Hard on the heels of LG's announcement earlier this week that it is planning flexible-display handsets of its own, Samsung Electronics on Wednesday announced the release of the Galaxy Round, which it says is the world's first smartphone featuring a curved screen. Both Samsung and LG also offer curved OLED, or organic light-emitting diode, technology in large-panel TVs, but now the South Korean companies are aiming to put the curve in users' hands.