The Basics of Auto-Dimming Rearview Mirrors

Automotive-related tech is one of our favorite subjects, and we here at Kokomo Auto World love to share it with drivers. Auto-dimming rearview mirrors are a fascinating piece of tech that never gets old. If you don't know how auto-dimming rearview mirrors work, here's a basic rundown.

Auto-dimming mirrors contain electrochromic gel sandwiched between two layers of glass. This gel darkens when an electrical charge passes through it, after ambient light sensors inside the rearview detect glare. The sensors are usually a camera or a photodiode-based semiconductor that turns light into a current. The darkening of the gel is the outcome of an oxidation-reduction reaction to the electrical charge passing through it.

Auto-dimming rearview mirrors do more than prevent dangerous glare from behind you. They prevent the blind spot that ensues when the driver behind turns off. This blind spot is called the Troxler Effect, and it can delay your response time by 1.4 seconds. Consequently, auto-dimming rearview mirrors are all but standard features deemed essential to overall driving safety.

 

 

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