Since the popularity of OLED screen mobile phones, there has been a saying in the mobile phone circle that OLED screen is harmful to the eyes. To be precise, it’s the low-frequency PWM dimming of the OLED screen that hurts the eyes. After that, some new flagship phones started to bring features like eye protection screens and DC dimming. And this year, POCO X5 Pro 5G, which is about to be released, has introduced the concept of “1920Hz high-frequency PWM dimming”. But… What exactly is PWM dimming? Why do the eyes hurt? What is the difference between the 1920Hz high frequency PWM dimming of POCO X5 Pro 5G and others?
This article will take the upcoming POCO X5 Pro 5G as an example to tell you about phone screen and eye health.
What is PMW dimming?
PWM dimming is a phenomenon that appears with OLED screens. Due to the characteristics of OLED screens, normally each pixel can only be turned on or off, and it is difficult to adjust the brightness individually. To change the screen brightness, the PWM dimming mode is used.
The principle of PWM (Pulse Width Modulation) dimming is to alternately blink the display with a certain frequency of “on → off → on → off” in a very short period of time. By adjusting the “on” and “off” time ratio, and using the visual residual of the human eye, it adjusts the screen brightness from 0% to 100%. For example, the screen is on all the time when the brightness is 100%, and when the brightness is 50%, as long as the screen is off half of the time, our human eyes will mistakenly think that the screen brightness has decreased. .
Why does low frequency PWM dimming hurt the eyes?
Although the PWM dimming solution solves the brightness adjustment problem, it also leads to flickering problems. During the PWM dimming process, if the operating frequency is too low, the human eye will feel flickering. In particular, many people feel eye discomfort when using phones in low brightness at night, because the screen dimming frequency is very low in low brightness, causing aggravated eye fatigue.
Therefore, in order to take full advantage of the visual residual phenomenon of the human eye, the operating frequency of PWM dimming should be as high as possible: PWM dimming is positively correlated with display strobe according to international standards. , but when the PWM frequency exceeds 1250Hz, it will not significantly affect the view. By comparison, the frequency used by most OLED screens on phones is between 180Hz and 480Hz, which is at the upper limit of the perceptible range of human visual nerves, so many people with sensitive eyes will inevitably experience fatigue. ocular.
In order to solve the problem of eye damage caused by low-frequency PWM dimming, some OLED screen mobile phones have added software DC dimming option, that is, changing the current to adjust the brightness of the light (when the brightness is high). The step current rises and falls when the brightness is reduced), this brightness adjustment method is direct current dimming, which is commonly known as DC-type dimming. It sounds easy, but it is very difficult to precisely control the light intensity of tens of millions of pixels on the screen, so after turning on type CC dimming, it will cause uneven color and brightness between different pixels, which affects the display effect. Therefore, this method has not been adopted on a large scale.
High-frequency PWM dimming debut, new OLED eye protection upgrade
Since low-frequency PWM dimming hurts the eyes, there are DC dimming display problems, and high-frequency PWM dimming appears, such as the 1920Hz high-frequency PWM dimming carried by POCO X5 Pro 5G. As it is currently recognized as the best dimming method, it can not only solve the problem of strobe eye damage on low brightness OLED screens, but also avoid image quality loss caused by DC-like dimming methods. . With a good screen and eye protection, it can be called black technology!
Judging from the actual effect, the advantage of 1920Hz high-frequency PWM dimming is obvious. Looking at the phone for a long time is not easy to cause eye fatigue, especially when using the phone at night, there is almost no eye discomfort! For people who are sensitive to strobes, this is a huge improvement in experience!
And from the perspective of the display effect, the POCO X5 Pro 5G’s 1920Hz high-frequency PWM dimming AMOLED screen is also very good. The screen is bright and transparent, and there are no issues like brightness and color unevenness like DC dimming.
Although the POCO X5 Pro 5G is not the first model to be equipped with 1920Hz high-frequency PWM dimming, you should know that only a few flagship phones are equipped with this, even the iPhone 14 series. Among phones of the same grade, POCO X5 Pro 5G is really rare, which shows how profitable it is.
