We are moving slowly but surely into a new era of mobile technology with Samsung, Motorola, and Huawei all tying to bring along flexible OLEDs into folding phones. It’ll probably have a few years for foldable phones being mainstream, but what about stretching phones? Oppo has revealed an idea phone having a “continuously variable OLED display” that changes size in your hand to maneuver between tablet and phone-like form factors.

The device, known as the Oppo X 2021, isn't a finished product — the organization hasn’t talked specs, durability, price, or perhaps a release date. It’s more like a technology demo than a phone you can expect to purchase. Currently, the Oppo X 2021 sports a 6.7-inch OLED display in “phone mode” that, having a quick swipe, can expand to 7.4 inches. That’s not really a huge size difference, but it’s noticeable. The phone conformation includes a typically tall form factor, however the tablet mode stretches it right into a more square aspect ratio. The OS may also flip between phone and tablet app layouts once the phone transforms.

If we’ve learned everything from recent foldable phones, the folding hardware is make or break — in Samsung’s case, it had been more “break” when it launched the original Galaxy Fold. It's since revamped its hinge design, and newer foldables haven’t shown exactly the same tendency t break. A stretching phone is really a different animal, though.

The screen on the Oppo X 2021 isn’t actually stretching, of course. It’s like a motorized scroll that feeds the flexible OLED into and out of a hidden compartment at the edges from the device. The middle of the panel is laminated onto a “warp track” that expands in both directions to improve stability. Because the two parts of track move apart, the extra OLED slides out of the body from the phone and boosts the viewable area. You can see the mechanism in action below — it appears downright science-fictional. Oppo says it has applied for 122 patents for that Oppo X 2021, and 12 of them are just for motorized scroll mechanism.

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Despite the phone’s “2021” name, Oppo has no immediate intends to launch this phone or anything enjoy it. This is still just a concept device, and we were seeing concept folding phones for a long time prior to the Z Fold debuted. Oppo says it'll bring the continuously variable OLED display to consumers “when the time is appropriate.”