Circularly polarizing plate comprising linearly polarizing membrane and quarter wave plate
US6400433B1 · kind B1 · utility
32Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1999 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Nov 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133638
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A circularly polarizing plate comprises a linearly polarizing membrane and a quarter wave plate. The quarter wave plate comprises an optically anisotropic layer A and an optically anisotropic layer B. The quarter wave plate has such an optical characteristic that a retardation value essentially is a quarter of a wavelength when the retardation value is measured at the wavelength of 450 nm, 550 nm and 650 nm. One of the optically anisotropic layers A and B is a layer made from liquid crystal molecules, and the other is a polymer film or a layer made from liquid crystal molecules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.