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:
Sep. 10, 2013
Filed:
Dec. 23, 2009
Satoru Hamada, Tokyo-to, JP;
Keiji Kashima, Tokyo-to, JP;
Takashi Kuroda, Tokyo-to, JP;
Hirofumi Yumoto, Tokyo-to, JP;
Satoru Hamada, Tokyo-to, JP;
Keiji Kashima, Tokyo-to, JP;
Takashi Kuroda, Tokyo-to, JP;
Hirofumi Yumoto, Tokyo-to, JP;
Dai Nippon Printing Co., Ltd., Tokyo-to, JP;
Abstract
A main object of the present invention is to provide a rotating plate hardly generating variation in the rotation angle of the liner polarization so as to easily realize a desired rotation angle, and a liquid crystal display device enabling observation of a bright image by use thereof even in a state with a polarizing glasses put on. To attain the object, the present invention provides an optical rotation plate comprising a transparent substrate, and an optical rotation layer formed on the transparent substrate and containing a rod-shaped compound for forming a cholesteric structure and having a function of rotating transmitted liner polarization, wherein the cholesteric structure has a 90 degrees or larger twist angle and a pitch in a range of 450 nm to 4,000 nm.