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How the naked eye 3D screen fools your eyes?

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How the naked eye 3D screen fools your eyes?
How the naked eye 3D screen fools your eyes?

Since 2020, naked-eye 3D large screens have gradually entered the public eye. From the wave tank in Seoul, South Korea, to the spaceship in Taikoo Li, Chengdu, to the three-color cat in Shinjuku, Tokyo, naked-eye 3D screens have attracted the attention of countless people around the world. Compared with traditional 3D displays that require glasses or helmets, naked-eye 3D screens that can be viewed without equipment seem to have a natural advantage. However, is the naked-eye 3D screen behind technological progress or a visual scam? As a naked-eye 3D screen practitioner, today I would like to talk with you about what is going on with the naked-eye 3D screen.

human eye parallax

How to trick the eyes into creating a 3D sense?

As early as 1839, British scientist Winterston was thinking about a question – “Why is the world observed by human beings three-dimensional?” The viewing angle of the object is slightly different, which creates binocular parallax.

The left eye sees the left side, the right eye sees the right side, and there is a slight difference between the pictures seen, and the objects are imaged on the retina at the same time. feel.

How the naked eye 3D screen fools your eyes?

Stereoscopic imaging principle

The effect that causes this stereoscopic feeling is called “visual displacement”, and it is this visual displacement that enables us to distinguish the distance of objects and obtain a deep stereoscopic feeling.

When viewing an object with two eyes at the same time, each point on the object has an opening angle for both eyes. The closer the object is to the eyes, the larger the opening angle of each point to the eyes, and the greater the visual displacement; the farther the object is from the eyes, the line of sight of the two eyes tends to be parallel, and the visual displacement is close to zero, it is difficult for us to judge the object. distance, it will not produce a three-dimensional effect on it.

Looking at the starry sky at night feels that all the stars in the sky are on the same spherical surface, and it is impossible to distinguish the distance from the near. This is the result of zero visual displacement.

How the naked eye 3D screen fools your eyes?

visual displacement

Visual displacement is the basic principle for 3D movies to produce a three-dimensional sense: two cameras are used to shoot at the same time to obtain two synchronized images, and then polarized glasses are used to separate the content for the viewer’s left and right eyes, so that the The two eyes obtain different images of the left eye and the right eye respectively, so that there is a three-dimensional sense, and the feeling of a 3D image is presented in the brain.

3D Movie Principles

The naked-eye 3D screen also uses the parallax characteristics of the human eye to project the pixels corresponding to the left and right eyes to the left and right eyes respectively, thereby generating a three-dimensional image, allowing the viewer to feel the three-dimensional effect at a specific angle.

optical illusion

How to trick the brain into producing a three-dimensional sense?

The three-dimensional sense of the plan is caused by the “optical illusion” processed by the brain, or the brain complements the three-dimensional sense. When the brain processes a flat image, it generates a sense of distance and space through calculations. If the image does not provide enough information, the brain will actively help us fill in the depth when trying to judge the spatial depth of the image.

The cube in the picture below is a typical example of tricking the brain with its special shape and perspective.

Has this “pseudo cube” tricked your brain?

Just as painters use the distance, size, shadow effect, and perspective relationship of objects to construct a three-dimensional effect in a two-dimensional picture, which makes the brain misjudge the sense of space and depth of the picture, 3D video sources also use perspective and shadow relationships. Expand and confuse spatial perception, causing the human eye’s optical illusion, resulting in a three-dimensional effect that resembles the real one.

Plane sketches with fakes

Most of the flat naked-eye 3D screen video sources use the optical illusion of a prominent frame. When the brain selects an obvious frame as a distance reference, the dynamic image is suddenly occluded around the “front” and “back” of the frame, or the contrast between far and small, near and large. Prominent, forming the illusion of the brain’s distance judgment, resulting in a three-dimensional sense.

The white box in the picture below is used as a reference for the plane. When the seal crosses this line, it will make people feel “jumped out of the plane of the video itself”.

The seal is out of the frame to create a three-dimensional effect

At present, most of the naked-eye 3D screens of Internet celebrities are corner screens, which use two adjacent flat screens to present different sides of three-dimensional objects, and use the spatial perspective and the imaging properties of the adjacent two sides of the angled screen to cause light and shadow, light and shade, and virtual reality to the human eye. The visual illusion makes the content of the picture present a sense of volume.

