Optical system for a thin, low-chin, projection television

Details Optical system for a thin, low-chin, projection television Optical system for a thin, low-chin, projection television

2011-06-28

2011-06-28

Ko, Tony (Department: 2878)

Optics: image projectors

Cabinet encloses projector and one side of screen

Reflector between lamp and screen

C353S078000, C353S099000, C359S651000

Reexamination Certificate

active

07967448

ABSTRACT:
A micro-mirror based projection display system in an enclosure with minimum chin and depth measurements is disclosed. A light source, such as a solid state laser light source, generates light of multiple primary colors that is modulated by a digital micro-mirror device. The projection optics of the system include a telecentric rear group of glass lenses with spherical surfaces, followed by a pair of aspheric lenses formed of plastic. A folding mirror, such as a single-piece or multi-piece angular mirror, is disposed between the aspheric lenses, to reduce the depth of the enclosure, and an aspheric mirror projects the image onto a TIR Fresnel projection screen. The aspheric lenses are magnifying to reduce the magnification required of the aspheric mirror, and the aspheric lenses and mirror are clipped to reduce enclosure volume. A folding mirror may be used after the aspheric mirror to further reduce the depth of the enclosure.

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