Screen-saver programs were designed to help avoid these effects by automatically changing the images on the screen during periods of user inactivity.įor 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. ![]() Cathode ray televisions, oscilloscopes and other devices that use CRTs are all susceptible to phosphor burn-in, as are plasma displays to some extent. When the same image is displayed on a CRT screen for long periods, 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, called a screen burn-in. Some screensavers use the otherwise unused computer resources to do useful work, such as processing for distributed computing projects.Īs well as computers, modern television operating systems, media players and other digital entertainment systems may include optional screensavers.īefore the advent of LCD screens, most computer screens were based on cathode ray tubes (CRTs). Screensavers are often set up to offer a basic layer of security, by requiring a password to re-access the device. Though modern monitors are not susceptible to this issue, screensavers are still used for other purposes. The original purpose of screensavers was to prevent phosphor burn-in on CRT, plasma and OLED computer monitors (hence the name). ![]() World Community Grid screensaver that uses idle system resources to help analyze proteins.Ī screensaver (or screen saver) is a computer program that blanks the screen or fills it with moving images or patterns when the computer has been idle for a long time. File:Screensaver HUMAN PROTEOME FOLDING Phase2.png
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