Your phone has a tiny eye that watches the light. When it's sunny, this eye tells your phone to brighten its screen so you can see better. At night, when there’s less light, it makes the screen dimmer for easier reading.
Examples
- It dims at night so it’s easier to read on your bed.
- You don’t have to adjust it, it does it automatically.
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See also
- Why Do Smartphones Automatically Adjust Brightness?
- How Does Your Phone Know You're Talking to It?
- How Do Smartphones Know You're Taking a Photo?
- How Do Smartphones Know You're at the Airport?
- Why Do Phones Automatically Adjust Brightness?