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. 08, 2014
Filed:
Apr. 26, 2010
Takahiro Takagi, Sagamihara, JP;
Takahiro Takagi, Sagamihara, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
Disclosed are: a polarizing plate having visibility and viewing angle characteristics; and a liquid crystal display device using the polarizing plate. Specifically disclosed is a polarizing plate which is obtained by sandwiching a polarizer between first and second cellulose ester films. The polarizing plate is characterized in that the first cellulose ester film is formed from a cellulose ester having a total degree of substitution of acyl groups of 2.8-3.0, and the second cellulose ester film is formed from a cellulose ester having a total degree of substitution of acyl groups of 2.0-2.6, and has a retardation value Ro of 30-200 nm and a retardation value Rt of 70-300 nm. The polarizing plate is also characterized in that the first and second cellulose ester films are subjected to a saponification treatment wherein when the saponification condition is expressed as a saponification index M, the saponification index M1 of the first cellulose ester film and the saponification index M2 of the second cellulose ester film satisfy the relation of M1>M2.