ViewSonic's ELITE XG550 is a 55" gaming monitor based on LG's 4K 120Hz WRGB OLED panel.

Viewsonice Elite XG550 photo

ViewSonic says the XG550 will ship in Q4 2020.

OLED type: 

55" 4K WRGB AMOLED

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Atomic Force Microscopy for next-gen OLED processesAtomic Force Microscopy for next-gen OLED processes