Familiarity with the concept and effect of a higher refresh rate for smartphone screens


Familiarity with the concept and effect of a higher refresh rate for smartphone screens

Familiarity with the concept and effect of a higher refresh rate for smartphone screens

New news unit EMGblog.com: New technologies emerge in the world of mobile devices every year. come and become a factor to attract users and competition among producers. The phenomena of 2019 were things like 3- and 4-cameras, fingerprint sensor under the screen and embedding a selfie camera in the form of a hole inside the screen. Approaching the end of the first quarter of 2020, we can say that one of the most important phenomena of this year will be screens with a refresh rate of 90 and 120 Hz. After this type of display screen was used in a few smartphones last year, this year we see most manufacturers turning to this technology in different models.

What is the image refresh rate?

To understand the concept of refresh rate and the advantage of 90Hz and 120Hz screens over normal 60Hz screens, it is necessary to have a general understanding of how screens work. Ignoring the technical and complex details of the screen’s operation, it can be said that in simple terms, a screen works by successively depicting a series of images or so-called frames. In fact, in order to trick the human brain and create the illusion that an image with moving parts is in front of our eyes, the screen must display a certain number of these frames consecutively every second. If the speed of displaying new frames is high enough, the human brain, which is unable to recognize each frame separately, is deceived and thinks that it is watching a moving image. Old projectors created the illusion of a moving image or video for the audience by moving tapes or films consisting of small images in front of a lens. But today’s screens for this purpose quickly refresh the image on the screen and display a certain number of image frames in front of the user’s eyes every second. The number of frames displayed by a screen per second, or in other words, the number of times the screen image is refreshed per second, is called the “refresh rate” of that screen. So for example, a screen with a refresh rate of 120 Hz is capable of refreshing 120 times per second, displaying a new frame each time.

A higher refresh rate means that more images or frames are displayed per second, and as a result, the interval between one frame and the next will be shorter. In this way, any kind of movement and change in image elements between frames will be more detailed and the movements will look smoother. The interval between frames on a 60 Hz screen is about 16.6 milliseconds. While the same amount for the 90 Hz refresh rate is equal to 11.1 milliseconds, and the complete refresh of the image on a 120 Hz screen takes 8.3 milliseconds. While the refresh rate of old televisions was 30 Hz, most of today’s televisions and mobile devices have screens with a refresh rate of 60 Hz. Of course, in recent years, we have seen the use of screens with a refresh rate of 90 and 120 Hz in some high-end televisions and mobile devices. Of course, it’s good to know that your smartphone’s screen will not be refreshed all at once. Instead, each row of pixels on the screen is updated at a certain rate until finally the state of all pixels on the screen is changed based on the new frame. If you want to see this happen with your own eyes, just take a video of a screen in slow motion and pay attention to the refresh of the frames and the state of the pixels of the image while watching that video.

The concept of frame rate and its relationship with refresh rate

As mentioned, the number of times a screen can refresh itself per second is referred to as the refresh rate. While the frame rate is the frequency of displaying the frames of a video file, a video game or a graphic application. In other words, the number of image frames that can be displayed per second of a graphic or video content is called the frame rate of that content. The refresh rate measurement scale is Hertz (Hertz or Hz), but the frame rate is measured with the FPS or frames per second scale. Movies have traditionally been shown at a frame rate of 24 fps, and today’s video games typically run at a frame rate of 30 fps to 90 fps. Of course, many video games for personal computers are capable of running at frame rates higher than 90fps if the user’s screen supports it. This is where the display’s higher refresh rate becomes especially important.

To get the desired result, it is necessary that the frame rate and the refresh rate are in sync with each other. If the two are out of sync, image quality can quickly deteriorate. Especially if the frame rate of the video being played is higher than the refresh rate of the screen. Running a video game with a frame rate of 120fps on a 60Hz screen may cause an undesirable effect called “screen tearing”. In this case, horizontal lines will appear on the image and it will look like parts of the screen have been cut. Playing a graphic content with a low frame rate on a screen with a high refresh rate will also cause this screen feature to remain unused and the image quality will not be different from normal screens. To produce the best possible image quality, the frame rate and refresh rate must be matched. Running a video game at a frame rate of 120fps on a screen with a refresh rate of 120Hz or higher will look much smoother and better than running the same game at a frame rate of 60fps on a 60Hz screen. To better understand the frame rate and its effect on the quality of moving images, I suggest you watch this short video. we do.

