A couple of days ago it was reported that Sharp's President, Tai Jeng-wu, said that Sharp wants to collaborate with Japan Display to co-develop OLED displays. Both Sharp and Japan Display are struggling to launch OLED production, hoping to become Apple's second AMOLED supplier.
Following Tai Jeng-wu's statement, a source from Japan Display told the Nikkei Asian Review that Sharp did not yet approach JDI on this issue, and there are no discussions yet (I assumed otherwise...). The Nikkei Asian Review speculates the Sharp may be worried that any technology shared with JDI may leak to Taiwan's Foxconn.
Tai Jeng-wu issued a second statement saying that he believes that all display makers in Japan should join-forces, with government support, in order to be able to compete with Korean companies on OLED displays.