In July 2017 Audi unveiled its flagship luxuries sedan, the 2018 Audi A8, which uses OLED taillights. Hopefully the A8 is Audi's first car with OLED panels in all versions (the 2016 TT RS also has OLED lighting, but these were optional).
Audi did not yet reveal the specification of these OLEDs, but now it has released the image above which shows the structure. The A8 uses four OLED modules on each side , each with what seems to be 6 different structured panels, a large red one and five yellow ones which form the turn indicators.
The 2016 Audi TT used OLED lighting panels produced by OSRAM and it is likely that OSRAM also produces the OLED panels used in the A8.