Looking at all the information on the Internet and all kinds of statements, Tony felt that he should go into the water and test it himself to see what was going on. < / P > < p > unlike LCD screen which needs backlight, OLED can self light, and each display unit can generate red, green and blue lights under control. However, it also brings many disadvantages, such as the long-term playing of the screen may produce brand marks, in some extreme cases, there are screen color deviation, curved surface color deviation and so on. < / P > < p > under low voltage, that is, under the darkest brightness, the luminance difference of each pixel of OLED screen will be magnified, resulting in uneven or inaccurate color rendering. < / P > < p > as early as 2018, Huawei mate 20pro had a green screen door. At that time, netizens speculated that there was something wrong with LG’s screen. < / P > < p > Tony saw many people say that in addition to the wechat “shake” page, you can also use pure black images to test, to practice.. < / P > < p > although it is extremely black, Apple users should still be able to “see” the phone when they see the auxiliary touch ball at the bottom. < / P > < p > as just mentioned, OLED is self luminous, and each pixel is independent, so the principle of OLED black display is: directly make the pixels in the black area not bright. < / P > < p > about the green screen, I feel that it is almost enough to talk about it. I think we must be very curious. After so much talk, will such a green screen affect our daily life? < / P > < p > first of all, if you’re the guy at the beginning of the article with a split green, don’t hesitate, you’re really bad! Go and exchange it… < / P > < p > in addition, if you use it normally, for example, when you turn off the lights at night and play with your mobile phone in the dark environment, it is worth rescuing. < / P > < p > but if you’re just like Tony’s colleagues, in a dark environment, turning down the brightness to the minimum is the green screen, then there’s no need to worry too much. < / P > < p > the following mobile phone is the iPhone 11 pro with green screen just now. Tony photographed its performance under the darkest brightness and under the normal brightness. The problem caused by the color deviation of OLED is caused by the color deviation of OLED. Manufacturers can indeed adjust the power supply level of each pixel color through system and other level updates, so as to alleviate this problem. < / P > < p > if it can’t be solved, we can see what kind of solution Apple will give, whether to recall the machines with problems or to take other solutions. Continue Readinggather and watch! Huawei P40 Pro evaluation: excellent mobile phone photography elegant design, do you like it?