P1.5 Detailed Introduction of Small Spacing LED Display Screen

Analysis of Market Development Trend of Small Spacing LED Display Screen

Application Analysis of Splicer in Small Spacing LED Display Screen

1. Requirements for image mosaic processorAs the pixel spacing of LED display screen becomes smaller and the viewing distance becomes closer, in order to achieve excellent display effect, not only the LED display screen itself is required to improve in image processing and assembly technology, but also higher requirements are put forward for the image splicing processor at the front end of LED display screen (hereinafter referred to as splicer):(1) Verify the output synchronization to avoid the asynchronous phenomenon of splicing pictures;(2) Optimize the image processing algorithm to maintain the high definition of the scaled image;(3) Customize the output resolution to deal with the irregular physical resolution of LED display screen.2. Splicing technology applied to small spacing LED display screen2.1 combination of splicer and small spacing LED displayA key application of splicer is that it can output multi-channel DVI signals to splice and display multiple display screens arranged in matrix, so as to make it a complete display area in logic.For the LED display screen, we can define the display area driven by an LED controller as an independent LED display screen. The current LED controller uses DVI / HDMI as the signal input interface and supports the maximum input resolution of 1920 1200 60Hz, the maximum bandwidth is 165mhz, and the maximum physical resolution of the driven LED display is 1920 1200With the increasing display area of LED small spacing products, projects of tens of square meters are common, and the physical resolution of LED display screen often exceeds 1920 1200, that is, each super large-scale LED display screen is composed of several independent display areas driven by several LED controllers. For the application of splicer, it only needs to provide several DVI output interfaces corresponding to the number of LED controllers and splice the whole LED screen.In the application of splicer in small spacing LED display screen, several key technologies deserve attention:(1) Output synchronization of signalThe multi-channel DVI signal output of splicer must have the problem of signal synchronization. When the asynchronous signal is output to the LED display screen, the picture will be torn at the splicing, especially when playing high-speed moving images. How to ensure the output synchronization of signal has become the key to measure the success or failure of a splicing system.(2) Graphics processing algorithmWe know that the point-to-point image display effect is the best. For the reduced image, if only ordinary graphics processing technology or general FPGA graphics processing algorithm is used, the edge of the image will appear sawtooth, even pixel loss, and the brightness of the image will decrease. The high-end image processing chip or FPGA system using complex graphics processing algorithm will maximize the display effect of the reduced image. Therefore, good graphics processing algorithm is a key technology of splicer applied to small spacing LED display screen.(3) Non standard resolution outputThe small spacing LED display screen is spliced by a matrix of display units of the same specification. The size and physical resolution of each display unit are fixed, but the whole large screen spliced is often not a standard physical resolution. For example, the resolution of the display unit is 128 96, can only spell 1920 1152, but can't spell 1920 1080 In the super large-scale splicing system, the LED display area driven by each LED controller may not be the standard resolution. At this time, the output of the splicer with non-standard resolution is critical. It can help us quickly find the appropriate splicing method, so as to reasonably allocate resources and effectively save the number of LED controllers and transmission equipment.2.2 splicer for small spacing LED displayAt present, splicers can be divided into four categories: embedded pure hardware architecture, PCI-E bus architecture, distributed network architecture and hybrid architecture.(1) Embedded hardware only architectureThe whole machine structure usually adopts the design of "backplane signal acquisition board main control board signal output board". The signal acquisition board performs signal processing such as video acquisition, scaling, superposition and format conversion. The processed signals are transmitted to the FPGA signal processing system of the main control board through the backplane bus, and the configuration of the main control FPGA is realized through the embedded ARM system Communication with upper PC, data exchange between systems and other functions, and output the signal to the display terminal through the signal output board.The structure of the splicer with pure hardware architecture is relatively simple and not prone to system failure; The acquisition board and output board are hot pluggable and easy to replace; It can realize the acquisition and processing of multi-channel and multi format signals; Backplane switching technology and output board unified clock technology ensure the synchronization of multi-channel signal output; The resolution of each DVI output signal can be customized, which conforms to the splicing characteristics of LED display screen.Many characteristics make the pure hardware architecture quickly become one of the mainstream products in the field of splicer. However, due to the use of FPGA as the core image processing unit, the quality of the algorithm determines the processing effect of a splicer, especially the image scaling algorithm. How to optimize to achieve a clearer display effect has become an important index to determine the product value of pure hardware splicer.