Blockbuster on Tuesday threw its hat into the increasingly crowded ring of set-top boxes with the announcement of a deal with hardware maker 2Wire. Blockbuster’s system will bring video directly to viewers’ televisions on demand via a broadband Internet connection. The move follows similar offerings from competitors. The Web-connected hardware comes months after chief rival Netflix came out with a set-top box manufactured by Roku. However, Blockbuster’s system draws video from the Web differently, and it charges using a different pay structure.