| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection display device which can appropriately control temperature inside a housing with simple constitution.SOLUTION: A temperature sensor 90 is arranged on an outside air suction path, detects the temperature of outside air taken into the housing, and generates analog voltage V1 in accordance with the detected temperature of the outside air. The temperature sensor 90 directly inputs the generated voltage V1 to a fan driving circuit 80 without through a controller 50. A fan driving circuit 80 generates drive voltage V2 for driving a ventilation fan 70 based on the output voltage V1 of the temperature sensor 90, and outputs the generated drive voltage V2 to the ventilation fan 70. The fan driving circuit 80 generates drive voltage V3 for driving a suction fan 60 based on the output voltage V1 of the temperature sensor 90, and outputs the generated drive voltage V3 to the suction fan 60. |