(2) PCI-E bus architectureUsually, the splicer of bus architecture adopts PCI Express technology, and the available data bandwidth is up to hundreds of Gbps. The host is equipped with high-performance CPU and large memory. Different operating systems (such as 64 bit windows7) can be pre installed according to different application fields, and various application programs can be run directly. The splicer is equipped with multiple high-performance graphics output cards. Each output card has ultra-high internal bandwidth and video memory, and all output images are synchronized to eliminate image tearing between display units. At the same time, it is also equipped with multiple input cards, supports a variety of signal formats, and can process the input signals.PCI-E bus architecture splicer is a high-performance computer. All components use the most advanced and mature technologies of major hardware manufacturers. For example, Intel can be used as CPU and NVIDIA can be used as graphics card. All high and new technologies in the computer field can also be quickly integrated. This makes the PCI-E bus architecture splicer have incomparable advantages in operation speed, image processing, operation mode and so on.The threshold of PCI-E bus architecture splicer is very low. For simple applications, an industrial computer and a professional multi-channel output graphics card can be realized.On the other hand, how to solve the problem of system stability, how to design an intuitive and powerful control software, and how to solve various problems of data transmission under high bus bandwidth all need a strong R & D team and strong capital foundation, as well as the accumulation of experience. In other words, the high-end PCI-E bus architecture splicer not only needs to meet the most basic applications such as signal acquisition, processing and splicing, but also needs more investment in the design of system stability and software ease of use, so as to make the splicer meet various harsh application environments.However, it should be noted that most bus architecture splicers use Windows operating system. Once attacked by virus, the system may be paralyzed and stop displaying. Moreover, due to the use of customized graphics cards, the resolution of each output channel generally needs to comply with the VESA (Video Electronic Standards Association) standard. Non standard resolution output cannot be defined, and different resolution of each channel cannot be defined.(3) Distributed network architectureThe splicer of distributed network architecture usually adopts node hardware structure. Each input and output node is independent and connected to the central switch through twisted pair to transmit data interactively.Its core is a set of advanced video coding and decoding technology. Through various signal input nodes, the collected DVI, VGA, YPbPr, CVBS, 3g-sdi and other signals are processed and encoded. Through the special network communication protocol, the encoded video is transmitted through the central switch to the output node for decoding, converted into DVI digital signal and output to the display terminal.The synchronization of output nodes has become the key to the application of the system. One method is to send the synchronization code directly through the network to realize the synchronous output of multiple output nodes. However, due to the existence of network bit error rate, the output will still be out of synchronization after this mode runs for a period of time. Another method is to physically connect multiple output nodes through the sync interface, select one output node as the host, and actively send synchronization codes to other output nodes, so that all output nodes can receive synchronization signals at the same time, so as to realize real frame synchronous output, so as to ensure that the displayed image is complete and there is no tear at the screen splicing.At present, the application of distributed network architecture splicing system is more and more. Due to its distributed characteristics, it is convenient for the integrated wiring in the whole building and the centralized management of multiple display terminals in different areas. With the help of advanced visualization software, it can provide users with humanized, visual and comprehensive services.However, limited by bandwidth and codec technology, the distributed network architecture does not support the access of dual link DVI digital signal and HDMI signal. At the same time, because the coding, processing, decoding, signal synchronous output and other links all need frame cache, there is a gap in the real-time performance of data compared with other splicing technologies. In addition, the number of point-to-point points to be displayed exceeds 1920 For 1200 resolution images (more than two signal input nodes are required), the resynchronization output of multi-channel synchronization source input signals cannot be guaranteed.