Yes, screen savers are fun to look at for a few seconds, but those animations actually used to serve a purpose beyond simple entertainment.

In older CRT and plasma monitors, and even newer OLED ones, leaving a static image on the screen for an extended period of time could create a burn-in, i.e., a burned in image that you’ll vaguely see for a limited time (as in image persistence) or permanently.

This issue is rare on LCD monitors and laptop screens, so it’s not a huge issue today for your Mac. All of Apple’s computer screens have been using LCD technology since they abandoned CRT in 2006… more

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