Crossing the hill, I found no one waiting.

Use this lyrics to describe the recent two generations of the Find X and X2 series, which are quite relevant. The former uses the form of a positive and negative non-porous plus perimeter lifting structure to tell the industry what a natural phone looks like. In terms of structural design, there is no ancient one; the latter took out a (3K) QHD + 120Hz classmate-compatible top screen and stepped into the “no man’s land” of the screen display field. There are mobile phones with higher screen resolutions than the Find X2 series, and some have high refresh rates, but there is only one of both the high-definition resolution and 120Hz refresh rate.

Under the article “The screen of a domestic flagship mobile phone is finally going to catch up with Samsung Apple”, many readers have a classic reply: After all, is it not a Samsung screen?

Of course, now that smart phone products have passed the wild age of assembling materials, cottage machines have almost disappeared, and domestic flagship mobile phones are almost alive, otherwise they would not dare to release them. Therefore, the Find X2 series of screens received DisplayMate’s highest A + rating. The first half of the military medals belongs to Samsung Display. The other half must be OPPO itself.

Behind the scenes of OPPO Find X2 screen

What is DisplayMate A + rating screen?

Once we watched the press conference, when we saw the screen, it was basically how high the resolution and how big the size was. Later, we will mention parameters such as brightness and contrast.

Different from the parameters of the conference, DisplayMate does screen rating with dozens of dimensions, and the resolution size is not enough. After all, DisplayMate only has a rating that measures the overall quality. There is no annual largest mobile phone and List of the highest PPI phones of the year.

The highest A + rating of DisplayMate for Find X2 series screens actually means This screen needs all-round and no shortcomings . An example is that DisplayMate gave this screen the highest 12 sub-items. Evaluation.

If DisplayMate’s evaluation system is somewhat professional for the mass consumer, then the column parameters are further intuitive.

31The resolution of 68 × 1440 and 513 PPI means that the users still cannot see the existence of pixels at extremely close distances. 800nits global peak brightness + 1200nits local peak brightness can allow users to continue to be exposed to the sun in summer See the screen clearly, and the HDR10 + with brightness support can make the dim HDR video on many mediocre screens bright and vivid.

In the recent stage, I believe that you have seen a lot of popular science about high-refresh rate screens. Even a high-end machine screen without high refresh rate can be said to be short board. In short, the 120Hz screen refresh rate and 240Hz touch sampling rate allow the operation to follow the hand and visual fluency.

One billion colors, 100% P3 color gamut, and the industry’s highest standard JNCD≈0.4 color standard, no longer make people wonder “what black is black, what white is the white in front of you …”

Really just buy the screen and install it?

A piece of A5 grade beef is made for top Japanese chefs, and it will melt into the mouth. If you make it for yourself, it is estimated that even the vacuum-packed beef of three squirrels can’t match.

To a certain extent, top-level components are equivalent to top-grade ingredients. Whether they can have a top-level experience depends on the skills of engineers and chefs. If there is too much analogy between Wagyu, then Sony, which led the smartphone industry last year,The IMX586 image sensor can better explain the problem. Some mobile phone manufacturers can rely on this sensor to make a good imaging experience, and manufacturers with less optimization experience can only make a moderate level.

The screen area is even more so.

Whether it is the 12 highest quality of Find X2 series screens mentioned by DisplayMate, or the industry’s highest JNCD≈0.4 color standard, and ultra high definition resolution plus 120Hz refresh rate, both are unique in the industry. It can explain that entering the “no man’s land” depends on cars and people.

For OPPO, this is the first time they have adopted a 120Hz refresh rate OLED screen. The first requirement before engineers is to match the high refresh rate drive scheme. To this end, they chose a driver IC with faster pixel driving capability on the hardware, and in order to enhance anti-interference ability, they adopted an 8-layer circuit board design. They even worked with Samsung and UMC fabs to analyze and optimize the process.

The matching requirements on hardware don’t stop there. The Find X2 series is the first mobile phone based on Y-OCTA in China to achieve a maximum sampling rate of 240Hz. Not only does it support ultra-high sampling rates, but the Y-OCTA panel can also make the phone thinner and lighter. .

Higher resolution and higher screen refresh rate can bring a better visual experience, but it also brings a burden on battery life. Here you need software to optimize. In the screen settings, the Find X2 series provides There are three modes of 120Hz, 60Hz and intelligent switching. Intelligent mode adjusts the frame rate in real time for different applications and scenarios. For example, some applications only support 60Hz refresh, the system adjusts the refresh rate to 60Hz synchronously. Second, the system will detect different layer refresh requirements to adjust the refresh rate. In the still picture, 60Hz and 120HThe refresh effect of z is the same. Through the touch frame-raising technology, only when the screen is swiped, the frame is raised to 120Hz to ensure smooth and ensure battery life.

The touch sampling is similar. Find X2 introduces a time-sampling sampling scheme to reduce the interference between the display layer and the touch layer. When the output signal is displayed, the touch layer does not perform the sampling operation. , Touch layer resampling.

Mobile phone running points can be put in the refrigerator. DxO camera evaluation can be the same as the special version firmware. In fact, the testing equipment selected for DisplayMate can also find the most accurate quality. This is because it is subject to the production process of the screen. There may also be various differences in the screen display between the same phone, such as some bluish and reddish.

Although we often say that mobile phones are the iconic products of industrialization, standardization and scale, the inconsistent quality of the screens is one of the few outstanding problems in this industry. In fact, this problem is not unsolvable, but it takes more time and cost.

