a computerprogram that makes a moving imageappear on the screen when the image on it has not changed for a period of time, especially so that the screen does not become damaged 屏幕保护程序
Examples from the Corpus
screen saver• One path to self-indulgence lies in having just the right level of tastelessness for a screen saver on your computer.• It's a screen saver, yes, but that's only where it starts.• In addition to ads, the screen saverfeatures the information crawl at the bottom of the screen.• Facilities like the screen saver that's built in are redundant with Windows 3.1, but with version 3.0, are useful.