I also didn't find any papers regarding to differences, but I have my eyes and experience.
I feel uncomfortable reading from a high quality OLED (iPhone X) or IPS panel (Apple MacBook Pro displays and an HP EliteDisplay) after reading for an hour or so, but when I open my Kobo Glo HD, I can read for hours without eye strain or feeling uncomfortable, even with front light. It just feels natural and doesn't make my eyes dry, forehead stiff or feeling exhausted. This is a study I'm conducting myself for 5+ years. So, it's enough of a data for me.
I feel uncomfortable reading from a high quality OLED (iPhone X) or IPS panel (Apple MacBook Pro displays and an HP EliteDisplay) after reading for an hour or so, but when I open my Kobo Glo HD, I can read for hours without eye strain or feeling uncomfortable, even with front light. It just feels natural and doesn't make my eyes dry, forehead stiff or feeling exhausted. This is a study I'm conducting myself for 5+ years. So, it's enough of a data for me.