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Introduction:
When it is done in a proper way, a piece of glass can adjust the light transmission rate passing through it by changing its transparency or colour. This process is called chromogenic. There are several chromogenics. They are electrochromic, photochromic, thermochromic and gasochromic etc. The most popular is electrochromic. There are two types of electrochromic, PDLC (polymer dispersed liquid crystal) and SPD (suspension particle device). And PDLC is most frequently used.

PDLC glass is a light control glass. It can regulate and adjust the light intensity or light transmission passing through the glass. Sometimes, it is known as intelligent glass, magic glass, privacy glass, smart glass or switchable glass.


Polymer dispersed liquid crystal film is a light changing liquid crystal film. It is base on the especial performance of liquid crystal material ?light valve?. Crystal tiny drop in this film under external electric field rank, distribute in order, when incident light completely permeate, film display clear and colorless state; when external electric field disappear, crystal tiny drop in this film rank order is disturbed, which is made incident light scattering to create ?sandblasted glass? effect. Also let positive and negative type of PDLC crystal dye bond make full color light valve film, through change voltage size and frequency to show kinds of color.