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screen savers don't reduce energy use

4/4/2013

 
A computer set to “screen saver” mode uses nearly as much energy as when it is being used, so switch off your screen when you leave your desk.  It is a myth that screen savers reduce energy use.

Screen savers were developed to mitigate a problem called “screen burn-in” that can occur in both cathode ray tube (CRT) and liquid crystal display (LCD) computer monitors and TV screens. Burn-in occurs when a given image, such as a logo or a menu bar for a computer program, appears on a monitor for a long period of time. The mechanics are different for CRT and LCD displays, but the result is essentially the same over time, these long-duration images can get “burned” into the screen so that the viewer sees a “ghost” of these images even when they’re not supposed to be there. By using a screen saver, you prevent any specific images from being displayed in the same location when your computer is dormant for a long period of time, thus preventing burn-in. But it takes just as much energy to display a screen saver on your screen as it does to display any other program. To save energy, adjust your computer’s power management settings to automatically shut the monitor down after a specified period of idle time, and simply turn off the monitor if you are not going to be using it for 15 minutes or more.

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