Vivo's X20 is a high-end Android smartphone that features a 6" 1080x2160 Super AMOLED display, 12 MP dual-lens camera, Snapdragon 660 Chipset (2.2Ghz octa-core), 4GB of RAM and 64GB of storage. The X20 Plus is a similar phone with a larger (6.43") display and a larger battery.

Vivo X20 photo

The X20 and X20 Plus phones will ship by the end of September 2017 for $454 (X20) and $530 (X20 Plus).

OLED type: 

6-inch (6.43") 1080x2160 Super AMOLED

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters