$ 10 – issue price: cheap holographic displays of the future




$ 10 – issue price: cheap holographic displays of the future


Three-dimensional holographic displays have been a dream of lovers of technology for decades. In the past few years has achieved some success – and here you Displair, and prototype Holoflector from Microsoft, and every attempt to create a telepresence .

Conceptual apparatus and scientific developments – is one thing, but the user device is quite another matter. Let the world know the power of holography, it should be as cheap as, for example, the display technology today. But this is not happening. Recently, however, a team of researchers at the Massachusetts Institute of Technology (MIT) has found a way to create a holographic display for just $ 10. Other devices cost thousands of dollars.

Idea submitted by Daniel Smalley, a graduate student at the MIT Media Lab and the lead author of a paper published in Nature last week. He created a color holographic video display, such as clear as the standard television displays, and with the same refresh rate.

If everything goes like clockwork, Smalley and his team hope that holographic TVs and smartphones will become a reality.

To create a hologram, typically a laser. Beam covers a person or object that you want to convert to image. After the beam is split and one half is still on target. The beam is reflected from the object and hits the photographic plate. The other half of the beam will not shoot, also falls on a photographic plate.

Two beams interfere with each other and create a pattern on a wafer. Ripples scatters light falling on it so that it reproduces the original picture. Since scattering is called diffraction varies with the angle of view, it creates the illusion of 3D-image.

Create a holographic video is difficult because to get the same light-scattering effect, it is necessary to control the wavelength of light emanating from each pixel. In addition, pixels in the image must be close to the size of the light waves, so there is no technology that would cost pennies – a very expensive process.

To solve this problem, Smalley use the crystal material called lithium niobate. Underneath the surface of the crystal are tiny channels which limit and guide the light passing through them. Each channel or waveguide, has a small electrode, which is slightly distorted crystal shape. Lithium niobate crystal – piezoelectric, ie it can change shape when a current flows through it.

Due to the presence of the electrode, some light wave filtered and others tested. It creates the same effect of scattering required to create 3D-image.

Since each pixel of one waveguide is needed instead of three (one for each of the primary colors), the cost is significantly reduced and the use of relatively simple crystals times reduces costs. One-pixel system also allows faster update image and reduces energy consumption. The waveguide itself is also not new, they are frequently used in all kinds of electronics, coupled with communication.

The image was first obtained by the team at the experimental device is updated with a frequency of five frames per second and has a resolution of about 420 by 420 pixels with a depth of 156. The next prototype will improve performance by four times.
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Tags: MIT , Hologram , Displays .


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