Screen dims after camera records video for a while

Problem phenomenon: 

After using the camera to record video for a period of time, the screen will become dark, and the screen cannot be restored by clicking on the screen.

Solution: 

Based on the power-saving design, the system automatically reduces the screen brightness after recording a video for a period of time. Reducing the screen brightness does not affect the video recording picture quality. After exiting the video recording, the screen brightness automatically returns to normal.