Electro-optic display devices and methods
US4009934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1974 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Jun 28, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1392
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An electro-optic display is provided which uses a liquid crystalline composition (a) having a positive, zero frequency dielectric anisotropy and (b) exhibiting a dielectric anisotropy inversion with increasing frequency of an applied field. Such a composition is subjected to an electric field of a first audio frequency and then subjected to a field of a second audio frequency of a magnitude sufficient to produce a dielectric anisotropy inversion in said composition. The resultant anisotropy changes allow the molecular orientation of the composition to be altered by the applied field thereby changing the optical properties of the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.