Recently, a very friend is planning to change the phone, so he asked the author here, hoping that I can recommend several suitable LCD screen mobile phones. I myself was very surprised, I did not expect that my friend is still an LCD sentiment party, to know that now that the LCD is thinner, the real "die-hard fans" are actually not many.
But after asking, I learned that he is not a sentiment party, and the reason for choosing LCD is very simple, that is, he feels that his myopia has deepened again, and he suspects that it may be the "pot" of oled screens. He said that there was no problem with the eyes of the LCD screen before, but since last year he changed to a new machine equipped with an OLED screen, he felt that myopia had increased again, so he wanted to change it back.
To be honest, just recommend a few phones, which is no big deal, but oled screen "eye damage" is true, but LCD screen must be more eye-catching? For myopic people, this is not necessarily the case. You know, as long as it is an electronic screen, whether it is LCD or OLED, it will be harmful to the human eye. The reason for this is that it starts with screen blue light and strobe.
1. The effect of blue light on human eye vision
As we all know, any electronic screen will produce blue light, the so-called blue light, in fact, refers to the wavelength of 380nm-500nm visible light. Note that it is the three words of "visible light", what is visible light, is the light that can be seen, sunlight is the typical visible light, and this also means that blue light is almost everywhere.
Are you a little surprised, we often hear that the light emitted by mobile phones and computer screens will be harmful, but what have you heard that sunlight is harmful? On the contrary, when it comes to sunlight, everyone thinks more about vitality and vitality, and even basking in the sun is still a very healthy way of life.
So, why is it that the same is blue light, and the light emitted by the mobile phone is harmful to the human eye and the sunlight will not? And that brings us to the classification of blue light.
In fact, different wavelengths of blue light have different effects on the human eye, but there is a type of short-wave blue light that will cause harm to the retina and threaten our fundus health, and the blue light produced by mobile phones, tablets, computers, and televisions is this harmful short-wave blue light.
Human eye structure diagram
For myopic personnel, due to the phototropism of the human eye, the natural contrast to the strong light is more sensitive, the blue light of the general electronic screen is brighter than other light other than the purple light, but the wavelength of the short-wave blue light is shorter, so it will cause the retinal focus to move forward, for a long time, in the process of repeated "sawing" of the ciliary muscle, it will cause muscle loss of elasticity, light will cause eye fatigue, and the heavy is the deepening of myopia or myopia!
The above content, online encyclopedia we can also understand the approximate, but what we may not know is that in the LCD and OLED two screens, LCD emits a blue light wavelength is shorter. This means that if you simply discuss the harm of blue light to the eyes, in fact, LCD is still higher than OLED.
Is it a bit of a subversion of cognition, how to say that LCD not only has not been more eye-protecting than OLED but also more eye-hurtful? In fact, there is not, the reason is that there is another factor that affects the human eye, that is, stroboscopic. Unfortunately, olED screens are precisely the hardest hit areas for stroboscopics.
2. The impact of stroboscopic on the strength of the human eye
People in the digital circle are familiar with two words, one is called DC dimming, and the other is called PWM dimming. Among them, most LCD screens support DC dimming, while OLED screens use PWM dimming mechanisms. The principle of DC dimming is very simple, that is, by increasing or reducing the power of the screen circuit to change the brightness of the screen, the power becomes larger, the screen is brighter, the power becomes smaller, the screen is dark, and its characteristics are almost no stroboscopic.
The PWM dimming is different, the OLED screen using PWM dimming is not continuously illuminated, but constantly lights up, extinguishes, lights up, extinguishes... When the frequency is fast enough, the human eye will think that the screen is always on.
But people are not the same, some people will be very sensitive to stroboscopic, which is why everyone in the use of the same OLED screen mobile phone, some people will feel that the screen makes them uncomfortable, causing migraines, eye fatigue, dizziness and other symptoms, and some people will not have this feeling.
In addition, due to the self-illumination characteristics of OLED screens, when we use mobile phones in a low-light environment, the PWM dimming mechanism can only reduce the screen brightness by adjusting the screen "light up" and "off" frequencies.
