Nowadays, everyone's work and life are more and more inseparable from electronic devices. The average urban white-collar worker life is to look at the computer at work and look at the mobile phone at leisure after work. It's normal to spend 8 to 10 hours a day looking at a screen. So which is more hurtful to use mobile phones, LCD or OLED screens every day?

We can talk about the damage of these two screens to the eyes.

LCD screen – shortwave blue light damage

Today's LCD screens are displayed with LED backlight. Since backlighting requires the effect of white light, the industry usually uses blue LEDs mixed with yellow phosphors to form white light. Therefore, it is difficult to avoid emitting "short-wave blue light" by this screen itself. This blue light has a short wavelength (the wavelength is usually below 450nm), relatively high energy, and strong penetration.

When such blue light passes through our eyes, the lens in the eye will attract some of the blue light (and the lens will gradually become cloudy to form cataracts). However, most of the blue light can still penetrate the lens to the macular area on the retina, causing damage to the visual cells of the macular lesion. This damage is irreversible, so there is a saying on the Internet that "blue light hurts the eyes".

And this damage is the most harmful to children, children's lenses are clearer, blue light is easier to penetrate. Therefore, parents should pay attention to the time that children use electronic devices, and try to avoid looking at mobile phones and tablets for a long time (almost all tablet computers, including iPads, are LCD screens)

About the eye protection mode of the LCD screen

The function of eye protection mode is to achieve the purpose of eye protection by weakening or filtering out the blue light in this part of the band. After turning on the eye protection mode, the screen will turn yellow all of a sudden, because after the lack of blue light, red + green = yellow, so the screen appears yellow.

Turning on eye protection mode is indeed helpful to filter blue light. However, the data proves that the eye protection mode of different brands of mobile phones is not consistent in the filtering rate of blue light. The blue light filtering rate in the eye protection mode of some brands of mobile phones is actually not ideal.

And the yellowish degree of the eye protection mode screen is also inconsistent, and not everyone can accept such a yellowish screen. Therefore, the author believes that playing less for a while mobile phone has a better effect on the eyes than the eye protection mode

Blue light hazards are not only present in phone screens:

In fact, as long as blue LED mixed with yellow phosphor is used to form white light, there is blue light hazard, computer monitors, fluorescent lamps, mobile phones, digital products, displays, LEDs and other light have short-wave blue light. But what we usually stare at the most with our eyes is the computer screen and mobile phone screen, and the time is long and close. So the loss of such devices to our eyes is the greatest.

Shortwave blue light can not only harm our eyes

All short-wave blue light can also affect sleep. The human body inhibits the secretion of melatonin under the irradiation of blue light, and melatonin is an important hormone that affects sleep, and its currently known role is to promote sleep and regulate jet lag. Of course, this is off topic.

OLED screen – strobe damage

Compared to LCD screens, OLED displays use a design of independent pixel self-illumination and do not require a backlight. So the amount of blue light is much less. And the blue light band produced by the OLED display is mainly concentrated at 460nm, the energy is relatively small, and the damage to the human eye is much less. At least in the current data, the blue light of OLED screens does not pose a hazard to the human eye.

But this does not mean that you can buy an OLED screen mobile phone can be worry-free, in fact, OLED screens also have their fatal flaws - strobe problems.

Since the screen needs to control the brightness. For LCDs, we can directly control the brightness by adjusting the voltage of the backlight layer, and OLED will have uneven chromatic aberration (jelly effect) at low voltage, which has been plaguing early OLED screens. But then OLED manufacturers solved this problem with low flicker. The principle of this technology is to reduce the brightness by reducing the switching frequency of the OLED screen light source.