Universal Display (UDC) were speaking in the SID 2011 investor forum. They have recently raised $250 million, and when asked about their plans for this cash, the speaker said that they will be looking at IP acquisition - especially at doing more material layers.
This has been speculated before, but it's very interesting to hear it directly from UDC. Two possible targets for acquisition are Novaled (which indeed develops and sells non-emissive layer OLED materials) and Plextronics. It is also possible that UDC will purchase patents or technology and not an entire company (as they did in March 2011, buying 74 patents from Motorola).