Phase difference plate comprising polymer film containing compound having rod-shaped molecular structure
US7060333B2 · kind B2 · utility
15Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2002 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Mar 14, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133638
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phase difference plate which comprises one sheet of polymer film containing a compound having a rod-shaped molecular structure and exhibiting a maximum absorption wavelength (λmax) of less than 250 nm in an ultraviolet spectrum of its solution and which exhibits a retardation value as measured at a wavelength of 450 nm (Re450) of 60 to 135 nm and a retardation value as measured at a wave length of 590 nm (Re590) of 100 to 170 nm, where the relationship: Re590−Re450≧2 nm is satisfied. The phase difference plate functions as a λ/4 plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.