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.
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