Retardation film, circularly-polarizing plate, and image-displaying device
US10670773B2 · kind B2 · utility
1Cited by
6References
16Claims
0Family size
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Key dates
| Filing date | Oct 14, 2016 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | Nov 16, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/305
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The retardation film of the present invention contains a thermoplastic resin and is constituted of a single layer. A value of wavelength dispersion (R450/R550) that is a ratio of a retardation R450 at a wavelength of 450 nm and a retardation R550 at a wavelength of 550 nm is 0.70 or more and 0.85 or less; and a photoelastic coefficient is 14×10−12 Pa−1 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.