| 摘要 |
PROBLEM TO BE SOLVED: To provide a video projector capable of shortening the interruption time of a video display. SOLUTION: The video projector 100 is provided with light source parts 5 and 6, moving mechanisms 10 and 12 for moving respective light source parts 5 and 6 to standby positions 18 and 11, or an irradiation position 9, an optical sensor, and an optical unit for covering the optical sensor, and in the case the intensity of light arriving at the optical sensor 40 after being emitted from the light source part 5 placed in the irradiation position 9 and reflected by a liquid crystal panel 3 in a non-display state is lower than a prescribed reference value, the light source part 5 is moved to the standby position 8 near the replacing port 47 of a housing 45, and the spare light source part 6 in an on-state is moved to the irradiation position 9.
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