Patent ID: 7290903

Claim:
A projection display comprising: a housing; a display panel installed on the housing; a power plug installed outside the housing for electrically connecting to an external power source for receiving power provided by the external power source; a light source installed in the housing and electrically connected to the power plug for emitting light onto the display panel when receiving power from the power plug; a heat-ventilating device installed in the housing for ventilating heat generated by the power source to a region outside of the housing when receiving power; a power storage device for storing power; a power detector electrically connected to the heat-ventilating device, the power storage device, and the power plug for selectively electrically connecting the heat-ventilating device either to the power plug or to the power storage device according to a voltage level of the power; and a light source switch for turning off the light source before the heat-ventilating device is connected to the power storage device, for providing power stored in the power storage device to the heat-ventilating device while the light source is turned off.