The longer the set duration to prevent your iPhone screen from going dark, the more your battery will be used, which will be counterproductive if you need to extend battery life.

5. Dark Mode

This feature darkens many of the brightly colored menus, controls, and backgrounds on your iPhone by changing the background color palette to black and dark gray. Although Dark Mode doesn't affect the iPhone's brightness, it can make it appear dimmer.

You can try turning it off from Settings > Display & Brightness. Alternatively, you can schedule it for nighttime, along with the Night Shift feature. This will help you keep your screen bright and vibrant throughout the day while intentionally darkening it at night.

6. Attention Aware Features

Apple uses the Face ID sensors on the iPhone to enable Attention Aware features, which dims the screen if you're not looking at it.

The Auto-Lock and Attention Aware features work together. If you've set your Auto-Lock to one minute, the iPhone will lock itself when it hasn't had your attention for that time. But if you look at the screen, even if you haven't touched it, Attention Aware will understand that you're still looking and won't lock your iPhone even after the set period has passed.

Therefore, if the feature is turned off, it can cause the screen to dim randomly, even when you're looking at it as the iPhone prepares to lock itself. You can turn it on by going to Settings > Face ID & Passcode > Attention Aware Features.

Doing this will likely fix the problem of your randomly dimming iPhone screen when Auto-Lock is enabled.

7. Low Power Mode

The iPhone's Low Power Mode is a setting that reduces background activity to save power and make your phone last longer.

This feature affects everything from email fetching to visual effects, like the Auto-Lock feature and screen brightness. Hence, this can be another reason why your iPhone is dimming randomly.

To turn this feature off, go to Settings > Battery and toggle Low Power Mode. Check out our iPhone Low Power Mode guide to learn more.

8. Overheating

Overheating is when your iPhone shows a black screen saying that the "iPhone needs to cool down before you can use it," because its temperature has exceeded the safe range.

Following this message, the iPhone takes measures to reduce its temperature, like using less battery and RAM. This can lead to automatic screen dimming and an overall slower iPhone.

For more information, check out our iPhone overheating guide, where we've covered why the phone gets hot and how you can fix it.

9. Reduce White Point

The Reduce White Point feature sits quietly in Settings > Accessibility > Display & Text Size and is disabled by default. However, if you have turned it on, try disabling it to see if your iPhone's colors and brightness improve.

This feature is designed to reduce the intensity of the colors on your screen. It can cause your screen to appear dim if enabled.

Unless you've recently bought a used iPhone whose previous owner may have activated the feature, it may not be causing the random dimming effect.

10. Hardware Problems

Some users can still face the screen dimming issue on their iPhones despite trying everything. And if you're one of them, your iPhone likely has some hardware issues. As a final resort, you can try the following:

If these didn't work out either, you should contact Apple Support or visit a nearby Apple Store or Apple-authorized service center to get your iPhone's hardware checked as soon as you can.

Stop Your iPhone's Screen From Dimming

Apple has certain features baked into iOS to provide the best visual experience for iPhone users. However, these could be causing random dimming effects, which can be annoying. So, try toggling these features on and off, and you'll likely fix the issue you're facing.

That said, remember that these features aim to protect your eyes and your iPhone. We suggest you keep them enabled, especially if you have vision problems.