LCD liquid crystal display module parameters and maintenance points

- Jun 22, 2018-

                   

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As we all know, the liquid crystal display has the advantages of environmental protection, low energy consumption, no noise generation, low heat generation, etc. It is also the most important accessory in the computer. Mastering the parameters of the liquid crystal display module can effectively help us to correctly understand the performance of the liquid crystal display. This will provide the basis for future use and maintenance. This article today for everyone to share some of the liquid crystal display module technical indicators, and then gives the daily maintenance of liquid crystal display points for reference, reference.


1. Specifications of LCD module


The most important parameters of the LCD module include:


1.1 resolution


Resolution is a very important performance indicator. It refers to the number of points that can be displayed on the screen in both the horizontal and vertical directions (the lines and the planes on the screen are all composed of dots). The higher the resolution, the more information that can be accommodated in the same screen. For a CRT that can support 1280x1024 resolution, whether it is 320x240 or 1280x1024 resolution, can be more perfectly demonstrated (because the electron beam can do elastic adjustment). But its maximum resolution may not be the most appropriate resolution, because if the 17-inch display to 1280x1024 resolution, WINDOWS fonts will be small, over time, it will easily fatigue, so the best resolution of 17-inch display Should be 1024x768.


1.2 Contrast


The control ICs, filters, and orientation films used in the manufacture of LCD panels are related to the contrast of the panel. For the average user, a contrast ratio of 350:1 is sufficient, but this level of contrast cannot be achieved in professional fields. Meet the needs of users. Compared to CRT displays, it is easy to achieve a contrast ratio of 500:1 or higher. Only high-end LCD monitors can reach this level, because contrast is difficult to measure accurately through the instrument, so when it comes to picking, you still have to see for yourself.


1.3 Brightness


Liquid crystal is a substance that is between the solid and the liquid. It cannot light itself, and it requires the use of an extra light source. (160128) Therefore, the number of lamps is related to the brightness of the LCD. The earliest LCD monitors only had two tubes, one for the upper and the lower, and four lamps for the most popular type. Six lamps were used for the high-end models. The four lamp designs are divided into three types: one is that each of the four sides has one lamp, but the disadvantage is that a dark shadow appears in the middle. The solution is to arrange the four lamps from top to bottom. The last is the "U" type of display, which is actually the two lamps produced by the two lights in disguise. The six-tube design actually uses three lamps. The manufacturer bends all three lamps into a “U” shape and places them in parallel to achieve the effect of six lamps.


LCD LCD module customization


1.4 viewing angle


The viewing angle of the liquid crystal is a headache. After the backlight passes through the polarizer, the liquid crystal, and the alignment layer, the output light has directionality. In other words, most of the light is emitted vertically from the screen, so when viewing a liquid crystal display from a relatively large angle, you cannot see the original color, and you can only see it completely white or black. In order to solve this problem, manufacturers have also started to develop wide-angle technology. So far there are three more popular technologies: TN+FILM, IPS (IN-PLANE-SWITCHING) and MVA (MULTI-DOMAIN VERTICAL alignMENT).


1.5 signal response time


The response time refers to the response speed of the liquid crystal display to the input signal, that is, the response time of the liquid crystal from dark to bright or from bright to dark, usually in milliseconds (ms). To clarify this, we must also talk about human perception of dynamic images. The human eye has the phenomenon of “visual residue”, and the high-speed motion picture will form a short-term impression in the human brain. The latest games, such as cartoons and movies, have been applied to the principle of visual remnants, allowing a series of gradient images to be displayed in rapid succession in front of the human eye, forming a dynamic image. People can accept the screen display speed is generally 24 per second, which is the origin of the movie 24 frames per second playback speed, if the display speed is lower than this standard, people will obviously feel the screen pauses and discomfort. According to this index calculation, the time for each picture needs to be less than 40ms. In this way, the response time is 40ms for a liquid crystal display, which becomes a hurdle. If the display is lower than 40ms, there will be obvious “tailing” or “residual”. The phenomenon of "shadow" makes people feel chaotic. If you want to achieve a smooth image, you need to achieve a speed of 60 frames per second.


