Projection display device and method for controlling the same

A projection display device comprising:

• a device main body including an image projecting section projecting an image;
• a shutter that opens and closes an opening for ventilation, the opening of the device main body;
• an electricity storage section storing power from an external power source and supplying the stored power as operating power;
• an interruption detecting section detecting an interruption of the external power source, wherein if the interruption detecting section detects a power supply from the external power source is stopped and a time in which the power supply is stopped is longer than a predetermined time, the interruption detecting section detects that the external power source is interrupted;
• and
• a control section that performs, if the interruption of the external power source is detected, a control to reduce a power consumption of the device main body and control to drive the shutter so that the shutter is closed by the power supplied from the electricity storage section.