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2. Flip-disc display - Wikipedia

   en.wikipedia.org/wiki/Flip-disc_display

   Flip-disc display elements (close up). The disc rotates on the shaft that is carried in the two triangular posts. The magnet that powers the rotation can be seen embedded in the disc. Under the disc is the driving solenoid; when powered, a field is induced into the two posts, flipping the discs. Rotation stops when the disc hits the post.

3. Magna Doodle - Wikipedia

   en.wikipedia.org/wiki/Magna_Doodle

   A Magna Doodle drawing board. Magna Doodle is a magnetic drawing toy, consisting of a drawing board, a magnetic stylus, and a few magnet shapes.Invented in 1974 by Pilot Corporation, [1] over forty million units have been sold to date worldwide, under several brands, product names and variations, including Tyco and Mattel/Fisher Price.

4. Split-flap display - Wikipedia

   en.wikipedia.org/wiki/Split-flap_display

   The Signaltron main departure board at Praha-Smíchov station, Czech Republic (2012), manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a split-flap clock

5. Display board - Wikipedia

   en.wikipedia.org/wiki/Display_board

   A display board, also known as poster board, is a board-shaped material that is rigid and strong enough to stand on its own, and generally used paper or other materials affixed to it. Along with quad charts , display boards were an early form of fast communication developed by the National Weather Service of the United States Department of ...

6. LED display - Wikipedia

   en.wikipedia.org/wiki/LED_display

   Detail view of an LED display with a matrix of red, green and blue diodes The 1,500-foot (460 m) long LED display on the Fremont Street Experience in Downtown Las Vegas, Nevada, is currently the largest in the world. A LED display is a flat panel display that uses an array of light-emitting diodes (LEDs) as pixels for a video display.

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   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.