screen saver

noun Computers.
a program that displays a constantly shifting pattern on a screen when the computer is idle, originally used to prevent damage to the screen through continuous display of the same image but now used primarily for decoration.
Also, screensaver [skreen-sey-ver] .
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World English Dictionary
screensaver (ˈskriːnseɪvər)
 
n
a computer program that reduces screen damage resulting from an unchanging display when a computer is switched on but not in use by blanking the screen or generating moving patterns, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To download the screensaver, click the link below the image of the screensaver.
Thanks for the new screensaver and all the info that goes with it.
The screensaver kept kicking in to make the screen go dark, and it was too
  clumsy to share on the bed.
Baker suggested that users should have some way to tell the screensaver to try
  a different approach.
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