Hi hpst, I'm new here and I found the one with the same suffering as I have so quickly! As you can't, I also can't use any new device like laptop, smartphone, camera too. Currently, I postponed a new car purchase because of unbearable displays they are putting inside.
I'm absolutely sure that the devil is in the LED backlit. However, I have several LED-backlit devices I can watch without any problems - like my old laptop HP from 2012, or Samsung Duos 2 (I think from 2013). Then they must have changed something with used LED what we unfortunate cannot bear, I think.
Except displays I have another proof of my theory: I had underwater LED diving light. When it got faulty, I bought the "same" new one, but it had "improved" light source which makes me eyestrain after several seconds of using...
I wonder if there is anyone who knows anything about LED technology changes in several last years?