For a long time, everyone has been arguing about which AMOLED screen or LCD screen is more eye-catching. According to the current development pattern of the industry, the popularization of OLED screens is a major trend. After all, OLED screens are also used on Apple iPhones.
For the upcoming Meizu 16 series, this phone also uses AMOLED screens. Regarding the issue of whether it hurts the eyes, Huang Zhang also personally went to the science popularization. He believes that the light source of both LCD and OLED screens is from LED, and blue light is The same exists, so there will be eye injuries. All you have to do is turn on the eye protection mode on your phone. Will AMOLED screens really hurt your eyes than LCD screens? Let's discuss briefly.
As a screen composed of self-luminous organic materials, AMOLED screens need a separate backlight like LCD screens. When the current passes through the organic materials, the pixels will emit light by themselves, so it can make the screen bigger and thinner, and it can save more on black background. Electricity and higher contrast are its advantages, but PWM low-frequency dimming is indeed a lingering pain.
What is PWM low frequency dimming?
Description of Samsung AMOLED official website
PWM low-frequency dimming is a dimming technology that uses simple digital pulses to repeatedly switch white LED drivers. Compared with LCD screens that use DC dimming, AMOLED manufacturers generally use PWM low-frequency dimming, while DC dimming is The biggest problem with the technology of directly controlling the current on both sides of the light-emitting component to adjust the brightness is that in an extremely low-brightness state, DC dimming will cause an inevitable color cast.
In the early days, the AMOLED screen used DC dimming, but because of the brightness, the famous "wiping screen" appeared in the industry. Samsung Galaxy S, S2, and Note are all experimental products. It is also after these experiments that I switched to PWM low-frequency dimming. As the frequency of the switching light source accelerates, the screen flicker will also increase. When you can't observe the changes with the naked eye, you will see a stable The brightness is displayed, so the color cast problem of the AMOLED screen is solved.
After all, PWM dimming is also a technology that adjusts brightness through fast flashing. Although the flashing rhythm is fast, the brain can still give feedback from this phenomenon. So if you feel this flashing for a long time, it will inevitably Intensify the fatigue of the muscles on both sides of the eyes, thereby stimulating the linkage of the refractive system and accelerating the aging of vision.
Who hurts the eyes more?
In fact, the question of which one of AMOLED screen or LCD screen hurts the eyes is basically clear. As Huang Zhang said, although the two screens use different light technology, they will both cause damage to the eyes. If PWM low-frequency dimming is the main culprit of AMLED screens that hurt eyes, then LCD screens with DC dimming also have an irreversible impact on eyesight, because you cannot ignore the blue light hazards.
To make mobile devices less harmful to the eyes, the main points are as follows:
1. Try to avoid looking at the phone screen for a long time;
2. Reduce the low-brightness viewing time of LCD and AMOLED in a dark environment, and be sure to turn on the lighting equipment when necessary;
3. Reduce the dryness of the eyes, and remove eye drops once it appears;
If you want to really solve the problem that the mobile phone screen does not hurt your eyes, the best way is not to look at or use the mobile phone. This is probably too difficult.
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