Wide-view optical film having reversed wavelength dispersion
US9939554B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2013 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Jan 24, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24975
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical compensation film is disclosed herein, which is made by uniaxially or biaxially stretching of a multilayer film including a first polymer film having a refractive index profile satisfying the equations of (nx+ny)/2≥nz and |nx−ny|<0.005 and a second polymer film having a refractive index profile satisfying the equations of (nx+ny)/2<nz and |nx−ny|<0.005, wherein nx and ny represent in-plane refractive indices and nz the thickness-direction refractive index of the films, and wherein said optical compensation film has a positive in-plane retardation that satisfies the relations of 0.7<R450/R550<1 and 1<R650/R550<1.25, wherein R450, R550, and R650 are in-plane retardations at the light wavelengths of 450 nm, 550 nm, and 650 nm respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.