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A screensaver is a type of computer program initially designed to prevent "Phosphor burn-in" on CRT and plasma computer monitors by blanking the screen or filling it with moving images or patterns when the computer is not in use. Today, screensavers are also used for entertainment or security.

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Wikipedia About Free Screen Savers

A screensaver is a type of computer program initially designed to prevent "Phosphor burn-in" on CRT and plasma computer monitors by blanking the screen or filling it with moving images or patterns when the computer is not in use. Today, screensavers are also used for entertainment or security.

Purpose

Before the advent of LCD screens, most computer screens depended on cathode ray tubes (CRTs). When the same image is displayed on a CRT screen for long periods of time, the properties of the exposed areas of phosphor coating on the inside of the screen gradually and permanently change, eventually leading to a darkened shadow or "ghost" image on the screen. Televisions, oscilloscopes and other devices that use CRTs are all susceptible to phosphor burn-in, as are plasma displays to some extent.

Screensaver programs were designed to help avoid these effects by automatically changing the images on the screen during periods of user inactivity.

For CRTs used in public, such as ATMs and railway ticketing machines, the risk of burn-in is especially high because a stand-by display is shown whenever the machine is not in use. Older machines designed without burn-in problems taken into consideration often display evidence of screen damage, with images or text such as "Please insert your card" (in the case of ATMs) visible even when the display changes while the machine is in use. Blanking the screen is out of the question as the machine would appear to be out of service. In these applications, burn-in is prevented by shifting the position of the display contents every few seconds, or by having a number of different images that are changed regularly.

Modern CRTs are much less susceptible to burn-in than older models due to improvements in phosphor coatings, and because modern computer images are generally lower contrast than the stark green- or white-on-black text and graphics of earlier machines. LCD computer monitors, including the display panels used in laptop computers, are not susceptible to burn-in because the image is not directly produced by phosphors (although they can suffer from a less extreme and usually non-permanent form of image persistence). For these reasons, screensavers today are primarily decorative or for entertainment, and usually feature moving images or patterns and sometimes sound effects.

One increasingly popular application is for screensavers to activate a useful background task, such as a virus scan or a distributed computing application (such as the SETI@home project). This is convenient because these applications only use resources when the computer would be otherwise idle.

Considerations

Monitors running screensavers consume the same amount of power as when running normally, which can be anywhere from a few watts for small LCD monitors to several hundred for large plasma displays. Most modern computers can be set to switch the monitor into a lower power mode, blanking the screen altogether. A power saving mode for monitors is usually part of the power management options supported in most modern operating systems, though it must also be supported by the computer hardware and monitor itself.

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Preclick® Releases Free Trial of its Popular PhotoMovieMaker™ Software

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John P. Falcone

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Vote better food, softer mattresses

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Answers for Free Screen Savers

Cory TWhere can i find some awesome free screen savers and wallpaper?Cory Tyou can go to the http://www.brothersoft.com/screen_savers/ there are many free screen savers,such as 3D ScreenSavers, Animals ScreenSavers and so on, if you want to get the wallpaper,go to http://ww...acircle@ymail.comWhere do you find good FREE screen savers?acircle@ymail.comGo to www.yahoo.com Then go to the page where that have the options to pick from- Pick"Greeting." In there you will see wallpapers and Screensavers. There are free and not nasty and easy to ins...mr. mwhere are free screen savers or 3d animated? none in search programs ! do they exist ?mr. mIf you don't get a ton of pop-up windows offering free screensavers, You're very lucky! watch out for them though, they are usually spy ware. If you go to windows updates, you can download screen save...dragon_wolf45free screen savers for vista?dragon_wolf45microsoft.com/screensaversobama suckshalf life 2 free screen savers sites?obama suckshttp://halflife2.filefront.com/files/Half-Life_2/Media/Screensavers;2969 that should be it...
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