(4) Hybrid architectureHybrid architecture generally refers to the splicer or splicing system in which two or more of the above three splicing technologies are combined.For example, PCI hardware backplane bus architecture splicer, its system control and image processing are realized independently. PCI bus is responsible for system control and running the operating system in the background; The hardware backplane bus is responsible for video image processing. The system allows synchronous processing of a large number of high-resolution input signals. At the same time, it can still maintain real-time operation performance and best image quality at full frame rate, and ensure the synchronization of output signals. For important emergency places, it can ensure that the screen will never be black. Even if the operating system in charge of PCI bus fails or virus infection, it can ensure that foreign video images can be displayed at any time through the special backplane graphics processing bus.Through the hybrid architecture, it can be applied comprehensively, learn from each other, and greatly increase the stability of the system. This is also the development direction of splicing technology in the future, and has a broader application space.3. Application of small spacing LED displayAt present, small spacing LED display is widely used, including but not limited to:Military exercise command systemPublic safety display command systemPower dispatching systemTraffic network and aviation monitoring display systemEnergy industry production scheduling systemConference display system for government, enterprises and institutionsRadio and television media display systemPublic place information release systemAs a new generation of background wall display terminal, small spacing LED display is providing high-quality services for key systems in all walks of life.

How Can We Make the Small Spacing LED Display Screen Not Black

Do you know how to make the small spacing LED display never black?As we all know, do you know how to make the small spacing LED display never black? The LED display screen is not an ordinary electrical appliance formed at one time in the factory, but a product made on site according to the customer's use requirements and installation environment. The failure rate is much higher than that of other electrical appliances. Therefore, it has high requirements for the rigor of on-site production personnel and after-sales requirements of the manufacturer.In recent years, the application of small spacing LED display screen is becoming more and more popular. With the unique advantages of display effect, its application places range from ordinary conference room, monitoring room and Exhibition Application to National Conference Center, monitoring center, CCTV and large-scale events. Such as G20 meeting, Zhu rihe military parade and Tianjin National Games, the figure of small spacing LED display screen is everywhere.However, as a new technology and high-precision equipment, in addition to the excellent display effect, the user needs are also accompanied by stability considerations, because once the black screen appears in the main venue, it will have a significant international impact and even political impact, such as the 5-ring to 4-ring of the Tianjin National Games.Application field analysis of small spacing display screenAs a new generation of indoor professional display panel, small spacing LED has formed the most direct impact on the traditional DLP. In other words, small spacing LED has actually formed a technical replacement for DLP in product application. But this substitution is not a simple one-to-one. There are still great application differences between small spacing LED display and DLP, so the technical selection of screen is particularly important for different projects.Therefore, when the small spacing LED is used as the main screen of the venue, its stability assessment is the top priority, and the first one is that the screen cannot be black.Analysis of the reasons for never black screenBecause of this demand, we deeply analyze the causes of black screen, so as to fundamentally eliminate the hidden dangers of black screen and truly never black screen. The display screen is an electronic device, the internal control card chip is FPGA, and there is no operating system, so the reasons for the black screen can be classified into two parts, one is device failure and the other is cable failure.1: Equipment failureEquipment failure mainly occurs in two devices: receiving card and switching power supply.A: Receiving cardThere are many devices on the receiving card. An ordinary receiving card integrates two gigabit network communication interfaces, 120P light board drive interfaces, SDRAM, flash, etc. with more than 10000 solder joints. Due to the inductive load of LED, its working environment is relatively complex. In order to pursue ultra-thin, some manufacturers sacrifice internal heat dissipation space and use mini cards. Their electronic devices have many contacts, complex