![]() This is because the phosphor compounds which emit light to produce images lose their luminance with use. With phosphor-based electronic displays (for example CRT-type computer monitors, oscilloscope screens or plasma displays), non-uniform use of specific areas, such as prolonged display of non-moving images (text or graphics), repetitive contents in gaming graphics, or certain broadcasts with tickers and flags, can create a permanent ghost-like image of these objects or otherwise degrade image quality. One way to combat screen burn-in was the use of screensavers, which would move an image around to ensure that no one area of the screen remained illuminated for too long. ![]() Newer liquid-crystal displays (LCDs) may suffer from a phenomenon called image persistence instead, which is not permanent. ![]() It is caused by cumulative non-uniform use of the screen. Screen burn-in, image burn-in, ghost image, or shadow image, is a permanent discoloration of areas on an electronic display such as a cathode ray tube (CRT) in an old computer monitor or television set. Burn-in on a monitor, when severe, is visible even when the monitor is switched off.
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