| 摘要 |
A projection display apparatus of the present invention can include a light source; an optical modulator, configured to repeatedly output a modulation beam N times in a predetermined time range, the modulation beam being generated by identically modulating a bema of light emitted from the light source and N being a nature number and equal to or greater than 2; a mirror, configured to reflect the modulation beam, which is repeatedly outputted N times, to scan the modulation beam to an identical point of a screen; and a polarization rotating unit, configured to rotate a polarization direction of the modulation beam for each time the modulation beam is scanned. With the present invention, the speckle noises on a video scanned to a screen can be suppressed.
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