electromagnetic environment and internal high thermal environment, resulting in reduced working stability. An accidental capacitor fault may cause abnormal screen display.B: Switching power supply failureThe LED display screen is an inductive load, and the output load changes with the picture, which has a great impact on the internal devices. In addition, there are many internal capacitors in the switching power supply. In order to reduce the use cost, some manufacturers use the switching power supply with automatic fan cooling. Because both capacitors and fans have a short service life, it has become the most frequent inducement of switching power supply faults, and the black screen fault caused by power supply fault ranks first in the whole device and equipment.2: Cable failureCable faults are mainly divided into external connecting cables, such as cables that provide power and signals to the screen, and internal cable faults, such as internal DC power line, internal gray line, etc.A: External cableAmong the external cables, the signal cable has the highest failure rate and the greatest impact. The signal cable commonly used for the display screen is CAT5e cable, which is difficult to ensure the stability of signal communication due to material construction and other factors, especially the butt joint of 2-end crystal head, with poor vibration resistance.B: Internal cableThe internal cables are mainly gray cables, as shown in the figure below. Most of the gray ribbon cables are made by cold pressing. After many times of plugging, the contacts are easy to have poor contact, and even the gray ribbon cable is broken seriously. Therefore, the internal cable fault has the highest incidence of all cable connection faults.Coping strategies of never black screenThe above analyzes several reasons for the black screen. We will apply the right medicine to the case, shield the above problems from the design end, and fulfill our commitment to customers and users - never black screen.One of the sharp tools to never black screen: no receiving cardCompared with the traditional receiving card design scheme, our company adopts the scheme without receiving card to highly integrate the products,The special chip with higher integration is designed on the adapter board. The chip integrates gigabit network communication, FPGA, SRAM, flash, MCU, etc. in the conventional receiving card. It has changed from seven ICs to one IC, which is highly integrated, reduces the solder joint connection by 80%, reduces the failure rate of electronic devices from the front end, and then improves the system stability.Never black screen sharp weapon 2: no flat cable, connector hard connectionCompared with the flat wire connection just now, there is no connecting cable inside, and all transmission is carried out through PCB and connector, which avoids hidden dangers such as multiple plug-in fatigue of cables and poor contact caused by conventional cold pressing from the design end.Never black screen Sharp Weapon 3: dual power supplyAs mentioned above, switching power supply failure is the first among device failures, so dual power supply backup is generally adopted for high-end applications. At the same time, the switching power supply designed by our company has the function of automatic current sharing, that is, two power supplies are output at the same time, which can reduce the workload of the power supply, prolong the service life of the power supply, avoid the power grid impact caused by the cold switching of the power supply, display jitter or third harmonic caused by equipment restart, and monitor the power supply status in real time at the software end, It can also be replaced quickly during maintenance to eliminate faults.Never black screen Weapon 4: loop designAccording to the level of on-site demand for signal stability and cost budget, our products can complete four levels of backup. The two most important levels of backup are dual interface and dual loop, and dual interface and four loop. Dual interface and dual loop are generally used for TV stations, while dual interface and four loop are used for live broadcasting, national live conference, etc.Double interface and double loop of never black screen loop designAs shown in the figure above, two independent signal loops are composed of dual signals, which can ensure that when one loop fails, the other loop can be switched immediately and the switching time can be reduced 0.1ms. For the hot standby places where some TV stations require power interfaces, power connectors can be added to realize dual power supply and dual signals on the screen. At the splicer end, two independent duplicate signals can be output to two transmission boxes through the backup board card.Double interface four loop design of never black screen loopThe backup level is the highest level, that is, the four input ports of the signal can work normally as long as one is normal. This backup mode is adopted for the main screen of the venue of the Guangzhou Asian Games. Of course, this backup mode will increase the cost of front-end equipment, which is usually more than 4 times higher than the conventional configuration. The above is the solution that the small spacing LED display screen will never be black. I hope it can help you.

