Because of the phosphor technology in Plasma TVs, it is possible for traces of an image to be 'burned-in' to the display, meaning you might see little traces of it even while watching other images. This is a concern in commercial uses, where images are shown for long periods of time. Burn-in can generally be avoided by making sure the screen does not show the same image for a long time (sometimes as little as 20 minutes), either by turning the television off, or changing the channel.