The smartphone market today is saturated with devices that look almost identical, but the display remains the main window to the digital world. When it comes to Xiaomi’s limitless screen, many users imagine a perfect black panel, devoid of any cutouts, holes or bezels. This is not just a marketing ploy, but the result of years of work by the company’s engineers to integrate the front camera and sensors directly into the matrix.
Unlike traditional banging or islet solutions, Xiaomi Under Display Camera (UDC) technology hides all components under a layer of pixels. When turned off, the screen is a monolithic surface, which greatly enhances the aesthetic appeal of the gadget and improves ergonomics when viewing content. However, this beauty hides complex technical trade-offs that are worth knowing about before buying.
As you understand what a limitless screen is, it's important to understand the difference between mechanical retractable cameras like the Mi Mix 2S or Mi Mix 3 and modern optical technology. Mechanics wear out and take up a lot of interior space, while new UDC technology has no moving parts and allows for more waterproof devices, which is why the focus has shifted to purely hardware-based camera hiding solutions.
The principle of operation of UDC technology
The technology is to change the structure of the pixel grid above the camera lens. In normal screens, each pickle consists of subpixels of red, green and blue, which are located tightly together. In the area above the camera, Xiaomi engineers use a special layout where the subpixels are spaced further apart, forming a kind of “grid”.
Through these microscopic gaps, light enters the camera matrix, and a complex color redistribution algorithm is used to prevent the human eye from noticing the difference in pixel density. When light passes through the holes in the screen, it scatters and loses clarity, so a powerful force comes into play. ISP-processor and artificial intelligence algorithms that programmatically restore the image, removing the effect of fog and lights.
The technology has evolved over generations, and while the camera was pretty mediocre in the early versions, in recent implementations, such as the Xiaomi MIX 4 series or the MIX Alpha concepts, quality has settled into conventional front-facing modules. But physics is physics: the amount of light passing through the screen will always be less than through an open hole, which is especially noticeable in low-light conditions.
- 📸 Pixel microstructure: Reducing the pixel density in the camera area for light transmission without visible loss of image quality.
- 🧠 AI-Algorithms: Neural networks in real time correct color reproduction and contrast, eliminating defects caused by the passage of light through the display.
- 💡 Self-luminous elements: Use of organic LEDs that can be located less frequently in certain areas without loss of brightness.
Why does the camera shoot worse under the screen?
Importantly, the UDC implementation requires not only the screen but also the entire motherboard architecture to be redesigned, sockets and plumes must be positioned so as not to overlap the camera area, and the cooling system must not cause thermal interference to the sensor.
The evolution of frameless solutions Xiaomi
The journey to the perfect screen has been long and thorny, with Xiaomi starting experiments in 2016 with the first Mi Mix, when engineers removed the top bezel, moving the front camera to the lower right corner, and replaced the speaker with a piezoelectric vibration membrane that transmits sound through the body.
The next step was mechanics, and the retractable models allowed for a 100% honest screen without any compromise in photo quality, but they were heavy, thick and vulnerable to dust, and the fall of the smartphone could have fatally affected the mechanism, forcing the industry to look for alternatives.
The current stage is the Under Display Camera, which has brought back the standard dimensions of the case and improved water protection. In recent models such as the Xiaomi 13 Ultra (although it uses a periscope, screen technologies are tested in parallel) and concepts, the thickness of the frames was reduced to an absolute minimum of 1-2 millimeters on all sides.
The evolution of materials also affected the use of ceramic enclosures in the Mi Mix series, which made the frames thinner because the ceramics were stronger than aluminum and didn't require wide buffer zones to protect against impacts, and it also affected the perception of "infinity," creating a trickle-down effect.
| Model/Technology | Year out | Type of front camera | Screen area |
|---|---|---|---|
| Xiaomi Mi Mix | 2016 | Lower corner | ~84% |
| Xiaomi Mi Mix 3 | 2018 | Slider (mechanics) | ~91% |
| Xiaomi Mi Mix Alpha | 2019 | Concept (screen wrapper) | ~105% (around) |
| Xiaomi MIX 4 | 2021 | UDC (under the screen) | ~91.5% |
Today, we see technologies that have been tested in expensive concepts gradually being introduced into the mass segment, but we have to be realistic: a full-fledged, limitless screen with a high-quality camera underneath it is still the lot of flagship devices.