The screen of each Find X2 series mobile phone that leaves the factory now is in the soft mode and cinema mode. The color standard is JNCD≈0.4, △ E≈0.4, 2.2 of the Gamma standard, not just the few mobile phones that have been tested. This color accuracy. This means that OPPO needs to add a screen calibration link to the production line, and they have also applied for two screen calibration patents. The calibration link includes collecting raw screen data,Generate a calibration file and finally update it to the display processing module of the phone.

If you take a closer look, many Android phones ’automatic brightness adjustment is a bit of a dead name. Many times, when we go from indoor to outdoor, we will see that the phone changes from extremely dark to extremely bright, like spinning The radio volume key wasn’t sure enough, and suddenly changed from the lowest volume to the deafening volume.

At the same time, for self-luminous screens, it is also necessary to change the color temperature according to the ambient light to ensure a good and natural reading experience similar to a paper book.

This is a detail problem, but it is also a pain point for users. It stands to reason that smooth automatic brightness adjustment and ambient color adaptation are not so worthy of a large book, after all, this does not affect the beauty of the parameters.

▲ The red dot is the color sensor

In order to solve this pain point, OPPO has shared two six-channel color sensors. The sensors can accurately obtain the light intensity and color temperature of the surrounding ambient light, adapt the ambient color temperature, and intelligently adjust the brightness. For a full-screen mobile phone, how to put a sensitive color sensor on the front is a problem. Find X2 uses a flexible light guide for the first time to hide the front color sensor in a very narrow gap. It can be said that it is the best of both worlds. And, these screens are smartAll algorithms and strategies for adjustment are self-developed by OPPO.

As a terminal manufacturer, there are actually many similar tasks. For example, if you want to get 1 billion colors of display effects, you have to pull Qualcomm and Samsung together for commissioning. ColorOS is also suitable for high-refresh screens. More interactive details must be added, and the design is more in line with the dynamics of natural mechanics.

In addition to adapting high-performance screen driver ICs, redesigning the circuit board, and ensuring the balance between high-refreshment screen experience and battery life through software algorithms, new screen verification links were added to the production line, and color sensors were redesigned. Allows users to experience high frame rate experience like system animation when watching 24 or 30 frames of video. The unique hardware “O1 Super Sense Quality Engine” is also added to the Find X2 series, which can achieve Video Dynamic Frame Insertion Technology (Motion Clear). The principle of this technique is to estimate the motion trajectory of each frame of the picture, make intelligent predictions based on the relationship between the front and back pictures, calculate the movement elements in the picture in this process, and then generate an image picture and insert it into the original frame between.

The foundation of these screen hardware and software not only affects the look and feel of the system during operation, but also the accuracy of the colors when taking and viewing pictures. It also affects the ecological level. For example, in Tencent Video and OPPO, they cooperated with high frame rate content resources-Tencent Video VIP Zhencai AudiovisualArea. Find X2 users will enjoy the audio and video combination of HDR10 + high frame rate + surround sound first.

The game level is similar. The perfect world “Forsaken World” and “Xiao Xiao Ao Jiang Hu” mobile game 120fps mode will also be turned on for Find X2 series users.

Creating the “no man’s land” is the romance of engineers

OPPO introduced such a story to Ai Fan’er:

OPPO has a PhD in color science that has studied in Japan. As we all know, in the Japanese consumer electronics industry, television is a traditional advantage project. The PhD in color science also mostly chooses to go to traditional TV manufacturers. Entering the technology development of mobile phone screens, this doctor with a paranoid attitude towards color wants to achieve a breakthrough in mobile phone screen technology at OPPO.

However, color is a subjective metaphysical problem and an objective scientific problem. In order to balance and optimize the parameters and subjective feelings, he can be said to be a prosperous night, and finally realized 1 billion colors on the mobile phone screen. .

Similar stories of engineers rushing into the “no man’s land” technology are not uncommon at OPPO. For example, Zhang Jialiang, known as the “Father of VOOC Flash Charge,” also said in an interview with Ai Fan’er:

Why (VOOC Flash Charge Technology) is OPPO’s. First, OPPO is consumer demand-oriented, which is certainly beyond doubt. Secondly, in the matter of charging, we started earlier, stepped on it more accurately, steadily and ruthlessly, when everyone returned to God, OPPO has come to the front. It does not mean that others did not see its value at first. Sometimes it is not just a matter of ability. It may be a matter of ability at all, but because of appeals, ideas, or values.

I dare not say that our abilities are better than anyone else. I can only say that we work harder than anyone else.

In fact, in the highly mature smart phone industry, there are not so many genius stories, but rather an exploratory story composed of countless trial and error.

To make a top-level screen is not as difficult as exploring the new route of Everest or Antarctica. The key is to pay and cost.

The fact that “just buy the screen and install it” is eliminated, the fact that the screen of the Find X2 series is actually a project across China, Japan, South Korea, and Vietnam: the core software and hardware R & D teams are in Shenzhen and Dongguan, Samsung Display ’s factories and research Based in Korea, screen module production is in Vietnam, partner companies and consultants are in Japan …

The large geographical span and time and money costs are also complementary. In order to maintain the same color standard for all screens, the new color correction equipment is worth millions. The new process allowsThe cost of each production line will also increase by two to three million, and the production time of each mobile phone will increase by 26 seconds.

This is what the doctor of color science called “the romance of engineers”: looking for the best partners in the industry chain, and the most outstanding companion, Pingxing Daiyue, for both the “best” soft and hard. Again, whoever puts more effort into it, whoever explores farther, will reach the “no man’s land” of technology one step ahead.