Prism for high contrast projection

Details Prism for high contrast projection Prism for high contrast projection

2005-11-01

2005-11-01

Dowling, William C. (Department: 2851)

Optics: image projectors

Prism in light path

C348S771000, C359S834000

Reexamination Certificate

active

06959990

ABSTRACT:
Prism elements having TIR surfaces placed in close proximity to the active area of a SLM device302to separate unwanted off-state324and/or flat-state326light from the projection ON-light bundle322. The TIR critical angle of these prisms is selected to affect either the off-state light or additionally, any portion of flat-state light reflected from the SLM. These TIR surfaces are placed to immediately reflect the unwanted light as it comes off the SLM, thereby preventing the contamination of light along the projection path, which tends to degrade the system contrast. To further improve the optical performance of the system, these TIR prisms can be attached directly to the SLM package300, completely eliminating the package window. Also, these TIR prism can be coupled to DMDs having asymmetric mirrors, which tilt through a larger angle for the ON-light to provide high etendue and lumen output, but through near-zero degrees for the OFF-light, thereby improving the separation of any unwanted light from the off/flat states.

REFERENCES:
patent: 5552922 (1996-09-01), Magarill
patent: 6250763 (2001-06-01), Fielding et al.
patent: 6549338 (2003-04-01), Wolverton et al.
patent: 6560048 (2003-05-01), Okamori et al.
patent: 6726332 (2004-04-01), Cannon et al.

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