Rebirth of Northland Technology

Today is Yuan Shuai's evening shift.

During this period of time, the energy of optoelectronic scientific research has turned to the production process of large LED screens.As the basic raw material for large-screen LEDs, LEDs of various colors are the top priority.

The main force of the production line is mainly from a group of workers seconded from the internship factory.Philip's production line is still under construction, and they are working here, which can be regarded as a process of advance training.

Members of the LED team were also mobilized to participate in the production of some processes.Since students have courses, there are more people who apply for evening classes.

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Yuan Shuai has been back for almost three months. He went home after the Spring Festival and went back again some time ago.These few times, the whole family has been discussing about studying abroad.The opinions of the family still hope that he can seize the opportunity.It would be a pity if I missed this opportunity.

Therefore, he has already started going abroad.The procedures for him and Zhao Mengjia are relatively easy, just a transfer.He will report to the United States next semester.

Some time ago, Yuan Shuai received 5,000 US dollars in dividends.He kept 2,000 of this money, and the remaining 3,000 was returned to Cheng Yongxing.It is said that the money will be converted into stocks.Although Yuan Shuai didn't quite understand what the stock was.

The 2,000 dollars are left because of the preparation of air tickets to the United States.Although Hao Yunli promised to lend him part of the living expenses.But if you can pay by yourself, there is no need to borrow money.It is not easy for Hao Yunli to make money in the United States.

Yuan Shuai, as well as a few classmates in the same class, felt strange to Hao Yunli's development.

He has been helping Cheng Yongxing in the experiment for almost two years, but it is his turn and he has no idea at all.He never understood how Hao Yunli started to preside over the experiment?

Recently, Shuai Yuan and his classmates are also participating in the preparation of some papers, but everyone’s work is more about recording, sorting, and analyzing.I can't talk about it if I find the topic myself.

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Some time ago, the resumes sent by the girls through various channels have been answered one after another.Among them, Feng Yan and Lin Ting have obtained quasi-trust through Hao Yunli's relationship.

The two of them can transfer to the US next semester!

This news shocked everyone!It turns out that you can apply to study abroad by yourself!

Thanks to this news, all the students in the class rushed to the LED group.Everyone signed up to participate.Several people in the bedroom have now joined the LED team.

The people in the dormitory have not been serious in class recently.Everyone is busy writing resumes and learning English, as if everyone can go abroad.

In the past few days, Yuan Shuai didn't do anything else, he just helped his classmates write resumes.

No matter what Yuan Shuai said, he did not write less English papers, and he went to the United States for more than three weeks.Compared with those who joined the technology group later, their English level is much higher.

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In order to prepare for the upcoming LED technology conference, relevant majors are also preparing for each.

The LED team located in the center of the tuyere has also been given high hopes.

In the fields of blue, red, and green light, the LED team has been cooperating with teachers in the Department of Materials to improve product brightness.

The results of these work will be sorted into papers and read out in the conference.

This batch of papers and topics has become the goal pursued by everyone.

In this atmosphere, the classmates began to skip classes on a large scale.But they all fled to the optoelectronic laboratory, and everyone cried and shouted to be exploited.Instead, Yuan Shuai was pushed aside.

I heard that several classmates are planning to start three classes.The shift in the latter half of the night will also be started to speed up the production schedule.

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With the investment of more scientific research forces, coupled with the optimization and improvement of related equipment and technology, the brightness of various color LED products produced by optoelectronic research and production is gradually improving.

The fastest increase in brightness is the blue LED.In a pixel combination, only a single blue LED is enough.

This result, for researchers, represents a new achievement and a new paper.But for mass production, it is a disaster.

After the new formula is applied, or after the production equipment is improved, it is natural to use the new technology for production.In this way, a problem arises.What about the previous products?

The brightness of the LEDs produced in the previous two batches is different, and it is impossible to put them together.

Therefore, every time some new technology or new formula is adopted, it will bring part of the work to re-derive.

This kind of constant overthrowing occurs not only on blue LEDs, but also on red and green lights, but it happens more slowly.

However, with the gradual approach of the conference date, this process upgrade was finally stopped.If you continue to upgrade, this big screen will never be released.

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The cafeteria has opened after four o'clock.Yuan Shuai finished the meal quickly and came to the laboratory.The workers on secondment from the electronics factory are preparing to get off work. The two sides briefly handed over, and Yuan Shuai started work.

The equipment that Yuan Shuai is responsible for is a laser cutting machine.It is said that it is the world's first chip cutting equipment using laser, which is more than a generation more advanced than traditional diamond cutting.

This equipment also bears the important task of "overtaking on a curve" that Cheng Yongxing has been thinking about.

