Gorilla Glass is a special type of glass usually used to protect many devices’ displays. Currently, it is also widely used to protect smartphone displays.
Oppo A77 4G Gorilla Glass
The Oppo A77 4G has an IPS LCD. But the phone doesn’t offer any display protection or Corning gorilla glass protection to protect it. It can always protect the phone display. There is needed to use a separate protector glass to protect the display on the phone.