Why is my iPhone screen dimming? And further how to settle it quickly and efficiently? In principle, both problems are complementary to each other. Figure out the reason for iPhone screen dimmed, then it is not far from a successful solution to the problem. So then what does the issue actually result from? On the basis of studies and analysis, it is found that iPhone software glitch and wrong configuration are largely to blame. In view of such causes, this paper gives 6 viable solutions to work you out of it.
- Solution 1: Fix iPhone Screen Dimming without Data Loss
- Solution 2: Disable Auto-Brightness
- Solution 3: Turn off Reduce Transparency
- Solution 4: Toggle off Zoom
- Solution 5: Reset All Settings
- Solution 6: Check Ambient Light Sensor
Part 1. Employ Joyoshare UltFix with No Data Loss
As a matter of fact, it is preferable to take advantage of a technical program to assist you while having some problems that you do not know why. In this way, not only can the problem be overcome but also avoid further issues caused by improper solutions. So here, to work out the iPhone screen dimmed matter, what the most expedient measure is to make use of Joyoshare UltFix iOS System Recovery. The biggest standout feature of such an intelligent repair tool is that it can easily have assorted iOS issues resolved without damaging any data on your iDevice.
Naturally, it does more than that. More narrowly, it carries a free function with which you are able to make your iPhone enter/exit recovery mode at any time you want. In addition, the built-in standard mode and advanced mode make it more flexible to repair issues. That standard mode is designed to troubleshoot usual iOS problems like iPhone screen dimming, iPhone black screen, iPhone screen won't rotate, and so on. As far as advanced mode, it could serve you while coming across serious issues. The steps to operate it are as follows.
Key Features of Joyoshare UltFix iOS System Recovery:
Repair more than 30 sorts of iOS problems
Compatible with almost iOS devices and iOS 13
Can do the same on iPhone/iPad/iPod and Apple TVs
Get iPhone screen keeps dimming solved without losing data

Step 1: Install Joyoshare UltFix iOS System Recovery and open it to start. Afterwards, please use a lightening USB to connect your iPhone with the computer. When iPhone is recognized, just go to the next step with the "Start" icon;

Step 2: In this step, you ought to choose standard mode to repair your iPhone issue. Like that, no iPhone data will be lost in the repair process. Once done, click on "Next" to go on;

Step 3: On the screen, touch your iPhone model and then follow the instructions to set your iPhone into recovery mode. Or you can also put it into DFU mode if your iPhone fails to enter recovery mode;

Step 4: When the program detects your iPhone in recovery/DFU mode, it is time to tap on "Download" to download the firmware package and verify it. Do remember to confirm all the information shown on the screen about your iPhone before downloading the firmware;

Step 5: The last thing to do is hitting on "Repair" to let Joyoshare UltFix unzip the firmware package and fix your iPhone screen dimming issue.

Part 2. Turn off Auto-Brightness
There are moments when iPhone screen dimmed problem is contributed by auto-brightness. You know, the auto-brightness function on iPhone is enabled by default, which will make the iPhone brightness move as the ambient light changes. Supposing that you have been in bright light for some time, then you might regard the dim iPhone screen as a problem. But actually, it is a normal phenomenon. To distinguish it, you can go where the light is dimmer to see if iPhone screen brightness changes or not. If so, you may disable "Auto-Brightness" on your iPhone to fix the issue according to the following content.

Step 1: Please get into "Settings" and then scroll down to "General";
Step 2: After that, choose "Accessibility" and next tap on "Display Accommodations";
Step 3: Finally, you just need to find and click "Auto-Brightness" to turn it off.
Part 3. Toggle off Reduce Transparency
Such an iPhone feature is conducted to improve contrast by reducing transparency and blurs on some background to increase legibility. Although it takes you gigantic convenience at some given moment, it is tested that it is one of the possible reasons for iPhone screen dimmed trouble. When nothing has changed after turning off auto-brightness, you may try to disable "Reduce Transparency" to get a positive result.

Step 1: Similarly, visit "Settings" and then to "General";
Step 2: Afterward, locate and tap on "Accessibility". In "Accessibility" interface, please choose "Increase Contrast";
Step 3: Now, simply tap to disable "Reduce Transparency" if it is on.
Part 4. Turn off Zoom
Turning off zoom on your iPhone is also a great method to finish off the iPhone screen dimmed problem. You might be feeling confused about why handy function on iPhone will bring you certain problem. This is because every configuration and setting is critical for sophisticated devices like iPhone. Maybe enabling zoom conflicts with some settings, which results in the dim iPhone screen. In that case, easily disabling zoom can address the problem. To do it, first you need to open "Settings" - choose "General" - tap "Accessibility" - touch "Zoom". If it is on, you just hit it to disable.

Part 5. Reset All Settings
As has been noted, a conflict between settings is one of the primary factors of iPhone screen dimming trouble. In case the above operations can not set this issue right, then you have got to consider resetting all settings on your iPhone. Doing so is going to eliminate a few fault settings that bring about such an issue. The following is the way to finish it.

Step 1: Please go to "Settings" on the home screen and followed by "General";
Step 2: Next, you should choose and tap the "Reset" option;
Step 3: Now, just touch "Reset All Settings" and it may ask you to enter passcode to confirm it. Your iPhone settings will be reset in a minute.
Part 6. Check Ambient Light Sensor
Be vigilant for the malfunctioning ambient light sensor. As an indispensable part of iPhone, ambient light sensor is used to help to adjust your iPhone screen brightness depending on the ambient light. You can imagine that if it fails to work on your iPhone, so then there will be problems with iPhone screen brightness, for one, iPhone screen keeps dimming. In the event of this is the case, you can clean the iPhone screen because it is possible that dirt and dust on the screen do not allow it to work well. If useless, you had better repair it in the Apple store.
