Yes, the POCO X7 supports Dolby Vision.
Dolby Vision is a high dynamic range (HDR) technology that adjusts brightness, contrast, and color for each scene or frame using dynamic metadata, resulting in more vivid and realistic visuals. Compared to standard HDR, Dolby Vision supports higher peak brightness (up to 4000 nits or more), a wider color gamut, and 12-bit color depth, delivering more vibrant colors, deeper blacks, and brighter highlights to enhance the viewing experience. To fully enjoy Dolby Vision, both the device and the content need to support this technology.