In early 2018 ASUS announced the Asus ProArt PQ22UC- a 21.6" 4K (204 PPI) ultra-portable OLED monitor, and now the company finally started shipping the new device - starting in the UK where the price is set at for £4,529 (!) which would make the US price at around $5,000.
The OLED display in ASUS' monitor produced using an ink-jet printing process by JOLED - which would make this the world's first ink-jet printed OLED product. JOLED's production capacity is not large, the company is still using a pilot-scale line, but it's likely that Asus is not expecting to sell many units of this high-end OLED monitor with that price tag...