| 摘要 |
A modular display device using triangular cross section columns side-by-side on a flat, concave, convex surface, in a vertical, horizontal orientation, which provid es three different images. Each said column successively is rotated 120dgr and locked in that position via a continuous length loop roller chain and sprockets so that each face is cyclically brought into display position. For multiple sides viewing, said display can be set back-t o- back, interlocked, in a triangle, rectangle arrangement where a single gearbox motor running no n- stop to realign and pause all said columns in any of the said arrangements. Outdoor, indoor use with safety features to prevent public hazard and incorporating special effects on displayed image.
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