Especially in the first years, the outstanding concern of OLED is to increase the risk of burning or holding images, on the screen with traditional backlights. Partly due to the use of organic compounds, OLED panels can easily decrease at different levels over time, which is likely to lead to a change in brightness and color.
Thankfully, OLED Burn-in is less and less popular in modern TV for many reasons, including features such as screen saving, static images and other hardware methods to reduce and fix The ability to hold images. Although the Burn-in is still a light concern, it is only worth considering for extremely high users like gamers holding static images on the screen for hours (or day) at the same time. Even after that it is usually not forever. For most, OLED Burn-in is not worrying.
For more information about TV technology, from quantum dots to HDR and 4K, please see our instructions on How to choose the right TV (also linked above) or access the useful definition part of ”in Best TV guide For more information.