Polymer packaging material for liquid crystal cell
US4456638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1983 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Nov 1, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A twisted nematic liquid crystal material is sandwiched between two electrode carrying polymer film or sheet substrates in a liquid crystal display assembly. The substrate material preferably is a semi-crystalline aromatic heterochain polymer characterized by a glass transition point (T.sub.g) of at least 90.degree. C. and devoid of secondary transitions in the -50.degree. C. to +80.degree. C. range. The crystallinity of the polymer material is controlled so that the crystallite size in the polymer material is substantially smaller than the wave length of visible light (350-750 micrometers). In a preferred embodiment, an optically isotropic top substrate is formed by a sheet of amorphous cast thermosetting acrylic resin and the lower substrate is formed by a flexible sheet of semi-crystalline aromatic heterochain polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.