General, Research, Technology

How it works? | Holographic display

The first hologram was obtained by Hungarianphysicist Denesh Gabor in 1947 during experiments to increase the resolution of electron microscopes. He coined the word “hologram” itself, wanting to emphasize a complete record of the optical properties of an object. Denesh was a little ahead of his time: his holograms were of poor quality due to the use of discharge lamps. After the invention of ruby-red and helium-neon lasers in 1960, holography began to develop rapidly. In 1968, the Soviet scientist Yuri Nikolaevich Denisyuk developed a hologram recording scheme on transparent photographic plates and received high-quality holograms. And 11 years later, Lloyd Cross created a multiplex hologram consisting of several dozen camera angles, each of which can be seen only from one angle. How does a modern holographic display work - this is in today's issue!

As for holographic displays, thenThere are several promising developments that deserve attention. RED Digital Cinema is working on a holographic display, which is a liquid crystal panel with a special light guide plate located under it. It uses diffraction to project different images at different viewing angles, which leads to the illusion of a “three-dimensional image”. A Hydrogen smartphone with a holographic display is due out in the first half of 2018.

HoloVisio brand displays already exist on the marketfrom the Hungarian company Holografika. The essence of their technology is to project the image with two dozen narrowly projected projectors, so that the image is laid out in space deep into the display. The complexity of this technology affects the price: the cost of a 72-inch screen with a resolution of 1280 by 768 pixels is about 500 thousand dollars.

And the union of Japanese scientists for a long timeworking on the creation of laser projection technology Aerial 3D. They abandoned the traditional flat screen, painting objects in three-dimensional space using laser beams. Aerial 3D uses the effect of excitation of oxygen and nitrogen atoms by focused laser beams. Currently, the system is capable of projecting objects consisting of 50,000 points with a frequency of up to 15 frames per second.

Noteworthy is the development of Microsoft underVermeer, which is a holographic screenless display and video camera that gives the system touch functions. The display uses projection technology between two parabolic mirrors. The laser beam draws an image with a frequency of 2880 times per second, sequentially passing through 192 points. As a result, the viewer sees in space a picture updated 15 times per second and available for contact.

It is possible that already in the near future, holographic screens will become more accessible and will be widely used.

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