In 2010 Universal Display announced a new AMOLED display architecture called RGB1B2 that uses two blue sub-pixels - a fluorescent deep-blue and a phosphorescent light blue. The introduction of a light blue sub-pixel can significantly extend the operational lifetime of an OLED display and reduce the display's power consumption by as much as 33%.
The RGB1B2 was never adopted (one of the reasons is that adding another sub pixel complicates the TFT backplane and has other disadvantages - but the architecture is now again on the table and UDC presented it again at OLED Korea 2019.
It turns out that in addition to the significant power savings, the RGB1B2 also mimizies the blue light emission of the OLED display. Excessive exposure to blue light has been linked to many health issues - including cancer, diabetes, heart disease, obesity and insomnia. There has been a lot of discussion on eye-safely and eye-comfort lately, with OLEDs seen as better displays than LCDs in this regard. UDC's architecture could enable, perhaps, even safer displays for our mobile devices.