Galactic Tech Empire

Chapter 186 Three Primary Colors

Galaxy science and technology research area.

Inside the Holographic Projection Research Institute.

Huang Haojie is currently testing the holographic projection chip with a large group of researchers.

There are currently three known holographic projection technologies 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. It projects an image on a mirror and then rotates the mirror at high speed to produce a 3D stereoscopic image.

The air projection technology uses water vapor to project images on the water vapor. Since the vibration between molecules is not balanced, a three-dimensional image can be formed.

The laser beam projection technology is the most complicated. When nitrogen and oxygen diffuse in the air, the mixed gas turns into a hot slurry and projects a 3D image in the air. However, the time shown by this technology very short.

The holographic projection chip of Yinhe Technology is an advanced version of laser beam projection technology.

When it comes to holographic projection, the most commercial scenario we think of is virtual idol concerts, such as Hatsune Miku and Luo Tianyi.

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

Although the virtual idol concert presents vivid stereoscopic images to the audience, it must be on a fixed stage and can only be realized in the dark, and the audience must watch it from a specific angle.

So how is the virtual idol concert realized?

It actually belongs to an optical illusion technique we call the Pepper's Illusion, which is often used in magic shows.

Its principle is not complicated. It uses a semi-transparent and semi-reflective film, the so-called transparent holographic film, as a medium to make the object become a virtual image in the film. Because it is semi-transparent, you can see it. The scenery behind the film gives people a three-dimensional illusion visually.

Coupled with CG technology (computer graphics technology) and high-brightness lights, this stereoscopic image will give the audience a vivid and real feeling.

Most of the so-called holographic projection technologies we see on the market are pseudo-holographic projection technologies based on Pepper's Ghost.

The advantages and disadvantages of the holographic projection realized 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 achieve 360°C, the audience must be in a relatively dark environment, and can see the stereoscopic image from a specific angle, and most of the 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 three primary color lasers on a silicon chip.

These three primary color lasers are very tiny, how small are they?
The size of each laser is a square with a side length of 2 nanometers, plus the distance between the lasers, a laser needs to occupy an area of ​​16 square nanometers.

On a silicon chip of 1 square centimeter, 6.25 million lasers of three primary colors need to be integrated.

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

At present, a popular saying in the laser industry is: as long as green lasers are added, the final performance and effect of the white light source system will be 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 cannot be popularized, and the complex structure of two-color lasers, LED and laser mixed light sources, etc., all of these affairs are green light-emitting devices.

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

For LED projection, under the background that red and blue LED devices are almost [-]% to [-]% cheaper than similar laser devices with the same brightness, the reason why LED light source projection has not been able to get out of its infancy lies in the performance of green LED devices.

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

For example, the LED light source, the brightness of the blue LED changes only 20% at 120 degrees and 10 degrees, but the brightness of the green LED changes by 40%, which leads to the color shift of the white light system with green LEDs during the temperature change.

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 LED light source or laser light source is largely determined by which technology first breaks through the green bottleneck.

The green bottleneck is not only a problem of projection technology, but also the bottleneck of other three-primary-color semiconductor lighting fields.

The three-primary-color laser produced by Huang Haojie is made of a new material.

This three-primary-color stress material will generate five-color laser light through different magnitudes of voltage and current, and these five colors include the three primary colors of red, green and blue.

The first layer above the silicon wafer is integrated with three primary color lasers, and there are 71 layers of 1-nanometer-level integrated circuits below, including 7 trillion transistors.

On this chip with an area of ​​1 square centimeter and a thickness of 180 microns, 6.25 million three-primary-color lasers and 7 trillion transistors are integrated.

A temporary holographic projector is placed on the workbench.

This holographic projector looks like a digital 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 the operating system." Huang Haojie ordered.

The researchers on the side imported the Taiwei system into the holographic projection chip through a wireless import method on a computer.

As the introduction started, the holographic projector placed on the workbench suddenly started up.

On the surface of the chip invisible to the naked eye, countless lasers were instantly activated, and a scene like an aurora appeared above the workbench for a while.

The colorful light spots occupy a space with a side length of about 2 meters and a volume of 8 cubic meters. This space is full of brilliance.

But after three or four minutes, the chaotic light spots began to show regularity and outline.

Gradually a lifelike display screen appeared in mid-air.

"Test whether the laser emitted by the laser will harm the human body."

"Ok."

The researchers are busy with testing work. In this laboratory, there are a total of ten holographic projectors that have been produced, and various testing work is proceeding 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 really put into the market, 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, there is a high possibility that the people next to him will see the content of the holographic projection screen.

To solve this problem, it is necessary to adopt user gaze tracking, present the clearest picture of holographic projection in front of the user's eyes, and at the same time blur the sight of non-users.

To put it simply, the picture that the user sees is clear, but the picture that the non-user sees is blurred.

The second problem is the operational problem.

The holographic projection technology invented by Huang Haojie is an air medium holographic projection, that is to say, 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, gesture, sound, and brain wave.

First of all, the elimination of brain waves is not because Galaxy Technology cannot do it, but because the brain wave control system will cause social concerns and is not suitable for launch at the moment.

Keyboards, gestures, voices can all be considered.

(End of this chapter)