The Oppo A91 smartphone uses a 6.4-inch notch-type 1080x2400 AMOLED display with an under-the-display fingerprint sensor. Other features include an Octa Core Mediatek Helio P70 chipset, 8 GB of RAM, 128 GB of storage, a microSD slot and a quad camera setup.

Oppo A91 photo

The Oppo A91 will ship by the end of 2019 for around $290.

OLED type: 

6.4" 1080x2400 AMOLED

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