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You Wonder Why Your iPhone Screen Randomly Dims? Here is Why

by Steve Herlington

If you have an iPhone. You may have noticed its screen randomly dimming, even with the brightness slider on its maximum setting. 

There are a few reasons why this happens, starting with the most obvious: the auto brightness feature. Most modern smartphones have an ambient light sensor that detects the brightness of your environment, when it’s dark, at the backlight dims to make the screen less harsh to look at while also saving battery. 

If you’re outside in the sun, the display will typically reach peak brightness so you can still see your content, but if auto brightness is turned off and the display still randomly dims, especially while outdoors in direct sunlight, it could be because the device is too hot. When the iPhone overheats it’ll go through a variety of actions to cool itself down  and dimming the display is one of them, since it draws less power from the battery and generates less heat.

you may also experience reduced performance and speed, since slowing down the processor also reduces heat. If none of these actions work and the iPhone’s temperature continues to rise, the last resort is a shutdown, which it’ll do automatically. 

But if your phone isn’t hot, then the TrueTone feature could be to blame for the appearance of a dimming screen. It uses sensors to adjust the color and the intensity of your display to match the ambient light so that images appear more natural, but this can make the screen dimmer than usual. And you can turn off this feature in settings, to check how it affects your screen brightness. Another feature with a similar dimming effect is the Night Shift, which automatically activates at nighttime. It changes the tone of your screen to a warmer, orange color, filtering out the blue light. Now, this technically shouldn’t affect the screen’s brightness, but it may cause content to be more difficult to see, since the screen’s orange hue is uncomfortable for some people. Finally, the iPhone’s display is set to dim after a certain period of time without interaction to save the battery, this can also be changed in settings.

This article is inspired by a video in Apple Explained YouTube channel.

Steve Herlington

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