South Korean tech firm LG has unveiled a smartphone with a larger screen which swivels out to reveal a second, smaller one underneath.
The Wing’s second screen can either act independently of the larger screen while it is displaying a film, for example, or can complement it as a controller for gaming and media.
However, some of this functionality relies on using pre-installed browsers.
One expert said it was one of the “more radical designs” he had seen.
“You have to applaud LG for experimenting. Ultimately it will be up to consumers to decide whether its an approach that works.”
The 5G device also has three cameras on the back and a fourth pop-up lens.
North America and European launches would follow, it added, but the handset price has yet to be revealed.
The firm has taken some steps to reduce potential damage to the amount of moving hardware on the device.
The internal accelerometer, which monitors motion, detects if the smartphone is being dropped and the pop-up camera will retract if it is in use, LG says.
The hinge of the swivel screen is equipped with a hydraulic shock absorber, and the back of the main screen has a coating to prevent it scratching the smaller screen underneath.
LG claims the hinge is “still reliable” after 200,000 swivels, although it’s not clear how much time this would be likely to take.