Image projection apparatus and image projection system

Details Image projection apparatus and image projection system Image projection apparatus and image projection system

2007-05-08

2007-05-08

Perkey, W. B. (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S020000, C348S752000, C349S009000

Reexamination Certificate

active

10945765

ABSTRACT:
The image projection apparatus includes a first, a second and a third reflective liquid crystal display element, an illumination optical system which color-separates light from a light source into first, second and third color light component and illuminating the three reflective liquid crystal display elements with the respective color light components, a projection optical system combining the color light components emerged from the three reflective liquid crystal display elements and projecting the combined color light components onto a projection surface, and an incidence side polarizing plate arranged between the light source and at least one of the three reflective liquid crystal display elements. An average value of a transmittance, in a wavelength region of 450 nm to 630 nm, of the incidence side polarizing plate for light of a polarization direction to be blocked thereby is 5% or less.

REFERENCES:
patent: 5321448 (1994-06-01), Ogawa
patent: 2001/0040652 (2001-11-01), Hayashi
patent: 2002/0140905 (2002-10-01), Ouchi et al.
patent: 2003/0081313 (2003-05-01), Hiraishi et al.
patent: 2001-154268 (2001-06-01), None

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