Does the organic light-emitting diode screen of mobile phone really hurt your eyes? In today's life, with the progress of science and technology, the upgrading of mobile phones is becoming more and more advanced, but it is also accompanied by some problems. For example, people's mobile phone screens now use organic light-emitting diode screens. Many people think that the organic light-emitting diode screen of mobile phone hurts their eyes, so does the organic light-emitting diode screen really hurt their eyes? Let's have a look!
Does the organic light-emitting diode screen of mobile phone really hurt your eyes? 1 At this stage, there are few new machines equipped with LCD screens in the mobile phone market. Except for Apple, the flagship models are directly released by mobile phones without LCD screens. Compared with the traditional LCD screen, Samsung led OLED screen has a wider color gamut, higher contrast and lower power consumption in some cases. Because of this, many mobile phone manufacturers gradually shift from LCD screens to organic light-emitting diode screens.
Firstly, the organic light-emitting diode screen adopts the self-luminous display mechanism. The so-called self-luminescence means that when current passes through organic materials, pixels will emit light by themselves. The traditional LCD uses backlight, so the OLED screen can display information. At the same time, the organic light-emitting diode screen has the advantages of purer black, ultra-high contrast and power saving due to its own light emission. At the same time, organic light-emitting diodes can achieve off-screen fingerprint because of the material, while LCD screen can not achieve off-screen fingerprint at this stage because of its thick whole screen and complex structure.
Of course, the advantages are not limited to these. The screen packaging frame of the OLED screen is narrow, which can be bent to a certain extent, but everything has two sides, and the OLED screen is not all advantages.
The first is the "burning screen" that everyone has heard of. The reason for this phenomenon is also due to the self-luminous characteristics of organic light-emitting diode screens. The reason why the OLED screen is not completely lit up like LCD is that each pixel uses self-luminescence, which will lead to the same working time for each pixel of the OLED screen. Some pixels display more red, so this pixel has a little more red aging than other pixels. After a long time, the red color emitted by this pixel is much brighter than other pixels. In short, it is the residue caused by uneven screen aging.
The second point is the stroboscopic problem. Here we need to understand two concepts: DC dimming and PWM dimming. The so-called DC dimming is to adjust the brightness of the screen by adjusting the current and voltage of the screen; PWM dimming is to adjust the flicker frequency of the screen, and adjust the brightness seen by the naked eye through the interval between two lights on the screen and the visual persistence phenomenon of the human eye. According to relevant data, the stroboscopic frequency of organic light-emitting diode screen should at least reach 1250Hz, which will not cause harm to eyes; Once it is lower than this frequency, it will cause problems such as migraine. But at present, the stroboscopic frequency of mainstream OLED screens is only 250Hz, which is far lower than the frequency that is harmless to eyes. Therefore, some mobile phones with OLED screens will use DC dimming as a selling point when they are promoted.
The third point is blue light. As we all know, blue light is the most harmful to human eyes. The wavelength of blue light is 450 nanometers. Compared with the red light and yellow light with the wavelength of 600nm, the damage of blue light to retina is 10 times that of red light and yellow light! The damage to retinal burns is 1000 times that of red light and yellow light! First of all, we should know that any white light contains blue light, and of course natural light also contains blue light. It is because there is blue light in these lights that we can see blue objects.
The color temperature is the most direct parameter of the proportion of ambient white light composed of colored light or screen backlight. Low color temperature, that is, Huang Ping backlight, low proportion of blue light; A high color temperature, that is, a screen backlight that displays blue, has a high proportion of blue light. In other words, lowering the screen color temperature can directly reduce the dose of blue light on the screen of the mobile phone. The eye protection mode on the mobile phone also reduces the proportion of blue light by reducing the screen color temperature on a large scale, thus achieving the purpose of relative eye protection. But the most direct impression is that the screen becomes very yellow.
The fourth point is that the OLED screen is low in pixels per inch. As we all know, the three primary colors of light are red, green and blue. Of course, each pixel on the screen also has three colors. Because the screen is composed of many pixels, the more pixels there are, the clearer the screen looks when the screen area is constant. However, the pixels of the OLED screen will lead to the same resolution of the two phones, but the clarity of the screen is different.
