What is the Principle of Anti-Glare Exterior Rearview Mirrors?
2 Answers
The principle of anti-glare exterior rearview mirrors: The lens of an anti-glare mirror is not a flat mirror of uniform thickness, but rather a wedge-shaped mirror with an angle of approximately 10 degrees. When the anti-glare lever is pushed forward, the entire mirror surface tilts upward by about 10 degrees. At this point, only the semi-transparent coating layer of the rearview mirror is visible, which has a lower refractive index for light, thus providing a certain anti-glare effect. Automatic anti-glare rearview mirrors consist of a special mirror, two photodiodes (front and rear), and an electronic controller. The electronic controller receives signals from the front and rear photodiodes. If the rear photodiode detects stronger light than the front one, the electronic controller outputs a voltage to the conductive layer of the mirror. This conductive layer then changes the color of the mirror's electrochromic layer. As a result, strong light reflected by the anti-glare mirror to the driver's eyes appears as dim light, preventing glare.
I used to be constantly dazzled by headlights from behind when driving at night, but the auto-dimming rearview mirror has been a game-changer. Its core mechanism involves a small photoelectric sensor that continuously monitors the intensity of rear light. Upon detecting strong glare, it instantly activates an electronic system to alter the mirror's reflectivity. Specifically, the mirror surface is coated with special materials like liquid crystal film or electrochromic layer—applying a tiny electrical current darkens it, softening reflected light to eliminate harsh glare. Beyond enhancing safety, it significantly reduces eye strain by minimizing the brain's need to constantly refocus vision. Having tested it multiple times, I find it particularly effective during turns or on highways, providing instant relief from discomfort. The design is ingeniously practical—it even extends mirror lifespan by reducing light-induced degradation. In short, this automatic dimming feature delivers smoother, more relaxed driving. I highly recommend all car owners explore such smart innovations.
