摘要 |
<P>PROBLEM TO BE SOLVED: To provide a projection display device so constituted as to shift a life period of each of a plurality of light sources. <P>SOLUTION: The projection display device includes: a plurality of light sources; a plurality of light sources for supplying power to the plurality of light source power supplies; and a lighting control means for controlling the plurality of light source power supplies to select and light at least one light source from the plurality of light sources in accordance with a lighting history of each of the plurality of light sources. The lighting control means lights one prescribed light source continuously after the lighting history of any one of the plurality of light sources reaches a prescribed defined value. After the lighting history of the one prescribed light source reaches a prescribed life defined value, it lights a light source other than the prescribed one light source. <P>COPYRIGHT: (C)2011,JPO&INPIT |