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First full colour display screen from single material developed London, Aug 26 (ANI): Scientists at the University of Toronto, Canada claim to have developed the first full colour display screen from a single material, which they say, could revolutionize the market for flat and flexible displays. Commercial screens based on the technology could be available in as little as two years time, said Andr Arsenault, a researcher of the team. The pixels in the device are made from photonic crystals similar in structure to the natural gemstone opal. Each crystal is made from silica microspheres in a repeating 3D pattern, which blocks certain wavelengths of light, or colours, while reflecting others. Altering the colour of the pixel is simply a matter of changing the spacing between the microspheres, which is achieved by stretching the material, Arsenault said. He said the beauty of the device is that it can produce the whole spectrum of colours, even ultraviolet and infrared light, using only incident light. As a result, the expensive colour filters used in every other colour display on the market today, would become redundant, he said. "And because the displays use only reflected ambient light, no power is wasted on backlighting, as in today's mobile phones, for example. They can be viewed just as well in bright sunlight as in indoor light," Arsenault added. The scientists stretched the crystals by bonding them to an electroactive polymer that expands when a voltage is applied to it, causing a change in the crystal structure. "By gradually increasing the voltage, we can span the whole visible spectrum, and even the UV and IR ranges. Such full-colour tuning is unprecedented," said Arsenault, who has now co-founded a start-up company, 'Opalux' to commercialise the technology. He said the crystals could be used to make full-colour flexible electronic paper, small displays, and large roadside billboards. However, this would involve scaling up the process, a task that has proven challenging for other display technologies, Arsenault said. "This is certainly an important work. Although the principle of tuning the photonic property by changing the lattice spacing is widely known, this system represents the first practical photonic-crystal-based display that has fully electrically tuneable colours," said photonic physicist Yadong Ying of the University of California, Riverside, US. The research appears in the journal Nature Photonics, reports New Scientist. (ANI) # 1:04 PM

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