Flexible displays that can change color, convey information and even send veiled messages via infrared radiation are now possible,
thanks to new research from the University of Illinois Urbana-Champaign. Engineers inspired by the morphing skins of animals like chameleons and octopuses have developed capillary-controlled robotic flapping fins to create switchable optical and infrared light multipixel displays that are 1,000 times more energy efficient than light-emitting devices.
In the lab, the team created small boxes, or pixels, a few millimeters in size, that contain fins made of a flexible polymer that bend when the pixels are filled with fluid and drained using a system of tiny pumps. The pixels can have single or multiple fins and are arranged into arrays that form a display to convey information, Tawfick said.
A schematic of the display simultaneous optical and infrared signals of the words “OK” and “NO.” In the graphic, cold pixels are indicated by a blue color and hot pixels are indicated by a pink color. Graphic courtesy Sameh Tawfick. The team said that because the science behind gravity’s effect on droplets is well understood, it will provide the focal point for their next application of the emerging technology.
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