Large screen splicing system
At present, the more common large-screen splicing systems are usually divided into three main types according to the working mode of the display unit, namely LCD display unit splicing, PDP display unit splicing and DLP rear projection display unit splicing. The first two belong to flat panel display unit splicing systems, and the latter belongs to projection unit splicing systems.
Plasma large screen splicing system
PDP (Plasma Display Panel) is a plasma display screen. PDP is a display technology that uses gas discharge, and its working principle is very similar to that of fluorescent lamps. It uses plasma tubes as light-emitting elements. Each plasma tube on the screen corresponds to a pixel. The screen uses glass as a substrate, and the substrates are spaced a certain distance apart to form discharge spaces. The discharge space is filled with mixed inert gases such as neon and xenon as the working medium, and a metal oxide conductive film is coated on the inner side of the two glass substrates as an excitation electrode. When voltage is applied to the electrodes, the mixed gas in the discharge space undergoes plasma discharge, also known as the plasma effect. Plasma discharge generates ultraviolet rays, which excite the fluorescent screen coated with red, green and blue phosphors, and the fluorescent screen emits visible light to show an image.
PDP unit splicing has the advantages of bright colors, high contrast and high brightness, but it also has its own shortcomings that cannot be overcome. Plasma has a large power consumption and heat generation, which will cause serious burns and is not suitable for long-term static image display monitoring. And after the PDP unit is used for splicing, the temperature of the whole machine will rise higher, making the equipment easy to burn. In addition, the price of plasma splicing curtain wall on the market is relatively high, generally the price per square meter is as high as hundreds of thousands. Today, low carbon and energy saving have become the mainstream trend. For most ordinary users, plasma splicing is obviously not the best choice.
Despite its many shortcomings, the bright colors and high brightness of plasma make its picture display effect have outstanding advantages, which makes plasma splicing a favorite of some exhibitions and display activities. In addition, plasma is also the first choice for government agencies that have high requirements for picture quality. However, in terms of the overall market share, plasma splicing is at a complete disadvantage, and in terms of the development trend of the entire industry, the development potential of plasma splicing is limited. According to the analysis of some industry insiders, the industry is currently a "chicken rib industry" and will definitely be replaced in the future.
LCD splicing
The so-called LCD large screen splicing is a splicing screen that uses LCD display units to splice and uses a splicing control software system to achieve a large screen display effect. LCD splicing is currently represented by DID of Samsung in South Korea. Although there are other brands such as SHARP, LG, and NEC in the splicing market, DID stands out in LCD flat panel splicing technology with its excellent cost performance.
LCD splicing has the advantages of thin thickness, light weight, low energy consumption, long life, no radiation, etc., and its fine picture, high resolution, and excellent performance of various key performance indicators have made it the mainstream of development and promising prospects. As a splicing display terminal, although LCD has the above advantages, as a splicing display unit, its disadvantage is also fatal: that is, its splicing seam is currently large, and it is the largest among the three splicing display units, so many users have to give it up reluctantly.
DLP splicing system
DLP is the abbreviation of "Digital Lighting Progress". It means digital light processing, which means that this technology must first digitally process the image signal and then project the light. Specifically, DLP projection technology uses a digital micromirror chip (DMD) as the main key component to realize the digital optical processing process. The principle is to use an integrator to homogenize the light, and through a color wheel with three primary colors, divide the light into three colors of R, G, and B, and then image the color on the DMD through the lens. Using the synchronous signal method, the electrical signal of the digital rotating lens converts the continuous light into grayscale, and the color is displayed by combining the three colors of R, G, and B, and finally the image is projected through the lens.
The DLP large-screen splicing system is mainly composed of DLP projectors and image processors to form a high-brightness, high-resolution, and realistic-color TV wall. It can display various computer, network, and video signals, and the images can be roamed, opened, zoomed in and out, and superimposed at will. In addition, compared with other splicing technologies, the outstanding advantage of DLP splicing is "zero gaps", and its physical gaps have a good overall display effect. Moreover, the DLP splicing system has low requirements for the environment, which reduces the operating cost.
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