PROJECTION DISPLAY AND SPECKLE REDUCTION ELEMENT

摘要

A projection display which is miniaturized, enhances reliability and reduces speckle noise. A blue laser (1), a red laser (2) and a green laser (3) emit blue laser light, red laser light and green laser light, respectively, a spatial light modulation element (14) modulates blue laser light, red laser light and green laser light emitted from the blue laser (1), a red laser (2) and a green laser (3), a projection lens (15) projects light modulated by the spatial light modulation element (14) to a screen, and first and second diffusion elements (8, 9), arranged along the optical axis between the spatial light modulation element (14) and the blue laser (1), the red laser (2) and the green laser (3), varies the degrees of diffusion of the blue laser light, red laser light and green laser light temporally and electrically.