The Vivo NEX Dual is a large smartphone that features a 6.39" 1080x2340 Super AMOLED display, a secondary 5.49" 1080x1920 Super AMOLED display on the back, an under-the-display fingerprint sensor, a Qualcomm Snapdragon 845 Octa-Core chipset, 10 GB of RAM, 128 GB of storage and Dual-SIM.

Vivo NEX Dual photo
The Vivo NEX Dual is now shipping. You can find it on eBay for around $899.

OLED type: 

6.39" 1080x2340 and 5.49" 1080x1920 Super AMOLED displays

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters