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Ten Reasons Your iPhone Automatically Dims The Screen

Your iPhone could change the screen brightness for a variety of reasons.


iPhone users complain often about the screen automatically dimming. There are usually good reasons for the screen dimming, such as auto-brightness and True Tone. There are also hardware problems that can cause the iPhone screen to become dimmed, such as overheating.

This guide will discuss the causes of your iPhone’s screen dimming, what you can do to prevent it from happening again, and whether or not it is worth it. Let’s get started.

1. Auto-Brightness

Your iPhone’s screen dimming automatically is likely due to the auto-brightness function. This feature adjusts your screen brightness to match the surrounding light conditions. The ambient light sensor is located near the iPhone’s front camera.

The screen will appear brighter when you are outside. The screen dims when it is dark to conserve power and reduce eye strain.

Auto-Brightness by default is disabled. However, you can turn it off. Go to Settings >Accessibility > Display Size and scroll down to the bottom to disable Auto Brightness.

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2. True Tone

The colors are also affected by the light in your environment. Warmer lighting can make colors appear yellower. Apple introduced True Tone to its iPhone to combat this problem and guarantee accurate color. This feature adjusts the screen colors based on the surrounding light using sensors.

Although it is an excellent feature, it can cause your screen to appear darker or less saturated in certain lighting. It might be possible to turn it off and solve the auto-dimming issue. Go to Settings > Brightness and Display, then turn off True Tones.

3. Night Shift

Apple’s Night Shift function is available on iPhones and iPads . This feature reduces the amount of blue light entering your eyes at nights. This feature adds an overlay to the display that makes it appear more warm.

The screen can appear dimmed by Night Shift. The screen dimming effect can appear to be automatic because it is set to turn on automatically after sunset. This can be avoided by leaving Night Shift enabled , or turning it off completely in Settings > Display and Brightness > Night Shift.

4. Auto-Lock

Your iPhone’s randomly dimming screen could be caused by the Auto Lock feature. This feature locks your iPhone after a certain amount of inactivity, such as 30 seconds. It prevents other people from accessing the device.


The screen will dim when there are only a few seconds left of inactivity. This indicates that the iPhone is about to lock itself. The iPhone will lock automatically after the set period. Your screen will dimming frequently if the duration is not enough. This can happen at random.

To change the duration, go to Settings > Display and Brightness > Auto Lock.

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5. Mode Dark

By changing the background palette from white to dark gray, this feature will darken many of your iPhone’s brightly colored controls and menus. While Dark mode does not affect the iPhone’s brightness it can make it look darker.

You can turn it off via Settings > Display and Brightness. You can also set it to turn off at night using the Nightshift feature. This will allow you to keep your screen bright throughout the day and darken it at night.


6. Attention!

Apple’s TrueDepth camera was introduced with the iPhone X in 2017. It is used to create Face ID. This sensor can also be used to enable the Attention-Aware feature that dims the screen when you aren’t looking at it.

Both the Attention Aware and Auto-Lock features work together. The iPhone will lock automatically if you have set the Auto-Lock timer to 1 minute. Attention Aware means that your iPhone will not lock itself even if it hasn’t been touched for a set time.

If the feature is disabled, the screen can dim randomly as the iPhone locks itself. It can be turned on by going to Settings> Face ID & Passcode > Attention-Aware Features. This will most likely resolve the issue of the iPhone’s randomly dimming screen.


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7. Low Power Mode

The Low-Power Mode on the iPhone is a setting that minimizes background activity to reduce power consumption and prolong battery life. This feature can affect everything, from email fetching to visual effects such as the Auto-Lock feature or screen brightness. This could also be a reason your iPhone dims randomly.

To disable this feature, go to settings > Battery. To learn more, visit our iPhone Low-Power Mode guide.

8. Overheating

Your iPhone will display a black screen if it has overheated. This is because the iPhone’s temperature has reached a dangerous level. The iPhone responds by using less RAM and battery. This could result in an iPhone that is slower and has a lower screen brightness.

You can find more information in our iPhone heat guide. We’ve provided detailed information about the causes and solutions to hot phones.

9. Reduce White Point

The Reduce white point feature is quietly located in Settings> Accessibility > Display Size. It is disabled by default. This feature reduces the intensity of your screen’s colors. If enabled, it can make your screen appear dimmed.


You can disable it if you’ve already turned it on to test if the colors and brightness of your iPhone changes.

The Reduce White Point won’t activate unless enabled. This means that it might not be causing random dimming.

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10. Hardware problems

Many users complain on Apple Discussions that their iPhone screen dims randomly despite trying everything. These settings may not have helped you. Your iPhone might be experiencing hardware problems. You can also try these options:

  • Restarting your iPhone can reset certain features and resolve the problem.
  • Doing a complete iPhone factory reset.

These options may not work. Apple Support or a third party technician can help you to diagnose and fix hardware problems with your iPhone.

Protect your eyes from the iPhone

Apple has provided features to ensure you have the best possible visual experience. These features could cause random dimming effects that can be irritating. You can toggle these features on/off to resolve the problem.

These features are designed to protect your iPhone and eyes. These features should be enabled, especially for those with vision impairments. Apple also offers accessibility features to assist visually impaired users.


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