ZTE's Nubia Z20 is a high-end smartphone that features two displays: a 6.42" 1080x2340 AMOLED on the front and a smaller 5.1" 1080x2340 AMOLED on the back for selfie images. The Z20 also features an Snapdragon 855+ chipset, 6/8GB of RAM, 128/512 GB of storage and a triple camera setup.

ZTE Nubia Z20 photo

The Nubia Z20 is now shipping, starting at around $500.

OLED type: 

6.42" 1080x2340 AMOLED and a 5.1" 1080x2340 AMOLED

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters