Electrochromic glass was developed in 1993.
Electrochromic glass is coated with a thin film that changes colour when exposed to electric current, usually by the push of a button. This feature reduces the amount of heat from the sun that would otherwise accumulate in the building. The glass can also be used for privacy.
Electrochromic glass is a type of smart glass, also known as intelligent glass or dynamic glass. Smart glass regulates its transparency, and thereby the amount of light transmitted, by using electric current, light or heat.