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:
Jul. 03, 2007
Filed:
Dec. 13, 2004
Koji Hirata, Yokohama, JP;
Tsutomu Nakashima, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a projection type image display device capable of affording a bright display of a high saturation and capable of ensuring a high reliability of optical parts. The projection type image display device is provided with a color synthesizer for color-synthesizing modulated and polarized light of red light, green light, and blue light, outputted from an image display element. The color synthesizer has an optical characteristic such that the transmittance including reflection by a reflecting film in the interior of the color synthesizer becomes highest for the polarized light of blue light out of the modulated and polarized light of red light, that of green light, and that of blue light. The color synthesizer also has an optical characteristic such that the quantity of the polarized light of blue light outputted becomes largest out of the modulated and polarized light of red light, green light, and blue light.