When using a desktop computer, many people like to use screen savers. When they switch to a laptop, this good habit is preserved, but they don't know the screen saver. Not only does the laptop have no benefits, but it also has some negative effects. In fact, the screen saver only protects the CRT display using a graphical interface operating system (such as Windows), but since the LCD screen and CRT display used in the notebook work differently, the screen saver can only Help me down. The role of screen saver on the display The principle of CRT (cathode ray tube) display is mainly to heat the cathode by the filament, the cathode emits electrons, and then, under the action of the accelerating electric field, the focused electrode is concentrated into a very fine electron beam at the anode high voltage. Under the action, the huge energy is obtained, and the phosphor layer is bombarded at a very high speed. The target of these electron beam bombardments is the three primary colors on the screen. To this end, the electron beam emitted by the electron gun is not a bundle, but three bundles, which are respectively controlled by the voltages of the three primary color video signals of the computer graphics cards R, G, and B, to bombard the respective phosphor units, thereby displaying on the display screen. A complete image. In the operating system of the graphical interface, the colors displayed on the display screen are various. When the user stops operating the computer, the screen display will always be fixed on the same screen, that is, the electron beam will bombard the same area of the fluorescent layer for a long time. If it goes on for a long time, the screen will age due to the fatigue effect of the fluorescent layer of the display screen, and even the picture tube will be broken down. Therefore, from the era of Windows 3.X, the screen saver has been the best helper to protect the CRT display. Through the changing graphic display, the fixed points on the fluorescent layer will not be bombarded for a long time, thus avoiding the damage of the screen. The screen saver damages the LCD monitor. The LCD (Liquid Crystal Display), the liquid crystal display, has a core structure similar to a “sandwich” sandwich. The two glass substrates are filled with moving liquid crystal molecules. The signal voltage directly controls the switching state of the thin film crystal, and then the liquid crystal molecules are controlled by the transistor. The liquid crystal molecules have obvious optical anisotropy, and can modulate the light emitted from the backlight tube to realize image display. A complete display consists of a number of pixels, each of which looks like a transistor that can be switched. This will control the resolution of the display. If an LCD has a resolution of 1024 x 768 (XGA), it represents both 1024 x 768 pixels for display. Therefore, the working principle of the LCD can also explain the problems that many people will ask, such as why the optimal resolution of the LCD is fixed, and why the refresh frequency of the LCD is only 60 Hz. From the above working principle of LCD, we can see that an LCD that is displaying images has its liquid crystal molecules always in the working state of the switch. For an LCD with a response time of 20ms, the liquid crystal molecules have been switched. A few hundred times or so. The number of switching of liquid crystal molecules is naturally limited by the life, and the aging phenomenon of the LCD will appear, such as dead pixels. Therefore, when we stop the operation of the computer, the screen saver that displays the colorful repetitive motion on the screen undoubtedly makes the liquid crystal molecules still in the repeated switching state. Different monitors have different maintenance methods. Screen protection has an impact on the battery. Nowadays, more screen saver makers have paid too much attention to the expressiveness of images and the change of color. The screen saver has been completely made as an animation. Even 3D instant processing animations require the processing of graphics processors, so many beautiful and bulky screen savers come into being. Such screen savers can give viewers a visual enjoyment, but this It is a cumbersome thing for the hardware inside the computer, which is a serious departure from the original intention of the screen saver to let the computer hardware rest. Due to the need to cope with ever-changing screens with richly detailed color screens, the CPU, hard drive and graphics card workloads may be higher than usual applications. For laptops that sometimes use battery power, this is the time. The screen saver has undoubtedly become a power killer. Therefore, when you may leave your laptop for a while, especially when using battery power, turning off the LCD is the only correct way. Of course, how to close it, you have a variety of ways to achieve it. The most direct way is to turn off your laptop, which is the most power-saving method. Of course, you may just leave 10-15 minutes. Restarting may be very impatient, and you can also buckle the screen. When the system will automatically close the screen to enter the standby state, and then let the notebook back to work, you need to pick up the screen. In addition, the IBM laptop provides a shortcut key to close the screen. As long as the HotKey driver is properly installed, the screen can be temporarily turned off by the FN+F3 key combination, and any key can be pressed to re-light the screen. Of course, not all laptops can turn off the screen separately, but almost all laptops provide shortcuts to turn off the backlight. Since the light from the LCD screen comes from the backlight, it works for a long time. Naturally, it will age. Since you can't directly turn off the screen, you can't let the screen saver dry the lamp. If you're not sure how long you have to leave, the work of turning off the screen can be done by handing it to Windows. You can set how long it takes to shut down the screen and the computer after losing control of the computer in the power manager. Don't be confused by beautiful screen protection, in order to better protect your LCD, please keep them away from your laptop!