Sure, UDC makes the magic powder (and lPs) that makes OLED possible. This is akin to wireless IP's created by Qualcomm, Ericsson, Nokia, Moto and others that drive market demand for Apple's mobile devices. It's a public company and their patents are widely licensed, though, in mobile displays, Samsung is the only one to gain from their pioneering work.
They hold many more patents than just the powder within OLED displays, They own many of the manufacturing processes, sub-pixel patents, methods for reducing burn-in ETC. I am not saying Samsung doesn't hold a vast library of patents, however many of them rely on UDC patents, and their improvements associated to them. Similar to many of Apple's LCD patents relying on the underlying technology they based it on.
You should also take a look at UDC's financials, and what Samsung pays them in licensing before you pass judgement on who gains what. Stock for UDC jumped when it was reviewed that Apple was going to produce a device using OLED. While Samsung benefits from Apple paying licenses to their patent portfolio, in some ways, UDC does even more.
At the end of the day, I agree with something you indirectly touched on. Taking a stroll into the Legal information on an iPhone (and any Smartphone for that matter) will reveal a plethora of patents device makers like Apple, Samsung HTC, LG and others license to make our smartphones possible.
It is rare that any of the features / inventions we enjoy in our devices, actually came directly from an idea from that given manufacturer.
By the Way. People crediting Pentile as being a Samsung Invention, need to listen to this wonderful inventor, about some technology Samsung Purchased when they purchased her intellectual property. Without her, we wouldn't have the amazing displays we enjoy in many of our devices.