LCD screen


2. The routine maintenance of the LCD monitor


Although the performance of a liquid crystal display is stable, we cannot ignore its maintenance. Because the maintenance of the monitor is not properly watched, the reliability and service life of the display may be greatly shortened. The following shows the daily maintenance points of the LCD monitor summarized in this article.


2.1 Avoid Burning the Screen Internally


Remember, CRT monitors can burn out because of long-term work, as do LCDs. Therefore, it must be remembered that if you do not use it, be sure to turn off the monitor, or reduce the monitor display brightness, otherwise a long time, it will lead to internal burnout or aging. Once this damage occurs it is permanent and cannot be recovered. Therefore, we must pay enough attention to it. In addition, if a fixed content is continuously displayed for a long period of time, it may cause some LCD pixels to overheat, resulting in internal burnout.


In order to avoid such internal burnout, the following measures can be taken when not in use:


1) Turn off the monitor when it's okay.


2) often change the display content on the screen at different time intervals (such as running a screen saver);


3) Reduce the brightness of the display to a darker level;


4) Display a completely white screen content.


2.2 Maintaining the Humidity of the Environment


All users who have damaged the keyboard due to spilling the drink on the keyboard know this common sense. Do not allow anything with moisture properties to enter the LCD. If you notice any fog, wipe it off with a soft cloth before you turn on the power. If moisture has entered the LCD, the LCD must be placed in a warm and dry place in order to allow the moisture and organics to evaporate. Applying electricity to a humidity-containing LCD can cause corrosion of the liquid crystal electrode and cause permanent damage.


2.3 Correctly clean the display surface


If you find that the display surface is smeared, gently wipe it off with a soft cloth dampened with a little glass cleaner. Do not spray the cleaner directly on the surface of the display. Cleaning agent entering the LCD will cause a short circuit on the screen.


2.4 Avoid unnecessary vibration


The LCD screen is very fragile, so avoid strong shocks and vibrations. The LCD is almost the most sensitive electrical device in the user's home or office. The LCD contains a lot of glass and sensitive electrical components. Dropping to the floor or other similar strong streak can cause damage to the LCD screen and CFL unit. Also be careful not to apply pressure to the LCD display surface.


2.5 Do not disassemble the monitor


One rule is that you should never disassemble the LCD. Even after a long period of shut down, the CFL inverter in the backlight assembly may still have a high voltage of about 1000V. This high voltage can cause serious personal injury. So never try to disassemble or change the LCD display to avoid high voltage. Unauthorized repairs and changes can cause the display to temporarily or permanently stop working.


LCD LCD module manufacturers


2.6 degaussing the monitor


Due to the presence of electromagnetic fields inside the display, if there are wireless communication devices close to the display, such as mobile phones, BP machines, cordless phones, they will cause the display to produce a magnetization reaction, thereby affecting the display of the display. If you are using a digitally controlled display, you can directly use its built-in degaussing function to degauss.


2.7 LCD Screen Cleaning


LCD monitors have been used for a long time, the screen will be dirty and become a big face, what to do? The correct cleaning method is to use a soft cloth stained with a little glass cleaner to carefully wipe off the stain (there is no detergent on the water Let's do it. The intensity of the wipe should be light, otherwise the monitor screen will be short-circuited and damaged. Never allow water to flow into the interface between the screen and the screen frame during this process, so as to avoid short circuit burnout of the monitor. Do not scrub the surface of the screen with a hard towel to avoid scratching the screen surface and affecting the display. Cleaning the display also requires regular quantification, and frequent scrubbing is also wrong, as it will also cause some adverse effects on the display.


2.8 Put an end to some bad habits


The biggest bad habit is that you often point your finger at the screen. The LCD monitor is very delicate. A few thousand display shouldn't move her casually. In general, LCD monitors are relatively light and accidentally knocked over. This is not a joke. It is also worth noting that the power consumption of the liquid crystal display is relatively small, but the voltage of the transformer behind the liquid crystal display is still very high; to pay special attention to safety, do not open the back cover of the monitor under power. Even after the power is turned off, the transient voltage that remains is quite high, and the CFL transformer in the backlight assembly still has a high voltage of about 1000V. In a liquid crystal display, the only part that will gradually be consumed is the monitor's backlight. After long-term use, you may find that the screen is no longer bright, or simply dark, this is not a serious problem, just change a new background light on it.