splitflap

A split-flap display, also known as a flap-display or Solari board, is an electromechanical display technology that shows information, such as time, station names, or scores, using a series of rotating mechanical flaps. Each flap is typically a single character or symbol. When a change is needed, specific flaps rotate to reveal the desired character. The mechanism is often driven by a central motor that engages a series of gears and clutches to move individual flaps. The characteristic clicking and whirring sounds are a hallmark of these displays.

These displays were widely used in public places, particularly train stations and airports, throughout the 20th century for their legibility and durability. They were favored for their ability to be seen clearly in various lighting conditions and from a distance. Early examples date back to the mid-20th century, with significant advancements made by companies like Solari di Udine in Italy. The mechanical nature of the display meant that updates were not instantaneous, and the process of changing information involved a visually engaging, albeit slow, sequence of flap movements.

While largely replaced by modern LED and LCD screens due to their speed, silent operation, and ability to display more complex graphics, split-flap displays maintain a certain nostalgic appeal. Some historical transportation hubs have retained their original split-flap displays for their aesthetic and historical value, and there is a niche market for modern replicas and smaller-scale versions used as decorative items or for hobbyist projects. The unique visual and auditory experience of a split-flap display is a distinctive feature that sets it apart from contemporary digital signage.