What do you have in common between electronic signatures, fingerprint scanning, and robotic tactile skin?
Thanks to a new system that converts zinc oxide nanowire arrays into tiny LEDs , these three technologies will soon be advanced. Each "line" responds to externally applied mechanical pressure in a shiny manner. By analyzing tiny "spot mosaics", the computer can produce a high-resolution image of surface pressure. Since 2009, piezoelectric LED technology has been developing.
The team is led by Professor Wang from the Georgia Institute of Technology.
The nanowires come from a layer of gallium nitride film, and the light is produced from its contact with the bottom substrate.
When these "lines" encounter any change in stress, a charge is generated - the greater the stress, the more the charge, and the higher the brightness. The electroluminescence signal is processed and the shape and pressure gradients are determined.
According to reports, this piezoelectric LED array can sense the pressure within a few milliseconds and then recover within a few milliseconds. The technology currently has a resolution of up to 6,300 dots per inch, but researchers believe that precision can be improved by making smaller "lines".
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