1. Reason 1: Monitor reason. Different monitors have different refresh rates. Just like computer freezes, the monitor may also freeze, leaving afterimages.

2. Hardware problem. The author’s graphics card and monitor interface are different. The graphics card has a high-definition HDMI interface, but unfortunately the monitor has a normal-definition VGA interface. This is caused by opening large-scale 3D games and other programs that cause the monitor's refresh rate to fail to keep up.

3. Solution: We right-click on the desktop, change the desktop theme in Personalization, and let the monitor refresh, so that the afterimage can be removed.