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Longman Dictionary of Contemporary English
screen saver
noun
EXAMPLES FROM CORPUS
▪ Facilities like the screen saver that's built in are redundant with Windows 3.1, but with version 3.0, are useful.
▪ In addition to ads, the screen saver features the information crawl at the bottom of the screen.
▪ It's a screen saver, yes, but that's only where it starts.
▪ One path to self-indulgence lies in having just the right level of tastelessness for a screen saver on your computer.
Wiktionary
screen saver

n. (alternative spelling of screensaver English)

WordNet
screen saver

n. (computer science) a moving design that appears on a computer screen when there has been no input for a specified period of time; "screen savers prevent the damage that occurs when the same areas of light and dark are displayed too long"

Usage examples of "screen saver".

He nodded at the screen, scrolling over which was Phate's screen saver - the motto of the Knights of Access.

Weed stared at all the basketball trophies and posters, the bed unmade, throw rug rumpled, University of Richmond tee shirt on the floor, the computer on the desk with its Bad Dog screen saver.

The colored light from the screen saver pattern streamed onto the floor in rainbow patterns of cold fire.

As Cheryl watched, the display blanked and the screen saver kicked in.

The computer, when he tapped a key to make the screen saver disappear, had been subject to an attempted search, but Luis wouldn't have had the luxury of a password to crack into the right file.

On the desktop computer, she returned to Griswald's Web page and waited, the browser colors blending into a screen saver of neon tropical birds.

Three clicks and I made it all but impossible to change the screen saver without trashing the entire system.

He nods toward the ThinkPad, open and activated on the passenger seat, its screen saver cycling.

The screen saver disappears, and the Rand McNally road map of the United States is on the screen.

It was friendlier and it was displaying a screen saver he recognized, a slide show of dolphins.