Switchable Smart glass is a kind of high-tech special glass which is laminated of two pieces tempered or clear float glass with PVB/EVA and smart PDLC Film in between. The glass have same function as smart PDLC Film can switch from opaque to transparent instantaneously. It is transparent when power on and opaque when power off, The transmittance can be adjusted with voltage regulator. The use of smart glass can save costs for heating, air-conditioning and lighting. When opaque , liquid crystal or electrochromic smart glass blocks most UV. And the smart glass can also work as a rear projection screen.