Yuan Shuai has never seen what a diamond cutting machine looks like, and cannot judge the quality of this equipment.His main job is to continuously calibrate this equipment.

Every once in a while, he needs to observe the position of the laser knife through the lens, and then fine-tune the trajectory of the laser knife according to the deviation.Wait for him to adjust the position, and then let the machine run for a short distance.So back and forth.

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In this laboratory, other students also started their own work.The equipment that everyone is responsible for varies.The one that Yuan Shuai is in charge of is not the most important.

The most important is MOCVD.This kind of equipment is important because its output is very low and can only be produced in a few hours, so it has become a bottleneck in the production line.

In order to solve this bottleneck, the optoelectronic laboratory borrowed two MOCVDs from the MEMS laboratory to run together to solve this problem.That's it. In addition to two shifts, these MOCVDs also automatically run half shifts in the middle of the night.

There was another bottleneck in the laboratory, and that was the lithography machine.In the beginning, the optoelectronics research used two lithography machines with unknown accuracy.But their accuracy is really too deceptive.

Wafer epitaxial wafers, which had a low output, were so wasted. Millions of LEDs became an impossible task.

The two machines were finally sent away altogether and given to the electronic laboratory for nothing.

The two in the house are made in Sichuan, and they are said to have an accuracy of 20 microns.

Not all LED production processes are in this laboratory.With the gradual increase in equipment, the rooms are becoming more and more crowded.Some packaging processes were simply moved to an ordinary room next to the laboratory.

However, those processes do not need to work overtime, and one shift during the day is enough to meet the needs of production.

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"How is the data today?"

Just when Yuan Shuai was drowsy by his boring work, Li Xiao's voice rang in his ear.Li Xiao works in the Laser Institute. Sometimes people call her Senior Sister and sometimes Teacher Li.

"It's OK! The deviation this week is smaller."

"Show me the data."

Li Xiao took the record book in Yuan Shuai's hand and looked it up.

This device can be regarded as the result of joint research and development of the Optoelectronics Research Institute and the Laser Institute of the University of Technology.Every once in a while, she will come to inquire about the actual usage data of this device.

Based on these data, everyone will continue to fine-tune various parameters, or simply modify the design of the machine, so as to continuously improve the accuracy of the equipment.

These operating data in the actual production process are also the basic basis for the next generation of equipment designed by laser.

This manual production line is also responsible for verifying many prototype devices.

"How? Are you planning to modify the machine this week?"

When someone talked to him, Yuan Shuai felt a little more energetic.

"No. That's it. It doesn't make much sense to change it. Even if this model is finalized. Our main energy is still in the development of subsequent models."

This cutting machine, matched with a 20-micron lithography machine, is just right.There is no need to make the equipment on this semi-manual production line too high-grade.

The LED conference is about to be held soon, and the Li Xiao R&D team has turned to the R&D of the next generation of laser cutting machines. The main purpose is to work harder on ease of use.

The cutting machine in front of us has too many manual operations and the machine has been shut down and waited for too long. These have room for optimization.

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Traditional diamond cutting, because it is a physical cutting, is limited to physical tools at first, and the accuracy cannot be too high.Secondly, due to the scratches of the physical tools, considerable protection space must be reserved on both sides of the chip.

Coupled with the current level of automatic control, if laser cutting is not used, it is difficult for the accuracy of the LED chip to achieve the equivalent level of 50 microns!

Laser cutting technology is the key to increasing the accuracy of LED chips to 20 nanometers.

After adopting laser cutting, the productivity of this simple manual production line is nearly 4 times higher than that of the most advanced production line in the world!

And this technical route, the room for continued improvement, is far from an end in sight.At least as far as we can see, the accuracy of 5 microns is no problem at all.No matter how high the precision is, theoretically feasible, but there is no lithography machine with this precision in China!

The design idea of ​​this device also gave Li Xiao a lot of inspiration.

Manual correction is used instead of automatic detection and feedback correction system.Such a simple change has reduced the cost of the entire device by more than 23!Not to mention the manufacturing difficulty and cycle involved here.

If it is a fully automatic device, let alone a month, it is a year. It is a dream to produce samples.

This design idea runs through almost all processing equipment used in the photoelectric production line.In the national trend of superstition in automation and blind worship of imported equipment, it can be regarded as an out-and-out mudslide.

Of course, at this time, Li Xiao still didn't know that Cheng Yongxing's ideas came from image recognition technology.It's just that human eye recognition is used here.

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"When will the new model leave the factory?"

After experiencing the boring operation firsthand, students generally have expectations for upgraded equipment with a higher degree of automation.

"It's coming, at least before the conference, you can see it."

"It's so late! We don't need it at all!"