But in my impression, it seems that in the era of resistance screen, there is already film business. The typical model was the Nokia 5230. At that time, one of its major selling points was the 3.2-inch 16 million color 360 × 640 pixel touch screen. < / P > < p > and the screen, which looked gorgeous at that time, was a resistance screen. In other words, you need to use a fingernail, a stylus or other sharp object to click and slide accurately, which would cause people to worry about scratching the screen. < / P > < p > so, we came up with a smart solution, which is to put a film on the mobile phone. So we will be willing to spend 10 yuan, 20 yuan, looking for the mask master on the overpass to stick a layer of protective film for the mobile phone. < p > < p > at that time, the mobile phone film was still in the “primitive” stage, and the material used was pet. The film is thick, hard and very scratch resistant. Therefore, each time after the film, within two weeks, it was found that the film had been scarred. < / P > < p > until 2010, with the release of iPhone 4, HTC G7 and other mobile phones with large screen, clear appearance and expensive price, the mobile phone film market seemed to be active all of a sudden. Walking on the pedestrian street, you may find a film maker every 50 meters. < / P > < p > although apple, when launching the iPhone 4, stressed that it used Corning gorilla glass, which is very hard, wear-resistant and impact resistant. But because the mobile phone is too expensive, users are still willing to put a film on it and take good care of it. < / P > < p > and the iPhone 4 double-sided toughened glass design also inspired film manufacturers, so the “toughened glass film” came. In fact, it is a layer of toughened glass and a layer of AB glue, which can automatically absorb and prevent splashing after glass fragmentation; toughened glass replaces the previous PET material. A better glass film will also add a layer of oil repellent coating on the surface. So the toughened glass film quickly replaced the position of PET film and became the first brother in the film industry. < / P > < p > it can be said that 2010 is the first year of mobile phone film. With the fire of the mobile phone film industry, more and more film pasting masters are making a lot of money, and some even buy two suites with it. < / P > < p > interestingly, in recent years, manufacturers who have been pursuing the thinness of mobile phones and publicized how hard and reliable the screen is and how gorgeous the colors are, have quietly pasted “factory film” on mobile phones. Even if the film will affect the hand feel, reduce the light transmittance of the screen, and affect the speed of fingerprint identification under the screen, the manufacturers still do so. < / P > < p > but in my impression, it seems that vivo and oppo began to attach a high-definition film to the mobile phone when they leave the factory. After that, this practice spread rapidly in the Android camp, and manufacturers such as Xiaomi, Huawei, glory, Samsung, etc. also pasted films on new machines. Factory film, has gradually become a common thing. However, the operation of manufacturers is really confusing. At the same time, he emphasized that his screen has the advantages of Corning gorilla X-generation glass, scratch resistance, anti drop, nano oil repellent coating and 2.5D glass, while quietly covering the screen with a redundant film. < / P > < p > even some manufacturers have begun to take the mobile phone membrane as a selling point. For example, at the press conference of Xiaomi 10 supreme edition, Mr. Lei specially introduced that the mobile phone comes with “antibacterial” protective film. < / P > < p > for these confused behaviors, I consulted the staff of vivo, oppo, Xiaomi, Huawei, glory and Samsung respectively. On the question of why they want to paste the factory film on the mobile phone, they all reply that it is to prevent the screen from scratching. In addition to Xiaomi’s staff suggested to take the initiative to tear off the factory film after receiving the new machine, the staff of other brands suggested to keep the film. The so-called “high definition plastic film manufacturers” are not glass film manufacturers. The staff said that if you want to prevent scratching, you can keep the original factory film, but if you want to achieve explosion-proof and shatterproof effect, you still need to buy the toughened film by yourself. These answers all point to the word “scratch proof”. Thinking of the “scratch door” of the iPhone 11 screen, and the recent reports from many netizens that the screen of Huawei’s P40 series mobile phones is not scratch resistant, people can not help but wonder whether the screen of mobile phone is becoming more and more resistant to scratching? < / P > < p > referring to the iterative process of Corning gorilla glass, after the first generation of gorilla glass was launched in 2007, the first three generations have been committed to making the screen strong, wear-resistant and light. However, since the fourth generation, Corning has been committed to the improvement of anti fall performance. When the fourth generation product was launched, Corning said it had an 80% chance that it would be intact after falling from a height of about 1 meter; by the fifth generation, there was an 80% chance that it would not be damaged after falling from a height of about 1.2 meters. By the sixth generation, the safe fall height was raised to 1.6 meters. < / P > < p > during this period, the improvement of the screen in terms of wear resistance is relatively limited. Corning’s own test also shows that the scratch resistance of gorilla glass from the third generation to the sixth generation has not been significantly improved. Corning even said that its early glass had higher scratch resistance. This involves the principle of glass strengthening treatment. Johnson, a professor of materials science at Caltech, once explained that glass is usually strengthened by heating or