Advantages and Disadvantages of a Hidden Camera
Like any innovation, UDC has its pros and cons. The main advantage, of course, is immersion. When you watch movies, play games or read books, there's nothing distracting you from the content, and it makes you feel like you're holding the device of the future.
In addition, the lack of a cutout increases the strength of the top of the screen. In conventional smartphones, the area around the bangs or holes is the stress point where cracks most often appear when falling. Solid glass distributes the load more evenly, which theoretically increases impact resistance.
⚠️ Note: Although there is no visible hole, the area above the camera can be visually distinguishable with a bright white background or maximum brightness level.Some users notice a light grid or difference in color reproduction.
On the other hand, there are disadvantages: Selfie cameras are still inferior to traditional modules, especially at night; noise cancellation algorithms are more aggressive, which can lead to loss of detail; and some applications that require accurate facial recognition (such as banking) may be slower or require additional confirmation.
💡
For video calls at night, try to use additional lighting, which compensates for the loss of light through the layers of the display and improves the picture quality in Zoom or Skype.
Another nuance is heating. Because the camera is under a screen, which is a great thermal insulator, it's difficult to remove heat from the sensor. With long-term 4K video, a smartphone can heat up faster than a conventional frontal model.
Impact on user experience
For the average user, switching to a limitless screen is primarily a matter of aesthetics and convenience. Not having to reach for the top corner to swipe a notification or complete a call makes handling more comfortable, especially on large diagonals.
MIUI and the new HyperOS are optimized to work with these displays. System fonts and icons are scaled to avoid overlapping important elements, even if the camera is technically underneath them. In the gaming industry, support for such screens is also growing, with many games now able to hide the interface in the camera area or adapt it.
But there's also the flip side of the coin, which is addiction. UDC-And when you go back to the device with the big bang, it can be uncomfortable, and the brain quickly gets used to the purity of the image, and it starts to perceive any cutouts as a defect.
- 🎮 Gaming: Fingers do not overlap the review in shooters and MOBA-games, as the capture zone is on the sides.
- 🎬 Multimedia: Complete absence of black stripes when watching movies in the format of 21:9.
- 🖐 Ergonomics: uniform weight distribution and lack of protruding elements from above.
Also worth mentioning is the protection of vision, which is often associated with more advanced lighting technologies (such as DC Dimming) that reduce flickering, making using your smartphone at night safer for the eyes.
Comparison with competitors
Xiaomi isn’t alone in the race for the perfect screen, Samsung (Galaxy Z Fold series), ZTE (Axon series) and Oppo have all presented their solutions, but the approaches are different. Samsung, for example, has long used a pixel layout that gave a better picture but worse photo quality, and only in the latest models did things improve.
ZTE On the contrary, it was a bet on early mass production. UDC-Xiaomi is in this context occupying a niche of technological balance, trying to innovate first in concepts (Mix Alpha), and then polish them in flagships (Mix 4).
⚠️ Warning: Don't confuse a limitless screen with curved edges (Waterfall).Curved edges are just a design technique that doesn't remove the camera and often creates problems with random taps, whereas the curved edges are just a design technique that doesn't remove the camera and often creates problems with random taps, while UDC — It's a real technology.
An important difference is software optimization. While competitors can use standard drivers, Xiaomi is actively developing its own image processing algorithms, which allows you to squeeze the maximum from the existing hardware.
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The main difference Xiaomi in the approach to the limitless screen is the combination of experimental materials of the case (ceramics, liquid metal) with advanced methods of hiding the camera.
Prospects for technology
The future of limitless screens looks promising, and by 2026-2026, the difference in quality between a conventional camera and an underscreen camera is expected to be indistinguishable to the human eye, and the development of materials science will allow for transparent conductors that do not block light.
Work is also underway to increase the transparency zone, which is now only hidden in a small circle or oval, but in the future, the entire screen could become potentially transparent to sensors, opening up new possibilities for fingerprint scanners throughout the area and health sensors.
And don't forget foldable devices. UDC technology fits perfectly with the concept of foldable smartphones, allowing you to use external screens without cutouts, which greatly expands the functionality of gadgets in the folded state.
☑️ What to look for when buying a smartphone UDC
So Xiaomi's limitless screen is not just a beautiful picture in a promotional booklet, but a complex technological process that continues to evolve. Should you buy one now? If you care about design and are willing to put up with a little selfie compromise for the sake of wow effect, definitely yes.