Reflection-type image projection unit and a reflection-type...

Details Reflection-type image projection unit and a reflection-type... Reflection-type image projection unit and a reflection-type...

2006-06-13

2006-06-13

Perkey, W. B. (Department: 2851)

Optics: image projectors

Prism in light path

C353S033000, C353S020000, C348S756000, C348S757000, C349S009000

Reexamination Certificate

active

07059725

ABSTRACT:
In a reflection-type image projecting unit, being applicable into a reflection-type image display apparatus, being superior in contrast and achieving small-sizing of the apparatus, together with a light source for use therein, a light flux including three (3) color components, R, G and B, emitted from a light source portion100, are modulated and synthesized by means of reflection-type liquid crystal panels221, 222and223in an optical engine200, which is constructed with three (3) prism-like polarization light beam splitters, to be emitted thereform, wherein those three (3) prism-like polarization light beam splitters are so displosed, that the G-component light of the three component lights R, G and B modulated on the reflection-type liquid crystal panel elements penetrates through two (2) of the prism-like polarization light beam splittrers231and232, to be emitted therefrom, while the others, the B-component light and the R-component light penetrate therethrough after being reflected thereupon, or they are reflected after penetrating therethrough, while taking the planes of polarization lights of the propagating lights into the consideration.

REFERENCES:
patent: 6176586 (2001-01-01), Hirose et al.
patent: 6280034 (2001-08-01), Brennesholtz
patent: 6384972 (2002-05-01), Chuang
patent: 6402323 (2002-06-01), Shiue et al.
patent: 6419362 (2002-07-01), Ikeda et al.
patent: 6672722 (2004-01-01), O'Connor et al.

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