108MP main camera, presenting good 4K images
In addition to the screen, the image is also the highlight of this POCO X5 Pro 5G. One of the most noteworthy is the 108MP main camera.
The benefits of ultra-high pixels are obvious. The biggest feeling in daily shooting is that the clarity of the photos is high enough and the photos remain clear even after being enlarged several times, making post-production easier and stress-free. Although ultra-high pixels can bring excellent image effects, photos with hundreds of millions of pixels also pose a challenge to the performance of mobile phone processors.
POCO X5 Pro 5G is equipped with a well-received mid-range to high-end Qualcomm Snapdragon 778G chip. This chip is gentle in daily use. It keeps cool and doesn’t get too hot even when dealing with large-scale gaming. The experience is very good. With this chip, the potential of the 108MP camera module can be fully released. With the solid processor upgrade, the Snapdragon 778G can fully unlock the potential of the 108MP camera module. Where 9-in-1 binning technology and 778G AI capability, content captured at night will look extremely good.
In the era of short videos, the demand for video recording cannot be left behind. This time, POCO X5 Pro 5G has specially improved 4K video recording function and VLOG mode. You don’t need to carry a professional camera to record high-quality videos. You can use your phone to capture high-quality and wonderful videos anytime, anywhere, and play easily with video platforms like TikTok.
In addition, POCO X5 Pro 5G also has ultra-wide angle and macro lenses, which can meet the shooting needs of different scenes. For example, I like to use a super wide angle lens when I travel. It can capture more magnificent natural scenery, and can also accommodate more people to photograph at the same time when taking a group photo.
Not only does it have eye protection, this screen has more wonders
Eye protection is not everything. POCO X5 Pro 5G also brings 120Hz, 10-bit, Flow AMOLED, and other highlights.
First of all, the lighter and thinner Flow AMOLED screen has successfully reduced the burden of POCO X5 Pro 5G. It has excellent performance in terms of body weight and thickness: only 7.9mm thick and 181g in weight, which is the best in the same price range on the market. For comparison, the models of the same price that I have used recently are basically 8mm thick and weigh more than 200g, so the POCO X5 Pro 5G is very light.
120Hz high refresh rate provides a smooth experience, especially on streaming software like Twitter and Facebook, 120Hz high refresh rate provides a silky smooth experience. In addition, this display also supports a 10-bit display, which can display up to 1.07 billion colors. Compared to conventional 8-bit screens, the screen displays more accurate colors and the transition between different colors is more natural. Whether it’s for everyday audiovisual entertainment or professional image viewing, this screen is top-notch.
Overall, POCO X5 Pro 5G with a display that combines many advantages, such as Flow AMOLED, 1920Hz PWM dimming, 120Hz high refresh rate, and 10-bit color depth, is the best in its class.
Based on this information, do you think POCO X5 Pro 5G is profitable? Do you have any other expectations for the mobile phone screen? What do you think is the most suitable price for POCO X5 Pro 5G?
Price, launch and cost-benefit ratio
Judging by the currently known configurations, be it Flow AMOLED display, 1920 Hz PWM dimming, 108 MP main camera or 4K video recording, these configurations that were originally exclusive to flagships are now available on POCO X5 Pro 5G. As a cost-effective quasi-flagship phone, POCO X5 Pro 5G is definitely a great value.
In terms of price, current phones equipped with similar configurations are usually priced at more than 400 or even 500 US dollars. Considering the high cost performance of POCO, the price of POCO X5 Pro 5G can be within 400 US dollars. If so, POCO X5 Pro 5G will become the first cost-effective bomb in 2023.
If you still want to know more about POCO X5 Pro 5G, you can follow POCO’s official Twitter/Facebook/YouTube account. POCO will hold a new product launch conference on February 6 at 8:00 Beijing time. more surprises will be announced at the press conference. If you have other ideas about this product, welcome to comment and discuss!