Xiaomi Redmi Note 9: how many inches of screen and detailed matrix analysis

The question of how many inches is the diagonal of the display in the smartphone Xiaomi Redmi Note 9, is one of the most frequent when choosing a device mid-range. Users often look for a balance between the compactness of the case and a large workspace for multimedia.

The 2020 model was a hit in many ways, thanks to its combination of technical specifications and cost, and its engineers have been able to incorporate advanced technology into an affordable form factor, making it attractive to a wide audience, but before buying or using it, it is important to understand not only the physical size, but also the specifics of the matrix manufacturing technology used.

In this article, we will take a closer look at all aspects of the screen of this popular smartphone, which will give you the exact numbers, the difference between the stated and the real parameters, and answers to technical questions that are rarely covered in standard specifications, which will help you to get a complete picture of the visual capabilities of the device.

Basic display parameters and accurate diagonal

To answer the main question, it’s worth noting that the screen size of the Redmi Note 9 is 6.53 inches, a value that is standard for most modern smartphones in this class, providing enough space for viewing videos and working with documents. However, it’s important to understand that the physical size of the visible area can vary slightly due to the rounding of the corners and the presence of a cutout for the front camera.

The resolution of the matrix in this model is 2340 by 1080 pixels, which corresponds to the standard FullHD+. Pixel density reaches 395 dots per inch (PPI), which ensures high definition of fonts and no effect of “grain” even when close inspection, such detail allows you to comfortably read small text and view photos without loss of quality.

DotDisplay, which is being promoted by the manufacturer, involves putting the front camera directly into the screen surface, which minimizes the loss of usable area and maintains the symmetry of the top of the image. Unlike the old bangs, here the black zone is minimal and practically does not interfere with the perception of content in most applications.

⚠️ Attention: The actual diagonal in the rectangle may be smaller than the stated diagonal due to the rounded corners of the screen. When measuring with a ruler, you can get values of about 6.3-6.4 inches, which is a normal error in modern times. OLED and IPS round-panel.

And it's also worth mentioning the aspect ratio, which in this case is 19.5:9, which is an elongated format that has become the industry standard, which allows you to hold a smartphone with one hand, while maintaining a higher height of useful space for web surfing and social networks, and the width of the device remains comfortable for typing with two thumbs.

IPS LCD Technology and Color Transfer

Unlike the older models, the lineup that received AMOLED-matrix, in Redmi Note 9 installed panel type IPS LCD. This solution has its advantages, the main of which is the absence of the risk of burning out pixels during prolonged display of static interface elements, IPS-screens are often perceived by users as more natural in the transmission of colors, especially white and gray shades.

The brightness of the screen reaches 450 nits in manual mode and can increase to 500 nits when automatically adjusted in bright light conditions. Although this is not a record for the market in 2026-2026, for everyday use indoors and outdoors with an average sun, there is enough brightness reserve, contrast is 1500:1, which is typical for quality IPS matrixes.

The color gamut covers the NTSC standard of 84%, which provides saturated, but not excessively acidic colors. Xiaomi engineers have adjusted the color rendering to make the images look attractive to most users without requiring deep calibration. For those who prefer colder or warmer tones, the system has Standard, Saturated and Paper modes.

• 🎨 Type of matrix: IPS LCD DotDisplay technology.
• 💡 Maximum brightness: up to 500 nits (typical).
• 🌈 Color gamut: 84% NTSC read-enabled.
• 🛡️ The Corning Gorilla Glass 5.

An important aspect is the presence of protective glass Corning Gorilla Glass 5. It provides protection from scratches and damage when falling from a height of up to 1.6 meters on a rough surface. However, this does not make the screen invulnerable, and the use of protective film or glass is still recommended to preserve the presentation of the device for a long time.

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To reduce eye strain in the evening, activate the "Paper" mode in the display settings. It adds a light yellowish hue that mimics the texture of the printed edition, and reduces the emission of the blue spectrum.

Update frequency and sensor layer

One of the things that is often overlooked is the refresh rate of the image. In the Redmi Note 9, it's a standard 60Hz. That means that the picture on the screen is updated 60 times per second. For most tasks like watching videos, reading news and working with documents, this is more than enough for a smooth and comfortable experience.

However, in games and fast-scrolling social media feeds, the difference between 60Hz and today’s 90 or 120Hz can be noticeable. MIUI animations (now HyperOS) look smooth thanks to optimization, but the physical limit of the matrix remains unchanged. For users accustomed to high-frequency screens, moving to this model can seem like a step backwards in terms of visual smoothness.

