Phase retarder and liquid crystal display device using the same
US6060183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1997 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13363
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phase retarder film comprising a layer of polyvinyl alcohol or a derivative thereof and a water-swellable layered inorganic compound, wherein the in-plane retardation value is smaller than the retardation value in the thickness direction, sometimes causes durability failures, that is, the layer is peeled off from a transparent resin substrate in high temperature and high humidity environment. Therefore, the present invention provides a phase retarder film which is superior in durability. With respect to a phase retarder film comprising at least one layer containing at least one organic clay compound which can be dispersed in an organic solvent, wherein the in-plane retardation value is smaller than the retardation value in the thickness direction, the durability is remarkably improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.