SeeSaw Networks, an out-of-home digital media company, has raised $3.3 million in a second round of funding. The company has a network of advertisers who want to get their messages to consumers outside the home.

In what it calls “Life Pattern Marketing,” SeeSaw places brand messages on digital signs such as LCD displays and on billboards. The company says on its web site that it can reach 30 million ad impressions per week. First-round investor Sutter Hill Ventures participated. Other investors include Dickey Revocable Living Trust and the Zweben Family Revocable Trust.

We’ve written about rivals before, including RippleTV, Captivate, Clear Channel Outdoor and Reactrix Systems.