| 摘要 |
A modular display apparatus for displaying indicia at a front thereof has an inner frame (10) with horizontal support beams (12), the inner frame (10) supporting a plurality of grid modules (18), at least one grid module (18) being located above another. A plurality of pixels (20) rotationally mounted to the grid modules (18) each includes first and second display faces (60, 62) joined along respective adjacent edges (64). The pixels (20) have a center of gravity located on each pixel (20) so as to interact with an external force applied to the pixel (20) and provide a complete rotation, with a minimum of bounce, to display a desired display face (60, 62). A triggering mechanism having a plurality of solenoids (38) adapted for selective actuation to rotate selected ones of the pixels (20) for changing the pattern of the desired display indicia controlled by an electronic signal transmitted from an electronics system. The electronics system causes the solenoids (38) to fire in two steps, including a first step of applying full voltage to each solenoid (38) for a fixed period of time and a second step of applying a significantly lower "hold" voltage to the solenoid (38) for the remaining time the solenoid (38) is activated. A single cable drive system (25) drives the triggering mechanism in bidirectional motion. |
