Jep, i'm 99,9% Sure that i have both IPS Panels - got a friend of mine with unfortunately 2x TN Panels and his panels show the typical whitening/whashout while both (mine and his) device stand side by side.
As you can see, my bottom (IPS) Display is even at an angle of 179° (impossible to photograph, but by using my eyes
) quiet stable.
What I want to find out is, if the Modelnumber (QEF/QEH) seem to have more IPS Panels.
What i got out of the Reddit Thread:
QEF are more often shipped with both TN, but if you got an IPS Version, its usual that both Panels are IPS (mine is an QEF Version)
QEH are more often shipped with a combination of IPS Top/TN Bottom Display Setting, but very rare to have both IPS
So even concearning this, both have its Pros/Cons :/