Nano LED can promote the development of fingerprint scanning and tactile skin technology

What are the similarities between the electronic signature, fingerprint scanning, and robot touch the skin? Thanks to a new system that can convert a Zinc Oxide nanowire array into a miniature LED, these three technologies will soon be pushed forward. Each line will respond to externally imposed mechanical pressure in a shiny way, and the computer will be able to produce a high resolution image of the surface pressure by analyzing the tiny "spot mosaic". Since 2009, piezoelectric LED Technology ("piezo-phototronic LED") has been developing.

The team is from the Georgia Institute of Technology (Georgia Institute of Technology) Wang Zhonglin (transliteration) led by professor.

Nanowires from a layer of gallium nitride (gallium nitride) film, while the light is produced from its contact with the bottom substrate.

When these "lines" have any stress changes (such as a pen or a fingerprint pressure), will have a greater stress, charge - charge more, the brightness will be higher. The electroluminescence signal will be processed, and then it will be possible to determine the two gradients of shape and pressure.

According to the introduction, this kind of piezoelectric LED array can be within a few milliseconds to induction pressure, then will recover within a few milliseconds. At present, the resolution of the technology is as high as 6300 points per inch, but researchers believe that can be made by the smaller line to enhance the accuracy.

A paper of the study, published in nature photonics "published yesterday" (Nature Photonics).