Many iPhone 12 users notice that the screen dims automatically, sometimes even when the brightness is set to maximum. This phenomenon can be surprising, especially when it interferes with reading, watching videos, or using certain apps. It is not a hardware defect but an integrated feature to optimize visual comfort and energy consumption.
Why does the iPhone 12 screen dim automatically?
Several functions integrated into iOS can cause this automatic dimming.
Automatic brightness
iOS adjusts the brightness according to ambient light thanks to the brightness sensor.
• In a dark environment, the screen can automatically dim to protect the eyes
• In a bright environment, the screen increases to improve visibility
This function is enabled by default and dynamically adapts to light conditions.
True Tone
The True Tone function adjusts the screen colors and brightness for a natural rendering.
• It changes the color temperature according to ambient light
• The screen may appear darker or warmer depending on the environment
True Tone is designed to reduce eye strain but can give the impression of untimely dimming.
Power saving mode
The power saving mode automatically reduces certain performances to extend battery life:
• Decrease in maximum brightness
• Reduction of certain animations and visual effects
• Adjustment of screen refresh rate
If the iPhone is in power saving mode, the screen naturally dims.
How to disable automatic dimming?
Several options allow you to control brightness and disable dimming.
Disable automatic brightness
To prevent the screen from adjusting automatically:
1. Open Settings
2. Go to Accessibility
3. Select Display & Text Size
4. Disable the Auto-Brightness option
Once disabled, the brightness will remain constant, even if the ambient light changes.
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Disable True Tone
If True Tone alters the perception of brightness:
1. Open Settings
2. Go to Display & Brightness
3. Disable True Tone
This step prevents the phone from adjusting the color temperature, providing a stable screen.
Check power saving mode
Power saving mode can dim the screen:
1. Open Settings
2. Select Battery
3. Check if Low Power Mode is enabled
4. Disable it to restore maximum brightness
Power saving mode can also be quickly disabled from the Control Center.
Manually adjust brightness
For full control:
• Swipe down from the top right corner to open the Control Center
• Slide the brightness slider to the desired level
• Hold the slider until the screen reaches the desired brightness
This method works even if automatic brightness remains enabled.
Specific cases to check
Sometimes, other settings or features can influence brightness.
Accessibility and contrast
• The Reduce White Point option may be enabled in Accessibility
• Color filters or automatic dark mode can give the impression that the screen is dimming
Check these options if the problem persists after disabling True Tone and automatic brightness.
Third-party applications
Some applications can adjust brightness independently:
• Reading or video apps
• Gaming apps with their own screen settings
• Blue light filtering apps
Closing or checking the settings of these apps can resolve the issue.
