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Do we really need mobile phones with 144hz or even 240Hz screens?

via:博客园     time:2020/1/19 9:31:34     readed:1353

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2020 is the first year for mobile phones to enter the era of high refresh rate. Since the middle of last year, the market has gradually recognized the significance of high refresh rate for mobile phones. In the trend of high frame rate, many manufacturers have launched mobile phones with 90hz OLED screen. At the beginning of this year, LCD screen with 120 Hz refresh rate appeared in the supply chain, which means that the high refresh rate has entered the market of thousand yuan machine. Two days ago, Yijia also announced the completion of the research and development of 120Hz OLED screen, while Nubia announced that it would launch 144hz screen mobile phones.

In less than a year, the refresh rate of the mobile screen has more than doubled, which will change our experience. Most intuitively, it may be that the mobile phone's fluency has increased significantly.


What can high frame rate mobile phones bring

Compared with the ordinary 60 Hz screen, 90 Hz or higher screen refresh rate can make the screen display more pictures in unit time, thus reducing the pause time between two frames of animation. Due to the decrease of pause time and the increase of animation transition frame, we will obviously feel that the screen with refresh rate of 90hz and above is smoother.

For ordinary users, the most typical scene is the sliding switch page. Whether it is up and down sliding or application scaling, high frame rate will have a significant impact on the animation effect, no matter what. As long as you compare 60Hz and 90hz mobile phones, you can see the obvious difference. In particular, the effect is more obvious when using microblog and other information streams.

Sharp's 120Hz screen image from: sharp

In addition to the obvious bonus to the fluency of ordinary applications, high frame rate is often closely related to E-sports. In the era of PC games, players know the importance of high refresh rate screen to the game. No matter how good the graphics card is, no matter how high the frame number is, it is not necessary to turn on "vertical synchronization" under the 60Hz screen, so as to stabilize the frame rate at 60 frames. Otherwise, under the low refresh rate of the screen, the picture will be torn.

When the frame number of low refresh rate display is too high, the picture will be torn. Vertical synchronization must be enabled

At the beginning of the development of smart phones, the screen refresh rate will not become a "stumbling block" for the game screen, because the performance of mobile phones at that time could not run over 60 frames of games, but now the performance of mobile phones is enough to support many games running over 60 frames, and the application of high refresh rate screens in games has full soil.

If the game adapts to the screen with high refresh rate, you can start the FPS game on the mobile phone step by step. A powerful screen with high refresh rate can even slightly affect the balance of mobile games. For people who often play competitive mobile games, the high refresh rate of mobile screen is really very important, even called "just need".

The high refresh rate screen can not only affect the daily use and games, but also affect the viewing effect on the mobile phone. You might think, isn't there only 30 and 60 frames of common online video? Before the application of the MEMC chip, the high refresh screen really can not improve the smoothness of viewing, but with the MEMC chip that can insert frames, the video can be inserted into the frame rate that conforms to the screen refresh rate, and the video smoothness can also be improved under the support of the high frame screen.


Who is important for high frame rate and screen quality?

Obviously, "there is no free lunch.". The most direct problem of high refresh screen is the sharp increase of screen power consumption. Although this problem can be optimized by the system, it cannot change the fact that high refresh screen will increase power consumption. This problem has been fully exposed on the screen of sharp aquos 120Hz released a long time ago. When the 90hz plus 7 Pro and the 120Hz refresh rate Rog game phone 2 turn on the high frame rate mode, the power consumption will also increase.

Foreign media do a continuous comparison, can be seen 90 Hz impact on a plus

For manufacturers, the only way to alleviate the power consumption problem is to increase the battery capacity, or let the screen run in different scenarios at different refresh rates. However, no matter how to optimize, it is bound to make trade-offs in other aspects, such as the impact of battery size on the thickness of the fuselage and other issues, which may only be solved by the breakthrough of battery technology again.

