If you were wondering about the PLS tech in the Tab screens, take a look at this!

http://thetechjournal.com/tech-news/...pls-spls.xhtml

Apparently Samsung developed PLS to offer better brightness, better viewing angle than existing IPS at around 15% cost savings. A very interesting technology.

Apple was apparently interested in using PLS for their devices at one point. With production starting en mass in 2011, it's clear why they couldn't use the tech in their devices.