Galaxy Science and Technology Research Zone.

Inside the Holographic Projection Institute.

Huang Haojie was testing the holographic projection chip with a large group of researchers at this time.

At present, there are three types of holographic projection technology known in the world, namely 360-degree holographic display technology, air projection technology, and laser beam projection technology.

Among them, the 360-degree holographic display technology is the easiest to understand, which is to project the image onto the mirror, and then let the mirror rotate at high speed to produce a 3D stereoscopic image.

Air projection technology uses water vapor to project images on water vapor, and because the vibrations between molecules are uneven, a three-dimensional image can be formed.

The most sophisticated is laser beam projection, which uses nitrogen and oxygen to disperse in the air, and the gas mixed into a hot slurry substance, which projects a 3D image in the air, but this technology shows a short time.

Galaxy Technology's holographic projection chip is an advanced version of laser beam projection technology.

At present, when it comes to holographic projection, the commercial scene that comes to mind the most is a virtual idol concert, such as Hatsune Future and Luo Tianyi.

But unfortunately, they are all pseudo-holographic projections, not true holographic projections.

Although the virtual idol concert presents the audience with lifelike stereoscopic images, it must be on a fixed stage, in the dark, and the audience must watch from a specific angle.

So how does a virtual idol concert come about?

It's actually an optical illusion technique that we call Pepper illusions, and it's often used in magic shows.

Its principle is not complicated, it is the use of a semi-permeable and semi-reflective film, that is, the so-called transparent holographic film, as a medium, so that the object becomes a virtual image in the film, because it is translucent, so you can see the scene behind the film, visually giving people a three-dimensional illusion.

Coupled with CG (Computer Graphics Technology) and high-brightness lighting, this stereoscopic image will give the viewer a vivid and realistic feeling.

The so-called holographic projection technology we see on the market is mostly pseudo-holographic projection technology based on Pepper's illusion.

The advantages and disadvantages of holographic projection achieved by this technology are very obvious.

The advantage is that the technical principle is simple and easy to implement; The disadvantage is that it cannot be 360°C, the audience must be in a darker environment, and from a specific angle from the stereoscopic image, in addition, the vast majority of projectors must be fixed and adjusted.

As for the real holographic projection technology, it is still lying in the laboratory.

The holographic projection chip designed by Huang Haojie is to make a three-primary color laser on a silicon wafer.

These trichromatic lasers are very tiny, how small are they?

Each laser size is a 2 nanometer square on each side, plus the spacing between the lasers, a laser needs to occupy an area of 16 square nanometers.

On a 1 square centimeter wafer, 625 million trichromatic lasers need to be integrated.

The three-color laser can be said to be the core technology of Huang Haojie's holographic projection chip.

A popular saying in the laser industry is that as long as a green laser is added, the final performance and effect of the white light source system is almost completely determined by it.

This applies not only to laser light sources, but also to LED light sources.

In fact, high-brightness LED projection can not be popularized, the complex structure of two-color laser, LED and laser hybrid light source, etc., the lifeline of these affairs is all in the green light-emitting device.

For laser projection, the current performance of green lasers can be described as three core bottlenecks: low light output power (less than half of the red and blue laser semiconductors), lower luminous efficiency (less than half of the red and blue laser semiconductors), and temperature sensitivity (luminous efficiency and lifetime decrease faster with the increase of temperature).

For LED projection, in the red and blue LED devices, almost cheaper than similar laser devices of the same brightness, the reason why LED light source projection has not been able to get out of its infancy is in the performance of green LED devices.

The core bottleneck of green LED is basically the same as that of laser green light source, which is also the three major problems of "low light output, lower luminous efficiency, and temperature sensitivity".

For example, for LED light sources, the brightness of blue LEDs varies by only 10% at 20 degrees and 120 degrees, while green LEDs have 40%, which leads to a shift in the color of the white light system with green LEDs during temperature changes.

At present, the research and development of high-efficiency green lasers or LED light sources has become the core task of the semiconductor light source industry.

In fact, whether the future of projection is an LED light source or a laser light source is largely determined by which technology breaks through the green bottleneck first.

The green bottleneck is not only a problem for projection technology, but also a bottleneck in the field of other trichromatic semiconductor lighting.

The three-color laser made by Huang Haojie was completed by a new material.

This three-color stress material, through different sizes of voltage and current, will produce five colors of lasers, including red, green and blue.

The first layer above the silicon wafer is the integrated trichromatic laser, and below there are 71 layers of 1-nanometer integrated circuits, containing 7 trillion transistors.

This chip, which has an area of 1 square centimeter and a thickness of 180 microns, integrates 625 million trichromatic lasers and 7 trillion transistors.

A makeshift holographic projector sits atop a workbench.

This holographic projector is a thing that looks like an electronic watch.

In order to avoid damage or dust on the surface of the chip, the surface of the chip is covered with a high-strength graphene film.

"Import Operating System." Huang Haojie commanded.

The researcher on the side introduced the Ethermicro system into the holographic projection chip through wireless import on a computer.

As the import began, the holographic projector, which was placed on the workbench, suddenly started up.

On the surface of the chip, which is invisible to the naked eye, countless lasers are activated in an instant, and for a while, a scene like an aurora appears above the workbench.

The colorful light spots occupy a space of about 2 meters on each side and 8 cubic meters in volume, and this space is full of light.

After three or four minutes, however, the jumble of light spots began to take on patterns and contours.

Gradually, a lifelike display appeared in the air.

"Let's test whether the laser emitted by the laser will cause harm to the human body."

"Okay."

The researchers are busy with the test work, and in this laboratory, there are a total of ten holographic projectors that have been made, and the test work is being carried out in an orderly manner.

Huang Haojie quietly watched them busy, then turned his chair to think about the holographic projection technology.

If holographic projection technology is to really be put into the market, then some problems must be solved.

The first is the issue of privacy, if a person turns on the holographic projection screen in a public place, then there is a high probability that the person next to him will see the content of the holographic projection screen.

To solve this problem, it is necessary to adopt user gaze tracking, which presents the clearest picture of holographic projection in front of the user's eyes, while blurring the vision of non-users.

To put it simply, the picture that the user sees is clear, while the picture that the non-user sees is blurry.

The second problem, and that is the operational problem.

The holographic projection technology invented by Huang Haojie is a holographic projection of air medium, which means that it can be displayed in the air.

In this way, how to operate the holographic projection screen is a problem.

There are four ways to solve it, keyboard, gestures, voices, and brain waves.

First of all, the brainwave exclusion is not that Galaxy Technology can't do it, but the brainwave control system, which will cause social concern and is not suitable for launch for the time being.

Keyboards, gestures, voices can all be considered.

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