iPhone Brightness Keeps DimmingWhen auto-brightness is turned on, your iPhone uses the ambient light sensor to adjust brightness levels based on the light around you. And hence, it lowers the brightness and dims down the screen in dark environments.iPhone Brightness Keeps Dimming

So if your iPhone screen dims on its own, the auto-brightness feature could be the culprit. Head to Settings > Accessibility > Display & Text Size. Here, scroll to the bottom and turn off the toggle for Auto-Brightness.

You can also control the auto-brightness using Siri. Here are two ways to enable or disable auto-brightness on iPhone.

Disable TrueTone

iPhone Brightness Keeps Dimming – With iPhone 8 and onwards, Apple included the TrueTone feature that could automatically adjust the display brightness and color temperature to make colors appear consistent in different places.

It doesn’t always work perfectly and may cause frequent fluctuations in the iPhone screen brightness and colors. So, try disabling TrueTone to see if it solves the issue.

  1. Open Settings on your iPhone.
  2. Go to Display and Brightness.
  3. Here, turn off the toggle for TrueTone.

OR, toggle the iOS control center, long-press the brightness slider, and turn off the True Tone feature.

Check the Night Shift Feature

Similarly, Night Shift is another feature that turns your screen slightly warmer to help reduce eye strain. While it has very little to do with brightness, it might make your screen appear dimmer than usual.

  1. Open Settings on your iPhone.
  2. Go to Display and Brightness.
  3. Click on Night Shift.
  4. Turn off both options.

OR, open the control center, tap and hold the brightness slider, and turn off the Night Shift feature.

iPhone Brightness Keeps Dimming – Turn Off Low-Light Zoom Filter

The most common reason behind the darker or dim screen on iPhone is the low-light Zoom filter in settings. If enabled accidentally, follow the steps below to turn it off:

  1. Open the Settings on your iPhone.
  2. Scroll down and click on Accessibility > Zoom.
  3. On the next screen, see if the feature is turned on.
  4. If yes, click on Zoom Filters at the bottom.
  5. If it’s set to Low-Light, change it to None.

Disable Low Power Mode

The Low Power mode on iPhone, when enabled, does several things to save battery power. This also includes reducing your screen brightness. So, try turning off the low power mode if you feel that your iPhone’s screen is dimmer than usual.

  1. Open Settings on your iPhone.
  2. Go to the Battery section.
  3. Disable the toggle for Low Power Mode.

OR, open your iOS control center, and tap the Low Power mode (battery) icon.

Is Your iPhone Overheating?

High ambient temperatures like using the iPhone under the direct sun can cause it to heat up. If it gets too warm, it may try to regulate the temperature by slowing down or stopping charging, throttling performance as well as dimming down the display.

So, if your iPhone has reduced its screen brightness automatically, check if the phone is hot. To cool it down, turn it off or stop using it for a while and move it to a cooler environment.

Using the iPhone in very hot conditions can permanently shorten battery life. So, try to keep it in the ideal temperature range. If your battery is already worn up significantly, here are some handy tricks to save battery on iPhone.

Other Ways to Stop iPhone from Reducing Brightness On its Own

If you have followed the above solutions yet nothing seems to be working, there are some other options you can try:

  • Restart your iPhone to clear out any temporary glitches.
  • Increase the Auto-Lock Time in Settings > Display and Brightness.
  • Update your iPhone to the latest version in Settings > General > Software Update.
  • Reset to Factory Settings, but before you do that, make sure to backup your iPhone.
  • Contact Apple Support. Visit an authorized service center and let them diagnose the phone to know the exact cause.

Set Brightness Levels Manually

By default, your iPhone automatically tunes its screen’s brightness depending on your surroundings. It will be at its highest levels if you’re out on a sunny day, for instance.

However, if you don’t like this feature, you can turn it off and tweak the brightness yourself. To do this, open the “Settings” app on your iPhone and enter the “Accessibility” menu. In Accessibility, tap “Display & Text Size.”

In “Display & Text Size,” scroll to the bottom and toggle the “Auto-Brightness” option by flipping the switch beside it. Your iPhone will no longer alter the brightness levels automatically. You’ll have to manually do it by adjusting the brightness bar in Control Center.

Also Read: How to Fix Wi-Fi calling on iPhone not working?

Switch off Attention-Aware Features

If you own an iPhone with Face ID, your phone may be dimming the screen when it thinks you’re not looking at it to preserve battery life. To make sure that this smart feature is not messing up your phone’s screen brightness, try switching it off for a day.

You can do that by heading into Settings > Accessibility > Face ID & Attention and disabling “Attention-Aware Features.”

Troubleshoot the True Tone Option

Recent iPhones (iPhone 8 and above) have the ability to regulate their display’s color temperature and intensity depending on your room’s ambient light. This is called “True Tone.” But it can be a hit or miss, especially if you’re constantly moving around. By submitting your email, you agree to the Terms of Use and Privacy Policy.

Turn off True Tone to keep your displays look consistent as well as to prevent them from fluctuating. To do so, open Settings and navigate to Display & Brightness. Then, tap the switch beside “True Tone” to disable it.

Disable Night Shift

Night Shift is another setting that could be hampering your screen’s brightness. It turns your screen’s colors warmer so that they’re easier on your eyes at night. But when it comes into effect, your phone’s screen might also appear to be dimmer than normal.

You can deactivate Night Shift to see whether it solves your phone’s brightness snags. Head into Settings > Display & Brightness and tap “Night Shift.”

In the “Night Shift” settings, turn off the switch beside the “Scheduled” option to opt out of the “Night Shift” mode.

Extend How Quickly Your iPhone Auto-Locks

When your iPhone is idle, it automatically turns off its screen and locks itself to save power. Right as it’s about to do that, it also dims the screen to let you know that it’s about to turn off. But if your screen is dimming too often, you can extend the time that your iPhone takes to lock.

Go to Settings > Display & Brightness and tap “Auto-Lock.” In the menu that appears, select the new “Auto-Lock” time period. You can also choose the “Never” option if you never want your iPhone to lock on its own. After that, exit Settings, and hopefully, your issue will now be fixed.


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