Why Does My iPhone Keep Dimming? Uncover the Reasons Behind It

Have you ever noticed your iPhone screen dimming on its own? It can be quite perplexing, right? Well, you’re not alone, and there are some pretty logical reasons behind this phenomenon. In this article, we’ll walk you through why your iPhone might be dimming and provide you with a step-by-step guide on how to address it.

Step by Step Tutorial on Why Does My iPhone Keep Dimming

Before we dive into the steps, let’s understand what we’re trying to accomplish here. We want to identify the reasons why your iPhone screen dims and learn how to control or prevent it from happening.

Step 1: Check for Auto-Brightness

Auto-Brightness automatically adjusts your screen’s brightness based on ambient light conditions.

When enabled, Auto-Brightness uses a light sensor built into your iPhone to adjust the brightness of your screen, which can cause it to dim. You can find this setting under ‘Accessibility’ in the ‘Display & Text Size’ menu.

Step 2: Disable Auto-Lock

Auto-Lock turns off your screen after a certain period of inactivity to save battery life.

If your screen dims before it locks, this could be due to the Auto-Lock feature. You can adjust or disable Auto-Lock in the ‘Display & Brightness’ settings.

Step 3: Check for Low Power Mode

Low Power Mode reduces power consumption by dimming the screen and adjusting other settings.

When your iPhone’s battery gets low, it may automatically enable Low Power Mode, which dims the screen. This can be turned off in the ‘Battery’ settings.

Step 4: Update iOS

Software issues can sometimes cause screen dimming, and updating iOS can resolve these problems.

If your iPhone’s operating system is out of date, it could be causing your screen to dim. Check for updates in the ‘General’ settings under ‘Software Update’.

After completing these steps, you should have a better understanding of why your iPhone screen dims and how to control it.

Tips on iPhone Screen Dimming

  • Keep your iPhone updated to the latest iOS version to avoid software glitches.
  • If you’re reading in low light conditions, consider manually adjusting the brightness instead of relying on Auto-Brightness.
  • Be mindful of battery-intensive apps that can cause your iPhone to enter Low Power Mode more frequently.
  • Clean the light sensor located near the front-facing camera, as dirt can affect its ability to accurately read ambient light.
  • If you’re still experiencing issues after trying these steps, consider visiting an Apple Store or contacting Apple Support for further assistance.

Frequently Asked Questions

Why does my iPhone screen keep dimming even though Auto-Brightness is off?

Your iPhone could be in Low Power Mode, or a software issue might be causing the screen to dim. Check your battery settings and consider updating your iOS.

Can a damaged iPhone screen cause it to dim randomly?

Yes, hardware issues like a damaged screen can cause unpredictable dimming. If you suspect a hardware problem, get your iPhone checked by a professional.

Will using a screen protector affect the Auto-Brightness feature?

Some screen protectors can interfere with the light sensor, so make sure you’re using a compatible one that doesn’t cover the sensor.

Does temperature affect iPhone screen brightness?

Extremely hot or cold conditions can affect your iPhone’s performance, including screen brightness. Try to use your iPhone in recommended temperature ranges.

Is it possible to completely disable screen dimming on an iPhone?

While you can adjust settings to minimize screen dimming, you cannot completely disable it due to battery and system health protocols.


  1. Check and adjust Auto-Brightness settings.
  2. Modify Auto-Lock settings to prevent the screen from dimming too quickly.
  3. Disable Low Power Mode to maintain screen brightness.
  4. Update iOS to ensure proper functioning and fix any software-related dimming issues.


In essence, your iPhone screen dimming can be attributed to a handful of features designed to optimize your user experience and prolong your device’s battery life. Whether it’s the Auto-Brightness adjusting to your environment, Low Power Mode kicking in to save juice, or the Auto-Lock function preserving your screen’s integrity, each feature has its purpose. However, if you’re finding the dimming to be more of an annoyance than a convenience, there’s plenty you can do to take back control.

By understanding the settings and options available to you, and keeping your software up to date, you can customize your iPhone’s behavior to better suit your needs. Remember, while some dimming is automated for your benefit, your preferences come first, and with a few tweaks, you can ensure your screen’s brightness is just right for you. If you’ve tried all the tips and tricks and your screen is still acting up, it might be time to consult with the experts at an Apple Store. Who knows, this little screen dimming quirk might just lead to discovering new features you never knew your iPhone had!

Get Our Free Newsletter

How-to guides and tech deals

You may opt out at any time.
Read our Privacy Policy