The three TV vendors will jointly create software development kits, which will be distributed to third-party developers to write TV applications, LG said in a statement.
It is the first such collaboration in the smart TV sector, LG said, adding the three would complete software development kits by the end of this year.
They will use different operating systems for their smart TVs, but the applications will become interchangeable once they adopt a common technology standard for building applications, LG said.
It said the tie-up would have a substantial impact on TV makers, app developers and users.
LG has seen flagging sales of mobile phones and televisions this year because it failed quickly to roll out smartphones to rival Apple's market-leading iPhone and Samsung Electronics' Galaxy S.