Case causing screen burn in

Been using the s-view case since original launch of the N20 ultra and haven't noticed this issue.
The issue is that the S-View Flip Cover case allows a constant display on a side window -- so if that part of the display is always on, it can cause burn-in of that side display. It's not that the case itself is causing the burn-in -- it's how the S-View display stays on.
 
Been using the s-view case since original launch of the N20 ultra and haven't noticed this issue.

Do you ever notice that window area to be a little darker than the rest of the screen? I'm still curious about the potential for differential sun exposure to cause that.