Imagine your phone has a tiny eye that can see how bright or dark it is around you. When it sees sunlight, it tells the screen to get brighter so you can still read. When it gets dark, it tells the screen to dim so it doesn’t hurt your eyes, just like when you turn on a night light at home.
How It Works
This tiny eye is called a light sensor. It measures how much light is around and tells the phone what brightness level feels best for your eyes.
Examples
- When it's dark, your phone dims like a nightlight in the middle of the night.
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See also
- Why Do Smartphones Automatically Brighten or Dim?
- How Do Touchscreens Know Where You Tap?
- Why Do Smartphones Use So Much Battery When You're Just Looking at Them?
- How Do Smartphones Know You're Looking at the Screen?
- How Can a Tiny Chip Hold All Your Data?