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:
Jan. 16, 2018
Filed:
Mar. 10, 2015
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Keiji Kashima, Tokyo, JP;
Yasuki Suzuura, Tokyo, JP;
Hiroshi Yamamoto, Tokyo, JP;
Takashi Kuroda, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
Sufficiently sharp directivity can be secured with a simple configuration in a configuration that improves the efficiency of utilizing the light exiting from a primary light source using a reflective polarizing plate. A backlight unit () supplies light exiting from an exit surface of a light guide plate () to a liquid-crystal display panel () via a reflective polarizing plate () after correcting directivity of the exiting light using a prism sheet () having a downwardly convex shape. A ¼-wavelength plate () is provided between the prism sheet () and the reflective polarizing plate (), between the prism sheet () and the light guide plate, or between the light guide plate and a reflective sheet disposed on a surface of the light guide plate opposite to the prism sheet ().