Why does the Xiaomi 15T Pro screen brightness fluctuate when playing HDR videos?

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Accepted Answer

Thank you for your support of Xiaomi. HDR videos feature a high dynamic range, with significant variations in brightness and contrast within the same scene. To reproduce these effects accurately, the Xiaomi 15T Pro adjusts both screen brightness and grayscale during playback. As a result, entering or exiting HDR content causes slight brightness fluctuations. This is normal for HDR playback and does not affect video quality, clarity, or color reproduction.
These automatic adjustments preserve bright highlights and maintain detail in dark areas, ensuring accurate HDR presentation. The brightness fluctuation can also be influenced by ambient lighting and adaptive brightness settings, which help maintain consistent visibility in different environments.
This behavior is inherent to HDR content processing. It reflects the phone's ability to display accurate dynamic contrast, vivid visuals, and smooth gradation across scenes, providing a comfortable and realistic viewing experience.