Your phone has a tiny eye that tells it how bright it is outside. When you go out in the sun, your phone sees it's very bright and turns up its screen so you can see what you're looking at better. It's like when you squint in the sunlight, your phone is doing the same thing automatically.
Examples
- Your phone's screen brightens when it notices a lot of sunlight around it.
- It's like your phone has an eye that tells it how much light is coming through.
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