MessageToEagle.com - Technology develops all the time and almost everyday researchers come up with a new innovation.
Now, a team of researchers Yoichi Ochiai, Alexis Oyama and Keisuke Toyoshima from the University of Tokyo
have developed the thinnest known transparent display.
This innovative technology enables projection of images on soap bubble, but projecting an image onto soap
isn't as easy as it may sound.
"It is common knowledge that the surface of soap bubble is a micro membrane," lead researcher Yoichi Ochiai said.
So the researchers subjected the bubble's membrane to ultrasonic sound waves, played through speakers.
Sonic waves break up the surface tension, creating a texture to the bubble that becomes opaque, while reflecting
enough light to project a vivid image for viewers.
The display uses a special combination of liquids to create a more durable bubble, but the main ingredient is still soap.
"It allows light to pass through and displays the colour on its structure. We developed an ultra thin and
flexible BRDF [bidirectional reflectance distribution function] screen using the mixture of two colloidal liquids."
Achieving such a thin screen is possible due to the fact that the structure of the bubble can be changed using ultrasound.
Photo Credits: University of Tokyo
Ultrasonic vibrations are used to produce images on the screen and control its transparency and texture.
Also multiple bubbles can be used together to display a 3D image.
"Our membrane screen can be controlled using ultrasonic vibrations. Membrane can change its transparency and surface
states depending on the scales of ultrasonic waves," Ochiai explained.
"The combination of the ultrasonic waves and ultra thin membranes makes more realistic, distinctive, and vivid imageries
on screen.
This system contributes to open up a new path for display engineering with sharp imageries, transparency,
BRDF and flexibility."
To keep the bubble from popping, a colloidal mix made up of sugar, glycerin, soap, surfactant, water, and milk,
enables the surface tension to be strong yet malleable. You can pass your fingers through the bubble without
popping the mixture.
The bubble’s texture can be also altered depending on the frequency of the waves and the surface texture can be changed
to be rough or smooth at will. For example, an image of a ball projected onto the bubble makes change its external appearance
fro a rough to smooth ball.
Changing the frequency (the type of wave) emitted by the speakers will also alter the reflective property
of the screen, which is a characteristic that cannot be changed at will on modern day screens.
Also the transparency of the projected image can be changed
at will, by affecting the intensity of the reflection. In similar way, like when we change the transparency of an image
in Photoshop.
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