What is the principle of dimmable glass?

The so-called dimmable glass is a kind of special glass that can automatically adjust the amount of light entering the room according to the intensity of light. You may have worn a kind of color-changing glasses, right? Its transparency can be changed indoors and outdoors. When you walk from indoor to outdoor under the dazzling sunshine, the glass on your glasses will change color, in fact, it will become opaque, which will greatly reduce the light entering your eyes and achieve the purpose of protecting your eyes. The glass on this color-changing glasses is dimmable glass.

Not long ago, scientists invented a window glass that can adjust the light by itself. The characteristics of this kind of glass are: when the weather is cold and the temperature is low, the transparency is very high, and all the sunlight will enter the room, which will increase the indoor temperature; It becomes translucent when the weather is hot, which makes the room cool.