Retardation film
US11002896B2 · kind B2 · utility
0Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2016 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Feb 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/086
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a retardation film which shows a high light selective absorbency to visible rays having short wavelengths near 400 nm to have a high light resistance, and which can give, when used in a display device, good display properties to the display device. This film is a retardation film, satisfying all of the following formulae (1) to (4): 2≤A(380) (1), 0.5≤A(400) (2), 0.4≥A(420)/A(400) (3), and 100 nm≤Re(550)≤170 nm (4), in which each A(λ) represents the absorbance of the film at a wavelength λ nm, and Re (550) represents the in-plane retardation value of the film to a light ray having a wavelength of 550 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.