GridNetworks said Monday it has formed a collaborative relationship with Comcast Corp. and received an undisclosed investment from Comcast Interactive Capital.

GridNetworks is a Seattle company that has developed technology, called GridCasting, that allows media companies to make full-screen, high-definition video available over the Internet.

Comcast (NASDAQ:CMCSA,CMCSK) is a Philadelphia-based cable-television, Internet, phone and media company based in Philadelphia. Comcast Interactive Capital is its venture-capital arm.