Image courtesy of www.hanoverdisplays.com and http://en.wikipedia.org/, originally uploaded by Jimbo (Alan James Wellock).
The traditional Rollsign display is seen as the father of the Split-flap and Flip-dot display systems. Using the simple motor movement of rotation, a long sheet of material is rolled and attached to a top and bottom roller. The mechanism then simply turns, by either a manual or motorised mechanism, changing the graphic shown in the window or screen.
Used on early buses and tube trains this kind of display has a nostalgic, metropolis feel. This is due to the fact that to change what the screen displays you have to physically change the graphic meaning its 'bandwidth' for communicating varied information is very low. It still though has a physical animation, not I don't think has a effective or as striking as the previous two displays but still high on 'associative bandwidth,' and adding to the interactive experience.
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