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:
Nov. 18, 2003
Filed:
Aug. 30, 2002
Masao Katsumata, Tokyo, JP;
Hideki Yamamoto, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
A projection apparatus is disclosed which uses a light modulation element of the reflection type and can demultiplex and multiplex light appropriately. The projection apparatus includes four PBSs including an incoming PBS, a RB-PBS, a G-PBS and an outgoing PBS to demultiplex illumination light emitted from a lamp into light components in wavelength bands of blue, red and green. The illumination light in the wavelength band of green is introduced to a position at which the highest contrast is obtained, and a third liquid crystal panel is disposed at the position. The illumination light in the wavelength band of red is introduced to another position at which the second highest contrast is obtained, and a second liquid crystal panel is disposed at the position. The illumination light in the wavelength band of blue is introduced to the remaining position, and a first liquid crystal panel is disposed at the position. Reflected light components in the wavelength bands modulated by the individual liquid crystal panels are multiplexed and then projected in an enlarged scale through a projection lens.