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Today, screen savers are also used for entertainment or security purposes.before advent lcd screens, most of the computer screen relies on cathode ray tube (provided). If the same image is displayed on the screen crt information on the registration of long-term exposure to the region is gradually phosphor inner coating of the screen and permanent change, and ultimately lead to dark shadows, or "ghost" image on the screen.

…Television, oscilloscope and other devices that will be both easy to use phosphor - burning and plasma display Some program designed for extent.screensaver avoid these effects by changing the image, which helps users to automatically screen display inactivity. For used in the same period, 00 ATMs and the railway ticketing machines, and the risk - This feature is particularly high because of the video display stand - by computer is not in use both versions will be displayed.

Older machines designed to burn - often without consideration of this issue, to show evidence of damage to the screen, or text and image "and to insert the same card" (ATMs cases), even if the visible changes in the display during machines. Screen blanking the question, he displayed a lack of mechanical services are insufficient. These applications, and the recording - is changing the location to prevent the display of information, every few seconds, or by different kinds of images has changed regularly.