Optical layout for a three light valve full-color projector employing a dual relay lens system and a single projection lens
First Claim
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1. A liquid crystal light valve image projection system comprising:
- (a) an illumination source for providing unpolarized white light;
(b) polarizing means disposed in the path of said unpolarized light, said polarizing means including a prepolarizer for transmitting light of a first polarization and reflecting light of a second polarization away from the optical path of the transmitted light of said first polarization, said polarizing means further including a polarizer/analyzer for reflecting light of said first polarization and transmitting light of said second polarization, said polarizer/analyzer being disposed in the optical path of the transmitted light from said prepolarizer;
(c) relay lens means for relaying images along the optical path of said image projection system;
(d) projection optics for projecting image data; and
(e) light valve means disposed in the optical path of the polarized light that is reflected by said polarizer/analyzer, said light valve means modulating the polarization state of the light reflected by said polarizer analyzer and reflecting polarization-modulated light back along the optical path of the polarized light that is reflected by said polarizer/analyzer, said polarization-modulated light that is reflected by said light valve being being passed by said polarization/analyzer to said projection optics.
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Abstract
A liquid crystal light valve projector is disclosed which includes source illumination appratus which images an illumination aperture at the liquid crystal light valves, and further includes light valve imaging apparatus for relaying the light valve images to a wide angle projection lens having a short back focal length. The disclosed liquid crystal light valve projector utilizes air separated dichroic color separator for providing primary color illumination to the light valves.
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Citations
12 Claims
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1. A liquid crystal light valve image projection system comprising:
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(a) an illumination source for providing unpolarized white light; (b) polarizing means disposed in the path of said unpolarized light, said polarizing means including a prepolarizer for transmitting light of a first polarization and reflecting light of a second polarization away from the optical path of the transmitted light of said first polarization, said polarizing means further including a polarizer/analyzer for reflecting light of said first polarization and transmitting light of said second polarization, said polarizer/analyzer being disposed in the optical path of the transmitted light from said prepolarizer; (c) relay lens means for relaying images along the optical path of said image projection system; (d) projection optics for projecting image data; and (e) light valve means disposed in the optical path of the polarized light that is reflected by said polarizer/analyzer, said light valve means modulating the polarization state of the light reflected by said polarizer analyzer and reflecting polarization-modulated light back along the optical path of the polarized light that is reflected by said polarizer/analyzer, said polarization-modulated light that is reflected by said light valve being being passed by said polarization/analyzer to said projection optics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification