Why is the naked-eye 3D LED display so popular?

In March 2020, the naked-eye 3D LED display of “Ocean Wave Fish Tank” made a low-key appearance at the SM Building in South Korea, but it aroused heated discussions among many netizens. The artwork, called Wave, is reported to have been tailored by South Korean creative firm d’strict for the curved display in the SMTown building.

With the right size, the virtual and real visual effects, and the simulated sound of waves, passersby can’t help but worry that the waves will really break through the glass and drown the city. Realistic and very eye-catching.

On January 3 of the same year, on the occasion of the National Day holiday, the “naked eye 3D spaceship” was launched on Chunxi Road, Taikoo Li, Chengdu, and then large naked eye 3D LED screens appeared all over the country, quickly plundering the outer walls of major commercial buildings.

In fact, 3D glasses-free technology is not a new product. A few years ago, Sharp, HTC and many other manufacturers launched products equipped with naked-eye 3D display technology on electronic products, but there was no big wave at that time. At present, the outbreak of 3D screens is mostly caused by the investment of marketing expenses.

Its sustainability usually depends on the cost of promotion and marketing. It’s the same with most influencers these days. It is good to be popular for 1-2 years. Most influencers tend to last less than a year. , because once the marketing company has a new target or idea, it gets replaced, and then there’s no news.

outdoor LED display
outdoor LED display

The realization principle of 3D LED technology

3D naked eye technology is actually not mysterious, it essentially uses the parallax characteristics of the human body. The distance between the human eyes is about 6cm. When we look at an object, the two eyes look at the left and right viewpoints respectively. The two eyes see slightly different images. When they stack up, the brain defaults to them. Should overlap and be sharp, this binocular parallax gives us a sense of depth and space.

3D screens take advantage of this feature, consisting of an opaque layer and a series of precisely spaced slits that allow the viewer to see different pixels in both eyes.

This feature is doomed to its downside, the viewer has to be in the right position to experience 3D immersion. Therefore, most naked-eye 3D screens that have become popular in recent years are composed of two faces with different angles. The front of the two screen corners can see the side and front of the object at the same time. With the animation material of a specific perspective, a false frame is set in the animation to create a strong sense of scene.

Here I have to talk about a little in-depth 3D LED display principle, which will be more conducive to our understanding of the 3D concept. First imagine such a 3D display device, which can solve the current passive 3D display mode. Displays the problem of halving the screen resolution.

In order to achieve the above purpose, we try to invent a technical solution to solve this problem. Here we can provide a 3D display device including an LED display, a magnetic field device and a signal module. The magnetic field device is arranged in front of the light-emitting surface of the display screen, and the magnetic field device and the signal module can be directly connected;

When the signal module provides a changing current signal to the magnetic field device, the magnetic field device will generate a changing magnetic field corresponding to the adjacent changing current signal, and the changing frequency of the magnetic field is synchronized with the refresh frequency. The left and right eyes of the LED display.

3D LED display
3D LED display

The rotation direction of the magnetic field reaches the polarization plane and activates the linearly polarized light emitted by the LED display screen, so that the polarization plane direction of the rotated linearly polarized light is parallel to the polarization plane direction of the display screen.

The linearly polarized light before rotation is perpendicular to the direction before rotation. The direction of the plane of polarization of linearly polarized light. Switches back and forth between the orientations of the plane of polarization of linearly polarized light.

In another aspect, a method of operation of a 3D display device is provided, comprising a signal module for providing a varying current signal to a magnetic field device. The magnetic field device generates a changing magnetic field according to the changing current signal, and the changing frequency of the magnetic field is consistent with the LED display. The refresh frequency of the left and right eyes of the screen is synchronized to form a 3D display effect.

Therefore, behind some seemingly stunning display effects, there are countless technical polishing and strong product support. Through this slightly in-depth 3D principle, we have a further understanding of the display of 3D LED technology.

Generally speaking, the principle of 3D naked-eye technology is not complicated, but its excellent visual presentation and marketing promotion alone are not enough to make it so popular. The real reason we need to trace from the media.

When people receive information, they need to go through a medium, and the medium is generally divided into two types: physical medium and non-material medium.

From primitive man’s paintings on cave walls to today’s prints, these stable entities are known as physical media, while the opposite non-physical media are primarily digital. The biggest difference between hand-painting and board painting is not only the change of painting tools, but the virtual digital “bits” as new materials and tools to replace physical “atoms”.

The occupation on the opposite side of the 3D screen precisely reflects the aggression of digital media over physical media. From independent building facades to 2D screens to 3D screens, from two-dimensional planes to three-dimensional, we are moving towards an era of faster and faster information transmission.

When traditional media receive information, we need to mobilize our five senses and imagination. The mobilization of senses and the transmission of ideas finally complete the process of receiving information. Different from three-dimensional digital media, people’s association with information is weakened.

Since three-dimensional people live in four-dimensional space (including the time dimension), people mainly perceive the world as three-dimensional through vision and body, including appearance textures such as color, material, and gloss, as well as intricate appearance textures. The internal structure and dynamic dynamics of space and time, any primordial impulse that leads us to discover and create the world is three-dimensional.

Stereoscopic people can comprehend stereoscopic scenes almost without thinking, mobilizing primitive and direct emotions. Compared to 2D, the missing dimension seems to remind us all the time that this is the virtual content presented by the screen. Therefore, 3D media can connect the real and virtual worlds, which 2D media cannot. This is also the main reason for the outbreak of naked-eye 3D LED displays.

Technology is only the carrier of the medium, it is just a container. It is not necessarily this technology that is sought and needed. More appropriately, we need an experience, and the 3D naked-eye screen provides this experience – the extraordinary in the everyday, the unreal in the real.

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