During the International Display Workshops that was help a few weeks ago in Fukuoka Japan, LG Display discussed its new WOLED tandem stack that it plans to introduce soon to its OLED TVs and lighting panels.
LG Display says that its new stack is a "3-stack-OLED" while its existing stack is a "2-stack-OLED". As you can see in the image above, LG apparently counts each emissive layer as a different stack in this case.
For the OLED lighting, the new stack coupled with silver cathodes a new light-extraction film with high reflectivity will enable LG to achieve 90 lm/W. LG's new panels will achieve a CRI of 88 and a color temperature of 2,850K. According to OLEDNet, LG said that these new panels will be the ones LG will produce in its upcoming 5-Gen OLED lighting fab.
For its OLED Tvs, the new stack structure enabled LG to increase its color gamut from 114% sRGB to 129% sRGB (or from 90% DCI to 99% DCI). The power consumption was improved by 20% and LG will be able to ship OLED TVs that feature 1,000 nits of brightness in 2017.
This seem to counter previous reports that suggested that LG is set to replace its yellow+blue stack to a red+green+blue stack.