Mia Technology offers a range of digital signage solutions depending on your needs, actually one of the best companies for diversity.
What sets Mia Technology is the power it has to adjust to the needs of the job, from a PC as a server using to MIA servers capable of displaying different images based on internet and ftp.
Basically offers two large classes of the first digital signage solutions non-PC which is based in MIA devices that are capable of playing different content using a single PC, making it highly scalable and less expensive talking money.
The other way is the traditional way where we need to connect a PC for each of the displays and show differents images, and if we use only one PC will have the same image throughout.
Technology has also Mia players covering a large capacity hardware formats and an incredible here I leave the link to their official site.