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All about auto-dimming IRVMs and how it works?

Driving at night is a bizarre experience for the driver, no matter how good movies make them be but sometimes handling the oncoming glare from the cars can be very annoying due to the eye-burning bright lights of maybe a truck, that not all the glare coming from the car behind you can also affect you as those glares are directly reflected to you by your rear-view mirrors. This can even affect your health can cause driver fatigue, but the good thing is with modern technologies the glare coming from behind you can be avoided by auto-dimming IRVMs.

For a basic description, the Auto-dimming IRVMs are the internal rear-view mirrors in your car cabin which automatically dims themselves when a bright glare of the tailing car strikes the mirror facilitating the driver to see what is behind him.

auto-dimming IRVMs

Now we know what auto-dimming IRVMs are so, now let’s see what is the science behind them.

If not going deep into the geeky stuff the working can be explained as –

Inside the simple looking mirror there are 3 major parts

  • The 2 basic sensors; first for sensing the ambient light and second sensor to detect the glare coming from behind and the intensity of the light.
  • The main part is the control circuit IC which calculates and gives command against the reflected glare intensity to the mirror setup
  • The 3rd part is the mirror which here is called the Electro-chromic mirror.

When a bright glare from the tailing car falls over the Glare sensor it sends an input signal to the control circuit which then activates the ambient sensor and reads the light of your surroundings. Upon comparing these light intensities if the control circuit finds the difference quite large then the control circuit sends a 12V pulse to the Electro-chromic mirror which when received by the mirror it turns darken depending on the light intensity measured by the sensor.

And when the light from behind is no longer there then the same goes for the intensity difference so, the 12V supply is cut and the mirror turns back to normal.

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