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:
Jul. 07, 2009
Filed:
Jul. 12, 2007
Ikuo Kawamoto, Ibaraki, JP;
Hideyuki Yonezawa, Ibaraki, JP;
Kazuya Hada, Ibaraki, JP;
Shunsuke Shutou, Ibaraki, JP;
Tsuyoshi Chiba, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Ikuo Kawamoto, Ibaraki, JP;
Hideyuki Yonezawa, Ibaraki, JP;
Kazuya Hada, Ibaraki, JP;
Shunsuke Shutou, Ibaraki, JP;
Tsuyoshi Chiba, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki-Shi, JP;
Abstract
A polarizing plate with optical compensation layers that performs a wide viewing angle compensation with respect to a liquid crystal cell, allows circularly polarized light to be obtained over a wide range of light wavelengths, contributes to the reduction in thickness, prevents thermal irregularity from occurring, and can effectively prevent light leakage from occurring in a black display. The polarizing plate includes a polarizer, a first optical compensation layer, and a second optical compensation layer that are stacked together in this order. The first optical compensation layer is formed of a liquid crystal compound and has a relationship of nx>ny=nz and an in-plane retardation Reof 100 to 170 nm. The second optical compensation layer has a relationship of nx=ny>nz and a thickness direction retardation Rthof 30 to 400 nm. The angle formed between the absorption axis of the polarizer and the slow axis of the first optical compensation layer is in the range of 'plus' or 'minus' 25 to 65 degrees.