"Buying a mobile phone is buying a screen, and having a good screen is naturally a good mobile phone" Has long become the standard thinking of people when buying a machine. It is true that the "screen" is an extremely important component of today's smart phones, as the most frequent and even the only channel for human-computer interaction, the quality of the mobile phone screen will directly affect the consumer's first impression of this product, and even the performance, hardware configuration and experience of the subsequent mobile phone must be displayed through the "screen". Especially now in the flagship machine higher and higher demand for the game, with the improvement of player operation, the parameters and experience of the screen is more demanding, because the quality of the screen, related to whether the player can play a wonderful and delicate operation in the game, and these operations, in turn, will be related to the victory or defeat of the game, and even can turn the tide of battle, anti-defeat into victory.
Mention the "screen representative" of the mobile phone industry, whether you always pay attention to the trend of the industry or not, you must be able to think of this brand for the first time, that is, "OnePlus". As the leader of the high-frame screen in the mobile phone industry, OnePlus has successfully broken through in the field of flagship machines with the unforgettable "2K+90Hz" high brush screen on the OnePlus 7 Pro. Since then, OnePlus has continued to exert its strength on the screen of the annual flagship every year, and "a good screen" has also become one of the most eye-catching labels of OnePlus mobile phones. On last year's OnePlus 9 Pro, OnePlus took the lead in popularizing the 1Hz-120Hz LTPO free high frame screen, and this year's OnePlus 10 Pro continued to polish the "LTPO" technology, "the industry-leading generation ltpo 2.0" is a big surprise for the opening screen of the one plus 10 Pro to consumers.
It's more than just "shifting"
Since the First Plus 7 Pro took the lead in carrying the "2K+90Hz" high brush screen, the "once difficult to return" experience directly left the flagship machine of the same period behind, consumers and the entire industry have been impressed by the unprecedented smoothness and silkiness from the "physical level", and have begun to keep up with the trend of high brushing. But the problem of "high brush" has also been exposed at this moment - once the tuning is not good, then the battery life and mobile phone power consumption will usher in great challenges. In order to overcome the battery life problem caused by high brush screen, "LTPO" technology came into being.
OnePlus 7 Pro
So what is "LTPO" technology? First of all, we understand a big premise: "The birth of LTPO is to save power and extend the battery life of mobile phones." Under this premise, it becomes very simple for us to understand the principle of "LTPO". First of all, LTPO is a TFT backplane technology that acts on OLED screens. But at this time, there must be a small partner who will question: "TFT is a variant of LCD, LCD and OLED work completely differently, how should the two be combined in technology?" ”
To put it simply, the working principle of LCD is that it has a completely independent backlight layer, as we all know, the LCD screen itself can not emit light, so its luminous and color rendering is divided into two parts, to control the LCD pixels normal operation, we need to use additional circuit drive. But OLED is completely different, OLED thanks to the characteristics of "self-illumination", the luminescent material can be lit after reaching a sufficient voltage, and the brightness is determined by the current, so in order to maintain the luminous brightness, the current must be very stable. OK, then if we directly use the LCD driving circuit on the OLED, then it will lead to the capacitor originally used to control the gray level is used to light up the OLED, and the pixel will be black after the power is consumed in an instant, that is, "disposable", the screen is lit, and there is no response after flashing. Therefore, to fuse the two, it is necessary to transform the original "TFT driving circuit principle" so that it can be responsible for opening and closing pixels, but also can control the intensity of light emitting well, and can provide stable current to OLED in one frame.
At present, most of the TFT backplane technology used on the market is LTPS (low temperature polysilicon), its advantages are high resolution, high reaction speed, high brightness, high opening rate, but unfortunately because the electron mobility is relatively large, the leakage current is also relatively large, and the low-frequency drive (that is, the low brightness case) power consumption is also large, not enough power saving. That is to say, LTPS is very expensive, the cost is very high, it is friendly to high refresh rates and can do higher PPI, but it is not suitable for low refresh rates; another technology is "IGZO (Indium Gallium Zinc Oxide)", the electron mobility is relatively not as high as LTPS, so the resolution is inferior to LTPS, compared with LTPS, IZGO is not too expensive, and is naturally suitable for low refresh rates. OK, then the solution to the problem of manufacturing LTPO comes: LTPS has high mobility without low leakage, IGZO low leakage but the mobility is not high enough, then we combine it is not good, let LTPS for driving, you can achieve a smaller drive current and lower drive voltage; let IGZO responsible for switching, because small leakage can keep pixels open for a longer time, to achieve a lower refresh rate, this is the origin of the theoretical level LTPO, in fact, LTPO is a combination of LTPS and IGZO TFT backplane technologies, which makes the range of available refresh rates for OLED very wide.
