We’ve all experienced the blinding reflection of the headlights of the car behind us in the rear-view mirror. It can be not only annoying, but also dangerous. Luckily there’s a simple solution to this problem: Auto-Dimming rear-view mirrors. And we at Flynn BMW can explain how they work.

Auto-Dimming rear-view mirrors are electrochromic. They are usually equipped with two sensors: one on the front of the mirror that detects a direct glare from headlights, and one on the back of the mirror that detects an ambient reflection from the windshield.

There is also a control circuit which decides when to dim the mirror based on the signals it receives from the two sensors. When a car pulls up behind you, the front sensor will catch the glare and immediately and tell the control circuit to dim the mirror. It does this by sending a low voltage signal to the electrochromic layer in the mirror, which in turn darkens it and prevents reflection.


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