Polarizer protective film, polarization plate comprising same, and optical display apparatus comprising same
US12372689B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2020 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Jun 27, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3033
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A protective film for polarizers, a polarizing plate including the same, and an optical display apparatus including the same. The polyester-based film is a polyester protective film, has a thickness of about 10 μm to about 50 μm and a refractive index difference (nx−ny) of about 0.01 or more (nx and ny being indexes of refraction of the protective film at a wavelength of about 550 nm in the slow axis direction and the fast axis direction of the protective film, respectively), and is a biaxially stretched film. The slow axis direction of the protective film is coincident with a transverse direction (TD) thereof and an angle of about 70° to about 90° is defined between an external optical axis of the protective film and a normal direction with respect to an in-plane direction of the protective film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.