Page 1: Introduction to three large screen splicing technology
At present, the large-screen splicing system is divided into three categories: DLP, liquid crystal LCD and plasma PDP. Among them, DLP splicing is the most widely used. With the development of LCD and PDP splicing (also known as flat panel splicing) technology in recent years, the market position of DLP has been affected by both of them. With their respective advantages, rear projection splicing and slabs have been formed. Splicing divides the situation in the world.
Brief introduction of one or three large screen splicing technology
Let's analyze the differences between these three technologies:
The full name of DLP is "Digital Light Procession", which means digital light processing in Chinese, which means that this technology uses digital micromirror wafer (DMD) as the main key processing component to realize digital optical processing. The principle is that the light emitted by the light bulb is divided into three primary colors of RGB through a color wheel, and then the color is projected by the lens on the DMD chip; the digital signal of the digital micromirror wafer is converted into continuous light by the method of synchronizing the signals. For the gray scale, the colors are expressed in three colors of R, G, and B, and finally the reflection is imaged on the projection screen through the projection lens.
From the technical principle of DLP, it has the following advantages:
Fully digital: DLP technology provides a achievable projection method for displaying digital signals, thus completing the all-digital infrastructure.
Accurate grayscale: Its digital nature allows for fine image quality and color reproduction with precise digital grayscale.
Reflective advantage: Because DMD is a reflective device, it has more than 60% light efficiency, making the DLP system more efficient.
Seamless image advantage: Due to the rear projection method, the image can be 100% projected on the screen. Through the special processing of the screen edge, the gap between the screens is less than 0.5mm, which is commonly called seamless stitching.
Reliability: DMD has an effective service life of up to 100,000 hours.
Of course, DLP stitching also has its drawbacks. Since the light source of the DLP splicing is from the bulb, it consumes a large amount of power and has a high heat dissipation, and the brightness is lowered after a period of use, so that the user must constantly change the bulb to maintain the original display effect, and its unit box The body is large, it will cause some troubles during installation, etc., which brings inconvenience to the user.
However, with the continuous development of splicing technology, DLP splicing adopts DLP splicing unit after LED light source , which not only has a great breakthrough in service life, but also has revolutionized changes in color and power consumption. Let DLP splicing continue to maintain the market leading edge.
The LCD is called Liquid Crystal Display. The LCD is constructed by placing liquid crystals in two parallel glass. There are many vertical and horizontal small wires between the two glass. Direction, refracting light to produce a picture. Since the liquid crystal material itself does not emit light, a light pipe as a light source is provided on both sides of the display screen , and a backlight plate (or a light homogenizing plate) and a reflective film are formed on the back of the liquid crystal display, and the backlight plate is composed of a fluorescent substance. Light can be emitted, the main function of which is to provide a uniform background light source. The light emitted by the backlight enters the liquid crystal layer containing thousands of liquid crystal droplets after passing through the first polarizing filter layer.
The droplets in the liquid crystal layer are all contained in a small cell structure, and one or more cells constitute one pixel on the screen. Between the glass plate and the liquid crystal material is a transparent electrode, the electrode is divided into rows and columns, at the intersection of the row and the column, by changing the voltage to change the optical rotation state of the liquid crystal, the liquid crystal material acts like a small light valve . Around the liquid crystal material are a control circuit portion and a drive circuit portion. When the electrodes in the LCD generate an electric field, the liquid crystal molecules are distorted, and the light passing through them is regularly refracted, and then filtered through the second layer of the filter layer to be displayed on the screen.
LCD is a kind of splicing technology developed in recent years. Its biggest advantage is that it has low power consumption, light weight, long life, no radiation, uniform brightness, etc., but the biggest disadvantage of LCD is that the seam is larger. . The patchwork with a DLP of only a few tenths of a millimeter is unmatchable. This is also the key factor that LCD splicing only occupies the low-end market. In order to reduce the seams and reduce the gap that the seams bring to the user, LCD splicing manufacturers have been working hard all the time. . In recent years, the liquid crystal splicing unit has been stitched, from the initial 7.3mm to 6.7mm, and then to the newly launched 5.5mm LCD splicing unit in 2011, which has made breakthroughs in seams and set up LCD splicing again and again. tide.
