But...but...Samsung only builds cheap plastic crap?
Samsung does make decent components, but I would only use them as a secondary supplier and always have others to mfg components. Unfortunately, the Apple designed processors/chips are being mfg by Samsung until they can get TSMC and possibly others to turn on their factories. I think in a matter of two years or so, Apple may be almost 100% not reliant on Samsung.
Blah I forgot to mention this in my last post, but IPS was actually invented by Hitachi, so possibly in Japan. They made much better panels and coatings overall, even if that isn't the extent of the engineering needed to make a working display. If you're looking at display panels on their own, the problem was cost, not quality. Low costs won over higher quality. I don't have a study for you as I don't know that a formal study exists, but if you did a comparison of displays from the same generation, it was a pretty significant difference.
Apple just release the retina mini!