In polymer dispersed liquid crystal devices (PDLCs), liquid crystal droplets are arranged in a sheet between two layers of glass. In the "off" state, they are randomly oriented and, when switched on, they align according to the electic field. The liquid crystals scatter light, without blocking it, thus the glass looks white even when in its transparent state. There is no possibility to control the amount of light and heat passing through, and the device operates in on/off states only. This technology has been used in interior settings for privacy control (for example conference rooms, intensive-care areas, bathroom/shower doors) and as a temporary projection screen. It has been marketed under the name of "switchable privacy glass".
For more information visit: http://en.wikipedia.org/wiki/Smart_windows
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