Apple is not going to buy PAN because it doesn't make any sense. What does make sense is Apple buying oled panels from LG display (which is ramping a small screen flexible line this spring), or AUO. There would not be a contract between PANL and Apple, because apple does not manufacture screens - contract would be between PANL and an oled manufacturer - but it really doesn't matter since all PANL cares about is materials sales and doesn't care which end product the materials end up in - if Apple adopts OLED screens it would be a significant boost to PANL material sales.
A potentiallly sort of negative outcome is if Samsung's ramps its capacity enough to start selling to Apple instead of just producing for itself...some of the upside would be capped by the terms of the contract - royalties would not scale with materials sales like they would if Apple bought from LGD or AUO. But this is only a relative negative - Apple adoptin would be huge for the stock and for the financial statements.