Invention Grant
- Patent Title: Circular polarizing plate, wideband lambda/4 plate, and organic electroluminescence display device
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Application No.: US15511641Application Date: 2015-09-10
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Publication No.: US10254459B2Publication Date: 2019-04-09
- Inventor: Taku Hatano , Kazuhiro Oosato
- Applicant: ZEON CORPORATION
- Applicant Address: JP Chiyoda-ku, Tokyo
- Assignee: ZEON CORPORATION
- Current Assignee: ZEON CORPORATION
- Current Assignee Address: JP Chiyoda-ku, Tokyo
- Agency: Kenja IP Law PC
- Priority: JP2014-189301 20140917
- International Application: PCT/JP2015/075757 WO 20150910
- International Announcement: WO2016/043124 WO 20160324
- Main IPC: G02B5/30
- IPC: G02B5/30 ; G02B27/28 ; H01L51/52 ; G02B1/08

Abstract:
A circularly polarizing plate includes: a polarizing film; a λ/2 plate having a slow axis in a direction forming an angle of 15°±5° with respect to an absorption axis of the polarizing film; and a λ/4 plate having a slow axis in a direction forming an angle of 75°±5° with respect to the absorption axis of the polarizing film, which are provided in this order. A wavelength dispersion of the λ/2 plate and a wavelength dispersion of the λ/4 plate approximately coincide with each other. A refractive index of one of the λ/2 plate and the λ/4 plate is nz≥nx>ny, and a refractive index of the other of the λ/2 plate and the λ/4 plate is nx>ny≥nz, where nx, ny and nz represent refractive indices in in-plane slow axis, in-plane fast axis, and thickness directions, respectively.
Public/Granted literature
- US20170261668A1 CIRCULAR POLARIZING PLATE, WIDEBAND LAMBDA/4 PLATE, AND ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE Public/Granted day:2017-09-14
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