Image projector with optimized luminous efficiency

Details Image projector with optimized luminous efficiency Image projector with optimized luminous efficiency

1992-07-31

1993-12-21

Cuchlinski, Jr., William A.

Optics: image projectors

Composite projected image

Plural projection paths with single light source

353 20, 353 31, 359 40, G03B 2114

Patent

active

052724964

ABSTRACT:
Disclosed is an image projector wherein the illumination of an LCD matrix screen is done by means of two polarized beams coming from a same light beam that has no particular direction of polarization. The two polarized beams are obtained by a polarization separator whence these two polarized beams emerge with a square section. On the one hand, each polarized beam goes through at least two juxtaposed convergent lenses by which it is converted into two sub-beams which project their illumination spot on the matrix screen and, on the other hand, each convergent lens has a surface with a shape that is homothetic with the shape of the matrix screen. The luminous efficiency is thus improved through the matching of the shape of the section of the non-polarized light beam with that of the matrix screen.

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Fourth International Colloquium on Advanced Television Systems, Jun. 25-29, 1990, R. Gerhard-Multhsaupt: "Evolution de la Technologie des Modulateurs de Lumiere pour la TVHD", pp. 1-15.

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