Speckle minimization in projection displays by reducing...

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

G - Physics

02

B

88/114, 88/46

G02B 27/18 (2006.01) G02B 27/48 (2006.01) G03B 21/14 (2006.01)

Patent

CA 1064746

SPECKLE MINIMIZATION IN PROJECTION DISPLAYS BY REDUCING SPATIAL COHERENCE OF THE IMAGE LIGHT ABSTRACT OF THE DISCLOSURE 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.

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