LTPO schematic
The obvious advantage of LTPO technology is the variable refresh rate, the core of the technology is to ensure the premise of high brush fluency, so that the hardware screen refresh rate, accurately match the software content frame rate, reduce the screen repeatedly refresh the same content caused by the waste of power consumption. It is precisely because of this feature that it solves the power consumption problem of the previous "high brush screen", so it has become a popular technology on the flagship machine in the past 2021. With the gradual popularization of LTPO screens, OnePlus, as the benchmark of industry screens, continues to optimize screen technology, and brings us a new LTPO 2.0 technology on one plus 10 Pro. Liu Fengshuo, president of OnePlus' product line, even made a decision on Weibo: "True · LTPO 2.0 is only the interpretation of this plus". So what is the difference between the LTPO 2.0 technology on the OnePlus 10 Pro and the same type of product?
First of all, the LTPO 2.0 solution equipped with one plus 10 Pro is completely based on the in-depth self-research of one plus on the full link of software and hardware, which gets rid of the limitations of the screen's own frequency conversion mode, and does not rely on the adaptation of third-party APP, and can be flexibly adapted in all scenarios. Models on the market usually use conventional "scene recognition" schemes, such as some manufacturers matching fixed refresh rate gears based on scene recognition, while one plus 10 Pro does not have these restrictions and "does not rely on the adaptation of third-party APP".
According to our actual measurements, one plus 10 Pro has different adaptive strategies on different animations on different pages, for example, when we brush the graphics and text of Weibo, the refresh rate will increase to 120Hz, when the sliding stops, the refresh rate will be instantly reduced to 1Hz; if you open a small video in Weibo, then the refresh rate will be fixed at 60Hz, if we are in the typing interface of Weibo, then the refresh rate will be maintained within 10Hz, and the LTPO equipped with OnePlus 10 Pro The 2.0 scheme has a special refresh rate adaptation for each scenario, which avoids the waste of resources in unnecessary scenarios with "high brush rate" and saves power, which has become an inevitable thing.
The frame rate changes as the video plays
The number of frames changes when browsing Weibo
At the same time, in view of the stuttering problem caused by the change in the refresh rate for some sensitive users when using the first generation ltpo screen, the OnePlus 10 Pro directly shortened the delay of the refresh rate change from the conventional 700 milliseconds to 75 milliseconds, and from 1Hz to 120Hz to achieve almost zero latency. It can be said that the OnePlus 10 Pro has the fastest frequency conversion speed in the LTPO panel at present. Combined with the top 2K+ screen jointly developed with Samsung, the native 10-bit color, the peak brightness of 1300 nits, HDR10+ certification, and the 1000Hz extreme touch sampling rate that can be triggered after opening the "O-Sync overclocking response", the screen of the OnePlus 10 Pro has once again become the top presence in this year's flagship machine.
Such a good screen only this one plus
Over the years, the brand identity of OnePlus has become different because of the "high brush screen", starting from the first top 2K+90Hz screen in the industry of OnePlus 7 Pro, to the 2K+120Hz pupil screen on the OnePlus 8 Pro to continue to lead, and the 1Hz-120Hz LTPO free high frame screen that OnePlus 9 Pro took the lead in using, after several generations of technological breakthroughs, OnePlus has changed from the leader of the screen to the watchman of the good screen.
Today, the screen on the OnePlus 10 Pro, in today's highly competitive flagship machine market, still do a unique, LTPO 2.0 for each scene of the meticulous optimization, not only makes the experience of one plus 10 Pro more delicate, but also once again conquered today's increasingly demanding consumers, "three points of hardware, seven points of polishing", one plus 10 Pro reproduced the definition of this "ten flagship" on the screen, once again handed over a screen of high score answers.