Patent ID: 8562143

Claim:
A projection display device that modulates light on a basis of image information to form an optical image, and projects the formed optical image, comprising: a light source; an optical modulator that modulates light emitted from said light source; a cooling unit configured to cool said light source; a first temperature sensor that measures a temperature of said light source; a second temperature sensor that measures a temperature of said optical modulator; a controller that controls said cooling unit; and a common support member on which at least said light source and said optical modulator are mounted, wherein said light source and said optical modulator are thermally connected via said common support member, wherein said optical modulator comprises a panel case, a panel cover, a panel holder which is secured to said panel case, and a liquid crystal panel, wherein said panel case has an emission window, wherein said panel cover has an incident window, wherein four sides of said liquid crystal panel are held between a perimeter of said incident window and a perimeter of said emission window, wherein said panel holder is secured to said common support member, wherein a heat of said light source is transferred to said optical modulator, wherein said controller stops said cooling unit when the temperature of said optical modulator measured by said second temperature sensor becomes lower than a reference temperature, and wherein said controller operates said cooling unit based on the temperature of said light source measured by said first temperature sensor when the temperature of the optical modulator measured by said second temperature sensor becomes higher than the reference temperature.