Some friends will add some extra money when they buy computer monitors in the computer city and ask that the screens they buy back be perfect. In fact, the bad points and bright spots are quite common, but they are usually difficult to find when we use them. Some people with sharp eyes and pursuit of perfection will have high requirements for the screen, so they will be willing to spend more money to buy a perfect screen. But in fact, the bad points are not unique to computer monitors. Where there is a LCD screen, there will be bad points. Our mobile phones are no exception.
Some time ago, a friend went to buy a MX2, but the RP was not good. After returning to Shenzhen, he found that there were several highlights on the original screen. Then he ran back to Hong Kong the same day. However, due to language difficulties, he changed his mobile phone after several twists and turns. In fact, it's a good idea to replace it. If it happens in the mainland, it's estimated that no one will pay attention to you for half a month.
Generally, the default wallpaper of our mobile phones is very beautiful, so these bad spots will be hidden in them. In addition, because the pixels of mobile phones are smaller than those of the display, it is more difficult to find the bad spots of mobile phones.
The bad spots can be roughly divided into two categories. The dark spots can not display the content no matter how the screen display changes " Black spot " , because it does not emit light, it is generally the most difficult to find. The most annoying thing is the bright spots on the screen, especially in the black background. The bright spots are like stars in the night sky.
Under the magnifying glass, we can find that the display screen is actually composed of one small grid, and each small grid is a pixel. Each pixel is composed of three sub pixels: red, green, blue and blue. The combination of these three colors can make the pixel produce a variety of colors. In addition, a driving tube is integrated behind each sub pixel to drive the pixel. If these driving tubes are broken, bad points will appear. How many sub pixels are there on the 720P phone screen? 1280 * 720 * 3=2764800, or nearly 2.8 million! It is conceivable that it is very difficult to think that none of these millions of sub pixels is bad.
Because these bad points are generated in the production process, it is basically impossible to repair them, so more often we can only fight for character. At present, the country has only issued testing standards for mobile phones, and no specific standards have been issued for the testing of components. It is difficult to standardize management, and more mobile phone enterprises mostly follow the standards of LCD monitors. If the screen is no more than three bad spots, it is not a product quality problem. So if your screen is no more than three bad spots, you will not be able to replace it.
The principle of detecting whether there is a bad spot on the screen is the same as that of detecting the display. Generally, we will carry out visual inspection through the red, green, blue, black, and white solid color images. As long as there is a difference between the image and the solid color during the detection process, we can consider it as a bad spot.
However, if there are not too many bad points, we don't need to be so concerned, because we said at the beginning of the article that such bad points are not obvious. More often, the more carefully we check, the more we will pay attention to it in the future. Usually, we will always stare at the bad points, and the tangled days will begin from here...
