While many will incorrectly tell you it doesn't happen,
LCD is still susceptible to image burn in, or what they now call image retention. If you are watching all
HD material, the risk is minimal. If on the other hand, you watch a lot of 4:3 TV without stretching or zooming to fill your screen, or watch primarily letterboxed movies, then the area displaying the black bars will be burned into the set.
DLP is the only widely available technology that doesn't result in damage if a black or other non moving image is continuously displayed.
However, if you are mostly watching
HD material, or stretching the image to fill the screen, then it doesn't matter too much.