At the same resolution, the OLED screen is not as clear as the LCD screen. This is because the arrangement of criminal charges on the OLED screen is different from that on the LCD screen. So why do different arrangements with the same resolution result in different actual pixels? Mainly the problem of sub-pixel arrangement. Standard RGB is a pixel composed of red, yellow and blue sub-pixels, while PenTile rhombus arrangement is a pixel composed of four RGGB sub-pixels. Two RG or RB sub-pixels can be used between the upper and lower pixels, which leads to the loss of actual pixels, as well as other pixel arrangements.
In the pixel arrangement of traditional LCD screen, each pixel has three colors of R, G and B with the same area and size, but the OLED screen is not.
At present, the pixel arrangement of organic light-emitting diode screen mainly includes the following types:
Samsung /LG: standard PenTile arrangement, RGGB-PenTile
BOE: Triangular Pentagon Arrangement in RGGB Delta
Visionox/Tianma: standard triangle arrangement, RGB- triangle
To put it simply and intuitively, if the horizontal pixel number of the standard RGB array screen is 1080, that is, 1080P, then the pixel number of the standard PenTile Diamond Array (RGGB) is 720, that is, 720P, and one third of the pixels will be lost. The standard RGB-Delta array has 540Pixels, that is, 540 p, which will lose half of the pixels; Triangular pentagonal arrangement (a mixture of pentagonal arrangement and triangular arrangement) is between the standard pentagonal arrangement and the standard triangle.
Generally speaking, Samsung's diamond arrangement is the best scheme for the pixel arrangement of organic light-emitting diode (OLED) screen on mobile phones at present. However, this arrangement is patented and cannot be used by other screen manufacturers except Samsung.
With the development of mobile phones, the proportion of screens will be higher and higher. LCD screen can't meet this requirement because of its characteristics. Of course, with the development, you won't see them on your mobile phone. Although many people still like LCD screens. However, with the progress of technology and the development of science and technology, these shortcomings of OLED screens may be gradually improved. Maybe there won't be problems such as screen burning and stroboscopic.
Does the organic light-emitting diode screen of mobile phone really hurt your eyes? 2 "I changed my high-end OLED screen phone, and my eyes are uncomfortable." There are more and more netizens with similar questions. Does the OLED screen really hurt your eyes? Recently, the reporter conducted an investigation into this.
"Looking at the OLED screen phone, my eyes are broken."
"Never dreamed that I happily changed my new mobile phone. After a few days, my eyes began to feel uncomfortable. " Recently, Beijing office worker Duan Chun (pseudonym) reflected such a thing to the Zhongxin.com reporter. ..
Duan Chun said that she went to see a doctor and was diagnosed with floaters. The doctor advised her to watch her mobile phone less recently. Strangely, after she switched back to her old mobile phone, her symptoms improved.
Duan Chun's new mobile phone is an organic light-emitting diode screen mobile phone, and the old mobile phone is an LCD screen, so she suspects that "eye discomfort may be related to the organic light-emitting diode screen."
The reporter's investigation found that there are not many users who have such doubts. There are nearly 700,000 related links in searching for "organic light-emitting diode screen hurts eyes" on search engines. Many related posts of Baidu Post Bar have also aroused the exclamation of netizens: I also have this symptom.
Does the OLED screen really hurt your eyes?
In the past two years, organic light-emitting diode (OLED) screen mobile phones have become the mainstream, and flagship machine, a major mobile phone manufacturer in the market, has embraced OLED screens one after another, or embarrassed to say that he is flagship machine.
The question is, does the OLED screen really hurt your eyes? The reason why the mobile phone with organic light-emitting diode screen feels uncomfortable is because the "screen flash" is working.
LCD usually uses backlight to illuminate the screen, and the stroboscopic frequency can reach several kilohertz (Hz), and basically no stroboscopic problem will be encountered. Organic light-emitting diode screen is self-luminous by pixels, and its stroboscopic frequency is limited by low power. At present, the flicker frequency of PWM dimming on the OLED screen of many mobile phones is about 2 15Hz-250Hz.
IEEE (Institute of Electrical and Electronics Engineers) once wrote that the stroboscopic range with low health risk is above 1250Hz, "stroboscopic may lead to migraine and other diseases."
