The second cats mobile phone began mass production, and Hang Yu personally went to the factory to observe.

He wasn't very interested in the assembly shop, so he took a few casual glances and came to the screen manufacturing factory. Because it is a dust-free workshop, you need to wear dustproof clothes, hats, shoes and gloves before entering, and go through two disinfection procedures.

The production of civil LCD is only an assembly process, and the LCD panel, main control circuit, shell and other parts are mainly installed, and there will basically be no too complex technical problems.

Hang Yu invested so much money, of course, it was not as simple as being an "assembler".

In fact, it's the raw materials that are the hardest to do.

The general structure of the LCD panel is divided into a backlight system, including a backlight plate, a backlight, a diffusion plate, a diffusion sheet, and so on.

Since liquid crystals do not emit light, they need to be illuminated by other light sources, which is where the backlight system comes in. However, the CCFL lamp or LED backlight currently used does not have the characteristics of the surface light source, so components such as light guide plate and diffuser are needed to make the light of the linear or point light source uniform to the whole surface, so that the luminous intensity of different points on the whole surface of the liquid crystal panel is the same.

However, it is very difficult to achieve the ideal state, and the only way to minimize the unevenness of brightness is to minimize the design and workmanship of the backlight system.

The cats use LED backlighting, which is also used by Apple.

From the outside to the inside, the LCD panel is a horizontal polarizer, a color filter, a liquid crystal, a TFT glass, a vertical polarizer, in addition to a driver IC and a printed circuit board on the side of the LCD panel, which is mainly used to control the rotation of liquid crystal molecules in the LCD board and the transmission of display signals.

The liquid crystal panel is thin and translucent when not energized, and its general structure is like a sandwich, with a liquid crystal sandwiched between the lower layer of TFT glass and the upper layer of color filter.

The production of an LCD panel requires three complex processes: front-end array process, mid-cell process, and back-end module assembly.

The front-end Array manufacturing process of LCD panel manufacturing is mainly composed of four major processes: "thin film, yellow light, etching, and film stripping".

First of all, the movement and arrangement of liquid crystal molecules need to be driven by electrons, so on the carrier of liquid crystal, TFT glass, there must be a part that can conduct electricity to control the movement of liquid crystals.

ITO is transparent and also forms a thin film conductive crystal so that it does not block the backlight.

The different arrangement of liquid crystal molecules and the rapid movement change can ensure that each pixel accurately displays the corresponding color, and the image changes accurately and quickly, and the film needs to be specially processed, just like a printed circuit on the PCB board, and a conductive circuit is drawn on the entire liquid crystal board.

........................ There are also N procedures in the back, because most of them are completed inside the closed equipment, so Hang Yu can't understand the specific process, so he can only listen to the engineer's explanation.

The engineer said a lot of technical terms, but Hang Yu didn't understand a few, just nodded.

Looking at the entire manufacturing process, it took him more than an hour, and Hang Yu gained a little more knowledge. When he walked out of the workshop, Hang Yu breathed a sigh of relief, it seemed that he was right not to choose science and engineering.

"I didn't expect the manufacturing process of a display screen to be so complicated, no wonder there are no self-developed manufacturers in the country, no wonder the chip is completely dependent on imports, we will develop chips in the future. Hang Yu said with emotion.

"In fact, we are not completely independent research and development, and some materials still need to be imported. If you want to completely develop independently, I estimate that you will have to invest billions or even tens of billions more, and the more you go to the back, the more difficult it becomes. Tan Zongqin said.

"Take your time, nothing you can do with money is a problem. Hang Yu said generously.

What are you doing with so much money, isn't it just for research and development.

"Let's go, let's go to Boss Wang's side again. Hang Yu said.

"Good. Tan Zongqin nodded.

Wang Zhifeng's mobile phone case manufacturing plant has also started, the technology is provided by Jiangyan Company, and the quality of the finished product meets the requirements, so Hang Yu agreed to let him supply the second cat mobile phone.

Originally, after making money, he wanted to repay Jiang Yan's technical expenses. However, the technical cost was too high, Wang Zhifeng later thought about it, and simply let Hang Yu take the technology as a shareholder, occupying 56% of the shares.

Wang Zhifeng made this decision because he knew his strength and could not run this manufacturing plant well. The manufacture of mobile phone shells is not so simple, and technological innovation in the future is completely in the hands of Hang Yu.

Rather than being controlled by others, it is better to cooperate for a win-win situation.

The main reason is that Jiang Yan Company is a big backer, and Wang Zhifeng decided to hug Hang Yu's thighs tightly. What is a shell manufacturing factory, Wang Zhifeng can see it, as long as he follows Hang Yugan, he still has a chance to make a fortune.

Wang Zhifeng is not in the factory, and the manager is Wu Tingzhen, who is responsible for management.

Wu Tingzhen is a relative of Wang Zhifeng, in her forties, has studied in college, and her management skills are okay. The reason why she was asked to be a manager was because Wang Zhifeng trusted her, and if she just looked at her ability, she would definitely not be enough.

"Dong Hang, Mr. Tan, welcome the two of you. "Wu Tingzhen is very good at talking.

"Manager Wu, please take us to see the assembly line. Tan Zongqin said.

"No problem, please come with me. Wu Tingzhen led the way.

The enclosure manufacturing plant is noisy and the automation is quite high.

They use a combination of CNC and die-casting processes, the middle frame of the mobile phone is milled into a specific shape by a CNC machining center, and the die-casting is the use of a mold cavity to apply high pressure to the melted metal, and the fluid metal die-casting is stamped into a solid metal shell or middle frame.

The cost of the all-CNC process is higher, the material waste is more, and of course, the quality of the middle frame or shell under this process is also better.

The principle of die-casting is not to waste, save time and cost, but it is not conducive to the later anodizing process, and may also leave small problems that affect the quality and appearance.

First, the raw material aluminum alloy is made into a rough billet, and after machine tool processing, the excess part is washed out, and the burr is grinded off, and the shell can be seen to be basically formed. The small holes on the back cover are CNC machined for injection molding and reinforcement of the body.

After the injection molding is completed, it is sanded again, and the next step is the painting process.

The process of painting is also a technical task, and there is a clear dividing line between the plastic and metal parts of the back of the phone, and if the painting process is not good enough, this dividing line will still be visible.

Therefore, whether you can see the dividing part between metal and plastic is an important indicator to judge whether the painting process is good or not. The phone case below will slowly advance on the assembly line, and 8 groups of 16 nozzles will spray the case in all directions to ensure uniformity.

After the painting is completed, it is time to bake the paint, and the process of baking the paint is like a mushroom jungle below.

Painting and baking paint are generally not done at one time, but in multiple cycles.

And between the paint and the spray paint, there will be another sanding, and this set of phone cases will eventually go through 5 spray paints, 5 baking paints and 2 sandings. Usually the first coat is primer, and the last coat will add pearlescent powder or aluminum powder to the paint to ensure the texture and appearance.

"Here are the cutouts for the volume buttons, headphone jacks, cameras and other departments, and the holes are diamond cuts. Look, the edges of the cut shell already have a good sense of highlights. Wu Tingzhen introduced.

Hang Yu picked up a finished product and touched it with his hands, and there was no flaw at all.

He nodded, satisfied with the level of craftsmanship.