| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid crystal projector detecting partial rise in temperature to permit drive voltage control of a cooling fan when an internal temperature of the liquid crystal projector partially rises. SOLUTION: The liquid crystal projector is provided with plural temperature sensors for detecting the internal temperature of the liquid crystal projector, and a fan control circuit controlling drive voltage of the cooling fan based on the temperature detected by each temperature sensor. The fan control circuit contains a means calculating a ratio of the detected temperature to the temperature range defined depending on an installed position of each temperature sensor based on both the detected temperature and the temperature range for each sensor, and a means controlling drive voltage of the cooling fan based on the maximum value among those calculated ratios of the detected temperature to the temperature range for each sensor.
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