Cutting edge technology

Guide: There is no doubt that "full screen" is the hottest spot in the smartphone industry in the past two years, and the screen share of the full screen has become a key to the competition of major manufacturers. In 2019, with the further popularization and homogenization of the full screen, the "foldable screen" will become a new focus for smartphone manufacturers.

There is no doubt that "full screen" is the hottest spot in the smart phone industry in the past two years, and the screen share of the full screen has become a key to the competition of major manufacturers. In 2019, with the further popularization and homogenization of the full screen, the "foldable screen" will become a new focus for smartphone manufacturers.

On October 31 last year, Rouyu Technology officially released the world's first foldable flexible screen mobile phone, FlexPai ("Soft"). However, this product seems to me in the opinion of the author, just to grab the first name, the actual experience is not ideal. Previously, when I experienced the prototype, I found that the displayed prototype had degumming at the bend, folding or unfolding the screen, and the UI adaptation was very poor.

On November 8th last year, Samsung also demonstrated its first foldable screen phone (model may be Galaxy F) at the SDC2018 Developer Conference, using Samsung's latest InfinityFlex Display foldable display panel. The main feature is that it can be folded around, and there is also a display screen outside, and Google has developed a system desktop that fits the folding interaction. The latest news shows that Samsung may officially release the phone on February 20, with a target sales of 1 million units.

In addition to Roeyu Technology and Samsung, which have released or displayed foldable screen phones, LG and Huawei have said last year that they will launch foldable screen phones this year. In addition, at the end of last month, Meizu’s patented drawings of foldable screen phones were also exposed. Today, Xiaomi is very surprised to officially showcase its first foldable screen phone through video, and it uses a double fold design.

Xiaomi Shows Foldable Screen New Machine

On January 23, Xiaomi President Lin Bin announced through his personal Weibo: "Under the flexible folding screen technology, four-wheel drive folding shaft technology, After a series of technical problems such as flexible cover technology and MIUI adaptation, we made the first foldingThe screen phone should also be the world's first dual-folder phone. Lin Bin said, "This symmetrical double-folded form perfectly combines the experience of the tablet and mobile phone, which is both practical and beautiful. If you like it, we will consider making a mass production machine in the future. "

At the same time, Lin Bin also released a real-life demo video of a millet foldable screen engineering prototype on Weibo.

From the demo video, this foldable screen phone is The unfolded status screen is close to a square, the size is about 7 inches to 8 inches, and the surrounding border is also very narrow, which can be easily held by one hand.

In the horizontal screen state, the screens on the left and right sides can be Folding backwards, after the folding is completed, the screens on the left and right sides will be closed, leaving only the front screen display. At this time, the display area of ​​the front screen is only about 1/3 of the original, showing the shape of the phone.

[123 From the video Lin Bin's control experience of this mobile phone, the whole control is very smooth, the folding of the screen on both sides is very simple, the UI adaptation is also very fast and natural. Overall, the product is completed. The degree is already very high.

According to the information revealed by Lin Bin, this engineering machine may be named Dual Flex or MIX Flex, and this year it is likely to be put into mass production machine. Before this, Xiaomi should still observe a section. Time.

At present, Samsung has confirmed that it will hold a new product launch conference on February 20th, when it is likely to release its first foldable screen mobile phone Galaxy F. Xiaomi should be launched after Samsung's Galaxy F According to the market feedback on the foldable screen mobile phone,

Where is the difficulty of the foldable screen mobile phone?

As mentioned by Xiaomi Linbin, flexible folding screen technology, four-wheel drive Folding shaft technology, flexible cover technology, and MIUI adaptation are some of the technical challenges of the millet foldable screen phone. Similarly, this is also the difficulty faced by other foldable screen phones.

for folding screens For mobile phones, to achieve a foldable screen, a flexible OLED screen must be used, and it is guaranteed that after thousands of folds, there will be no display problems. This is indeed a difficult point. The screen of the screen phone may be supplied by Samsung. Currently Samsung is on the flexible OLED screen.The technology is the most advanced, and Samsung has the deepest accumulation on the foldable screen. Previously, there was news in the industry that Samsung will offer its collapsible flexible OLED panel, Infinity Flex, to OPPO and Xiaomi after launching its foldable screen device in 2019.

In addition to the foldable screen, the bends of the screen are currently mostly hinged for folding, and a foldable screen phone is commercially available, and the hinges must be sufficiently reliable and durable. It may be necessary to be able to withstand tens of thousands of folds without problems. This is indeed a very big difficulty. Lin Bin said that the Xiaomi foldable screen mobile phone adopts the "four-wheel drive folding shaft technology". Everyone knows the shaft technology, but what is the "four-wheel drive folding shaft"? The author did not find relevant information on the Internet. Obviously this is another term coined by Xiaomi.

In addition, the traditional smart phone has a glass cover on the screen to protect the screen. For the foldable screen phone, the flexible OLED screen also needs a flexible cover, but the glass can not be done. It is foldable, so the glass material can't be used. Only the flexible plastic material can be used as the cover. It also needs to withstand thousands of folds without the test of problems.

Another important point is that flexible OLED screens need to be very firmly fixed on the substrate, but they are allowed to bend, even after thousands of bends. Degumming still needs to maintain its original size and shape. Previously, the Samsung Fixed Foldable Screen Adhesive is a special optical transparent adhesive film (OCA) supplied by Sumitomo Chemical Co., Ltd.

In addition, the UI adaptation of the foldable device is also a big problem, and it is necessary to quickly make an optimal adaptation for different forms of the screen to adapt to the user's interaction needs. This is not difficult for Xiaomi who has excellent UI quick-release experience. It is also the only problem that Xiaomi can solve completely by himself. Other problems need to rely on the supply chain manufacturers to help (of course, Xiaomi integrates it into a complete model, and achieves a higher degree of completion of the product and a good overall experience also requires a certain amount of skill). Similarly, for Samsung, the key aspects of its foldable screen phone are also dependent on other Japanese and Korean suppliers.

According to Korean intellectual propertyAccording to data released by the KIPO, in the past six years, South Korea has applied for 276 patents related to foldable panels and applied for 210 patents in the past three years. According to KIPO, the largest number of Korean application patents is the hinge technology and housing technology (86), followed by the technology of resuming the panel after deployment (50), sensing the user's touch (48) and cover technology when folding ( twenty two). It can be said that these patents cover several key difficulties of the foldable screen.

In contrast, the current domestic mobile phone supply chain related manufacturers in the key technical areas of the foldable screen patent layout and technical reserves are insufficient. Therefore, in the future, domestic mobile phone manufacturers should pay special attention to avoid some "pits" and patent traps when launching foldable screen phones.

Editor: Rang Kejian

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