Sharp announced that it has developed, in collaboration with NHK, a 30" rollable 4K OLED panel on an IGZO backplane. This is a direct emission OLED, which sharp says is the world's largest ever produced (LG's OLEDs all use color filters).
Sharp's OLED panel is deposited on a thin-film substrate, and has a thickness of 0.5 mm. The display uses NHK's signal processing and panel driving technologies to "improve the brightness uniformity and video clarity".
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Posted: Nov 10,2019 by Ron Mertens
I am not sure but I think that Samsung OLED TV in 2013 were direct emission RGB OLED (no color filters), and at the time was available in 55-inch...
Therefore, my understanding would be that they were the world largest direct emission OLED displays...
The Sharp 30-inch rollable direct emission OLED display may however be the world largest ROLLABLE display that use direct emission OLED...