Someone please help...

My mind has officially been blown, because on my Nexus 7 and iPhone the Facebook app has a dark blue color for the bar at the top. On my One X and my friend's Sony whatever it's a light blue color. I understand this is because of screen types and color reproduction but I thought the One X, iPhone, etc were all LCD's... and Super LCD2 was the same as IPS LCD. Also could you please explain how exactly that different color is created?