Sony has filed a patent infringement complaint claiming LG's mobile phones sold in the United States had used its technologies without permission.
LG, the world's third-largest mobile phone maker, said it would take action after reviewing the technologies.
Spokeswoman Na Joo-Young said: "Based on results of our review, we will take action and actively respond" to Sony's move.
Sony has filed a complaint with the US International Trade Commission, which can ban imports of products found to violate US patents, and also with a federal court in Los Angeles, which has the power to impose fines.
Sony's mobile phone joint venture, Sony Ericsson Mobile Communications, is the world's sixth-largest mobile phone maker.
Sony is also the world's third-largest TV maker.
LG's mobile phone business has been under heavy pressure due to its slow response to the fast-growing popularity of smartphones.
Chief executive Nam Yong resigned in September after the mobile phone business stumbled.
LG's third-quarter net profit plunged 99% year-on-year to 7.57 billion won (US$6.6 million).
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