Title:
OPTICAL BIAXIALLY STRETCHED PLASTIC FILM, POLARIZING PLATE, IMAGE DISPLAY DEVICE, AND METHOD OF SELECTING OPTICAL BIAXIALLY STRETCHED PLASTIC FILM
Document Type and Number:
WIPO Patent Application WO/2021/065967
Kind Code:
A1
Abstract:
Provided are an optical biaxially stretched plastic film, a polarizing plate, and an image display device that can suppress blackout when visually recognized with polarized sunglasses or polarized goggles without increasing an in-plane phase difference, and provided is a method of selecting an optical biaxially stretched plastic film. The optical biaxially stretched plastic film has an area satisfying the following conditions 1 and 2. The difference (L1.n-L2.n) between the brightness obtained in specific measurement 1 and the brightness obtained in specific measurement 2 is calculated at 100 measurement points, and a "variation of brightness difference 3σ" calculated from the brightness differences of the 100 measurement points is 100 or more. The in-plane phase difference (Re) is 2500 nm or less.
Inventors:
TANAKA YOSHIKO (JP)
KUBOTA SHOSEI (JP)
ISHII NORIO (JP)
KURODA TAKASHI (JP)
SEGAWA HIROAKI (JP)
USHIYAMA AKINOBU (JP)
KUBOTA SHOSEI (JP)
ISHII NORIO (JP)
KURODA TAKASHI (JP)
SEGAWA HIROAKI (JP)
USHIYAMA AKINOBU (JP)
Application Number:
PCT/JP2020/037050
Publication Date:
April 08, 2021
Filing Date:
September 30, 2020
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G02B5/30; B32B7/023; H01L27/32; H01L51/50; H05B33/02
Domestic Patent References:
| WO2018143569A1 | 2018-08-09 |
Foreign References:
| JP2011112928A | 2011-06-09 | |||
| JP2019518241A | 2019-06-27 | |||
| US20190154884A1 | 2019-05-23 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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