Samsung is developing a rollable-screen phone with a display that can extend and retract vertically between 16:9 and 21:9 aspect ratios, allowing users to switch screen formats freely based on usage scenarios and strike a balance between a wide screen and a slim body. The biggest challenge for this device lies in the sliding and retractable structure, which takes up a large amount of internal space and leaves limited room for the battery; both battery capacity and endurance after unfolding remain to be addressed. Samsung Display is driving the market rollout of rollable screens and plans to launch its first commercial rollable phone in 2028 with the Galaxy S28 series. Rollable phones are still at an early stage, with high technical barriers, and the market is more likely to be led by manufacturers with deep technical expertise. Samsung Display has previously showcased rollable-screen technology products such as Flex Hybrid, which combines folding and sliding capabilities, and Rollable Flex, which can enlarge the display by more than 5 times.