LCD projector

Details LCD projector LCD projector

1993-02-22

1994-02-01

Cuchlinski, Jr., William A.

Optics: image projectors

Composite projected image

Plural projection paths with single light source

353 33, 353 37, 353 20, 359 40, 359 48, G02F 113

Patent

active

052836002

ABSTRACT:
An LCD projector for projecting an image displayed on an LCD of the electrooptic-effect type on a projection screen is disclosed. The LCD projector has a polarization beam-splitting optical system which is disposed in the optical path of a projection beam between a light source and the LCD. The optical system has a plurality of optical subsystems and at least one optical rotator. Each optical subsystem has a reflecting device and a polarization beam splitter arrangement provided with a polarization beam-splitting plane arrangement. The polarization beam splitter arrangement and the beam-splitting plane arrangement are arrangements of one or more polarization beam splitters and of one or more polarization beam-splitting planes, respectively. The beam-splitting plane arrangements provided in the plurality of the optical subsystems are disposed in the optical path of the projection beam and oriented with respect to the projection beam so as to define planes of incidence parallel to each other. The reflecting device is made up of one or more reflectors oriented so that the s-polarized component reflected on the polarization beam-splitting plane arrangement is deflected toward a prescribed region of the incidence surface of the LCD. The optical rotator makes parallel the directions of the s- and p-polarized components delivered from the optical system.

REFERENCES:
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 5042921 (1991-08-01), Sato et al.
patent: 5153752 (1992-10-01), Kurematsu et al.
patent: 5172254 (1992-12-01), Atarashi et al.
patent: 5200843 (1993-04-01), Karasawa et al.
Proceedings of Eurodisplay 1990, Report of The Tenth International Display Research Conference, pp. 64 through 67.

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