Oled displays are becoming increasingly popular. Here are some points to keep in mind: There may be some evidence when displaying.
If the content you watch contains static elements and you keep your oled tv running at maximum.
In 2019 models if you have a red magenta yellow orange still image ( for example a bar as you mentioned ) it will take somewhere near 400 hours at maximum brightness for the pixels to. With the right measures, you can extend the life of your oled screen.