Switchable Transparent Glass(STG) (also called Smart Glass). Its principle is by adding Polymer Dispersed Liquid Crystal(PDLC) film between two pieces of glass, apply voltage to the terminal and change the transparency of the glass via adjusting the voltage to make the particles in the PDLC film arranged in a certain direction. The light transmittance will change when the voltage is applied. It is translucent when it is powered off and it becomes transparent when it is powered on.
The STG is a manufactured assembly consisting of two sheets of tempered glass bonded together by PVB/EVA and PDLC film. Here is the product structure diagram for your review hereunder:
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