The message about Sharp was pretty much declaration of intent (the planning stage) .
The message about Japan Display clearly stated that they are using Japan produced materials.
Overall, Japanese Patent office was not recognizing UDC patents and was fighting them until UDC acquired Fuji patents. I haven't heard anything about patent litigation in Japan since that time. Japanese electronic makers (Sony in particular) were ahead of Korean companies in OLED but then they dropped it. Now they are playing catch up and they probably feel that they own the technology.
I don't think they are going to use UDC chemicals now but things may change when they get to production level . I think the bigger question is licensing .