According to Bloomberg, Apple opened a new laboratory in Taiwan where 50 engineers are developing new display technologies. Apple aims to develop new iPhone and iPad screens that are thinner, lighter, brighter and more energy efficient. Bloomberg says that Apple is focused on better LCDs - but is also "keen" to move to OLED displays.
In the last few months, we've seen many reports that Apple decided to switch to OLED displays in the future for their iPhone and iPad devices - with aims to adopt OLED displays starting in 2017 or perhaps 2018. The major barrier for Apple is the large production capacity required for their devices.