Illumination device and method for laser projector

Details Illumination device and method for laser projector Illumination device and method for laser projector

2005-03-22

2005-03-22

Boutsikaris, Leo (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S020000, C359S599000

Reexamination Certificate

active

06870650

ABSTRACT:
Systems and methods for providing illumination suitable for imaging devices such as laser projection systems. In one embodiment, a highly collimated (e.g., laser light) beam is passed through a holographic diffuser to create a well defined cone angle for the light emanating from each point on the diffuser. This light is focused into an illumination image that is controlled by the prescription of the diffuser. In one embodiment, the image is a uniformly intense rectangle having a 4:3 aspect ratio to match an imager for a projection display. The diffuser prescription and resulting illumination image can be selected to match any desired imager. The present systems and methods may provide the advantages of high level of light efficiency, reduction or elimination of speckle and “worminess” and reduction or elimination of cosine4and gaussian intensity falloff, all of which are common in prior art designs.

REFERENCES:
patent: 5757544 (1998-05-01), Tabata et al.
patent: 6369779 (2002-04-01), Bartlett
patent: 6606173 (2003-08-01), Kappel et al.
patent: 6714328 (2004-03-01), Steiner

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