LOS ANGELES (AP) — If the gaming industry agreed on one idea at this week's Electronic Entertainment Expo, it's that playing video games on just one screen is no longer enough. 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 downtown Los Angeles. While the publishers' systems rely on the same premise, namely using more screens to access more content, each is achieving multi-screen functionality through different means: 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.