Liquid crystal writing slate
US5115330A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Aug 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A slate, such as a writing/drawing slate, 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, a conductive layer on one surface of the LC-layer, and a substantially transparent protective overlayer on the other surface of the LC-layer, apparatus for transitory application of potential through the LC-layer to the conductive layer to produce an image on the image-displaying surface area, and apparatus secured to the base to facilitate erasing of the image. In preferred embodiments the other surface of the LC-layer is substantially conductor-free.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.