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:
Aug. 05, 2003
Filed:
Sep. 17, 2001
Yasunori Ogawa, Suwa, JP;
Nobuo Watanabe, Shiojiri, JP;
Hiromi Saito, Chino, JP;
Shigeo Toda, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An optical modulation device is presented having a distance Wp from the end of an opposite substrate to the inner peripheral edge of a cover portion in a frame being set to be smaller than the distance W from the end of the opposite substrate to the inner peripheral edge of a first light-shielding portion (Wp<W ). Therefore, there is no fear that incident light from outside of the inner peripheral edge of the cover portion may be blocked by the cover portion, so that incident light may reliably enter the entire image area. This arrangement makes it possible to prevent the peripheral portion of a projection image from becoming dark, and thereby improve the quality of the projection image.