Lately, we have been hearing a lot about OLED panels for future iPhones and from what we have heard, Apple will make the switch to OLED from IPS somewhere around 2018. While that date may seem far away, preparations have probably started as we are talking about the iPhone here!
The truth is that as far as OLED panels are concerned, there aren't a lot of manufacturers that can produce these displays on massive scales. It was thought before that although Samsung is the biggest name in OLED production, Apple might approach JDI or Japan Display Inc. for the supply. The rumors were based on the fact that Apple and Samsung are not exactly on "friendly" terms anymore.
A new set of rumors however, point out that the Korean giant is going to invest anywhere between $6.64 billion to $7.47 billion very soon into their panel production wing. Furthermore, the rumors also state that in 2016 itself, a sum of $2.49 billion to $3.32 billion is going into Samsung's OLED production process. Supposedly, this would bump up the production rate to 30,000 - 40,000 sheets on a monthly basis. An additional $4.17 billion will be invested next year for ensuring 45,000 units are manufactured monthly.
As far as rumors go, these massive numbers are the results of a contract between Samsung and Apple that has already been signed. This is what we have heard so far, but as always, take the "leaks" and "findings" with a pinch of salt as nothing has yet been officially declared.