Imagine you have a special kind of paper that can change its colors with just a tap. Smart film works the same way as that special paper. It's a thin layer made of a material that can change the amount of light it lets through when you press a button or flip a switch.
You can stick this smart film on a window or a glass surface, like a computer screen. It will look like regular glass when it's not turned on. But when you switch it on, the smart film layer will change its transparency, making the glass opaque or clear.
This is called electrochromism - a big word that means changing colors using electricity. The smart film contains tiny particles that respond to an electric signal by moving and changing the arrangement of the materials that make up the film.
Now, why would you want a smart film on your windows or screens? One reason could be to increase privacy. If your smart film is on your windows, you can make them opaque when you don't want anyone to see inside your home. When you want more sunlight, you can make the film clear again. This is great when you want to watch a movie, take a nap, or have a private conversation.
Another reason you might use smart film is to save energy. When you make the film opaque, less sunlight can come through the window. In hot weather, this means less heat is entering your home, which can save energy and keep your house cooler. In the winter, the reverse happens - with more light coming through the clear film, your home can stay warmer with less heating.
Overall, smart film is a great invention that can enhance privacy, conserve energy, and make your living space more comfortable.