Projector with reduced size and higher contrast

Details Projector with reduced size and higher contrast Projector with reduced size and higher contrast

2009-03-05

2011-11-08

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Prism in light path

C353S098000, C353S099000, C348S771000, C348S337000

Reexamination Certificate

active

08052284

ABSTRACT:
A projector with reduced size and higher contrast includes a prism assembly, a light system, and a Digital Micro-mirror Device (DMD). Only In the “ON” state of DMD, the light from the light system reflects to a projection screen through the prism assembly and the DMD. The prism assembly includes two prisms and a medium layer. The prism assembly is appropriately designed so as to disable the light in the “OFF” state from reflecting to the projection screen by two-time total internal reflection in the prism assembly, and also to reduce the size of the projector.

REFERENCES:
patent: 6185047 (2001-02-01), Peterson et al.
patent: 6250763 (2001-06-01), Fielding et al.
patent: 6560048 (2003-05-01), Okamori et al.
patent: 6663243 (2003-12-01), Fielding et al.
patent: 7207678 (2007-04-01), Penn
patent: 7210788 (2007-05-01), Lee et al.
patent: 1580866 (2005-02-01), None
patent: 2001166255 (2001-06-01), None
patent: 2007256680 (2007-10-01), None

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