PDP is the abbreviation of Plasma Display Panel, Chinese name is plasma display panel. PDP is a display technology that uses gas discharge. It uses a plasma tube as a light-emitting element. Each plasma tube on the screen corresponds to one pixel. The screen uses glass as a substrate. The substrate is separated by a certain distance and surrounded by a hermetic seal to form a A discharge space. The discharge space is filled with a mixed inert gas such as helium or neon as a working medium. A metal oxide conductive film is coated on the inner side surfaces of the two glass substrates as an excitation electrode. When a voltage is applied to the electrodes, a plasma discharge phenomenon occurs in the mixed gas in the discharge space. The gas plasma discharge generates ultraviolet light, the ultraviolet light excites the fluorescent screen, and the fluorescent screen emits visible light to display an image. When a phosphor screen coated with phosphors of three primary colors is used, the ultraviolet light excites the phosphor screen, and the light emitted by the phosphor screen is red, green, and blue. When each primary color unit realizes 256-level gray scale and then performs color mixing, color display is realized.
Compared with LCD technology, PDP splicing not only does, but the larger the screen, the higher the depth of field and fidelity of the image, and it also avoids the response time encountered in LCD technology, and the patchwork of PDP is now Up to 3mm, it is much smaller than the LCD splicing. Although it can't reach the stitching of a few millimeters of DLP stitching, it has little effect on the visual effect, and the screen of the PDP is very thin. Simply put, PDP splicing combines all the advantages of both LCD and DLP technologies while overcoming their shortcomings. Especially in recent years, plasma technology has overcome its own fatal shortcomings. After the phenomenon of “burning the screenâ€, more and more manufacturers have begun to enter the plasma market.
Page 2: Development trend and prospects of large screen splicing technology
Second, the development trend and prospects of large-screen splicing technology
DLP splicing has been applied to large-screen systems for more than ten years. The technology is mature and stable, and DLP technology is still improving and perfecting. After nearly two years of development, LED light source DLP splicing wall technology and products have matured and are already on the market. It has been widely recognized and widely used in various fields such as coal, electric power, water conservancy, civil air defense, emergency command, transportation, and government. The stitching gap of a few millimeters can be realized. After the LED light source is used, the rear projection splicing completely solves the two bottlenecks of consumables and maintenance difficulties, and the rear-projection splicing wall once again presents a powerful development opportunity. LED light source and the emergence of the emerging laser LED hybrid light source DLP rear projection splicing wall, let us see the DLP splicing wall a better tomorrow. Although the physical seams of flat panel splicing products continue to shrink, due to the limitations of its technical technology, it is impossible to break the unique advantages of physical seams of DLP splicing products below 0.5 mm in a short time, and the integrity requirements of the control room for image information display are very high. High, it is difficult to accept the visual image segmentation of "horizontal, vertical, cross seams such as chopsticks", the advantage of DLP is still very obvious.
The rapid development of liquid crystal splicing technology in the past two years is enough to show the development potential and technical advantages of liquid crystal splicing technology. From the aspects of display performance such as definition, brightness, viewing angle, color consistency, etc., the flexibility of splicing, post-maintenance and price, etc., LCD splicing screens are more dominant in large-screen splicing technology, and have been occupied in commercial applications. Absolute market advantage. The existing 55, 60 and other large-size LCD splicing units will be further reduced with the advancement of technology, and in the future, they will be able to compete with D60 splicing products such as 50 60 in the industrial field, and show their style in the field of large-scale video surveillance.
