What is the Principle of Auto-Dimming Rearview Mirrors?

1 Answers
SanBrandon
07/30/25 10:54am
Auto-dimming rearview mirrors are controlled by related photosensitive electronic components. Here are the relevant details: 1. Principle: An auto-dimming rearview mirror consists of a special mirror, front and rear photosensitive diodes, and an electronic controller. The electronic controller receives signals from the front and rear photosensitive diodes. When activated, if the rear photosensitive diode detects stronger light than the front one, the electronic controller outputs a voltage to the conductive layer of the mirror. This conductive layer then alters the color of the mirror's electrochromic layer (the higher the voltage, the darker the color). As a result, strong light reflected by the auto-dimming mirror appears dimmer to the driver's eyes, reducing glare. 2. Activation Method: Except for a few models where the auto-dimming function can be toggled via a button on the mirror, most auto-dimming rearview mirrors are enabled by default.
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