First, the function introduced Large-screen splicing technology is generally applied to large-scale command center systems and multi-party telepresence conferences. The basic functional requirements of the large current large-screen video wall are: a large screen is displayed on the curtain wall; the network is roamed and the images are superimposed; any number of stitches are formed on a large screen; multiple signal input displays. Second, the system composition Since it is splicing, of course, splicing the curtain wall, in order to achieve a variety of signal switching, the matrix is ​​also essential. Nowadays, it is generally used to use remote multi-party conferences. The command system is convenient for operation. It will also join the central control system to control the wall, matrix, and conference terminals. Third, the type of curtain wall 1, rear projection mosaic wall The technical principle of DLP is very simple. A projector is set inside the rear projection unit. The image sent by the lens is enlarged and reflected by the lens and projected onto the back of the screen. This is the rear projection. DLP splicing curtain wall itself is categorized into numerous types, and various technical terms emerge one after another, but in summary, its outstanding feature is that the unit size is large, the technology is relatively mature, and the splicing seam is small; its main disadvantage is large volume, short life span, and the picture quality is not high. . 2. Plasma curtain wall When PDP plasma is used as a home for displaying dynamic images, it has been praised by many users due to features such as high brightness, high contrast, high color gamut, and wide viewing angle in the early stage of use, but it has been applied in the field of security protection or requires the display of static images for a long time. At the time of text and graphics, for example, used as a monitor or spliced ​​into a television curtain wall, there are serious drawbacks: the display of static images is likely to produce ghosting or even burn-in, that is, so-called plasma imprinting, rapid decay of brightness, and occurrence of imprinting or After the brightness is reduced, it cannot be recovered; the reliability is low, and the power consumption is higher than other technologies. Currently, 42" screens have been specially used for splicing, and their borders are about 5mm apart, but the price is relatively expensive. Under the current state of the art, the disadvantages that cannot be overcome by the PDP seriously hinder its application in the commercial large-screen display market. . 3, LCD mosaic wall Liquid crystal is the most high-end and most ideal display device today, and its excellent performance has been widely recognized. The liquid crystal splicing curtain wall adopts the liquid crystal screen as the splicing unit, overcomes the shortcomings of the DLP and the PDP curtain wall, and provides a splicing curtain wall with excellent performance and flexible use. Of course, since the backlight light source of liquid crystal products still uses a cathode vacuum tube (CCFL), the filaments and the headers at both ends of the lamp tube limit the size of the liquid crystal panel. The frame of the DID liquid crystal screen used in the current screen is still 4mm-10mm. The width of the stitching seam is therefore a disadvantage of the LCD splicing curtain wall, but with the input of LED backlight technology, this defect will be significantly improved. Fourth, the technical advantages of LCD Video Wall The advantages of LCD products over DLP products and PDP products in terms of using effects and technical parameters are well-known facts and need not be mentioned. Here I focus on two major advantages in the field of large-screen splicing. 1, the size of the size of the combination, the use of more flexible The LCD is available in various sizes and sizes. LCD splicing curtain wall, in addition to the number of arbitrarily selected outside [row (m) × column (n)], the screen size also has a variety of options, and can be mixed splicing, which meets the needs of different use of places. We know that in addition to realizing a full-screen large-screen display, a multi-screen small-screen display must be realized. For example, a splicing curtain wall of a traffic monitoring center more often requires the realization of simultaneous viewing of all monitoring points. When an abnormal situation occurs at a monitoring point, it can quickly zoom in to the full screen for monitoring center owners to watch at the same time. This requires that in actual use, the splicing curtain wall should achieve a good display effect on both large and small screens. DLP rear projection and PDP plasma splicing curtain walls have larger unit sizes, some of which can reach 100 inches or even 150 inches. This of course reduces the splicing seams when displaying large screens, but due to its lower resolution, if The use of a screen splitter achieves the purpose of displaying multi-channel images. The effect is not ideal, and due to the increase of equipment, the cost and stability of the system are greatly affected. The result is that the DLP splicing curtain wall can only be used to display a large screen, while many small monitoring screens still need to be displayed on the LCD monitor or other monitors. The signal switching is frequent and the effect is not ideal. LCD splicing curtain wall, no such problems. We know that LCDs are relatively small in size, but their resolution is the highest, and they can be spliced ​​in size and size. This is beneficial to the user according to the actual needs, and reasonably arrange the splicing scheme to achieve the size and fit. Get its appropriate effect. 2, stable long life, low maintenance costs Compared with DLP and PDP, the service life of LCD is very long, and the power is low, the heat is not great, and the failure rate is very low. PDP plasmas are prone to plasma imprints, and their dynamic display life may reach tens of thousands of hours, but when displaying high-brightness static images, screen burns may occur after 5,000 hours; DLP's lamp life is only 3,000 to 5,000 hours, therefore, it is recommended that in the selection of security monitoring large-screen splicing walls that require 24 hours of continuous use, the LCD splicing curtain wall should be considered as far as possible in order to increase the use efficiency and reduce the use and maintenance costs.
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