating a light irradiated from a light source lamp based on an image signal, and enlarging and projecting the modulated image light, wherein the incident side and the outgoing side of the each liquid crystal panel are formed with a discharge port for discharging the air from the fan through a duct; a polarizing beam splitter aligning a polarizing direction of the light from the light source lamp is formed with a discharge port for discharging the air from any of the fans through the duct; and an incident side discharge port and an outgoing side discharge port of the liquid crystal panel corresponding to the blue light are formed with the duct so as to discharge the air from each of different fans.