Auto-dimming rearview mirrors function by detecting and reacting to the light radiating from the headlights of vehicles behind them. These mirrors feature an optical coating that can absorb visible light and reflect infrared light, which the human eye cannot see. The absorbed energy creates electrical charges in the glass, which are then transmitted to sensors at the corners of the mirror. After processing by an integrated circuit and amplification, the signals are transmitted down two wires to an LCD screen within the mirror housing. The electrical signals cause the molecules in the LCD to reorient themselves; this, in turn, affects the amount of light that passes through and is reflected from the mirror, reducing the brightness in the presence of excessive ambient light. The purpose of auto-dimming mirrors is to enhance drivers' visibility during nighttime. This is achieved by reducing glare and providing a clearer view of traffic or other vehicles behind the driver. Thus, drivers no longer have to strain their eyes while glancing back while driving. Today, an auto-dimming rearview mirror is one of the most popular convenience accessories for cars and trucks. It makes driving safer and more comfortable.
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