chemical treatment. The flexibility of the strengthened glass increases, but the surface hardness may become worse, which leads to the decrease of scratch resistance. < / P > < p > in short, when glass is strengthened, it is usually easier to scratch. For curved screen, the flexibility may be higher than that of straight screen, and the scratch resistance may be relatively weak in theory. This explains why every generation of mobile phone screens emphasize the improvement of anti drop performance, but keep silent about scratch resistance. < / P > < p > it was not until the release of the seventh generation of victus that Corning was proud to claim that this generation of glass had improved both the drop resistance and the scratch resistance. < p > < p > Corning said that victus remained intact after falling from a height of up to 2 meters onto a hard, rough surface. At the same time, its scratch resistance is 4 times higher than that of the competing products. < / P > < p > this generation of glass was first used in Samsung’s note 20 ultra, but interestingly, this phone is also covered with factory film. How about the scratch resistance of Samsung note 20 ultra? According to Zack Nelson, an oil pipe blogger, under the Mohs hardness of 6, the screen of Samsung note 20 ultra began to show scratches, and deeper grooves appeared under the hardness of Grade 7. Even so, Zack Nelson thinks the phone is quite durable, probably because it’s “peer-to-peer.”. < / P > < p > here we need to mention what is Mohs hardness. It is a standard of mineral hardness, also known as Mohs hardness. In short, objects with low Mohs hardness will be scratched by objects with high Mohs hardness. < / P > < p > the Mohs hardness of the glass on the surface of the mobile phone screen is generally about 5.5. Like nails, keys, iron, etc., Mohs hardness is not as high as glass, so don’t worry about scratching glass. < / P > < p > what makes your screen wrinkle is the least noticeable dust, sand and stone. Because dust and sand contain quartz, which has a Mohs hardness of 7, there is no doubt that it will be scratched. < / P > < p > I need to remind you not to stack two iPhones together, especially without film. Because the iPhone uses sapphire lenses, Mohs hardness of 9, it is easy to scratch the iPhone screen, the following is the lesson of tears. < / P > < p > the logic is very simple. Only when the mobile phone uses glass with enough Mohs hardness, can we “run naked” without worrying about scratching. But this day, I don’t know when it will come. < / P > < p > in addition to the fact that the glass is scratched, the scratches we sometimes see may be caused by the coating on the glass being scraped off. After all, today’s mobile phone screens are coated with materials such as fingerprint proof and oil repellent. If this coating is scraped, it may also produce marks like glass scratches. < / P > < p > therefore, from the perspective of manufacturers, it is a win-win thing for users and enterprises to spend a small cost to prevent screen scratch. After all, as the mobile phone screen is getting better and better, it is also more and more expensive. It is difficult for ordinary consumers to bear the cost of screen replacement. < / P > < p > in the survey of Evans, only about 16% of the people said that they did not apply the film. As far as I’m concerned, since the iPhone 7 plus, I’ve stopped putting film on my phone. Of course, screen scratches and oil layer peeling off are inevitable problems, but I am not willing to sacrifice the feel and feel in exchange for the “perfection” of the screen surface. < / P > < p > among the people who put on the film, most of them pursue the sense of security and are afraid of scratching or bumping on the screen. Some people said, “although I know that without film, there will be no accident on the screen, but I just want to put it on, to make a sense of security. “Some people said frankly,” even though they know that mobile phone stickers are a form of anxiety about selling, they still can’t help pasting them. “. < / P > < p > some people want to ensure that the screen is “perfect” so that it is convenient to use it. After all, the speed of updating and iteration of mobile phones is faster and faster. Some friends who like to “taste fresh” like to hang salted fish “back to blood” on their old mobile phones after the release of new phones. A brand-new screen is easier to sell, and the price can be firmer. < / P > < p > there are still a small number of people who are affected by their habits. “Since I bought the first smart phone, I started to paste the film. It has become a habit. If you don’t let me post it, I will feel that the mobile phone is incomplete.”. Some said. < / P > < p > of course, there are friends because they like the various functions of the mobile phone membrane. “I have to take the subway when I go to and from work. Several times before, when I was playing with my mobile phone, the people next to me were staring at me. Later, I simply bought an anti camera film. A friend said to Ivan. < / P > < p > in addition to some special functions, many friends are running to the hydrophobic layer on the film. After all, the hydrophobic layer on the membrane is lost. It is convenient to replace it with a new one, and the cost is not high. But if the drainage layer on the screen falls off, it will be very troublesome to make up again. According to the results of the survey, more than 80% of the users are “film sticking party”, which makes the reason for the existence of factory films one more point. Manufacturers can please most users at a small cost. Why not? On the other hand, the mobile phone film industry has also created considerable jobs in recent years. Film companies have made a lot of money by relying on the “fragile” mobile phone screen. A friend who likes conspiracy theory said to me, “these people may be the biggest obstacle in the way of screen glass going strong.”. 865 optimization is different? These mobile phones should teach you a lesson!