Projection display device

A projection display device comprising:

• a light source;
• a modulation device that modulates a light beam emitted from the light source;
• a projection lens that projects the light modulated by the modulation device onto a projection plane;
• a power supply that supplies electric power for driving the projection display device;
• an exhaust fan that exhausts air inside the projection display device to outside the projection display device;
• a modulation device intake fan that draws in air from outside the projection display device for cooling components inside the projection display device, including the modulation device;
• and
• a power supply intake fan that draws in air from outside the projection display device for cooling components inside the projection display device, including the power supply, only the power supply intake fan being driven for a predetermined period after the projection display device is powered on;
• a rotation speed control device that controls a rotation speed of the exhaust fan;
• a lens that is placed in the optical path between the light source and the modulation device;
• a first temperature detecting device that detects a temperature in a vicinity of the light source;
• a second temperature detecting device that detects a temperature in a vicinity of the lens, the rotation speed of the exhaust fan being controlled based on the detected temperatures from the first temperature detecting device and the second temperature detecting device;
• a rotation speed control device that controls a rotation speed of the modulation device intake fan;
• a third temperature detecting device that detects a temperature in a vicinity of the modulation device;
• and
• a fourth temperature detecting device that detects a temperature of air outside the projection display device, the rotation speed of the modulation device intake fan being controlled based on the detected temperatures from the third temperature detecting device and the fourth temperature detecting device.