LCD screens aren't exactly subject to "burn-in" like CRT or plasma (the result of uneven phosphor wear), so much as they are "image retention", which is when the crystals become polarized after displaying the same image for so long and can't "relax" back to their normal state, resulting in a ghost image. But unlike phosphor burn-in, image retention is almost always reversible over time simply by changing the image (displaying a black screen for prolonged periods is typically recommended).

Thanks, Great explanation! I haven't seen the screen in attract mode but hopefully there is enough movement across the hole screen to avoid retention. I guess time will tell. Didn't know that a black image could improve this. I will have to try it sometime.