Oppo is rumored to have registered patents for the three design smartphone fold at once. The first is the design like a folding clamshell or cell phone, but the whole screen is filled by its surface.
In the design of outstanding images, Oppo makes an airbag to avoid display panel or its screen is broken because it is folded. Information and pictures of this design distributed by the original site LetsGoDigital, Netherlands.
The purpose of these SACs is created as a space to store the air trapped inside the smartphone when bent to produce a flexible chassis design.
The second design is foldable Oppo smartphone using a hinge so it has a dual screen like ZTE Axon m. the difference is it does not separate the hinges of the screen such as ZTE Axon M making it like two smartphones that are put together.