The International Sign Association has published a four-part series of articles about digital signage. All are free to ISA members and $24.95 each for non-members. The four articles are:
Selecting & Developing Exterior Digital Signage
Exterior Digital Signage Legibility and Content
Architectural Integration: Making Digital Signs Part of a Place
Digital Sign Codes and Design Best Practices
For more information, go to www.signs.org.