Liquid crystal writing slate with improved light-transmission retention
US5136404A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Aug 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display device includes a base supporting a laminate which has an LC-layer (liquid crystal layer) formed of polymeric material holding micro-volumes of liquid crystal material, and a conductive layer on one surface of the LC-layer, the other surface of the LC-layer being substantially conductor-free, and apparatus for transitory application of potential through the LC-layer to the conductive layer to produce an image. The LC-layer has at least about 50% by weight of the polymeric material and less than 50% of the liquid crystal material by weight of the LC-layer, and the duration of image retention after transitory application of potential ceases is significantly extended.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.