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A whiteboard of the future

May 5, 2015 | Telepresence Options

black-side-of-the-microparticles

The black side of the microparticles contains magnetic nanoparticles that make it possible to write on the screen. A magnet pulled across the surface of the white display attracts the black side and the balls flip to face the magnet. (credit: Yusuke Komazaki/University of Tokyo)

Story and images by KurzweilAI

Researchers from the University of Tokyo have developed an inexpensive handwriting-enabled e-paper suited to large displays like whiteboards.

The display is made from black-and-white microparticles about 0.1 millimeter in diameter. One hemisphere of each particle is black and carries a negative charge, while the other is white and carries a positive charge. The particles are sandwiched between two electrodes. By switching the direction of the voltage across the electrodes the background display can be switched between black and white.

Handwriting-with-a-magnet

Handwriting with a magnet is demonstrated on a prototype of the new e-paper (credit: Yusuke Komazaki/University of Tokyo)

Such "twisting ball" displays are not new, but the researchers have integrated a magnetic field control component with the original electric control. The black side of the microparticles also contains magnetic nanoparticles that make it possible to write on the screen.

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