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:
Oct. 21, 2008
Filed:
Nov. 18, 2005
Hiroki Yoshikawa, Hiratsuka, JP;
Tetsu Ohishi, Hiratsuka, JP;
Daisuke Imafuku, Fujisawa, JP;
Koji Hirata, Yokohama, JP;
Hiroki Yoshikawa, Hiratsuka, JP;
Tetsu Ohishi, Hiratsuka, JP;
Daisuke Imafuku, Fujisawa, JP;
Koji Hirata, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a technology suitable for shortening a depth of a image display apparatus while obtaining a picture of high quality. According to the invention, a total reflection prism portion is provided on a side of a Fresnel lens sheet toward a picture source. The total reflection prism portion reflects an incident light to a direction toward an optic axial center of the Fresnel lens sheet to have the same outgoing. On the other hand, a first refractive prism portion, by which light of a predetermined incident angle or less is refracted to outgo to a direction along an optical axis of the Fresnel lens sheet, and a second refractive prism portion, by which light reflected to the direction toward the optic axial center of the Fresnel lens sheet is changed to the direction along the optical axis.