Xiaomi 18 Fold Display Test: Stunning HDR Brightness, Excellent Colors, but One Important Caveat
The Xiaomi 18 Fold shows just how far foldable smartphones have come, especially in one of the most important areas for daily use: display quality. Foldable phones were once seen as impressive but compromised devices, often falling behind traditional flagship phones in brightness, durability, or visual performance. With the Xiaomi 18 Fold, that gap is becoming much smaller.
In display testing, the Xiaomi 18 Fold delivers outstanding peak brightness levels. The inner foldable OLED panel reaches an impressive 3,759 cd/m² in HDR conditions, while the outer display comes extremely close at 3,735 cd/m². These figures place both screens among the brightest displays currently found on a foldable smartphone, making the device especially well-suited for HDR videos, high-contrast photos, and outdoor viewing.
This level of brightness gives the Xiaomi 18 Fold a major advantage when watching supported HDR content. Highlights appear intense, bright scenes look vivid, and the overall image has strong visual impact. Whether you are streaming movies, viewing photos, or using the phone under direct sunlight, the display clearly has plenty of brightness potential.
However, there is an important detail to keep in mind. These extremely high brightness numbers are achieved under specific HDR conditions and do not represent the maximum brightness users can access manually at all times. When brightness is adjusted manually, the inner screen reaches up to 621 cd/m², while the outer display reaches 639 cd/m². These are still solid values for everyday use, but they are far below the headline-grabbing HDR peak brightness figures.
Color reproduction is another strength of the Xiaomi 18 Fold. In the Pro Warm color profile, the foldable display fully covers the sRGB color space and produces impressively accurate colors. Color deviations remain low, while the color temperature and gamma curve stay close to ideal targets. This makes the screen suitable not only for entertainment but also for users who care about natural-looking images, photo viewing, and more accurate color presentation.
The 120 Hz refresh rate further improves the experience. Scrolling feels smooth, animations look fluid, and supported games benefit from more responsive visuals. Combined with the strong brightness performance and accurate color tuning, the Xiaomi 18 Fold offers a premium display experience that feels worthy of a modern flagship foldable phone.
Still, the display is not without a possible drawback. Measurements show noticeable brightness modulation at low brightness levels, with a main frequency of around 120 Hz. A secondary frequency of 1,315 Hz was also detected. This matters because some users are sensitive to PWM, or Pulse-Width Modulation, which is a technique often used to control brightness on OLED panels.
For many people, this flicker may not be noticeable during normal use. However, users who are sensitive to PWM may experience eye strain, headaches, or discomfort, particularly when using the phone at lower brightness settings in darker environments. The presence of a higher secondary frequency does not automatically solve the issue, because the overall flicker pattern and the strength of the low-frequency modulation also play a major role in comfort.
Overall, the Xiaomi 18 Fold delivers one of the most impressive display packages in the foldable smartphone category. Its HDR brightness is exceptional, the outer and inner screens are closely matched, color accuracy is strong, and the 120 Hz OLED panel provides a smooth and premium viewing experience.
At the same time, the PWM behavior at low brightness could be a concern for sensitive users. For most buyers, the Xiaomi 18 Fold’s display will likely feel bright, vibrant, and highly refined. But for those who are prone to flicker-related discomfort, it may be worth testing the screen in person before making a decision.
