Fast transition polymer dispersed liquid crystal shutter for display screen and method of manufacture therefor
US5784138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Aug 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
For use in the display screen of a teleconferencing system, a shutter capable of assuming alternative transparent and scattering states and a method of manufacture therefor. In one embodiment, the shutter includes a film of a polymer-dispersed liquid crystal (PDLC) composition of a polymer and a liquid crystal material wherein the liquid crystal material makes up about 78% by weight of the film. The film is cured at a temperature ranging from about 32.degree. C. to about 38.degree. C., thereby decreasing the time it takes for the film to switch between the transparent and scattering states. The shutter further includes first and second layers of a transparent conductor for containing the film therebetween and driver circuitry, coupled to the film, for causing the film to have a response time equal to or less than 8 ms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.