The black area on the right side of the tiger on the corner screen in the picture below is also a part of the video source and is used as a plane reference, so that when the tiger is out of the frame, it will produce a stronger three-dimensional effect.

The naked eye 3D corner screen made by Yaham in Zhongshan City in 2015

Each 3D video source needs to be customized according to parameters such as screen shape, size and viewing angle. First determine the best viewing angle, then create video content that conforms to the perspective principle according to the viewing angle, and then locate the corners according to the cabinet layout of the display screen, and finally output a three-dimensional video source at a specific angle.

The effect of the object seen in reality going out of the screen, in the simulated three-dimensional space, the object really flew out.

Source: Yaham 3D scheme designer

Because the video source is created based on a 3D effect simulated from a specific angle of view, only when viewing the naked-eye 3D screen from a specific angle can the best three-dimensional effect of the angle of view be obtained. If you don’t stand at the best angle, the screen playback will be distorted. This is why most naked-eye 3D corner screens have the same shooting angle, because the best 3D effect can be seen only at a specific viewing angle.

Limitations of naked-eye 3D screen viewing angles

In order to achieve the perfect integration of the creative content and the real environment and create an immersive 3D experience, the designer needs to customize the video source that conforms to the perspective principle according to the on-site installation scene of the display screen. The more the boundary of the video content fits the real scene, the more realistic the three-dimensional effect will be to the audience.

Hardware Requirements for Glasses-Free 3D Screens

Display effect depends on screen hard conditions

From the perspective of hardware equipment, not all outdoor LED screens are suitable for naked-eye 3D effects. The display effect of the naked-eye 3D screen has high requirements for the fineness of the screen quality installation and the creativity of the realistic material. In order to present a better 3D video effect, the LED screen must meet at least the following three requirements.

Seamless transition: The mainstream 3D large screens on the market are mainly corner screens and curved screens, and a real seamless corner screen is better. The seamless transition can better integrate two adjacent large flat screens, bringing a visual experience with a stronger sense of space and volume.

Yaham pioneered the seamless corner design to avoid seams from destroying the display effect

High-definition picture: Outdoor high-definition large screen has become the development direction, 8K resolution and small pitch are becoming more and more mainstream, and the pitch has developed from the original P16, P10, P8 to P6, P3.9 and even P2.5. The smaller the spacing, the more delicate the screen display effect, and the more realistic 3D effect is presented.

Immersive effect: Compared with ordinary outdoor advertising screens, naked-eye 3D display screens pursue the stability of the picture and the authenticity of colors. Only with excellent screen quality can present more picture details and bring a more immersive visual experience. The naked-eye 3D screen with shocking effect often has the characteristics of “three highs”.

High refresh: 3840Hz and higher refresh to ensure higher picture stability;

High grayscale: 16bit (ie 65536 color changes) to ensure more delicate color changes to avoid chromatic aberration or fault;

High Contrast: Brightness up to 10000nits ensures that the picture remains visible in direct sunlight and presents more details and purer colors.

Glasses-free 3D screen trend

Competing for layout at home and abroad

At this stage, naked-eye 3D is mainly distributed in the CBD business circles of some medium and large cities, to achieve the purpose of draining the commercial body and creating urban landmarks.

For cities, the successful integration of 3D content and local culture will bring huge traffic and exposure to the city, creating a place for Internet celebrities to check in. As a trusted LED engineering service expert, Yaham has helped more than a dozen domestic first- and second-tier cities such as Shanghai, Shenzhen, and Guangzhou successfully realize the layout of naked-eye 3D screens in the past two years.

With the popularity of naked-eye 3D screens around the world, overseas customers also favor naked-eye 3D outdoor large screens. The United States, the Netherlands, the Philippines, Thailand and other countries can see Yaham naked-eye 3D large screens. Compared with traditional LED screens, naked-eye 3D screens with their own hot spots and traffic are obviously more popular with customers and advertisers.

However, when there are more and more cases of naked-eye 3D outdoor advertising and the content on the screen tends to be homogenized, high-quality display screens are the key to maintaining the popularity of naked-eye 3D screens, thus bringing continuous advertising benefits.

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