Inverse wavelength dispersion retardation film and display device including the same
US9645444B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2014 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | Mar 2, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retardation film including: a first optical anisotropic layer including a polymer material; and a second optical anisotropic layer including a liquid crystal material, in which the first optical anisotropic layer has refractive indices which satisfy the following inequation: nz1≧nx1>ny1, the second optical anisotropic layer has refractive indices which satisfy the following inequation: nx2>ny2≧nz2, a fast axis of the first optical anisotropic layer and a slow axis of the second optical anisotropic layer form a predetermined angle such that refractive indices of the retardation film satisfy the following inequation: 0<(nx0−nz0)/(nx0−ny0)<1, and in-plane retardation values (Re0) of the retardation film respectively at a wavelength of about 450 nanometers, 550 nanometers and 650 nanometers satisfy the following inequation: Re0 (450 nm)<Re0 (550 nm)<Re0 (650 nm).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.