Fast transition polymer dispersed liquid crystal shutter for display screen and method of manufacture therefor
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United States of America Patent
Stats
-
Jul 21, 1998
Grant Date -
N/A
app pub date -
Aug 22, 1996
filing date -
Aug 22, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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