Why does the iPhone 12 have a green screen?

This year's iPhone seems to be a bit hard to get along with "color". A few days ago, the new blue ugliness that was added to the iPhone 12 series was complained on the whole network, and it was even compared with the blue of cheap daily necessities such as trash cans, toilet brushes, and underwear, making the always exquisite and high-end iPhone lose face.

However, playing the stalk belongs to the stalking game. After touching the real phone, users quickly get used to this blue. After all, the picture and the real phone still have a color difference, and the craftsmanship can greatly affect the texture, and a wave of spoofs has passed Then it died down.

▲ iPhone 12 and iPhone 12 Pro. Pictures from: MacRumors

But I didn't expect that just a few days after it stopped, the iPhone 12 would be associated with "green" again. The specific situation is that some iPhone 12 series machines will show irregular green when displaying gray screens at low brightness.

If you think the new blue is ugly, you can choose not to blue. And the "green screen" is going to be much more serious. Many users point to whether the quality of the iPhone 12's screen quality control is a problem.

Not only "green", but also "green" is different

According to the pictures uploaded by users, the iPhone 12, from the smallest iPhone 12 mini to the largest iPhone 12 Pro Max, may have different levels of low-brightness screens turning green.

So how do you tell if your iPhone 12 is green or not? First of all, we must know that in order for this green screen phenomenon to appear to the greatest extent, two conditions must be met at the same time.

▲ Comparison under the "Shake" interface of WeChat. Picture from: Internet

The first condition is low brightness. Because the red, blue, and green pixels emit stronger at high brightness, the mixed color is still more uniform white, but at low brightness, the color of the screen driving circuit seems to be better at low voltage. It's not so controllable anymore, and many problems can only be exposed under low brightness.

The second condition is to display a dark but not pure black interface or picture. Because the OLED pixels hardly emit light in black, it is necessary to use a non-black interface to detect, especially the dark gray at low brightness.

The easiest way to meet the above two conditions at the same time is to lower the brightness of the phone screen in a low light environment and open the WeChat "Shake" interface at the same time. It will become clear whether there is a green screen problem in this interface.

▲ Picture from: Internet material

Although it is also a "green screen", the iPhone 12 series are still "green".

For example, some people turn green on the entire screen, while some people turn green around the edge of the screen, and some people turn green irregularly.

In addition, the "green screen" affects not just the iPhone 12 model, but all iPhone 12 series have green screens. Among them, the iPhone 12 mini is currently the least "symptom".

In any case, it is clear that this is no longer a case problem, but a large-scale scene.

Software or hardware reasons?

Knowing that "green" is only the first step, we also want to know why this phenomenon occurs.

The abnormal performance of the screen is nothing more than that there may be a problem in two aspects, either a software error or a hardware problem.

What is the "green screen" of iPhone 12? At present, there are many different speculations. According to the Internet, relevant Apple officials said that they have received a large number of reports of this type, and the preliminary judgment is that the software system is a problem.

The possibility of this situation is not small. Because just this year, Samsung’s own flagship model Galaxy S20 Ultra also experienced a "green screen" phenomenon, which is very similar to the iPhone’s performance this time. This is a software bug that was finally solved perfectly after Samsung pushed the new firmware G98xBXU1ATD3 .

Of course, on the other hand, we cannot rule out the possibility of hardware problems, because the current iPhone 12 is basically the same system version, but the green screen appears very random, and the specific symptoms are not regular.

As for the green screen problem itself, OLED screens also have a "previous history". And from the light-emitting mechanism of the OLED screen itself, there is some truth.

We know that LCD screens generally use the RGB sub-pixel arrangement, that is, the number of red, green, and blue pixels is balanced.

But this is generally not the case on OLED screens, because the entire iPhone 12 series uses a sub-pixel diamond arrangement screen, so we will not talk about other sub-pixel arrangements here.

The diamond arrangement uses a diamond-shaped arrangement of sub-pixels. A complete pixel has a ratio of red, blue, and green pixels of 1:1:2, which means that a pixel contains one red sub-pixel, one blue sub-pixel and two green sub-pixels. Pixels.

