Digital signs are frequently located in crowded public venues, so the screens and content need to stand out. Accordingly, these networks were early adopters of large-screen LCD’s, plasma monitors, front/rear projectors, organic LED (OLED), and holographic and 3D imaging technologies. For very simple applications, a digital sign might simply be a scrolling message board, but even those devices can display basic graphics and animation.

Most digital signs are mounted on a wall, ceiling, shelf, or endcap, but the creative use of display technologies has led to innovations like polarized projection film. This lets you project high-contrast images onto store windows or displays that appear to float in mid-air.