Scientists create 'floating pixels' using soundwaves and force fields

October 13, 2016, University of Sussex
Scientists create ‘floating pixels’ using soundwaves and force fields
The pixels are levitated using a series of miniature ultrasound speakers that create high-pitched and high-intensity soundwaves that are inaudible but forceful enough to hold the spheres in place. They can be spun and flipped using electric force fields. Credit: University of Sussex

A mid-air display of 'floating pixels' has been created by scientists. 

Researchers at the Universities of Sussex and Bristol have used soundwaves to lift many tiny objects at once before spinning and flipping them using electric force fields. 

The technology – called JOLED - effectively turns tiny, multi-coloured spheres into real-life pixels, which can form into floating displays or bring computer game characters to life as physical objects. 

To be presented next week at a future technologies conference in Japan, the research opens up new possibilities for mobile and game designers, giving them a new way of representing digital information in a physical space. 

Professor Sriram Subramanian, in the University of Sussex's School of Engineering and Informatics, is the head of lab behind the research. He says: "We've created displays in mid-air that are free-floating, where each pixel in the display can be rotated on the spot to show different colours and images. 

"This opens up a whole new design space, where computer and mobile displays extend into the 3D space above the screen." 

The pixels are levitated using a series of miniature ultrasound speakers that create high-pitched and high-intensity soundwaves that are inaudible but forceful enough to hold the spheres in place. 

A thin coating of titanium dioxide gives the pixels an electrostatic charge, enabling them to be manipulated in mid-air by changes to an electric force field, created by tiny electrodes. 

Credit: University of Sussex

Dr Deepak Sahoo, Research Associate in Human-Computer Interaction at the University of Sussex, said: "The most exciting part of our project is that we can now demonstrate that it is possible to have a fully functioning display which is made of a large collection of small objects that are levitating in mid-air. 

"JOLED could be like having a floating e-ink display that can also change its shape." 

The paper is the first to demonstrate such a fine level of control over these levitating pixels, moving the technology closer to something that might soon be part of theme parks or galleries. 

For example, in the future such a display could be placed in a public park to show to users the complex and changing patterns of carbon footprints of different countries or currency fluctuations in different regions of the world. This could allow the general public to clearly see the multi-dimensional data and interact with it. 

Asier Marzo, research associate in the Department of Mechanical Engineering at the University of Bristol, explained: "Traditionally, we think of pixels as tiny colour-changing squares that are embedded into our screens. JOLED breaks that preconception by showing physical pixels that float in mid-air. 

"In the future we would like to see complex three-dimensional shapes made of touchable that levitate in front of you." 

Professor Subramanian added: "In the future we plan to explore ways in which we can make the display multi-coloured and with high colour depth, so we can show more vivid colours.   

"We also want to examine ways in which such a display could be used to deliver media on-demand. A screen appears in front of the user to show the media and then the objects forming the display fall to the ground when the video finishes playing."

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5 / 5 (1) Oct 13, 2016
Nicely done. I'm sure the resolution can be upped quite a bit for some neat advertising displays.

I was playing around with ultrasound and floating pixels in 1997 or thereabouts using Lycopodium powder as the 'pixels' and then illuminating them with a laser pointer. The goal was to get a 3D display going. The idea fell apart because I couldn't get the grid stable (and I also noticed that the more layers you have the more tricky it gets to align the laser. Also you start to get occlusion problems. (Additionally you get to clean up the powder from all over your appartment. The stuff is so fine that it gets everywhere. Not to mention somwewhat expensive to work with in quantities)
not rated yet Oct 13, 2016
Not to mention somwewhat expensive to work with in quantities

Not to mention explosive when dusted finely in air.

One of the practical uses for lycopodium powder is simulating grain silo explosions in small scale.

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