Projection display device, and speckle reduction element

Details Projection display device, and speckle reduction element Projection display device, and speckle reduction element

2011-08-16

2011-08-16

Dowling, William C (Department: 2878)

Optics: image projectors

Structurally related projector and screen

C349S193000, C353S122000

Reexamination Certificate

active

07997737

ABSTRACT:
A projection display device enhances reliability and reduces speckle noise. A blue laser, a red laser, and a green laser emit blue laser light, red laser light, and green laser light, respectively. A spatial light modulation element modulates the blue laser light emitted from the blue laser, the red laser light emitted from the red laser, and the green laser light emitted from the green laser. A projection lens projects the laser light modulated by the spatial light modulation element onto a screen. First and second light diffusing elements are arranged on an optical axis between the blue laser, the red laser, and the green laser, and the spatial light modulation element to change the degree of diffusion of the blue laser light, the red laser light, and the green laser light temporally and electrically.

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