HOW IS POLYVISION™ GREEN?
Polytronix is aware of the importance of limiting its carbon footprint, and is proactive in implementing directives to ensure our glass/film products are ecofriendly. Switchable Privacy Glass saves energy by using natural lighting while maintaining privacy.
Structure of Polyvision™ Liquid Crystal Film
PDLC (Polymer Dispersed Liquid Crystal) is a medium whose light scattering power is adjustable through applying an electric field. In their natural (uncharged) state, the PDLC droplets randomly align.
PDLC Light Scattering Mechanism (How it Works)
The ordinary refractive index of these liquid crystals does not match that of the polymer, and the incident light is thus scattered, resulting in a translucent state. When an electric field is applied across the material, the PDLC droplets re-orient, and subsequently the extraordinary refractive index of the liquid crystal matches that of the polymer. Therefore, the incident light can pass through, resulting in a transparent state.
Field tests have successfully demonstrated that Polyvision™ Switchable Privacy Glass, when properly installed and maintained will last for more than ten years.
Polyvision™ Privacy Film is made of two layers of transparent conductive films sandwiched with PDLC material. The film is then laminated between two pieces of glass. When electricity is applied to the film the liquid crystals line up and the window is clear. When the power is turned off, the liquid crystals return to their normal scattering positions and turn the glass from clear to translucent.
The liquid crystal privacy glass is constructed in a way similar to the construction of laminated glass. The outside skins are made up of glass (normally 5 or 6 mm of annealed glass) on each side, and then a PVB interlayer is inserted on each side to trap and hold the liquid crystal privacy film. This film has electrical wiring that needs to be connected to a transformer to supply power for the “on” (clear state) mode.
To learn more about the features and specifications of Polyvision™, read our Technical Manual.