Yea man, I was using one of Digole’s smaller OLED screens to just show Temp and Humidity readings. The screen was always on and it didn’t take but 30-60 days for the screen to burn that image into it.
You can even see this on the latest Samsung phones on display at Verizon and other stores where the phone is on most of the day. The demo screen burns right in and show up on everything else you look at on the phone. Not sure why this is the case but it is I’m surprised they still use them.