Supernova1138 :
One telltale sign would be viewing angles. Do the colorurs or overall quality of the display degrade if any major changes are made to your viewing angle. TN panels have poor viewing angles, while IPS panels don't have display quality dips until very extreme viewing angles. Aside from that, look up your exact laptop model and see what kind of display it has.
I clearly stated the reason why i do not want to look up my laptop model, because things can be changed..., And the other stuff you said is basic google results, of course i checked that before posting on a forum, I am not nearly sure, i have only had one monitor in my life and that was an old one...