The touch layer supports multi-touch up to 10 simultaneous touches, which is enough for any game or navigation gestures. The sensitivity of the screen can be adjusted in a special engineering menu or through settings to improve responsiveness when using protective glasses. The developer menu also provides options for calibrating the speed of double pressing.

⚠️ Attention: When using thick protective glasses or films, the sensitivity of the sensor may decrease, in which case you need to turn on the “High Sensitivity” mode in the screen settings to avoid problems with touch recognition.

Sunlight Display automatically improves brightness and contrast when direct sunlight hits the surface of a smartphone. This improves the readability of text in the open air. The algorithm works quickly enough to respond to changes in lighting within a fraction of a second, which is especially important when using a navigator in a car or while walking.

Comparison with the Pro and 9S modifications

The Redmi Note 9 lineup comes in a few modifications, and the differences in screens between them are a key factor in choosing: The base version of the Redmi Note 9 has a diagonal of 6.53 inches, while the Redmi Note 9 Pro and 9S version features a 6.67 inch screen. The difference of 0.14 inches may seem negligible, but visually the Pro-series device looks larger and more massive.

Moreover, the older models of the series use IPS LCD technology with higher peak brightness and improved color reproduction. In some regions, the base model could be equipped with matrixes from different suppliers, which sometimes led to differences in color temperature ("cold" or "warm" screen) even within the same model, whereas in the Pro versions quality control was stricter.

The resolution in the Pro versions is also higher — 2400x1080 vs. 2340x1080 in the base. The pixel density is 395 PPI in both cases, but due to the larger diagonal in the Pro version, the image seems a little more detailed due to the lack of strong interpolation when zooming the interface.

When choosing between these models, consider that the larger screen in the Pro version requires a larger body and accommodates a more capacious battery, which increases the weight of the device. The basic version feels more compact and lightweight in the hand, which for many users is a decisive argument in favor of a smaller size.

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The base version of the Redmi Note 9 is 0.14 inches smaller than the Pro model, making it more convenient to use with one hand, despite having a slightly smaller area of usable space.

Display settings and calibration

The MIUI shell on the smartphone provides a wide range of tools to customize the display. The user can change the color scheme by choosing between Standard, Saturated and Paper modes. In Saturated mode, the colors become more vivid, which is what you like when viewing photos, but can distort real shades when editing.

Adaptive Brightness learns the user’s habits by remembering the preferred level of backlight in different lighting conditions. Over time, the smartphone begins to adjust the brightness itself when you pick it up in a dark room or go out in the bright sun. To reset these settings, you can use the “Reset Adaptive Brightness” button in the screen menu.

Special attention should be paid to Safe Mode or Read Mode, which turns the screen into black and white, which is useful for focusing on text or reducing eye strain when reading e-books, and you can activate it through the notification curtain or by assigning a hot key to it.

• 🔆 Brightness: manual and automatic adjustment with a light sensor.
• 🎨 Color scheme: the choice of temperature and saturation of colors.
• 📖 Reading Mode: Imitating E-Paper for Eye Comfort.
• ⏱️ Time Out: Setting Time Before Screen Shutdown.

In the engineering menu, available through code ##6484##, you can do a deeper calibration, there are broken pixel tests, gradient checks and color balance calibration, but without proper knowledge, changing the parameters in the engineering menu is not recommended, as this can lead to incorrect display of colors throughout the system.

Typical problems and their solution

Despite the reliability of the matrix, users may face certain problems, and one of the common complaints is the “jelly effect” of fast scrolling, which is a feature of the vertical arrangement of pixels in IPS matrices of this type.

There is also sometimes uneven lighting around the edges of the screen, visible only on a black background at low brightness, a phenomenon known as "backlight bleed." In most cases, it does not interfere with everyday use, but sensitive users may notice a glow in the corners. In extreme cases, the device can be handed over as a guarantee if the defect is critical.

Touchscreen problems, such as phantom presses, can occur when using low-quality chargers. Electromagnetic interference from cheap power supplies keeps the capacitive layer running. The solution is simple: replace the charger with an original or certified one.

⚠️ Note: If vertical or horizontal bands appear on the screen, this indicates physical damage to the plume or the matrix itself.

To diagnose problems with the display, you can use the built-in Mi Test app or service code ##6484##. After passing the Display test, you can check the sensor response, the presence of dead zones and color channels, which will help determine whether the problem is software or hardware.

Frequently Asked Questions (FAQ)