| 摘要 |
A projection display apparatus including an optical system having a lens for projecting a light emitted from a light source onto a screen and a cooler having an exhaust fan for cooling the light source is disclosed. The projection display apparatus includes a light receiver for receiving a light reflected from the screen, a first controller for controlling a quantity of the light emitted from the light source in accordance with an intensity of the light received by the light receiver, a heat sensor for sensing a heat given off from the light source, and a second controller for controlling a volume of air exhausted by the exhaust fan per unit time in accordance with a quantity of the heat sensed by the heat sensor.
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