Optics: image projectors – Composite projected image – Multicolor picture
Patent
1989-06-07
1990-03-27
Cuchlinski, Jr., William A.
Optics: image projectors
Composite projected image
Multicolor picture
353 34, 350337, G02F 113
Patent
active
049115472
ABSTRACT:
An optical system is disclosed which includes a first color selective prepolarizer 16 for separating light from a source into first and second beams. The first beam consists of light of a first color having a first polarization state, and the second beam consists of light of second and third colors having a first polarization state, and light of the first, second and third colors having a second polarization state. A second color selective prepolarizer 22 is provided for separating the second beam into third and fourth beams. The third beam consists of light of the second and third colors having the second polarization state. The fourth beam consists of light of the first color having the second polarization state and light of the second and third colors having the first polarization state. A main polarizer/analyzer 30 is included for separating the fourth beam into fifth and sixth beams. The fifth beam consists of light of the first color having the second polarization state and the sixth beam consists of light of the second and third colors having the first polarization state. A dichroic separator 42 is provided for separating the sixth beam into seventh and eighth beams. The seventh beam consists of light of the second color having the first polarization state and the eighth beam consists of light of the third color having the first polarization state. The invention directs the fifth, seventh and eighth beams, consisting of green, red and blue light respectively in parallel relation toward a single light valve. Polarization modulated light is returned from the light valve for full color projection.
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Cuchlinski Jr. William A.
Denson-Low Wanda K.
Dowling William C.
Hughes Aircraft Company
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