The question of how many inches is the diagonal of the screen of the Xiaomi Mi 9T smartphone is one of the most frequent among users considering buying this device or choosing protective accessories. At first glance, it may seem that finding this figure is elementary, but inches alone are not enough to fully assess the ergonomics and multimedia capabilities of the gadget.
Xiaomi Mi 9T (also known as Redmi K20) has become a benchmark in its segment thanks to the combination of compactness of the case and a large display. Engineers managed to minimize the bezels, which allowed you to fit an impressive area of the image in the palm of a medium size. In this article, we will analyze in detail not only the 6.39 inches claimed by the manufacturer, but also what lies behind these figures in real use scenarios.
When choosing a cover, a protective glass, or simply evaluating the convenience of reading text from close range, knowing the exact parameters of the screen is critical. We will analyze the technical specifications, compare them with competitors of the same period and give recommendations for adjusting color reproduction. This will allow you to make the most of your potential. AMOLED-matrix installed in this device.
Exact diagonal parameters and physical dimensions
The official specification says that the display diagonal Xiaomi Mi 9T is exactly 6.39 inches. If you translate this value into the usual metric system, we get about 16.23 centimeters. However, it is important to understand that this distance is measured from the angle to the angle of the visible region of the pixels, and not the entire body of the device. The physical dimensions of the smartphone are 156.7 mm in height and 74.3 mm in width, which makes it quite convenient for use, despite the impressive diagonal.
One of the key features that influences size perception is the absence of necklines and holes in the matrix itself. Unlike many modern models, where the front camera occupies usable area, it uses a retractable mechanism, which means that the claimed 6.39 inches is 100% of usable space for content. You will not lose a millimeter when watching 16:9 video or playing games with wide format support.
The screen aspect ratio is 19.5:9, which is the standard for today’s high-end smartphones, and this elongation allows you to comfortably hold the device in your hand, covering the sides with your fingers, while maintaining high information capacity vertically.
Matrix technologies and image quality
The 6.39-inch figure hides Samsung’s cutting-edge Super AMOLED technology. It’s not just a marketing name, it’s a deep black guarantee, because each pixel in the array is individually lit. When the screen displays black, the corresponding pixels are completely turned off, saving battery power and providing endless contrast, especially when using dark interface themes or watching a movie in the dark.
The display resolution is 2340 × 1080 pixels (Full HD+). At a diagonal of 6.39 inches, the pixel density reaches 403 ppi (pixels per inch). For the human eye, this means that at a normal viewing distance (30-40 cm), the image structure is completely indistinguishable - the picture looks absolutely smooth, without the effect of "ladder" on fonts or icons. Color coverage covers 100% of the DCI-P3 space, which makes the Xiaomi Mi 9T an excellent tool for mobile photo retouching.
An important aspect is the support of the technology Always On Display. Thanks to the properties of AMOLED, the smartphone can display the time, notifications and battery status, consuming a minimum amount of energy, since only a small fraction of the pixels are burning.
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To maximize battery power savings on AMOLED-Always use dark theme and black wallpaper in the screens, which allows you to turn off the backlight of a large part of the matrix, extending the battery life to 20%.
Update frequency and sensory properties
The standard screen refresh rate in the Xiaomi Mi 9T is 60 Hz. While this parameter may seem modest against the background of modern 90 Hz and 120 Hz panels, for AMOLED-matrixes of that period, it was the optimal balance between smoothness and power consumption. Visually, the animations of the MIUI interface look smooth due to system optimization, and in games, the absence of excessive load on the GPU allows you to maintain a stable FPS longer without trottling.
The touch layer has a 240Hz polling rate. This means that the screen reads the finger position 240 times per second. For ordinary users, this is imperceptible, but in dynamic shooters like PUBG Mobile or Call of Duty Mobile, this gives a tangible advantage in reaction speed.Aiming and shooting become more responsive, minimizing the delay between touch and action on the screen.
It is worth noting the presence of the protective glass Corning Gorilla Glass 5. It protects the matrix from scratches and damage when falling flat, but does not make the screen indestructible. The mechanical strength of the glass is high, but point bumps with sharp objects (keys in the pocket, sand) can leave traces.
