The lowly digital photo frame is emerging as a connected "third screen" at home, and the product's evolution has chip suppliers, consumer electronics companies and even wireless carriers seeing dollar signs.

Connected digital photo frames drew crowds at the International Consumer Electronics Show in January, and the Mobile World Congress in Barcelona last week saw a host of cellular carriers in hot pursuit of the platform. New models from leading digital photo frame OEMs are slated to debut in March at the PMA (Photo Marketing Association) International Convention.

Stephen Tomlin, CEO of Chumby Industries, has called the digital photo frame "a new class of personal consumer device that [is] neither PC nor mobile phone."

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