A screen saver, which serves as a desktop enhancement like a wallpaper, is a great way to personalize your computer. It can also be an animated image activated on a computer display when no user activity has been perceived for a while. Its purpose is to prevent burn-in—the burning of image into the phosphor inside the cathode ray tube (CRT) after hours of the same image being rescanned. With the efficiency of today’s technology, however, CRT burn-in is quite unlikely in our modern computers. Windows and Mac come in with built-in screen savers, or at least lets you set up one from a choice of many. Whenever you leave your computer unattended for a couple of minutes, the screensaver is activated on the screen or computer display. On your iphone, it would be helpful to have a screen saver enabled, though, many prefer simply a black screen to save on battery life.
http://www.telcoworld.com.au/news-blog/info-article/melbourne-iphone-screen-repair-cracked-screen-screen-saver-burn-in/
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