The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2008
Filed:
Sep. 16, 2005
Atsushi Okuyama, Tokorozawa, JP;
Makoto Takahashi, Utsunomiya, JP;
Atsushi Okuyama, Tokorozawa, JP;
Makoto Takahashi, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image projection apparatus includes a first reflection type liquid crystal display device for modulating and reflecting red light, a second reflection type liquid crystal display device for modulating and reflecting green light, a third reflection type liquid crystal display device for modulating and reflecting blue light, the image projection apparatus projecting colored light made of the red, green and blue lights from the first to third reflection type liquid crystal display devices, a first 1/4 wave plate provided on an optical path of the red light, a second 1/4 wave plate provided on an optical path of the green light, and a third 1/4 wave plate provided on an optical path of the blue light, a direction of a fast axis of the third 1/4 wave plate being different from a direction that minimizes leakage light of the blue light.