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What sacrifices have we made for the so-called true screen of mobile phones?

via:博客园     time:2018/7/5 19:51:15     readed:256


A variety of full screen phones

Since the advent of Xiaomi MIX, the major mobile phone manufacturers are moving forward in pursuit of a comprehensive screen. First of all, the most representative iPhone X led heterosexual comprehensive screen (Liu Haiping), a large number of manufacturers in the country to quickly follow the program; the other is such as OPPO, vivo, neither the Liu Hai, nor the thick chin, the screen accounts for more than 93% of the so-called real full screen. So what are the technological innovations of the major manufacturers for the full screen? Are these changes for consumers to experience promotion or compromise?

Get rid of the chin and spare no effort

Domestic manufacturers are crazy about the wide Liu Haiping X of the standard iPhone, but rarely have the thickness of the chin compared to the iPhone X, because iPhone X uses a COP Technology (Chip On Plastic). This is a perfect package for the flexible OLED screen.

Before we understand COP technology, we need to understand the technologies adopted by other manufacturers: COG and COF:

Into 18:9

The problem is that the glass can't be folded and curled, plus the wiring attached to it, which is destined to require a wider one.


The encapsulation difference between COG and COF

A more intuitive statement is that the IC chip is embedded on the FPC soft board, that is to say, it is attached to the cable between the screen and the PCB hard plate.This technology is Samsung S9 series products, as well as the previous generation of S8 series and NOTE 8.

Finally, the cop technology used in the iPhone X: simply put, the backplane of a flexible OLED screen is not LCD-specific glass. It uses a similar material to the FPC soft plate and is flexible enough to be curled at will. Therefore, the COF-encapsulated screen can be directly back on the COF with a 90% discount on the back, thereby minimizing screen module pairs.


The difference between COG COF COP

Although cop encapsulation technology can compress screen modules to the maximum extent, the higher the compression ratio, the higher the cost and the lower the yield.

To sum up, at 18:9,

Here, the major manufacturers finally removed the phone's chin, but this also brought a new problem: for the sake of

For those who prefer prefix fingerprint recognition, their hearts must refuse. Because they are used to the mobile phone on the desktop, do not have to hold up, the thumb is unlocked one press, then on the back of the mobile phone on the back of the fingerprint, it seems not beautiful enough?

At this time, apple thought of face recognition technology based on 3D structured light.

No chin, what do you do with fingerprint identification?

3D structured light is a technical term. The traditional RGB camera gathers the effects of ambient, natural and solar light to form 2D images. In contrast, 3D structured light can achieve high accuracy depth information acquisition, rapid scanning, calculation of object's position and depth according to the change of object's light signal, and then restore the whole three-bit space. The iPhone X is slightly conservative. Though he cut his chin short, he could not move his forehead, and there remained a wide one


OPPO Find X and iPhone X

OPPO find X is more

The face recognition realized by 3D structure optical technology has no problem in security, but it also has some defects: first, there is a certain requirement for the exposure rate of the face. It is impossible to recognize when wearing a mask or the side face lying on the bed. In addition, although the recognition speed of the OPPO Find X is very fast, it can go through the experiment. All kinds of tests of the room, but after all, are mechanical structures. There will inevitably be some unexpected scenes. There are still some hidden dangers.

And the other manufacturer, in vivo,


Fingerprint identification under NEX S screen

The current fingerprint identification scheme is based on the OLED screen: the fingerprint recognition module that receives the reflected light is placed under the OLED screen, illuminated by the light of the pixel point of the screen, and reflected to the fingerprint identification module, and then the user fingerprint is identified.

In the actual experience, although the recognition speed of NEX S has been improved substantially compared to the previous generation of vivo X21, there is still a certain gap compared with the capacitive fingerprint identification, and the recognition effect will be greatly reduced if the finger is contaminated with water.

In addition, the most important thing is that there is no physical key, the user wants to unlock the lock, remember the area that can be unlocked, ensure that every time is accurate, which is obviously not as convenient as an entity button.

Of course, the iPhone X is hard to be perceived by the average consumer in an effort to get rid of the jaw.

The receiver is an indispensable component in the cell phone. In order to hide the receiver, millet MIX makes a piezoelectric ceramic vibration system: this way is the same as the receiver's sound principle, which is converted into mechanical vibration by electrical signals to produce sound. The difference between the two is only the difference of the vibrating material.


A piezoelectric ceramic receiver for the first generation of millet MIX

Generally speaking, piezoelectric effect is the polarization phenomenon produced by the deformation of certain material in a certain direction by external force. The piezoelectric effect has positive and inverse effects. In simple terms, the positive effect can generate electricity, and the inverse effect can be generated by electricity. By applying the inverse effect to the piezoelectric material, it will deform, and if the alternating current is controlled, we can produce the deformation we need, and the deformation can produce vibration to make sound.

In fact, many materials have piezoelectric effects, but piezoelectric ceramics are relatively inexpensive and stable.

From the above analysis, it is understood that this technology is the replacement of a vibrating film material, originally a small receiver, and now the whole ceramic fuselage or the screen can vibrate to produce sound. But through the ceramic frame vibration voice, on the one hand is poor voice quality, and one point is poor privacy.

On the other side, vivo NEX S vibrate through the micro vibration unit to drive the screen, and the sound quality is still acceptable. At the same time, it also puts the light sensor and the distance sensor under the screen, and combines the algorithm to realize the extinguishment of the screen when talking. As for the front camera, a lifting periscope structure is made.



OPPO find X makes a small opening at the top of the dual-track periscope structure, which corresponds to its real receiver.

It can be seen that in order to remove the bangs on this comprehensive screen, manufacturers are also struggling.


In order to complete the screen, the manufacturer narrowed the chin, sacrificed the traditional fingerprint identification, brought new packaging technology, and face recognition technology, and screen fingerprint recognition technology. Face recognition technology and fingerprint recognition technology have their own advantages and disadvantages in mobile phone unlocking. The key is habit.

While the screen fingerprint identification technology does not change the user's usage habits, but there is a certain distance from the common fingerprint identification technology, which is specifically shown on the speed of recognition.



Samsung S9 ,iPhone X,OPPO Find X,vivo NEX S

In addition, the mechanical structure will also cause the increase of the weight and thickness of the mobile phone, the space of the camera, so that the mobile phone can not install the larger camera module; most importantly, the mobile phone with the lifting mechanism can not do the three defense functions.

Then the problem is coming. At this stage, in order to get a real comprehensive screen, the manufacturer needs to spare no effort to innovate the design and try to improve the technology, but some of the existing practical functions need to be compromised in the experience, such as the fingerprinting technology, the mechanical lifting structure.

So for users, now is the choice for a total of more than 93% full screen, but to make compromise on other experiences, or to accept a full screen with a bangs and a lower screen. I believe every user has his own reasonable choice.

In order to pursue the real full-scale screen, manufacturers have made technological progress, such as new packaging technology, off-screen fingerprint identification technology, which we all need to be sure; however, the mechanical lifting structure in my opinion, But there is no better plan for the moment. Perhaps it will exist for a certain period of time, just like the Liu Hai screen, but when the technology develops further, there will certainly be more advanced technologies in the future, giving users a piece of the technology that does not sacrifice any experience.

This article is the first titanium media, author / Tang Zhi Xiao, editor / Xiang Ou.

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