Third, the application of large screen splicing technology in different fields
As the application fields of large-screen splicing systems become more and more extensive, the differences in application characteristics of various industries are becoming more and more significant. For example, coal mines, electric power and other industries are most important for the processing and display of various monitored video and data, and national defense, The demand for virtual simulation applications in the scientific research field is also growing, and some systems emphasize the comprehensive use of information display and remote video. Targeted solutions for different industries have become increasingly important, and the “industry expertise†of solutions has become one of the key factors in market competitiveness. DLP splicing offers a wide range of configurations and size options, resolution options, seamless splicing, flexible display modes, and proven industry user solutions. Therefore, in applications such as command and dispatch systems, such as traffic command centers, meteorological bureaus, military demonstration centers, etc., where data presentation requirements are very fine, due to the need to display finer text image information, the integrity and completeness of image display High sexual requirements will be dominated by DLP stitching. Relatively speaking, the LCD panel can be easily spliced, the market is fully supplied, and the price is more competitive than the other two technical products. Therefore, the demand for the middle and low-end market of large-screen splicing can be quickly stimulated, and it is mainly used in the market. A video surveillance market and a public information display market with low requirements for patchwork and simple display. For the PDP splicing aspect, it still continues its high-end image, and it is applied in high-end fields such as conference systems and commercial displays.
3D display application
With the continuous progress of 3D stereoscopic video, holographic imaging and other technologies, more and more companies at home and abroad are engaged in the field of 3D display, and products are emerging one after another. 3D technology will revolutionize and change people's communication, work and lifestyle. 3D display technology is not only widely used in the fields of industry, architecture, military, medical, teaching, entertainment and public display, but also promotes the upgrading of traditional information, and it is quietly integrated into many areas of personal entertainment and digital home. 3D is like a fire, quickly burned the entire display industry, even the highly professional splicing display field is no exception. In mid-2010, a well-known DLP manufacturer in China released a high-definition stereo splicing screen system (3D splicing screen), which was used as a starting point. After that, all major professional exhibitions saw manufacturers exhibiting 3D splicing products. However, in stark contrast to the popularity of 3D projection, 3D TV, and 3D displays, 3D splicing displays are currently not favored by the industry. Mainly manifested in: 1, not suitable for long-term viewing; due to 3D's pursuit of visual shock, long-term viewing will appear dizziness, nausea and other discomfort, which is unacceptable to monitoring customers. 2, the realization of high cost: To achieve 3D, not only need display device support, a large number of front-end cameras, codec devices, matrices also need to be replaced to support 3D, storage devices and bandwidth must be multiplied, plus 3D glasses The price and cost are several times higher than those of ordinary 2D equipment. At present, everyone is generally optimistic about the application of naked eye 3D in splicing display, its use range will be as wide as 2D. However, the naked-eye 3D technology is still immature. People are too far away from the screen or the viewing angle is too large. The 3D effect is not obvious. If the distance from the screen is too close, people will have obvious dizziness. At present, many manufacturers are actively conducting research on naked-eye 3D. Some insiders said that in the next 3 to 5 years, people are expected to completely get rid of the shackles of 3D glasses. At that time, 3D splicing will be greatly developed in advertising, exhibitions and performances.
Shaped stitching
The concept of "alien" splicing: the value of irregular shaped splicing is mainly reflected in the application of business. Display applications in exhibitions, corporate halls, street-facing windows and other fields can create greater space utilization value through irregular design. And visual effects. Flexible and versatile splicing display combined function splicing curtain wall can be personalized according to the requirements of different users and different use environments. It can choose single screen display, full screen display, arbitrary combination display, image roaming, image overlay, image stretching and other functions. . Nowadays, the flexible splicing design of the large screen is more and more widely used, and it can be made into various rules and irregular shapes in people's minds to display colorful images and attract the attention of visitors.
For splicing display manufacturers, profiled splicing is nothing new. Many manufacturers have been involved in this technology for a long time. However, due to the fact that the technology was not very mature in the past few years and limited by traditional application fields, the splicing effect and the number of applications are not satisfactory. . Nowadays, the splicing technology has made rapid progress, and the expansion and application in new fields such as exhibition display, advertising media, performance entertainment and so on have also made great progress, which makes the shaped splicing glow with new vitality and once again received the attention of manufacturers. In recent years, the splicing display technology has been developed in the direction of light and thin, and on the other hand, it emphasizes stability and flexibility. We can see that the currently spliced ​​display products led by liquid crystals can be arbitrarily inverted and rotated, and placed and spliced ​​at any horizontal and vertical angles, which makes the shaped splicing easier. Alien stitching will be more developed in the show rental and exhibition industry, and is sought after in the entertainment and media industries that are striving for fashion and need to bring new visual experiences to people. The demand determines the direction. With the deep application of the large-screen display products, the special-shaped splicing will inevitably become another new application hotspot.