In addition to the problem of endurance, in some cost-effective mobile phones, the high refresh rate screen may sacrifice the quality of the screen to some extent.

It should be emphasized that it is not that high refresh rate will affect the quality of the screen, and the refresh rate itself is not necessarily related to the quality of the screen. Many manufacturers will improve the rate of screen refresh at the same time to ensure that the screen flagship class screen quality.

But in the low-end models that value cost performance, because of the cost problem, they often need to choose between screen quality and refresh rate, such as the LCD 120Hz screen launched by some manufacturers before.

We know that the LCD screen response time is significantly higher than OLED screen due to the LCD flip problem. This problem not only exists in the 60Hz screen, even if the screen refresh rate is increased to 120Hz, the drag problem will still reduce the fluency brought by the high refresh rate. In terms of actual appearance, the fluency of high refresh rate of LCD screen is weaker than that of OLED screen.

In addition to the problem of drag shadow, LCD screen also lags behind OLED in contrast, gamut range, default color temperature and color accuracy. Let alone some low-end high refresh rate LCD's screen quality has shrunk. The free 120Hz high refresh rate, but the screen quality has returned to the level of thousand yuan machine a year ago, which can be said to be picking up sesame seeds and losing watermelon.

120Hz LCD screen color gamut

For most ordinary users, such a trade-off is not worth it. After all, most users don't use their mobile phones well when they don't see high frame screens? If there is no comparison, in fact, most people do not have a big concept of high refresh rate. Different from high refresh, a screen with outstanding color and brightness can improve daily use more obviously.

Screen default color temperature reached 9400K a high-quality screen equivalent to the "furniture" in the room, have and do not have the experience is completely two different things, is rigid demand. The high rate of refresh is the "art deco" in the room, which allows the screen experience to rise to the next level when the basic needs are met.

At present, most of the 1000 yuan high frame screens are more or less in this situation of "picking sesame seeds and throwing watermelon". After all, the cost is there, and no one wants to make a loss business.

At present, most applications and games on the market have very limited support for high frame rate, most of them are still in the era of 90hz, and even a considerable part of them are still at the level of 60 frames. In such a large environment, the radical improvement of screen refresh rate has not greatly improved the user experience. On the contrary, it will cause problems such as reduced endurance.

Even if the endurance can be sustained, it is difficult for mobile SOC to make these large-scale games run stably for a long time at 144 frames or more. For example, the Heping elite with significantly improved high frame rate experience, the snapdragon 855 plus can still support the mobile phone running in 90 frames per second environment. At 120 frames per second, the snapdragon 855 plus is running out of performance. If the 144hz screen is used, SOC performance will encounter greater challenges. If you want the frame rate to run steadily, I'm afraid the minimum image quality will not run.

QQ flying at 120Hz has been supported

And we need to know that although the human eye has no limit to refresh rate, the perception of refresh rate is gradually decreasing. People can easily perceive the difference between 60Hz and 120Hz screens, but there is no such obvious difference between 240Hz and 120Hz screens.


Written in the end

High refresh rate screen is indeed the future of mobile phones. Under the leadership of the industry leader and the maturity of supply chain technology, the 90hz / 120Hz screen will soon be popular on the market. But only high frame rate is meaningless. To evaluate the quality of a screen, it is necessary to look at the effect of the screen itself.

Before the supply chain technology is fully mature, the cheap high frame screen on the thousand yuan machine may not allow users to get a good experience. Before buying this kind of mobile phone, as a rational consumer, it's better to first look at the real phone, and make the right choice between color and refresh rate.

When choosing the flagship mobile phones with 120Hz OLED screen, although we don't need to worry about their screen quality, we still need to consider whether the endurance can meet the use demand, and make preparations for the charging treasure.

As to whether the 144-Hz screen, or even the 240-Hz (Sharp AQUOS Zero2) screen, now released or soon to be released, is worth choosing, it's time to think about which experiences and parameters are more important.

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