Projection display system

Details Projection display system Projection display system

2008-04-01

2008-04-01

Blackman, Rochelle (Department: 2862)

Optics: image projectors

Prism in light path

C353S020000, C353S033000, C353S037000, C353S099000, C353S102000, C359S490020, C359S638000, C359S640000, C359S641000, C359S720000, C359S833000, C359S837000, C348S759000

Reexamination Certificate

active

11262924

ABSTRACT:
A projection display system comprises an illumination device, a prism assembly, a projection lens and a reflective light valve. The prism assembly has a first light incident surface, a first light emitting surface and a second light emitting surface. The first light emitting surface is an optical curved surface. An illumination beam is incident on the light valve after it enters the prism assembly from the first light incident surface. A modulated beam is generated after it is processed through the light valve. Finally, the modulated beam is projected into the projection lens through the prism assembly. Because a surface of the prism assembly is set to be an optical curved surface to replace a lens in the projection lens or the illumination device, a back focal length of the system is shortened and the projection lens or the illumination device is simplified.

REFERENCES:
patent: 5309188 (1994-05-01), Burstyn
patent: 5552922 (1996-09-01), Magarill
patent: 6672724 (2004-01-01), Peterson et al.
patent: 6719426 (2004-04-01), Magarill et al.
patent: 2003/0123162 (2003-07-01), Penn

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