Scientists at the University of California have developed a new display technology that uses a liquid filled with highly charged plastic-coated iron oxide particles, which by repelling one another form an ordered structure called colloidal photonic crystal. This substance can then be controlled with a magnet placed behind it.
The microscopic spacing between the particles allows them to reflect light. Each particle is a pixel that represents a unique color.
The scientists have managed to create a range of colors, and suppose this new technology could replace the LCD technology and make large displays much cheaper.