Display settings in MIUI
Xiaomi provides a wide range of tools to calibrate your image to your preferences. Going to the Settings → Screen menu, you will find several color scheme modes. The standard Bright mode saturates colors, making the picture more juicy, which most users like when they first turn on. However, for photo or long reading, you better switch to Standard or Contrast mode.
The function deserves special attention. DC Dimming. Low brightness levels. AMOLED-screens often use PWM (pulse-latitudinal modulation) to adjust the glow, which in some people causes eye fatigue or headache. DC Dimming (often hidden in the “Developers” menu or called by code in the “bell ringer”) changes the principle of adjustment to change the voltage, making using the phone at low brightness more comfortable.
You can also adjust the color temperature in Kelvin, you can shift the balance to warmer shades to reduce the load on the eyes in the evening, or to colder ones for clearer text perception in the daytime, and the system also offers a Read mode, which translates the interface into a monochrome black and white look.
☑️ Checking the screen quality after purchase
Comparison with competitors and analogues
To understand how good the Xiaomi Mi 9T screen is, you need to compare it with direct competitors released during the same period. The table below compares the key display characteristics of popular mid-range and flagship models in 2019.
| Smartphone model | Diagonal (inches) | Type of matrix | Permission |
|---|---|---|---|
| Xiaomi Mi 9T | 6.39 | Super AMOLED | 2340 × 1080 |
| Honor 20 | 6.26 | IPS LCD | 2340 × 1080 |
| Realme X | 6.53 | Super AMOLED | 2340 × 1080 |
| Samsung Galaxy A50 | 6.40 | Super AMOLED | 2340 × 1080 |
As you can see from the comparison, Xiaomi Mi 9T It's in the middle of nowhere, and it offers more screen space than the Honor 20, and it uses a better quality. AMOLED-technology IPS, Compared to the Realme X, the Mi screen is a better contrast. 9T slightly less, but this is offset by higher pixel density and better viewing angles typical of Samsung panels.
The main advantage over many competitors, including some Samsung models of the time, is the lack of an intrusive brand logo in the bottom corner of the screen ("the chin").Symmetrical bezels on the top and bottom create a sense of premium device that is rarely found in this price range.
Why do some people have a yellow screen?
Problems and features of operation
Despite the high quality, owners may have questions related to the peculiarities of the work. AMOLED-One potential problem is that pixels burn out when static images are displayed at maximum brightness for a long time. However, modern Xiaomi algorithms include a pixel shift function, which imperceptibly shifts the picture slightly to the eye so that the load is evenly distributed.
Another nuance is sensitivity to low-frequency flickering (LFM), which is why people with hypersensitive eyes may notice a pulsation of the screen, especially at brightness below 30%, and in such cases, it is recommended not to reduce the brightness programmatically, but to use the DC Dimming feature mentioned earlier, or simply increase the brightness level to a comfortable value.
⚠️ Note: When you stick protective glass on Xiaomi Mi 9T Consider the curved edges of the display (2.5D). Cheap flat glass may not stick around the edges or have a rainbow effect. Use Full Glue or hydrogel films that better replicate the geometry of the screen.
⚠️ Warning: Do not use aggressive chemicals (alcohol, acetone, solvents) to clean the screen.This can damage the oleophobic coating, causing the finger to slide worse and the surface to appear more fatty spots. Use only microfiber and special sprays for screens.
Final recommendations for the selection of accessories
The understanding that the diagonal is 6.39 inches and the screen itself has rounded edges dictates certain rules when choosing accessories. Cases should be compatible with the Mi 9T (or K20) model, since the location of the cameras and connectors is unique. Universal 6.4 inch cases may not fit the geometry of the cutouts.
The best way to protect the screen is 3D-glass that covers the entire curved surface. 2D-The glass will have unprotected areas around the perimeter, where dust and dirt will be clogged. When installing such glass, it is important to carefully degrease the surface and use a guide frame, if it comes with a kit, to avoid skewing.
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Xiaomi Mi 9T It has one of the best screens in its class thanks to the combination. AMOLED-matrix, no cutouts and high pixel density, making it relevant even years after the release.