TL;DRSamsung Display is showcasing a “Mobile Slidable” concept at MWC that expands from 5.1 to 6.7 inches.The phone slides out at the top to increase the screen size, but rotating to landscape allows for a longer horizontal display.It’s still under development, and past rollable demos from Samsung haven’t yet been adopted by flagships.It’s easy to feel like phone manufacturers might have pushed foldable form factors about as far as most people are interested in exploring, but that doesn’t mean there isn’t more room for innovation when it comes to expanding the viewable area on your device. In the same way that old-fashioned flip phones evolved into a single large display on the likes of the Galaxy Z Flip series, Samsung looks set to make the same leap with slide-open handsets, giving us an early glimpse of its new concept for a slidable display. The slidable display is “under development,” according to the Samsung Display exhibition at MWC in Barcelona, so we don’t yet no how long it might take this concept screen to reach your pocket. Still, it’s a fascinating take on expandable displays, especially for users who may not be too keen on foldables in general. The phone’s rails slide up to expand the device from the top, and the extra display area appears to roll out as you slide. Rotate it into landscape view, and you’d get a longer horizontal display.