Smart film is an intelligent film, a film that can be directly sticked on glass, which can adjust light under electric pressure to switch between transparent and mist, and meet the double requirements of glass on penetrability and privacy protection; lighting is good even when it’s not transparent. It’s unreachable by other curtains of today and have insulation and reflection effect on infrared light, which makes your room warm in winter and cool in summer, environmental and energy saving. This product realizes opto-electrical functions of optical film by employing LC optics.