The concept of tactile sampling rate

The touch sampling rate, also called the touch refresh rate, has a different concept from the screen refresh rate. The touch sampling rate, simply put, is the number of times per second that a screen can detect a user touching the screen. Or in other words, this feature tells how many times your smartphone’s touch screen is able to refresh itself to register the user’s touches every second. Imagine that the touch sampling rate or frequency of a smartphone is 60 Hz. This means that such a device checks 60 times per second to see which areas of the screen have been touched by the user. A simple calculation indicates that in this case each touch screen sampling cycle takes about 16.6 milliseconds. In other words, from the time the user touches the screen, it takes a maximum of 16.6 milliseconds until this touch is registered by the device and the corresponding reaction begins. Therefore, the higher the touch sampling rate, the shorter the intervals between samplings and the less time it takes from the moment of touching the screen until the touched points are recorded, processed and the response related to it is displayed on the screen. For example, increasing the touch sample rate to 120Hz reduces this cycle time to 8.33ms. In the same way, by increasing this rate, touching the screen is recognized faster and as a result, the device will be able to react to the user’s touch commands more quickly.

With the passage of time and the improvement of various components of mobile devices, the touch sampling rate also increases gradually. But as you might expect, gaming smartphones are leading the way. For example, the smartphone

Difference between 60, 90 and 120 Hz refresh rate for smartphones

Many users may not directly and accurately notice a particular difference when holding a smartphone with a refresh rate higher than 60 Hz. It is just possible that the device seems a little smoother and faster to them, and that this issue is related to the fact that the device is newer and more powerful. The difference between a 90 Hz screen and the usual 60 Hz screens may not be noticeable to the general public. Especially since many mobile apps and games still don’t support frame rates above 60 Hz. However, for a user who has been using a 60Hz smartphone for years, the jump to a 120Hz screen will likely be noticeable. Screens that use a higher refresh rate display more frames per second, making the movement of moving elements on the screen appear smoother and sharper. As a result, the user feels that the device works more smoothly and reacts faster to touch commands. For example, scrolling through the list of apps and switching between device menus may feel smoother and faster. Also, increasing the refresh rate reduces the blurring of screen elements during sudden image movements or so-called motion blur.

Improvements from increasing the refresh rate largely depend on the application’s support for higher frame rates, the type of content displayed, and the degree of mobility of the image elements. In general, the effects of this feature are more noticeable in applications and content with high graphic mobility. Therefore, it is natural that the increase in refresh rate is far more effective on the display quality of video games and is more important for those interested in this type of content. For this reason, the first mobile devices equipped with screens with a high refresh rate were gaming smartphones. Devices from the ASUS ROG Phone, Razer Phone, and Nubia Red Magic family are among these gaming phones that have been equipped with screens with 90 and 120 Hz refresh rates in their recent generations.

Is the higher the refresh rate the better?

At first, the answer to this question may seem simple and obvious. But in fact, this issue is a bit complicated and the answer depends on different factors. Some of the considerations and negative points associated with using screens with a high refresh rate in summary are:

• Increasing the refresh rate of the screen will increase the consumption of battery charge.

• Such screens require a powerful graphics processor and by creating more graphics processing load, they increase the temperature of the device to some extent.

• The use of these screens is associated with a higher cost and increases the total price of the device.

• To really take advantage of a screen with a high refresh rate, it is necessary that the user interface of the operating system, applications and games also have the ability to run at a high frame rate.

A screen with a higher refresh rate will consume more of the device’s battery. This same problem can be considered the biggest disadvantage of these types of screens. A 120Hz screen refreshes twice as much per second as a normal screen, thus placing more strain on the device’s battery. In addition, the graphic processor of the smartphone, which needs to process more graphics frames, must be powerful enough to handle this task. Also, by imposing more load on the graphics processor, its temperature rises and its energy consumption increases to some extent. For these reasons, most devices equipped with screens with a higher refresh rate provide users with the possibility of reducing the refresh rate in the smartphone settings. Even a device like Google Pixel 4 At the beginning of entering the market, the refresh rate of the screen was automatically adjusted based on the brightness of the screen, and only when the brightness level of the screen was higher than 75%, the refresh rate was set to 90 Hz, and otherwise to the refresh frequency of 60 Hertz was placed. Google, of course, after some time, with the protest of users, the refresh rate of 90 Hz screen in all brightness levels Pixel 4 XL activated and in Pixel 4 also changed the screen refresh rate from 90 to 60 Hz only by passing the brightness level of 42%.

