By The Associated Press
THE TREND: Playing video games on just one screen is no longer enough.
GAME DEVELOPMENT: The top three publishers - Microsoft, Nintendo and Sony - each focused on new ways to spread games and other content across several screens at the gaming industry's annual trade show in Los Angeles.
SLIGHT DIFFERENCES: Microsoft is tapping into existing phones and tablets; Sony is depending on its PlayStation Vita handheld device; and Nintendo is coupling an iPad-like controller with its new Wii U console.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.