Page 3: Interactive touch and LPD display technology
Interactive touch
As the application field continues to expand, many venues such as classroom training rooms, entertainment centers, TV studios, airport stations, and commercial centers have become the target markets for large-screen splicing products, which are in use with traditional professional control rooms. It is very different, not only requires the product to be simple and easy to operate, but also has a certain interest. The addition of interactive touch technology has transformed the splicing system from a simple display product to an interactive information display platform. Tiled walls with interactive touch capabilities have become more flexible and versatile. Through touch technology, users can query all kinds of information, play games, and control the application of various programs. Users not only experience the fun of participation, but also make the operation easier.
The prospect of interactive in the splicing wall is very large, and the future human-machine information processing mode with high efficiency and high recognition rate will become the mainstream demand. However, due to different customer demand characteristics, the manufacturer not only needs to provide hardware, but also needs to write software according to various applications. To achieve different interactive functions, this has led to a lot of cost improvement, and at present, few customers have raised this demand, so manufacturers are more willing to wait and see. Therefore, the current market application is still in the stage of promotion and development, and needs to be nurtured. For the future market, he is more optimistic about the application of education, conferences and exhibitions. Interactive touch technology opens up new possibilities for splicing products, especially in education, conferences and exhibitions. It seems that the prospect of interactive stitching is good.
LPD display technology (laser phosphor display)
The advantage of the splicing wall based on the laser phosphor display technology is that it can be displayed in any size, any size, and viewed from any angle, and the display adopts a laser cold light source, which emits almost zero heat during operation. Compared with the conventional technology, the LPD display splicing wall The energy consumption is reduced by 75%, which reduces the released greenhouse gases by 80%. It is not only environmentally friendly but also greatly reduces the operating costs of customers later. In addition, the LPD display wall has the industry's highest 240Hz refresh rate and 0.25mm minimum seaming technology. In real-world applications, customers can experience immersive communication using dynamic video or direct interaction with the display.
O led display
Compared with the existing display technology, OLED has all solid state, active illumination, high brightness, high contrast, ultra-thin, low power consumption, no viewing angle limitation, wide operating temperature range (-40 ° C ~ 80 ° C), can achieve soft display, etc. Many advantages. In addition, because there are no liquid molecules in the OLED, it has better seismic performance, low temperature resistance and durability.
At present, the OLED industry has not yet reached a mature stage, especially in the application of large-size products. But OLED industry is not a new industry, nor is it a growing industry, but the outbreak has entered a period of industry: especially now (2012) onwards, large size, small size O led screen will be explosive growth of.
Laser (LASER) light source
The laser (LASER) display technology is a display technology using high-saturation red, green, and blue (RGB) three-primary lasers as light sources. It makes full use of the characteristics of laser wavelength selectivity and high spectral brightness, so that the display image has a larger color gamut performance space, the color gamut coverage can reach 90%, and can achieve twice the color reproduction ability of the traditional light source, color The saturation is more than 100 times that of the conventional display. In addition, the laser light source has the characteristics of high light energy utilization, high brightness, long life and low attenuation, and is the most ideal display light source in the future.
Pure laser sources have been applied to DLP rear projection products and have been unveiled at the show.
Fourth, the conclusion
For a considerable period of time in the future, due to the development of the existing three splicing technologies and their inherent product defects, they will still coexist in the large screen splicing market, with seamless splicing technology and long-term white balance. Consistency, these LCD LCD and PDP stitching are inferior to DLP. DLP splicing will still be the mainstream technology in the high-end market of control room, command and dispatch center, operation management center, video conference, studio, and control position. Flat panel splicing relies on the product's light weight, easy installation and high-definition display characteristics, and is more suitable for small-scale control applications dominated by video signal monitoring. Therefore, the future trend of tablet splicing will develop into low-end markets such as video surveillance, digital advertising, media announcements, and information dissemination. Complementing high-end DLP products.
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