When casting HDR videos from the Xiaomi Pad 7 to another display, you can notice that the screen appears darker. This occurs due to the unique display characteristics of HDR videos. When using screen mirroring or other casting methods, the device must process video encoding and rendering, and differences in video composition scheduling between devices can cause variations in HDR display effects. This is a normal state transition and does not affect the actual playback quality or viewing experience of HDR videos. For the best HDR viewing experience, it is recommended to play HDR content directly on the Xiaomi Pad 7. Please feel free to continue using your device and enjoy high-quality HDR visuals.