Invention Grant
- Patent Title: Optical film, polarizing plate equipped with the optical film, process for manufacture of the polarizing plate, and liquid crystal display device
- Patent Title (中): 光学膜，配有光学膜的偏光板，偏光板的制造方法以及液晶显示装置
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Application No.: US13978795Application Date: 2011-12-26
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Publication No.: US09223070B2Publication Date: 2015-12-29
- Inventor: Yasuhiro Watanabe , Ayako Inagaki
- Applicant: Yasuhiro Watanabe , Ayako Inagaki
- Applicant Address: JP Tokyo
- Assignee: KONICA MINOLTA, INC.
- Current Assignee: KONICA MINOLTA, INC.
- Current Assignee Address: JP Tokyo
- Agency: Lucas & Mercanti, LLP
- Priority: JP2011-002793 20110111
- International Application: PCT/JP2011/079984 WO 20111226
- International Announcement: WO2012/096118 WO 20120719
- Main IPC: G02F1/13363
- IPC: G02F1/13363 ; G02B5/30 ; G02B1/04
Abstract:
Provided is an optical film which does not undergo the deterioration in front contrast or contrast fluctuations even when used in a VA-type liquid crystal display device having high front contrast or as a polarizing plate protection film. The optical film comprises a cellulose ester resin having high stretching adequacy and having an average acetyl group substitution degree of 2.0-2.6, has a phase difference (Ro) of 30-100 nm, a phase difference (Rth) of 70-400 nm and a film thickness of 15-50 μm, and is characterized by fulfilling a requirement represented by formula (I). Formula (I): 0.01
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