Furthermore, like any other new technology, equipping mobile devices with screens with a high refresh rate increases costs and the final price of the product. According to Jerry Kang, a display technology expert at HIS Markit, responding to the demands associated with high frame rates and high refresh rates will require redesigning the materials and circuits used to make pixels. This increases the cost of screen production. The high price of these screens, on the one hand, and their need for a powerful graphics processor and a high-capacity battery, on the other hand, have limited the use of this new technology to some gaming smartphones and some flagship devices. Of course, with the increase in the use of this type of screen and their mass production, it is expected that production costs will gradually decrease and in the not too distant future we will see them being used in mid-range smartphones as well. Moreover, the leaked news from Oneplus indicates that the company’s upcoming mid-range product will be equipped with a 90 Hz screen.

Another important challenge in the way of screens with a high refresh rate is the need to optimize the graphic content displayed on mobile devices to fit them with the output frequency of the screen. Because if video content is played with the same old frame rate on screens with a high refresh rate, there will be no difference between the quality of these new screens and the older and cheaper ones. Currently, most of the user interfaces of operating systems, animations used in applications and even video games made for mobile devices are capable of running at a maximum frame rate of 30 to 60 Hz and do not support higher frame rates. Therefore, it is necessary that along with the development of screen hardware, the developers of operating systems, applications and games should also prepare their software products to support higher frame rates. Otherwise, a group of users will pay a higher price to buy smartphones equipped with 90 and 120 Hz screens, but only a limited number of applications will be able to take advantage of this feature of their devices.

But the good news is that at least mobile game developers are quickly optimizing their games to support high frame rates. Currently, popular games such as Real Racing 3, Temple Run 2, Minecraft Earth, Alto’s Odyssey, Vainglory and Injustice 2 can run at 120 frames per second. If your mobile device has a screen with a high refresh rate or you are planning to buy a smartphone with this feature, we suggest the complete list of games that are capable of running at a high frame rate from here see

Which devices on the market have high refresh rate screens?

Due to the high importance of frame rate in video games, high refresh rate screens were first used in gaming smartphones. For the first time in 2017, Razer released its gaming smartphone called Razer Phone 2 and with the same 120Hz refresh rate. Razer still holds the title of the only smartphone vendor with a 120Hz display refresh rate until 2019. But contrary to expectations, the third member of this family was not introduced in 2019. It is expected that this year we will see the launch of Razer Phone 3 by this famous and leading company in the field of video game equipment. After Razer, it was the turn of Asus company, which has a special gaming smartphone. self-named Asus ROG Phone in 2018 with a screen refresh rate of 90 Hz to provide mobile video game enthusiasts.

Since the release of the first gaming smartphone with a screen refresh rate above 60 Hz, it took about 2 years for this technology to be applied to a normal smartphone and sold on a wide scale. The Oneplus company can be the leader in using this technology in smartphones. Considered normal and bestseller. This company for the first time in the first half of 2019 smartphone Oneplus 7 Pro entered the market with a 90 Hz screen.

• Asus ROG Phone

• Google Pixel 4

• Google Pixel 4 XL

• Xiaomi Black Shark 3

• Xiaomi Black Shark 3 Pro

• Xiaomi Mi 10

• Oneplus 7 Pro

• Oneplus 7T

• Oneplus 7T Pro

• Realme 6

• Realme 6 Pro

• Realme X2 Pro

• Oppo Reno 3 Pro 5G

• Oppo Reno Ace

• Nubia Red Magic 3S

• Asus ROG Phone 2

• Samsung Galaxy S20

• Samsung Galaxy S20 Plus

• Samsung Galaxy S20 Ultra

• Xiaomi Mi 10 Pro

• Xiaomi Redmi K30 5G

• Razer Phone

• Razer Phone 2

• Realme X50 5G

• Sharp Aquos R3

• Poco X2

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