Although the size of the red and blue sub-pixels is larger than that of the green sub-pixels in terms of size, the number of green pixels is twice that of the red and blue pixels, and at low brightness, green materials usually have higher luminous efficiency, so If quality control is not well grasped, there is a theoretical possibility of a "green screen".

However, the distribution of green pixels on the entire screen is uniform, while the greening of the "green screen" phenomenon is more irregular at all. Can it only be pushed to the head of quality control? For Apple, which has always controlled the supply chain very strictly, such a large-scale problem has not been exposed in the three years from the beginning of the iPhone X to the iPhone 11 series last year, and the possibility of hardware problems is not too great.

▲PHOTOGRAPH BY ARTUR DEBAT. Picture from: FORTUNE

For users who have already bought a "green screen" iPhone, they are definitely more entangled. On the one hand, this problem does not always affect it. Perhaps it will only be noticed when lying in the bed at night before going to bed and playing with the phone.

Another part of the users may be entangled in the time cost and other issues, do not know whether to wait for the system upgrade and repair or return to the store. And some users also reacted, the store staff said that everything was normal in the quality inspection, and they could not be exchanged.

My suggestion is that if you are really upset about this matter, you should try to solve this matter as soon as possible. You can try it whether you are going to the Apple store to try to exchange the product or directly return the product, even if it is returned. It's easier to buy when the time is right than to wait.

As the current outbreak of problems is relatively concentrated, I believe that Apple should provide the results and solutions soon, but from the personal standpoint of consumers, it is best not to wait.

Resolve early and relax early.

It’s not the first day of "green"

In fact, this time the iPhone "Green Screen Door" is not the biggest noise. You must also remember that there were some screen "rollovers" in the OnePlus 8 Pro before. Moving forward, a similar "green screen door" also occurred when Huawei Mate 20 Pro was launched in November 2018.

▲ Mate20 Pro "Green Screen Door". Picture from: YouTube account "Watch"

The situation at that time was that the Mate20 Pro with LGD screen had a "green screen" phenomenon, while the screen with BOE basically did not appear.

At that time, it was also the first time that public users raised strong doubts about the mixed use of screens, even though it is the most common hedging strategy in supply chain management that a component has a supplier. But after all, this kind of problem caused harm to individual consumers.

As for the reason, some insiders quoted the explanation given by Samsung OLED experts as:

When the OLED display is produced, the laser carving project's differentiation of the MOSFET processing leads to color cast, which is a production quality problem and causes the screen to display color cast.

In the end, the after-sales strategy given by Huawei's official customer service is that within 7 days from the date of receipt of the mobile phone, if it is detected at the Huawei official authorized customer service center that there is a green screen phenomenon, it can be returned. If it exceeds 7 days, it can also be replaced with a new machine for free.

▲ The edge of the curved screen turns green. The picture comes from: Tieba user @ 五北人

In addition, a kind of "green screen" that is often mentioned is that the edge of the curved surface is green. This problem is relatively simple. The curved surface causes an inclination angle, which makes the OLED appear color cast at a large angle. And some suppliers have made targeted optimizations, and some have not, so there is a phenomenon that the edge of the curved surface has different green colors.

If appearance and color determine our first impression of mobile phones, then the screen determines our second impression of mobile phones. In actual use, we always can't get around the screen as a carrier, which carries almost all interactions and most of our life demands, and all information is transmitted from this screen.

▲ The iPhone X was also criticized for its Pentile arrangement when it was first replaced with OLED. Image from: iDownloadBlog

Therefore, screen problems are also the most common problem, ranging from light leakage, Yin Yang screen, and yellowing in the LCD era to today's digging errors, color cast, and green. In fact, if you search for it, you can find that the screen problem has never stopped. But such a large-scale problem is indeed relatively rare, and it also makes Apple very passive.

I prefer this to be a software bug rather than a hardware problem, so I know that waiting for the system upgrade, everyone's green screen phenomenon can be solved. But the final result of the investigation will probably take some time.

If you are not sure whether your iPhone has a "green screen" phenomenon, you might as well turn off the light now, turn down the screen brightness, and open WeChat and shake it.

How is the result?

#Welcome to follow Aifaner's official WeChat account: Aifaner (WeChat ID: ifanr), more exciting content will be provided to you as soon as possible.

Ai Faner | Original link · View comments · Sina Weibo