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Electronic displays a sign of the times. Campuses use digital signage to deliver information on emergencies and more. By Meris Stansbury, Assistant Editor, eSchool News . Aug 7th, 2008. Print this article …. Another company, Immersive Display UK, has released a new range of 3-D digital hemispherical and spherical advertising signs . The signs have a 180- or 360-degree viewing capability and already are...