Modern. OLED-The displays installed in Xiaomi’s flagship and mid-range smartphones offer incredible brightness and color saturation, but have one significant drawback: When the brightness level drops below 30-40%, many panels are switching to a power management method known as PWM (PWM), It's a problem that causes a flicker that's invisible to the eye, but it's tiring for the brain. DC Dimming, which changes the voltage of the pixels instead of using frequency pulses, making working with the device in low light much more comfortable.
Owners of MIUI shell-based devices and the new HyperOS often have difficulty finding this setting, as it can be hidden in the engineering menu or activated only through hidden codes. In this article, we will detail all known ways to activate the feature, including methods for global and Chinese firmware versions, and explain why in some cases this mode may not be available by default.
Activating DC Dimming not only reduces the strain on the optic nerve, but can also have a positive impact on the autonomy of the device in certain use cases. However, before making changes to the system settings, it is important to understand the way the display of your particular smartphone works, whether it is Xiaomi Mi 11, Redmi Note 12 Pro or more recent models of the Xiaomi 13/14 series.
The principle of operation and difference between the PIM
To understand the need to turn on this mode, you need to understand the physics of the process. OLED-panels do not know how to smoothly change the brightness of the diodes, so they use PWM (PWM). The screen turns on and off quickly: the shorter the on pulse, the dimmer the image appears. At high brightness, the frequency of these switches is high and invisible, but when reading at night, the frequency can drop, causing the effect of a "stroboscope".
Technology DC Dimming (Direct Current) works differently. It changes the current through the LEDs, allowing them to glow constantly, but at different intensities. It completely eliminates flickering. But it has a technical nuance: at very low currents, color reproduction. OLED-matrixes can be distorted, there are "floating" colors or uneven illumination.
That's why manufacturers often hide this feature or force it to turn on. Xiaomi's algorithms try to find a balance by using software color correction with active DC Dimming to minimize visual artifacts. For users sensitive to flickering, turning on this mode is not just a convenience, but a necessity.
⚠️ Note: Some models with 120 Hz refresh rate activate DC Dimming can force the frequency to 60 Hz or cause micro-latency in the interface.
Search for function in standard MIUI and HyperOS settings
In recent firmware versions, Xiaomi has started to move the switch from the hidden menus to the standard interface, but the location may vary. First of all, check the section related to vision protection, since the logical function belongs to this category. The path may differ depending on the regional version of the software.
Open your smartphone settings and go to Screen or Display and Brightness. Here you need to find Eye Care. Inside this menu, in addition to the standard blue filter, you can have an Anti-Flicker or DC Dimming switch. On some devices, it is hidden under the "Additional Settings" button or only appears after reading mode is turned on.
If the standard menu doesn't have a switch, try searching by settings. Type in DC or flicker. The system will highlight the item if it's software-available for your model. It's also worth checking Advanced Settings → Security and Privacy → Vision Protection, where older versions of MIUI often hid this option.
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If the DC Dimming switch is grey and inactive, try first to reduce the overall brightness of the screen with a slider to a minimum, and then press the activation button.
Activation through engineering menu and codes
When the standard interface doesn't offer the right option, engineering codes come to the rescue. This is the most common way for devices that come with global firmware, where functionality can be cut down compared to the Chinese version.
Enter the following code in the dial box: ##777### or ##3388##. Once the last digit is entered, the hidden Anti-flicker menu should automatically open. If the code does not work, try the universal engineering code ##4636##, then select Display (if available) or Testing. In the menu that opens, find DC Dimming and switch it to Enabled.
If nothing happens when you enter the code, your Android version or security patch may close that login, so go to the next section of the manual, which describes the methods for advanced users.
☑️ Pre-activation check
Use of activation applications
If system methods don't work, you can use third-party software that creates a software layer on top of the system. These applications don't require root rights, but they may have limitations. The most popular and proven tool is the DC Dimmer app from the Google Play Store.
Once installed, the app will request permission to Overlay over other windows and access special features, which is necessary so that the program can darken the screen by software, mimicking the work of the DC Dimming hardware. Although it is not a real DC Dimming hardware, the PWM reduction effect is achieved by overlaying a translucent black layer, which also removes flicker.
For deeper integration, there are applications that require activation via ADB. Once you connect your smartphone to your computer and execute the adb shell pm grant command, you get full control over the hidden display settings. This allows you to enable native DC Dimming even where it is hidden by the manufacturer.
⚠️ Note: When using darkener applications (software dimming) AMOLED screens may experience a decrease in contrast and a change in color balance, as black color on the screen OLED It is formed by the absence of pixel glow, not by software dimming.
Comparison of modes: what is better for the eyes
Users often wonder if it is worth sacrificing image quality for eye health. Below is a table that will help you weigh the pros and cons of using different backlight modes on Xiaomi and Redmi devices.
| Parameter | Standard PWM (PWM) | DC Dimming | Software blackout |
|---|---|---|---|
| Screen flickering | High (at low brightness) | Absent. | Absent. |
| Color rendering | Reference | Possible distortions | Reducing contrast |
| Effect on the eyes | High fatigue | Minimum | Low. |
| Energy consumption | Standard. | A little higher at low brightness | It doesn't change. |
As you can see from the table, DC Dimming is better at vision safety, but it's worse at color rendering. If you're working with photos or videos, you'd better use standard mode or brighten up. If you're reading books and social media at night, you should definitely switch to flicker protection.
Xiaomi’s current flagships (such as the 13 and 14 series) use high-frequency technology. PWM (1920 Hz and above. In such screens, flickering is so frequent that the human eye hardly detects it, and the need for a glimmer is not very clear. DC Dimming disappears by itself. Check your screen specifications in the Device Info app HW.
Why can DC Dimming cause floating colors?
Frequent problems and their solution
Once the feature is turned on, users may encounter a number of artifacts, the most common being "noise" in the image or uneven lighting around the edges of the screen. OLED-And you can use the dc panels, and usually after 10 to 15 minutes of use, your eyes will adapt, and you won't notice these defects.
Another problem is the inability to activate the mode on the locked bootloader or, conversely, only with the unlocked one. In some cases, you need to activate debugging over USB to access the engineering menu. To do this, go to About Phone, press 7 times on the MIUI version, then turn on Debugging over USB in Advanced Settings.
If the phone starts to heat up or discharge faster after switching on DC Dimming, try not to keep this mode active all the time. Use automation scenarios or just turn it on for reading only in the dark. Constant operation in DC Dimming mode can slightly increase the load on the display power controller.
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The big takeaway: DC Dimming is a trade-off between eye health and perfect color reproduction. Use it situationally, in low light.