Invention Grant
- Patent Title: Polarizing plate, method for producing polarizing plate, and liquid crystal display device
- Patent Title (中): 偏光板,偏光板的制造方法以及液晶显示装置
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Application No.: US13258370Application Date: 2010-04-26
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Publication No.: US08691353B2Publication Date: 2014-04-08
- Inventor: Takahiro Takagi
- Applicant: Takahiro Takagi
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Holtz Holtz Goodman & Chick, PC
- Priority: JP2009-107562 20090427; WOPCT/JP2010/050330 20100114
- International Application: PCT/JP2010/057348 WO 20100426
- International Announcement: WO2010/125997 WO 20101104
- Main IPC: G02F1/1335
- IPC: G02F1/1335 ; G02F1/13363 ; G02B5/30

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.
Public/Granted literature
- US20120013828A1 POLARIZING PLATE, METHOD FOR PRODUCING POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE Public/Granted day:2012-01-19
Information query
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