The Wikipedia article on LCD Persistence (http://en.wikipedia.org/wiki/Image_persistence) actually has a good explanation, FWIW. Perhaps the reason I haven't seen this on any of our monitors yet is because I have them all set to power down in 2-3 hours. I do not use screensavers.
>The cause of this tendency is unclear. It might be due to accumulation of >ionic impurities inside the LCD,[1] electric charge building up near the >electrodes,[2] parasitic capacitance,[3] or "a DC voltage component that >occurs unavoidably in some display pixels owing to anisotropy in the >dielectric constant of the liquid crystal".[4] Usually the image persistence is temporary, but can become permanent. As a result, all major LCD display manufacturers exclude image persistence from their warranties. ************************************************************************* ** List info, subscription management, list rules, archives, privacy ** ** policy, calmness, a member map, and more at http://www.cguys.org/ ** *************************************************************************
