Projection display apparatus

Details Projection display apparatus Projection display apparatus

2006-11-07

2006-11-07

Perkey, W. B. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S031000, C353S033000, C353S034000, C353S037000, C353S081000, C353S082000, C349S009000, C349S096000, C248S057000, C248S057000, C248S057000, C359S490020, C359S629000

Reexamination Certificate

active

07131729

ABSTRACT:
A projection display apparatus that is lightweight and provides bright, high quality images is provided. The projection display apparatus comprising a color separation and synthesis optical system4, that performs color synthesis, generating an image, after separating light of the three primary colors of determined polarities into the respective three colors, and modulating those three color lights in relation to respective image signals therefor, and a projection lens106. The color separation and synthesis optical system4comprises polarized light separating means8, 9, 11and16disposed in respective diagonal directions therein and reflecting spatial light modulating elements12, 13and14disposed to perform light modulation coordinated to an image signal for each respective color, for light separated according to polarization by the four polarized light separating means8, 9, 11. Three spatial light modulating elements12, 13and14are disposed on the outer side of the polarized light separating means9, 11and16, other than the polarized light separating means8, that is disposed on that side of incident light, at least two from among the four polarized light separating means8, 9, 11and16are wire grid polarized light separating plates and an astigmatism correcting lens21is provided between the polarized light separating means16disposed on that side at which projection is performed and at least one of the spatial light modulating elements.

REFERENCES:
patent: 6234634 (2001-05-01), Hansen et al.
patent: 6873469 (2005-03-01), De Vaan et al.
patent: 2002/0154420 (2002-10-01), Magarill et al.
patent: 2002/0180932 (2002-12-01), Shimizu et al.
patent: 2001-174755 (2001-06-01), None
patent: 2002-372749 (2002-12-01), None

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