Xiaomi Mi 9: The exact screen size in inches and why it matters to the user

When it comes to choosing a smartphone, screen size is a key consideration. The Xiaomi Mi 9, launched in 2019, is still a hot choice thanks to its balanced specs and affordable price. But how many inches does its display have? The answer to this question is important not only for usability, but also for accessories, from protective glasses to covers.

In this article, we will not only look at the exact dimensions of the Mi 9 screen, but also compare them with other popular models of the lineup, explain how size affects the interaction experience, and give practical tips for use. If you are planning to buy or already own this smartphone, the information below will help avoid typical mistakes - for example, when choosing the wrong size case or setting the display.

It’s worth noting that the screen size of the Mi 9 is exactly 6.39 inches, but that’s just the tip of the iceberg. It’s more important to understand how the physical dimensions of the case, the screen resolution and the pixel density are related – these parameters determine how comfortable the device will be in everyday life.

Official screen characteristics Xiaomi Mi 9

The manufacturer claims that Xiaomi Mi 9 is equipped with AMOLED-This is a 6.39-inch display, which refers to the visible area of the screen, not including the bezels. Compared to the predecessor, the Mi 8, which had a diagonal of 6.21 inches, and the successor, the Mi 10, had a 6.67 inch diagonal.

Key technical parameters of the display:

• 📏 Diagonal: 6.39 inches (16.23 cm)
• 🔍 Permission: 2340 × 1080 pixels (Full) HD+)
• 🎨 Type of matrix: Super AMOLED (Samsung E4)
• 🔄 Aspect ratio: 19.5:9
• 💡 Brightness: up to 600 nits (maximum)
• 🎯 Pixel density (PPI): 403

The feature of this screen is support for HDR10 technology, which provides a wider dynamic range and rich colors. However, it is worth considering that the real area of the display may differ slightly due to the rounded corners of the display (the so-called "waterdrop" cutout for the front camera).

Comparison with other Xiaomi models: Mi 9 vs Mi 9T vs Mi 9 Pro

To better understand how big the screen is, the Mi 9 compares it to other flagships in the lineup, and here is a table with key display parameters:

Interestingly, the Mi 9, Mi 9T and Mi 9 Pro have the same screen size but differ in design: the Mi 9T has a retractable front camera, and the Mi 9 Pro has support for faster charging, while the Mi 10 received a larger screen to 6.67 inches, but with a lower pixel density (386 PPI vs. 403 PPI in the Mi 9).

⚠️ WARNING: When buying a protective glass or case for Xiaomi Mi 9, don’t confuse it with Mi 9T — Despite the same diagonal, the location of the camera and cutouts in these models are different!

How screen size affects user experience

The 6.39-inch diagonal is a compact flagship, the gold standard for those who want a large screen but are not prepared to put up with the bulkiness of the device.

• ✅ One-handed convenience: With rounded edges and relatively narrow bezels, the Mi 9 can be comfortably held and operated with one hand (with a palm size of 17 cm).
• ✅ Multimedia: The perfect balance for watching video (the 19.5:9 aspect ratio is close to the standard 16:9 but with smaller black bars).
• ✅ Games: AMOLED-matrix with a refresh rate of 60 Hz (in some firmware you can overclock to 72 Hz) provides a smooth picture in games.
• ❌ Autonomy: The larger screen consumes more power, so it may need to be recharged by evening when used actively.
• ❌ Cases: Not all universal cases are suitable due to the camera cutout and rounded corners.

By comparison, smartphones with 6.7 inches or more screens (like the Redmi K50 Ultra) are already harder to use with one hand, but offer a more immersive experience when watching movies. The Mi 9 remains a versatile option for most tasks.

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If you think the text on the screen is too small, enable zoom in settings: Settings → Screen → Text size and display. The optimal value for the Mi 9 is 110-120%.

How to measure the screen diagonal yourself

If you are in doubt about the manufacturer's specifications or want to specify the screen size after changing the display, you can measure the diagonal yourself.

• 📏 Line or roulette (preferably metallic for accuracy).
• 📱 Clean screen of the smartphone (without a case).
• 🔍 Magnifying glass (optional, for precise definition of boundaries).

Instructions:

1. Turn on a white image on the screen (for example, open an empty document in Google Docs) to clearly see the boundaries of the display.
2. Apply a ruler from one corner of the visible area of the screen to the opposite (diagonally).
3. Record the result in centimeters and translate into inches, dividing by 2.54.

Remove the cover and protective glass

Use a ruler with a millimeter scale

Measure only the visible area (without frames)

Repeat measuring 2-3 times for accuracy-->

For example, if you get a value of 16.2 cm, the diagonal in inches will be 16.2 / 2.54 ≈ 6.38 inches, which corresponds to the official data. The error of 0.01-0.03 inches is considered normal.

⚠️ Attention: Do not confuse the screen diagonal with the dimensions of the case! Full dimensions Xiaomi Mi 9 — 157.5 × 74.7 × 7.6 The screen only occupies a part of the area.

What accessories are suitable for a 6.39-inch screen

When choosing accessories for the Mi 9, it is important to consider not only the diagonal, but also the design features. For example, protective glasses should have a cutout for the front camera and sensors, and cases should accurately repeat the shape of the body, taking into account the triple main camera.

Recommended types of accessories:

• 🛡️ Protective glass: Optimal to choose models with coating 9H And the oleophobic layer (from prints) is like Spigen Glas.tR. EZ Fit or Nillkin H+ Pro.
• 📱 Cases: For the Mi 9, covers labeled "For Xiaomi Mi 9" or "6.39 inches (2019)" are suitable. Avoid universal cases - they rarely fit perfectly.
• 🔋 Power Bank: Given the battery capacity of 3300 mAh, an external battery of 10,000 mAh is recommended (for example, Xiaomi Mi Power Bank 3 Pro).

When buying online, be sure to check compatibility in the product description. For example, cases for the Mi 9T will not be suitable for the Mi 9 due to different camera location, despite the same screen size.

Frequent Mi 9 screen problems and how to fix them

Despite the high quality of the AMOLED-matrix, owners of Xiaomi Mi 9 sometimes face problems.

If the problem is software related, try resetting the screen to factory settings: Settings → System → Resetting → Resetting screen settings. This will help to return the factory color temperature and brightness.

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AMOLED-screens are sensitive to static images. To avoid pixel burnout, turn on Screen Shift in the developer settings (Settings) → The phone. → Version. MIUI (tap 7 times) → For developers → Shifting the screen).

FAQ: Answers to popular questions about the screen Xiaomi Mi 9