Xiaomi and Redmi smartphone owners often face the need to know the exact characteristics of their device, in particular, the diagonal of the display and its resolution. This may be necessary for the selection of protective glass, adjusting the quality of the video or simply out of curiosity about the technical details of the gadget. Standard methods of verification may vary depending on the version of the shell MIUI or HyperOS.
There are several proven ways to get reliable information about display parameters: you can use built-in system settings, special engineering codes or third-party applications for deep diagnostics. It is important to understand the difference between the physical diagonal in inches and the actual number of pixels that affect the clarity of the image.
In this article, we will go into detail on each method, explain how to read the technical specifications, and help you determine exactly which screen is installed on your smartphone. Don’t rely on marketing model names alone, as the same device may come with different arrays in different regions.
Use of built-in system settings
The easiest and safest way to find out basic information about the display is to go to the settings menu of the phone itself. In the MIUI and HyperOS shells, the developers have provided a convenient section where the main characteristics are displayed, and to do this, you need to go to Settings and select About phone.
Here you'll see some general information, but for detail, you often need to click on the MIUI version or the model name string several times to activate the extended menu. However, the standard interface doesn't always show the exact resolution in pixels, limited to just the diagonal.
If you want more accurate data, such as pixel density (PPI) or precise resolution, look at Advanced Settings → Screen Resolution. In some Redmi models, the system even allows you to switch between matrix modes to save charge or improve quality.
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Before changing the screen resolution, make sure you understand the consequences: lowering the resolution can increase battery life, but make fonts less clear.
Note that in newer versions of firmware, Xiaomi hides some technical details from the average user. If the settings menu does not have the necessary numbers, you will have to use other diagnostic methods.
Checking through the engineering menu and codes
For users who need detailed technical data, there is access to a hidden engineering menu, a powerful diagnostic tool that allows you to check not only the size of the screen, but also its performance, the presence of broken pixels and touch properties.
To get into the testing menu, open the Phone app and type a special code. For most Xiaomi devices, the code ##64663## or ##4636## is current. Once you enter the last character, the menu will open automatically.
⚠️ Warning: Be careful in the engineering menu. Do not change settings that you do not understand, as this may lead to malfunctioning of the system or calibration of sensors.
In the list that opens, select the item associated with the display (often called Version or Display), which will show the matrix model, its resolution and other technical information, and this is the most reliable source of data, since it is read directly from the device controller.
What if the code doesn't work?
You can also run a screen color test through this menu to check the lighting uniformity and the absence of defects, which is especially useful when buying a used device or after replacing the display at the service center.
Third-party diagnostic applications
If the built-in tools don’t seem informative enough, specialized apps from the Google Play store will come to the rescue. They provide comprehensive information about the hardware of your smartphone, including the exact model of the processor, the amount of RAM and, of course, the screen parameters.
One of the most popular and reliable tools is the CPU-Z or AIDA64 application, which automatically scans the system and displays data in a user-friendly way, and the Device or Display tab contains the information you want.
- 📱 CPU-Z — shows the exact resolution, pixel density and aspect ratio.
- 📊 AIDA64 — Provides a detailed report on the physical size of the diagonal in inches and centimeters.
- 🔍 Device Info HW — It allows you to know the type of matrix (AMOLED, IPS) screenmaker.
The use of such utilities is useful because they show real resolution, which may differ from the stated in marketing materials due to the camera cutout or rounded edges.
In addition, these apps are often updated and work correctly with new Redmi models coming out in 2026-2026, where specifications may be custom, making them a more versatile tool than static settings menus.
Analysis of specifications by device model
The most accurate way to do this, without having to install software or enter codes, is to search the official specifications of your model online. Knowing the exact name of your smartphone (e.g., Redmi Note 13 Pro), you can find documentation on the manufacturer’s website or in authoritative databases.
It's important to distinguish between the physical size of the diagonal and the usable area of the screen. Modern smartphones have cutouts, holes under the camera or dynamic islets that do not display content. Specifications always indicate the size of the visible area or the full diagonal of the matrix.
Below is a table with popular Redmi models and their screen specifications for quick comparison:
| Model phone | Diagonal (inches) | Permission (pixels) | Type of matrix |
|---|---|---|---|
| Redmi Note 13 Pro+ | 6.67" | 2712 x 1220 | AMOLED |
| Redmi 13C | 6.74" | 1600 x 720 | IPS LCD |
| Redmi Note 12 | 6.67" | 2400 x 1080 | AMOLED |
| Xiaomi 13T | 6.67" | 2712 x 1220 | AMOLED |
And you can use this table to quickly check the data, but remember that in different regions, the same model can have modifications. IMI-device-code.
Determining the real resolution and pixel density
Often, users are not just interested in diagonal, but in pixel density (PPI – Pixels Per Inch), which directly affects the clarity of fonts and images. High PPI means that individual points of the image are indistinguishable to the eye, which creates a “paper” clarity effect.
You can learn this through the diagnostic applications that we talked about earlier, or by calculating it manually, knowing the resolution and diagonal. The formula is complex, but the bottom line is simple: the more pixels per inch, the better the picture quality. For modern Redmi, a value above 350 PPI is the norm.
Also worth considering is the screen refresh rate, which is measured in Hertz (Hz). Standard models run at 60Hz, but many Redmi support 90, 120 and even 144Hz. Check the current frequency in the Settings menu → Screen → Update frequency.
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Pixel density (PPI) is more important for the perception of picture quality than just a large number of megapixels on the screen.
Some applications allow you to artificially change the density of the DPI to increase the size of interface elements, but this requires access rights or connection to the computer.Standard means Xiaomi allows you to change only the font size and image scale.
Frequent problems and ways to solve them
When trying to learn features or change screen settings, users may encounter a number of problems, such as when updating the firmware, some menu items may disappear or move, which is normal practice for MIUI and HyperOS.
If you replace the screen with a non-original one, the software may not correctly determine its parameters or not display brightness and color reproduction information at all, in such cases, you should only trust the data from the engineering menu or third-party tests.
⚠️ Note: Installing custom themes or system modifiers can cause the actual resolution to be cropped or scaled incorrectly, creating the illusion of other characteristics.
Another common problem is AMOLED screens burning out or pixels getting broken, using built-in tests to diagnose or uploading an all-white/black image to the full screen to see defects.