Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1997-02-07
1999-09-07
Dang, Hung Xuan
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359276, 359277, 359316, 359318, G02F 103, G02F 101, G02F 129
Patent
active
059495693
ABSTRACT:
A projection display apparatus includes a light source, a spatial light modulation device, a condenser lens, an aperture stop, and a projecting lens. When the spatial period of complex amplitude modulation in the spatial light modulation device is represented by p, the center wavelength of the incident light is represented by .lambda., and a half angle subtended by an area around an opening edge of the aperture stop at the condenser lens along the first direction is represented by .theta.asx, parameters of the light source, the spatial light modulation device, the condenser lens, the screen, the aperture stop and the projecting lens and a relative positional relationship therebetween are defined such that the following condition is satisfied:
REFERENCES:
patent: 3259014 (1966-07-01), Johnson et al.
patent: 4848879 (1989-07-01), Nishimura et al.
Yoshikazu Hori, et al. "Field-Controllable Liquid-Crystal Phase Grating", IEEE Transactions on Electron Devices, vol. ED-26, No. 11, (pp. 1734-1737), Nov., 1979.
M. W. Fritsch. "Schlieren Optical System Using Liquid Crystal Phase Gratings for Large Screen Projection", Displays, vol. 13, No. 1, (pp. 45-60), 1992.
R. Gerhard-Multhaupt, et al. "Viscoelastic Spatial Light Modualtors and Schlieren-Optical Systems for HDTV Projection Displays", Proc. SPIE, vol. 1255, (pp. 69-78), 1990.
Dang Hung Xuan
Kabushiki Kaisha Toshiba
Lester Evelyn A.
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