You should bookmark the sixteen nine blog if you are interested in digital signs. The blog recently highlighted a PQ media study which identifies digital out of home as the world’s 2nd fastest growing medium.
Digital out of home is projected to grow by 14%/year for 2013-2017.
Out of home is projected to grow by 4%/year for the same time period.
14% and 4% growth is encouraging when compared to the 2-3% growth rate for the US economy.