Projection type display device

Details Projection type display device Projection type display device

1997-05-07

1999-07-06

Dowling, William

Optics: image projectors

Polarizer or interference filter

353122, 353 34, 349 8, G03B 2128

Patent

active

059189614

ABSTRACT:
A color projection display device separates light into the colors of red, green and blue. Each of the color components is modulated, superimposed with the other components again and projected. The device provides color picture images with few irregularities in illumination intensity. Polarizing beam splitters used for modulation of the colors are constructed from base materials having a minimum absolute photoelasticity constant value at different wavelengths. Thus, the absolute photoelasticity constant value of the base material for a particular wavelength of light that is separated by the polarizing beam splitter can be made small and double refractions, resulting from stress, are unlikely to occur in any of the components. As a result, a disturbance in the polarization and separation performance is unlikely to occur, and irregularities in the illumination intensity can be reduced.

REFERENCES:
patent: 4425028 (1984-01-01), Gagnon et al.
patent: 4461542 (1984-07-01), Gagnon
patent: 4464019 (1984-08-01), Gagnon
patent: 4544237 (1985-10-01), Gagnon
patent: 4715684 (1987-12-01), Gagnon
patent: 5327270 (1994-07-01), Miyatake
patent: 5575548 (1996-11-01), Lee
patent: 5653520 (1997-08-01), Kato

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