| 摘要 |
The system has display sectors (10) distributed on a same plane and including display portions. The display sectors are distributed along radial directions around a geometric center. Each sector is movable in rotation around its longitudinal axis. A driving device is arranged in a manner to pivot the sectors for making the display portions to be visible at time intervals of the display portions. The driving device acts on the sectors such that a number of the visible portions changes from 0 to N during a period and changes from N to 0 in another period, where N is 12. |
