A:Answer Burn in on OLED units takes a lot of effort, to be honest. It typically happens when the same static image displays on the TV for an extended period of time - say 4 hours a day for weeks, if not months. The most common example is watching a news channel every day and having the channel's logo burn in. For example - if you're watching Channel 4 News and the little Channel 4 logo displays in the lower right or left hand corner.
Again it takes some serious effort to make this burn in. If you're using the TV mainly to stream movies or TV shows, without any logos or overlays constantly on the screen, you'll be just fine. Also, once the TV has been used for ~1,000 hours or so, the window for burn in even being a potential to happen all but disappears.
Hope this helps! There's a decent amount of literature about the subject on Google if you're interested in learning more about it.
