Yonhap News reports that the Korean cousins Samsung and LG are in a row over the eye-tracking technology in their respective flagship phones, the Galaxy S4 and Optimus G Pro. The feature at the center of the controversy is called Smart Pause by Samsung and Smart Video by LG, and lets users pause a playing video by looking away from the screen. LG says it applied for the relevant patent in 2009 (as well as other eye-tracking inventions as far back as 2005) and plans to check if Samsung's phone infringes when it launches next month. Samsung, of course, denies infringing LG’s patent, saying it has its own technology and used different methods for its own implementation. The two companies' phones are both scheduled for release in April.