Phase retarder and liquid crystal display using the same
US5061042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1991 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Jan 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phase retarder obtained by uniaxially stretching a thermoplastic resin film, whose retardation value ranges from 30 to 1200 nm and whose color difference .DELTA.E* is not more than 30 as defined with the phase retarder being set between crossed polarizers in such a manner that the optical axis thereof makes an angle of 45.degree. with respect to the planes of polarization of the polarizers, and a liquid crystal display using the phase retarder are disclosed. The phase retarder has a fixed optical axis, a retardation value suited for new optical uses including liquid crystal displays, and freedom from optical color unevenness. The liquid crystal display using the phase retarder exhibits markedly improved image quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.