Speckle minimization in projection displays by reducing spatial

Details Speckle minimization in projection displays by reducing spatial Speckle minimization in projection displays by reducing spatial

1975-06-25

1977-07-12

Stephan, Steven L.

Optics: image projectors

Miscellaneous

350 9, 350188, G02B 2300, G02B 1320, G03B 2100

Patent

active

040350681

ABSTRACT:
An optical system for minimizing the speckle observed in a projected image, the image being produced by a projection display device. Coherent or non-coherent light illuminates the projection display device image and an image thereof is formed at an intermediate image plane. A narrow angle diffuser is positioned at the intermediate image plane and produces an enlarged illuminating aperture at the Fourier transform plane. The relatively large angle subtended by the illuminating aperture at a second image plane reduces the spatial coherence of the image formed thereat.

REFERENCES:
patent: 1780969 (1930-11-01), Brunner
patent: 3262359 (1966-07-01), Carpenter
patent: 3850515 (1974-11-01), Burch
patent: 3904289 (1975-09-01), Yager
patent: 3941456 (1976-03-01), Schlitz et al.

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