3M made (makes) such a material. It was used in residential and commercial
windows as a means of providing privacy. The material was a liquid crystal based
polymeric film. when a bias voltage was applied, the film was transparent. When
removed, the film became opaque, a sort of milky white color. We can produce the
material in large formats as you might expect a picture window would require. I
believe the power supply required to drive the film as about 30 volts.
I am somewhat unceertain of the specifics of the material as I had only a
tangential association with it. If this is what your looking for, I'll find the
correct contact in 3M for you.
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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