Recently, many netizens have sent private letters asking the author about MX2 and iPhone5 The problem of light leakage on the screen is very worrying about the impact of this screen defect on daily use. Today, let's analyze the problem of light leakage on the screen, first investigate its causes, and then discuss its impact.

In brief, the basic principle of screen display is to fill liquid crystal material between two parallel plates, and change the arrangement of molecules in the liquid crystal material through voltage to achieve the purpose of shading and transmitting light to display images of different depths and well arranged. In addition, as long as a ternary color filter layer is added between the two plates, color images can be displayed.

Since liquid crystal molecules cannot emit light themselves, if you want to appear a picture, the liquid crystal screen needs a special light source to provide light, and then through the deflection of liquid crystal molecules to produce different colors. The backlight plays the role of providing light energy. Previously, the LCD screen used a cold cathode ray tube called CCFL, whose luminous principle is almost the same as that of fluorescent lamps. Now, the new LCD screen uses a more energy-saving and long-life LED backlight. After the lamp tube (or LED) emits light, the light is distributed everywhere through the light guide plate, and all the light directions are concentrated towards the liquid crystal molecules through the reflective plate on the back. Finally, the light is evenly distributed through the Prism sheet and the diffuser to avoid the situation that the central brightness is too high and the surrounding brightness is too low.

iPhone5 If you tilt the phone at a certain angle, you can see that there will be light leaking through the frame gap. Where does the light come from? It is actually emitted by the backlight of the screen, and iPhone5 There is a certain fit tolerance between the power key of the iPhone and the phone frame, which leads to the occurrence of "light leakage". In fact, if the LCD screen of the iPhone 5 is tight enough when packaging or the fit tolerance between the key and the phone frame is small enough, this phenomenon will not occur. However, the author personally feels that this slight light leakage will not affect the use of the iPhone 5, It's not a quality problem. At most, I can only give iPhone5 Put on an "imperfect" hat.