In this case, the frequency of screen flashing will be lower, although the human eye is still difficult to see, but has begun to produce pressure on vision, unconsciously, prompting the eye ciliary muscle will continue to enlarge, shrink, always in a tense state of movement, so if the eyes are affected by stroboscopic for a long time, it will indeed cause vision loss or aggravation of myopia.
3. How should myopic people choose a smart phone?
There is no doubt that whether it is blue light or strobe, it will be harmful to vision, and LCD screens will not be more eye-catching than OLED. The reason why everyone misunderstands this is mainly because the LCD screen rarely makes the eyes produce a harsh, dry and other uncomfortable feelings, but in terms of nature, LCD or OLED screens are not very friendly to myopia.
But is myopia insulated from smartphones? That, of course, is impossible. Since this is the case, then everyone needs to pay more attention when purchasing mobile phones.
As we mentioned earlier, the blue light and strobe produced by electronic screens can be harmful to the vision of both eyes, and mobile phone manufacturers have not turned a blind eye to this, but have done a lot of work. This is undoubtedly good news for the myopic population.
TÜV Rheinland's low blue light certification
For example, in terms of anti-blue light, we often see manufacturers in the mobile phone selling point to promote a variety of eye protection certification, common such as TÜV Rheinland low blue light certification, SGS screen eye protection certification, etc., these two certifications are not casually given a little money to pass, but there is a set of highly credible, authoritative testing standards, after this certification of the product can be recognized in the relevant market, in the eyes of users and manufacturers the same.
At present, some mainstream mobile phone brand products will use relevant eye care certification, such as OPPO, vivo, glory, millet, Samsung, etc., up to the flagship down to the thousand yuan machine is very common. Although some advertising is suspected in it, it is also a very authoritative endorsement, relatively speaking, it is still very reliable, at least everyone will not be very blind when choosing the machine.
Difference between DC dimming and PWM dimming (source network)
In terms of anti-strobe, the current eye protection measures of mobile phones are also in place. LCD mobile phone is relatively simple, there are many support DC dimming, this straight to the dimming method is simple and efficient, relatively friendly to vision, especially for myopic people, DC dimming can alleviate the fatigue of the human eye to look at the phone for a long time, if you are very sensitive to low-frequency PWM dimming, it is indeed more suitable for choosing this one. However, it should be noted that many LCD mobile phones will also introduce PWM dimming mode, among which low-end LCD mobile phones will even use low-frequency PWM dimming, which is also very eye-hurting to use for a long time.
Of course, it is a fact that there are fewer and fewer LCD mobile phones, especially in high-end product lines, LCDs are on the verge of extinction. In this case, even if you like the LCD, it is useless, anyway, only OLED is available. Fortunately, although OLED cannot fully achieve pure dimming, there are also products that support eye protection technologies such as "DC-like dimming" and "high-frequency PWM".
The Honor 60 series supports high-frequency PWM dimming and low blue light certification of TÜV Rheinland
For example, the Honor 60 series, when the user uses the mobile phone in low light conditions, it will trigger high-frequency PWM dimming, which can achieve a very comfortable screen experience, and can reduce the loss of color, so that the mobile phone has no serious strobe under low brightness, and can also maintain the purity of the color, so that the display effect is more accurate.
Finally, there is something to say:
For myopic people, there is no standard answer to which dimming method to choose. Because this test is the manufacturer's proficiency in screen tuning, if the tuning is not mature, even if the best eye protection technology is applied, it is actually useless.
If you are really afraid of hurting your eyes, in fact, the LCD screen mobile phone that supports anti-blue light certification and supports the DC dimming mechanism will indeed be a good choice, and the current mainstream brand LCD mobile phones have no problem, and everyone can choose with confidence. Of course, if you are not interested in LCD, then you can still choose OLED screen mobile phones, provided that it supports high-frequency PWM or DC-like dimming and other technologies. In any case, support is better than not supporting.
Finally, no matter what screen you use, what mobile phone, the easiest way to protect your eyes is to develop good machine habits, try not to use it in a low-light environment, and the screen should not be too low brightness. In addition, it is important to master the time of use of the machine. After all, everything emphasizes a restraint, and playing with mobile phones excessively without moderation is bound to put pressure on the eyes.
(*Images without ZOL watermark are from the Internet)
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