Why is there a black screen when the screen display function is turned on?

Solution:

When the screen is turned on, it will enter a black screen in the following situations:

1. When the watch detects that the wrist is off, the screen will be automatically blacked out for more than 5 minutes, reducing the power consumption caused by the screen being always on.

2. After 15 minutes of sleep detection, the watch will automatically black out.