Burn in is a product of the youth of the technology. Burn in is a result of the blue oled molecules degrading faster than red and green. As new blue molecules are developed to be more robust those effects will be less likely. Just try not to leave static images for long Periods of time. I have 4 oled devices at the moment non have burn in.
I bought a store demo device once that was left on with a message box and that had crazy burn in. I bought it in philly and the store that I was in sold like refurb and trade in devices. The store owner insisted he didn't see burn in, so in my attempt to get a discount I went and flipped the light switch in his store and had the other customers around come look at how bad the burn in was and that he was playing stupid. So I got the device for $75 cheaper. At work we had the same device that we had ripped apart to reverse engineer, so I just swapped the screen and had a brand new device
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From my Galaxy Note 2 via Tapatalk