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    As an Apple fan, I want to say: screen flash from the OLED screen and blue ray from the LCD screen,

    Date: 2020-01-16
    Views: 11

    The article about OLED and LCD I posted before caused a big discussion. Some people think that the OLED screen flash hurts the eyes, while others think that the high blue-ray of the LCD hurts the eyes more. So which one hurts less?

    This problem is difficult to decide what hurts less. In fact, various visual discomforts are caused by many reasons. Moreover, the sensitivity of everyone's eyes is different, which makes this problem is always between the people who make decisions based on the people who make decisions according to their experiences and the people who make decisions based on experiments.

    Here we mainly answer the question in two aspects of blue light and screen flash.

    First, for blue lights. It’s no doubt that blue lights is dangerous. According to the standards jointly developed by the IEC and the European Standards Committee, the damage of blue light to the retina is 10 times that of red and yellow light! The most important parameters of the screen backlight and the blue light ratio is the color temperature. Due to the different light-emitting principles of the OLED screen and the LCD screen, the LCD screen does cause more blue light damage than the OLED screen, but we can effectively reduce the blue light by changing the external conditions, such as adjusting color temperature or using with anti-blue ray glasses.

    As an Apple fan, I want to say: screen flash from the OLED screen and blue ray from the LCD screen,

    While for the screen flash, the higher the screen flash frequency, the better, because with the higher frequency, people will far less feel the stroke, and it doesn't seem to have screen flash. Here is a point that was not mentioned before. Under DC dimming, the color distribution of low-brightness OLED screens is very uneven, so PWM dimming is adopted. According to an IEEE standard for the lamp flickers, the frequency of the flashing range should be above 1250HZ, and greater than 3125HZ is exempted from the assessment and it is considered that it has no flicker. However,  for the currently popular models, the flashing frequency of many OLED screens is still relatively low, like the iPhone XS Max is the only 240HZ.

    As an Apple fan, I want to say: screen flash from the OLED screen and blue ray from the LCD screen,

    Here is the problem. Blue-ray is a controllable factor at present, while the flash is easy to cause damage to the sensitive eyes. It’s the fact that even in the LCD screens, there are relatively poor strobe frequencies. For example, the iPhone XR that I am using has a strobe frequency of more than 9K HZ, while the other popular brand, the frequency of  Honor Play is the only 83.3HZ! Moreover, in low brightness conditions, many LCD screens also use PWM dimming.

    At the same time, since 19 years ago, OLED screens have gradually adopted DC dimming or a similar dimming to eliminate flash. For example, Huawei P30 has introduced an eye protection mode called DC dimming mode, which can effectively prevent flash.

    But for the current level of screen technology, we must understand the fact that the flash situation of OLED screens is generally more serious than that of LCD screens. I also said before that LCD screens are currently relatively a good choice for me. Of course, playing phones for less time is the right way to protect your eyes.

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