After foldable and dual-screen phone-tablets, Oppo has now unveiled a concept smartphone with a rollable display that broadens and narrows the screen to give two form factors in one device.
Oppo took the wraps off the Oppo X 2021 prototype on a stage demo at its Inno Day 2020. The phone features a slider on the edge for the user to control an electronically rollable screen that behaves and functions similarly to paper on a scroll, only with an OLED display.
"In this new concept it's very hard for us to define the accurate size of this screen. In theory it is variable," says Oppo.
Oppo says the maximum size is 7.4 inches and the minimum size is 6.7 inches (188mm and 170mm) while the width of the screen varies between 2.8 inches and 4.2 inches (70mm and 107mm). Oppo says when the screen is expanded, the display achieves a "seamless effect".
The display is expanded by a "roll motor powertrain" inside the body of the phone that's driven by electric motors.
To achieve the scroll effect for expansion and contraction, a portion of the OLED panel is laminated onto a track – for sturdiness – and the panel moves around the roll motor on the left, which has a 6.8mm scroll diameter. That diameter was apparently important as it was the key to the display not creasing like Samsung's foldables. The display then is concealed in a compartment.