In the eyes of professionals in the communications industry, this value is not high. But even this standard, the medical profession has not given a clear answer, and the industry is very controversial.
In an interview with Zhongxin. com. Com, director of ophthalmology at the Eye Hospital of Chinese Academy of Chinese Medical Sciences, said that whether it is a mobile phone screen, a computer screen or an iPad screen, it is easy to cause visual fatigue after long-term use, and it should not be directly related to the screen.
"There is no direct relationship between the OLED screen and eye injury," Zhang Chi, a professional in the communication industry, also said in an interview that people's eyes can hardly feel the stroboscopic of the OLED screen. "Visual fatigue may be caused by watching the screen for a long time and using your eyes too much."
Zhang Huang, CEO of Meizu, once said that both LCD and OLED will cause harm to eyes, because the LED lights at the bottom of them will emit blue light that is harmful to eyes, which is inevitable, but there is a way to improve the OLED screen, that is, the OLED screen can turn on the eye protection mode (similar to PWM dimming) and change the color tone of the screen to yellow.
Many netizens also suggested that when using organic light-emitting diode screen mobile phones, the brightness should be raised as much as possible, and the lower the brightness, the more harmful it will be to the eyes. The principle is that when the screen brightness decreases, the mobile phone screen will achieve this effect by further reducing the strobe frequency, which is called PWM dimming.
Some ophthalmologists have suggested that "human eyes have different perceptions of the stroboscopic display of organic light-emitting diodes, and some people are more sensitive. Sensitive users are best to use LCD phones. " In this regard, there is currently no unified medical statement.
Whether the organic light-emitting diode screen of mobile phone is good or not depends on "luck"
Some netizens have questions: Why are they all organic light-emitting diode screens? Some mobile phones feel good when used, while others feel uncomfortable when used?
Some netizens even did an experiment: by comparison, it can be clearly felt that the screen of P30 Pro is not as good as that of Mate20 Pro. This question is actually very easy to understand. Different mobile phones may use different screens, and different manufacturers such as Samsung, LG and BOE have differences in technology and product quality.
The test results released by China Consumers Association in June show that the screen size is not the main factor affecting visual fatigue, but the materials and physical properties of different electronic screens may be the main factors.
Even if it is the same mobile phone, the screen quality depends on "luck". Because the same model of mobile phone may use different brands of organic light-emitting diode screens. Many times, mobile phone manufacturers have not explained this, nor have they listed the providers of mobile phone screens in detail in the mobile phone configuration instructions.
For example, the screen suppliers of Mate20 pro are JD.COM and LG, and some of their products appear "green screen" phenomenon after they are listed. According to media reports, all mobile phones with LG screens have green screen problems, that is to say, the same price, the same mobile phone, may have different screen configurations. Whether the mobile phone works or not depends on luck.
This kind of thing is almost a common problem in the industry. In the early days, both iPhone XS and XS MAX were Samsung's organic light-emitting diode screens, but then Apple listed LG as the second iPhone XS screen supplier, which means that the latter batches of iPhone XS and XS MAX may be mixed into LG screens. Whether consumers buy LG screens or Samsung screens depends on luck.
Do mobile phones have to use organic light-emitting diode screens now?
If the organic light-emitting diode screen is easy to make users visually tired, why not use it directly? In fact, it is difficult to say "no" to the OLED screen now.
The color display on the OELD screen is brighter, fuller and more realistic. Nowadays, high-end mobile phones with organic light-emitting diode screens have become the mainstream; The general LCD has been decentralized to low-end mobile phones and is no longer the preferred screen material.
Why is this happening? "Off-screen fingerprints, ultra-thin and other terminal products can only be realized by organic light-emitting diode screens." The industry generally believes that.
Now there is good news. On June 27th, BOE suddenly announced the successful development of fingerprint technology under LCD screen, which will be mass-produced at the end of this year. As the industry giant Samsung has not published similar research results, many netizens have left messages: "Whether it is a mule or a horse, we will wait and see."
It is unrealistic for the mobile phone industry to let all organic light-emitting diodes return to liquid crystal. Some people even think that this means a retrogression in technology. From the point of view of eye health, as Huang Zhang said, LCD also emits blue light that is harmful to human eyes. If you really want to protect your eyes, you can only obey the four-letter word: play less mobile phones.