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:
Apr. 22, 2008
Filed:
Dec. 16, 2004
Hiroki Yoshikawa, Hiratsuka, JP;
Tetsu Ohishi, Hiratsuka, JP;
Koji Hirata, Yokohama, JP;
Daisuke Imafuku, Fujisawa, JP;
Hiroki Yoshikawa, Hiratsuka, JP;
Tetsu Ohishi, Hiratsuka, JP;
Koji Hirata, Yokohama, JP;
Daisuke Imafuku, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a technology that makes it possible to display high-quality images by reducing a reflection loss of the image light entering the upper left and right ends of a transmissive screen. At the image generation source side of the Fresnel lens sheet, a totally reflective prism section () is provided that totally reflects incident rays of light and causes the light to exit toward the image-watching side. At the image-watching side of the Fresnel lens sheet (), a refractive prism section () is also provided that refracts the light entering from the totally reflective prism section () and causes the light to exit toward the image-watching side. The refractive prism section () has a roughed refractive face.