How Auto-Dimming Rearview Mirrors Work
An auto-dimming rearview mirror works on the principle of electrochromism, where an object changes color according to different levels of the electrical stimulus. An auto-dimming rearview mirror has five layers of material sandwiched between a piece of glass and a mirror. The glass is just clear with an electrolytic film between the outer two conductive layers followed by the ion storage layer, an electrolyte and the electoral chromatic layer. With no voltage applied, this would be transparent, and light would pass through the glass and bounce back from the mirror and into the driver's