Researchers at the University of Toronto have created a full spectrum, even including infrared and ultraviolet, display using photonic crystals reports NewScientist.  Instead of the usual method of passing light through filters to isolate colors, this display works by reflecting ambient light of a specific wavelength.  It is constructed of tiny silica microspheres arranged in a 3D pattern on top of an electroactive polymer.  As current passes through the polymer it stretches causing the spheres on it to move apart.  As the distance between the spheres changes so does the specific wavelength of light that they reflect.  André Arsenault, one of the team members, has founded the company Opalux to further develop this technology.  He believes displays made in this manner can reach the commercial market in as little as two years.

The team who developed this technology believe it could be used to make flexible, electronic paper in addition to fixed displays ranging from small devices to large roadside billboards.