What is Auto-Dimming Mirrors?

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What are auto-dimming mirrors?

Auto-dimming mirrors are the special variety of rearview mirrors that may dim the sunshine reflecting from their surface. These mirrors reduce the glare of sunshine coming from trailing vehicles significantly thereby reducing driver fatigue. Naturally, such mirrors influence be very useful while driving on heavy traffic roads at the hours of darkness. Internal, similarly to external rearview mirrors fitted on a vehicle, will be of this kind.

A glance at history reveals that auto-dimming mirrors were invented within the late 1950s. However, their commercial application started after the year 1980. Gentex is one of the foremost reputed manufacturers of auto-dimming mirrors.


Why use auto-dimming mirrors?

The glare of the sunshine from behind that reflects from the mirror irritates the driving force lots while driving at midnight on a busy road. It also leads to poor visibility. Prolonged exposure to such light induces a severe strain within the driver’s eyes. In keeping with scientific studies, such a glare almost doubles the driver’s reaction time thereby increasing the danger of accidents. Manufacturers employ auto-dimming mirrors to avoid such mishaps. Now, these mirrors are gaining rapid popularity within the vehicle industry.


An auto-dimming mirror has the subsequent major components:

Ambient Sensor: Senses the ambient light. When it senses low ambient light, it gives a symbol to the control unit saying that it’s time to start out working!

Glare sensor: It measures the intensity of the sunshine falling on the mirror and sends the corresponding signal to the control unit.

Control unit: It monitors the functioning of both the sensors and decides against reducing the glare.


Construction of an auto-dimming mirror:

The auto-dimming mirror contains a sandwich-type construction and works on the principle of electrochromism. It comprises a mirror and a plane glass. Two conductive layers are placed side by side to every of the mirror and also the glass. Between these conductive layers, ion storage, electrolyte, and electrochromic layers lie.

After control unit orders to cut back the glare of sunshine, the system applies an electrical voltage across the conductive layers. This causes ions to result in the ion storage layer to the electrochromic layer causing it to darken thereby reducing the number of sunshine reflecting from the mirror. Thus, it achieves glare reduction or dimming.


Advantages of auto-dimming mirrors:

  1. It enhances visibility at nighttime which is otherwise hampered by glares from other vehicle lights.
  2. Improves safety thanks to better visibility.
  3. It reduces strain on the eyes and driver fatigue.

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