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JOLED uses ultrasonic waves to “float†solid pixels around an electric field.
We have already seen many interesting applications of ultrasound, such as letting the foam balls and droplets float. However, scientists at Sussex and Bristol University have gone one step further by creating a low-resolution "display" that allows circular "solid pixels" to float and even rotate one by one in the office. This technology is called JOLED, which uses a spherical expanded polystyrene "pixel" array, which is coated with titanium dioxide to obtain electrostatic forces.
A series of acoustic transducer arrays (essentially miniature speakers) are arranged above and below, which can create a reverse ultrasonic wave that humans cannot hear, but enough to put lightweight "pixels" into the air.
Through the sound wave density between the loudspeakers, it is possible to move all or a single floating ball. The "pixel" rotation is achieved by manipulating the electric field force that surrounds the screen. This is where the titanium dioxide coating is used.
After applying different colors to each side of the pixel, the "display" can be rotated to change the color, thus displaying a colorfully transformed pattern array.
Of course, before this technology is put into a theme park or art gallery, we hope to further improve its resolution.
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