What is the middle button on the Audi rearview mirror?
1 Answers
The middle button on the Audi rearview mirror is the anti-glare rearview mirror light sensor. Structure of the anti-glare rearview mirror: The anti-glare rearview mirror consists of a special mirror, two photodiodes, and an electronic controller. The electronic controller receives signals from the photodiodes for front and rear light, and is installed below the front windshield of the vehicle. Working principle of the anti-glare rearview mirror: If light shines on the interior rearview mirror, and the rear light is stronger than the front light, the electronic controller will output a voltage to the conductive layer. This voltage changes the color of the electrochromic layer—the higher the voltage, the darker the layer. As a result, even strong light shining on the rearview mirror will reflect as dim light to the driver's eyes, preventing glare.