Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-08-30
1993-09-14
Heyman, John S.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 51, 359 67, 359 71, 359634, 353 31, 353 34, G02F 1133, H04N 931
Patent
active
052454495
ABSTRACT:
A liquid crystal color projection display apparatus having a projection light source, a plurality of liquid crystal display elements for separately modulating lights of a plurality of colors from the projection light source and an optical projection system for projecting light to a projection screen, wherein a liquid crystal and polymer composite put between a pair of substrates each equipped with an electrode is used as the liquid crystal display element, in which a liquid crystal material is dispersed and held in a polymer matrix and the refractive index of the polymer matrix substantially agrees with the ordinary light refractive index (n.sub.o) of the liquid crystal material used, a dichroic mirror is used for color splitting or color synthesis and the dependence of dichroic mirror's spectral characteristics upon the state of polarization is decreased. Clear color images of high purity and excellent hue can be obtained. Size and the cost of the liquid crystal display apparatus can be reduced.
REFERENCES:
patent: 4191456 (1980-03-01), Hong et al.
patent: 4435047 (1984-03-01), Fergason
patent: 4552441 (1985-11-01), Dewey
patent: 4613207 (1986-09-01), Fergason
patent: 4688900 (1987-08-01), Doane et al.
patent: 4693557 (1987-09-01), Fergason
patent: 4715684 (1987-12-01), Gagnon
patent: 4749259 (1988-06-01), Ledebuhr
patent: 4818070 (1989-04-01), Gunjima et al.
patent: 4850685 (1989-07-01), Kamakura et al.
patent: 4864390 (1989-09-01), McKechie et al.
patent: 4904061 (1990-02-01), Aruga
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 4936658 (1990-06-01), Tanaka et al.
patent: 4969732 (1990-11-01), Wright et al.
patent: 5022750 (1991-06-01), Flasck
patent: 5029986 (1991-07-01), De Vaan
patent: 5040877 (1991-08-01), Blinc et al.
patent: 5060058 (1991-10-01), Goldenberg et al.
patent: 5150232 (1992-09-01), Gunkima et al.
Patent Abstracts of Japan, vol. 13, No. 146(P854), Apr. 11, 1989, & JP-A-63-309917, Dec. 19, 1988, F. Yajima, "Projection Type Color Display Device".
Patent Abstracts of Japan, vol. 12, No. 328(E654), Sep. 6, 1988, & JP-A-63-92190, Apr. 22, 1988, T. Atsuta, et al., "Color Television Picture Projector".
Thin-Film Optical Filters, Second edition, H. A. Macleod, Adam Hilgher Ltd, Bristol, pp. 1-26.
Optical Thin Films--User's Handbook, James D. Rancourt, Macmillan Publishing Company.
Gunjima Tomoki
Ooi Yoshiharu
Asahi Glass Company Ltd.
Duong Tai V.
Heyman John S.
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