Why Do Plasma Displays Experience Burn-In?
Not only plasmas are susceptible to burn-in effect. Just about any phosphor-based screen, whether plasma, tube rear-projection (but not the modern LCD, LCoS or DLP based rear-projection screens), and even CRT TVs may be affected. Burn-in occurs because of uneven wear of phosphors in your display. The least lighted parts of your screen will emit more light than those parts that were displaying a bright image, thus leaving a visible after-image.
