No need to display the stereoscopic 3D display on a liquid screen with a laser in Japan

Researchers at Utsunomiya University in Japan have recently developed a stereoscopic 3D display that uses a laser to generate bubbles in a liquid screen. The viewer can see the 3D image from all angles without using any 3D glasses or head-mounted display.

The researchers described in the "Optica" journal that stereoscopic bubble displays can produce variable color graphics.

The first author, Kota Kumagai, said: “To create a full-color, updatable stereoscopic display is very challenging, because many different color voxels must be formed, or voxels can produce three-dimensional graphics. In our monitor, microbubble voxels It is three-dimensionally formed in the liquid by focused femtosecond laser pulses. The color of this foam pattern can be colored by changing the color of the illumination light."

This technology is still in the prototype stage, but possible applications include tourist attractions. It can also be used in military and healthcare areas to help doctors visualize the patient's body before surgery or to understand the terrain and buildings before soldiers perform tasks.

Kumagai said: "The three-dimensional bubble display is most suitable for public facilities such as museums or aquariums because the system is currently huge and expensive. However, we hope to improve the size and cost of laser sources and optical devices in the future and create a new one. Perhaps a smaller system that is suitable for personal use in terms of price."

The team used lasers to shoot light pulses (one quarter second) of femtosecond light into a very precise location in the viscous liquid. When the liquid absorbs multiple photons at the points where these pulses focus, small bubbles form. Because the liquid is quite thick, those bubbles stay in place instead of floating to the top. All these bubbles form a 3D pixel (referred to as a voxel) of a complete holographic image.

To make it easier for the viewer to see the image, the liquid must be exposed to an external light source, such as an LED. The bubbles then capture and scatter the light, causing the image to “eject” from the surrounding liquid.

The current system is driven by a single color, but the team believes that the projector can focus different colors at the same time on different parts of the image to create multiple color images.

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