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Select LCD panel to start from pick panel
With more and more smart city construction and informatization projects, large flat panel splicing screens (MPDP plasma splicing screens, MLCD splicing screens) are becoming more and more popular as display terminals. In addition to the seams of LCD splicing screens, it is a key selection element. One, 7 * 24 hours of continuous work time, but also requires a set of LCD splicing screen quality must look at the quality of its panel itself, due to the quality of the panel directly affects the viewing effect and life of the screen, and LCD splicing screen The panel accounted for more than 2/3 of the cost of the whole machine, which is an important factor affecting the cost. Therefore, to choose a good LCD splicing screen, the first must choose its panel. Many users will pay special attention to what kind of panels are used in the splicing screen when purchasing, and many users will superstition the splicing screen panels when they purchase splicing screens, thinking that the LCD panel determines everything on the splicing screen.
Many people think that the Sharp screen in the LCD panel field and the Samsung screen are synonymous with good image quality, while the domestic and Taiwanese system panels are rubbish. This idea is also incorrect. First, we must understand that, in addition to common TN panels, MVA and PVA and other VA class panels, IPS panels and CPA panels, there are driver ICs and circuits, as well as filters, polarizers, and polarizers. , backlight system, etc. more than a dozen formed part, the pros and cons of these parts will also affect the quality of the final function of the panel.
A, LCD panel composition
In brief, the liquid crystal panel can be regarded as a layer of liquid crystal sandwiched between two glass substrates, the upper glass substrate is matched with the color filter, and the lower glass is embedded with the electric crystal. When the current passes through the transistor and the electric field changes, liquid crystal molecules are deflected to change the polarity of the light, and then the polarizer is used to determine the light and dark state of the pixel.
Second, thin film transistor LCD splicing module
It sounds like it's easier, but because of the complexity of the manufacturing process, the investment in the manufacturing line is huge (the cost of a high-generation line is above 10 billion RMB), there are many patent restrictions, and it also requires a glass substrate (conductive glass) , polarizers, color filters, backlights, etc., supporting materials are the constraints of alignment agents, sealing adhesives, and gasket data, and there are very few manufacturers that have the ability to manufacture LCD panels. The biggest one at this stage is the Korean system. Samsung, LGD, and Taiwan’s AUO and Chi Mei.
So to see which splicing screen application panel, the most intuitive mode is to enter the factory form menu, but along with the recent touch OSD menu popular, more and more splicing screen does not provide factory menu options, the author here to provide a Absolutely simple identification method. Due to the different panel manufacturing lines applied by various panel manufacturers, there are five generations, six generations, seven generations, and even higher specifications. The most economical panel sizes are not consistent, resulting in the formation of screens of various sizes on the market at this stage. A hundred flowers bloom.
Third, LED splicing screen is not LED panel
The correct full name of the LED splicing screen is a liquid crystal splicing screen using an LED-backlit LCD panel. Since the liquid crystal of the LCD does not emit light itself, it is necessary to attach an extra light source to reach the display performance. The traditional LCD panel application is the CCFL backlight module. At this stage, a few of the latest LCD panels begin to use LED backlight modules. For this reason, the so-called LED backlight splicing screen is also a liquid crystal splicing screen, but only the backlight portion of the liquid crystal panel made a definite change.
The difference is only the word "backlight", one for the LED panel, the other for the LCD panel, the product is relatively different. Although some large manufacturers are delaying the channeling, they are LED splicing screens, but in fact, at this stage of technology, whether the display effect of a real LED splicing screen can be stronger than the LCD splicing screen is still a big problem. .
Fourth, look at the three types of LCD panel
At this stage, the mainstream LCD panels can be classified into three categories from the general category: they are IPS, VA, and TN, in which TN panels occupy 80% of the market share. However, from the perspective of the development of the splicing screen, with the increasing demand for splicing screen functions, the wide viewing angle splicing screen represented by IPS and VA will have great development. Below, the author will introduce one by one for everyone.
1. IPS panel: It is also a wide viewing angle panel, with a large viewing angle, fast response speed (compared to VA panel splicing screen), and accurate tone reproduction. Compared with other types of panels, the screen of the IPS panel is relatively “hardâ€, and the water pattern distortion is not easy to occur with the hands neatly and neatly. This is also called a hard screen.
At this stage, the wide-angle splicing screen of the IPS panel in the market is still relatively high. Of course, the same is the IPS panel. There are some differences. The high-end models use the native top-level S-IPS panel to maintain a wide viewing angle. All the advantages, at the same time, the color tone is also quite accurate; while the low-cost wide-angle viewing camp represented by AOC and LG is the application of a shrinking e-IPS panel (LGD did not recognize this name), and the streamlining of the wide color The products such as the domain and the internal control circuit have been kept at a very low price while keeping many personalities of a wide viewing angle, and the color tone is also better than most TN screen splicing screens, and it is still worth purchasing.
2. VA panel: It belongs to the wide viewing angle panel.
Compared with the TN panel, the 8bit panel can provide 16.7M tone and large viewing angle is the high-end capital of this type of panel positioning. VA class panels can be further divided into MVA panels dominated by Fujitsu and PVA panels developed by Samsung. The latter is the inheritance and improvement of the former, and is the most applied type in the market at the present stage.
3, TN panel: The full name is TwistedNematic (twisted nematic type) panel, it is important for entry-level and middle-end liquid crystal display unit, it is also the most common panel type in the market at this stage. The TN panels we see at this stage are mostly improved TN+film. The film is the compensation film, which is used to make up for the lack of viewing angle of the TN panel. The visible angle of the improved TN panel at this stage has reached 160°.
TN screen splicing screen is relatively mainstream in the market because of its low price and low power consumption. More than 90% of the models use TN panels. Coupled with the hottest LED backlighting and 3D performance at this stage, the TN panel splicing screens launched by many brands at the present stage have been greatly improved in terms of viewing angle, and have been different from the wide viewing angle splicing screen. Very small, I believe that in the future for a long time TN screen splicing screen is still relatively mainstream in the market.