Ireland-based OLED IP company Solas OLED has filed a lawsuit in the US (Texas) against Apple for patent infringements. The lawsuit mentions three patents (USPTO# 6072450, 7446338 and 7573068) that relate to the OLED stack, structure and circuitry (for example one of the patents relates to the formation of a backplane on a polyimide substrate).
Apple is of course not the producer of the OLED displays - but Solas says that Apple is accused of "making, using, selling, offering for sale, or importing products that infringe the claims" of its patents. Apple's OLED suppliers are Samsung (for the iPhone and MacBook Pro Touch bar devices) and LG Display (for the Apple Watch display).
We have talked to Solas, who told us that they have "spent the better part of the last two years trying to negotiate a license deal with Apple and its suppliers" for this technology, but were left with no option but to resort to litigation. Solas has also filed suits against Samsung and LG Display.