Projection system with folded optical path

Details Projection system with folded optical path Projection system with folded optical path

2005-02-22

2005-02-22

Yenke, Brian P. (Department: 2614)

Television

Video display

Projection device

C348S745000, C348S756000, C348S759000, C348S780000, C348S782000, C353S038000, C353S084000, C353S098000

Reexamination Certificate

active

06859239

ABSTRACT:
A high throughput, compact image display apparatus comprises a source unit to generate a spatially uniform light beam that propagates along a first beam path in a first direction. The image display apparatus also comprises an imaging unit to collect and focus the light beam. The imaging unit includes a first refractive optical element disposed in the first beam path, a second refractive optical element disposed in the first beam path, a first reflecting mirror disposed in the first beam path, and a second reflecting mirror, having a concave reflecting surface, disposed in a second beam path defined by the first reflecting mirror and the second reflecting mirror. The second beam path is oriented in a second direction different from the first direction. The image display apparatus also comprises a digital micromirror device (“DMD”) to receive the light beam reflected by the second reflecting mirror. The DMD is disposed in a third beam path defined by the second reflecting mirror and the DMD. The third beam path is oriented in a third direction different from the second direction. The image display apparatus also includes a projection lens to collect and project the light beam reflected from the DMD. The projection lens is disposed in a fourth beam path defined by the DMD and the projection lens, that is oriented in a fourth direction different from the third direction.

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