Laptops, phones and tablets turn off their screen after detecting inactivity. If the toggle switch is green, it's already on.
The phone needs about a week to relearn your lighting preferences.įor an iPhone, enable it by going to Settings | Accessibility | Display & Text Size | Auto-Brightness. If your lighting changes and the screen is not what you want, change it again. To clear the preferences, tap or search for your Settings | Apps | Device Health Services | Storage | Clear cache. If you've been frustrated with changes in brightness that you didn't expect, you can clear those preferences and make the phone learn all over again. To lower the brightness, use your finger to drag the line between light and dark down or to the left, depending on your phone's orientation.Īlternatively, many devices have a sensor that can detect ambient light around you and adjust the screen accordingly, such as by brightening the display in a dark room.Īndroid phones already have adaptive brightness enabled and are supposed to learn your preferences as you use your phone. On an iPhone or iPad, swipe down from the top right corner of your display - or on iPhone 8 or earlier, swipe up from the bottom edge of your display - to access the Control Center, which has a thick brightness bar identified with a ☼ sun icon. Manually lower the brightness of your phone or tablet by dragging the dot on the bar with your finger. You'll see a ☼ sun icon at the bottom, likely to the left of a thin bar. On an Android device, swipe down twice from the top of your screen. This can usually be found in the Options or Settings area. Turn down the brightness of any screen you're on to at least half to help preserve battery life.
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