With the Rapid Development of Small Spacing LED Display Screen, Enterprises Have Laid Out Their Chan

After more than ten years of development, the market pattern of the LED display industry has basically taken shape. After the waves washed away the sand, several large enterprises with annual sales of more than 1 billion yuan have emerged. The rapid intervention of capital has stabilized the pattern of the medium and high-end market. These enterprises are basically playing the game in the medium and high-end field. However, the middle and low-end wholesale market is full of variables and irregularities, in which there are huge business opportunities and potential. Some enterprises have smelled the new information released by the wholesale market and have laid out their channel development strategies.1 The scale of small spacing market is increasing year by year, and the spacing miniature market is rising. According to the data of authoritative institutions, the global LED display market scale in 2017 was US $5.092 billion, of which the indoor small spacing ( p2.5) will continue to grow after the rapid development in previous years. The market scale in 2017 was US $1.141 billion, and it is estimated that the CAGR will reach 12% from 2017 to 2021. At present, small spacing LED products are still mostly used in high-end fields such as military applications, government monitoring and command centers and large video conference systems. Under such a situation, it seems easy to find that with the gradual maturity and promotion of the market and the comprehensive improvement of production technology. In 2018, in the future, small spacing products will be more applied to a wider range of indoor display, and show us more and more amazing display effects.Moreover, with the continuous rise of the spacing miniaturization market, LED display enterprises have gradually turned the market direction to three major technologies. Including cob small spacing LED products, QD phosphor, RGB small spacing display technology and microled display. In the context of rapid growth, the supporting brand pattern of cob small spacing LED display will also change in 2018 - not long ago, Lehman (300162) has given the news that it will provide cob small spacing third-generation products in the first half of 2018. It is also reported that the industry leader liad (300296) also intends to develop small spacing LED products of mini-LED technology. Moreover, Yiguang, the core upstream supplier of lyad, has clearly pointed out that it will launch a LCD backlight system based on this technology in 2018 and will fully enter the mini-LED industry market.However, it must be mentioned that after its launch in 2017, microled display products once became one of the hot topics in the industry. They are favored by technology priority enterprises because of their significant advantages such as wider viewing angle, higher contrast, better image quality, lower cost and seamless splicing. At the same time, it can also be seen that traditional display screen manufacturers and LCD manufacturers expect to enter the micro LED display market in the form of alliance and cooperation. It is not difficult to see that the future small spacing market is unlimited and unpredictable. Always believe that "the heart is as big as the stage", and the global LED small spacing display market will continue to maintain high-speed growth.2 Although small spacing has been baptized by the "price war", it still does not forget the breakthrough in new fields. In 2017, the small spacing LED market has not been spared the impact of the "price war". However, in the past four years, the small spacing LED display system has shown an explosive growth trend, and the application field of small spacing LED display has been continuously expanded. From the initial advertising market to the current radio and television, performance, conference, command and dispatching, and even high-end villa color TV, there are few fields in the display industry without small spacing led participation. Especially in the second half of 2017, Samsung achieved a breakthrough in the "digital film screening" market with small spacing LED screens. This market has been a "private plot of projection display" since the birth of film technology. Although Samsung's breakthrough is almost "experimental", it has attracted extensive attention from a large number of people in the industry.It can be seen that it is a major breakthrough to usher in the digital film market in the field of small spacing. At the same time, it also means the extension of small spacing market in more segments. However, a series of cutting-edge technologies of small spacing LED display have not really realized the mass production mode. This key factor will also be the biggest obstacle to how long the small spacing LED display field can persist in the digital film market in 2018. According to the product technology and hardware equipment produced at the present stage, it may take two or three years... Or even longer to make substantive progress. However, the third generation of small spacing LED products will also be put into the market with market changes. Before that, the pixel granulation and visual comfort of traditional surface paste products were obviously not conducive to the large-scale development of small spacing led in the digital film projection market. Therefore, there is still a long way to go for the future small spacing market to achieve real development in the field of digital film.3 The pattern of indoor display market dominated by small spacing LED is also changing quietly. In 2017, the small spacing LED screen market continued to maintain a high growth rate, but the market pattern seems to be changing quietly. Small spacing LED screen breaks the market boundary that led display can not be used indoors, and opens a new market era of competition with other display technologies. In this regard, industry insiders pointed out that the more small spacing LED screens expand the field of indoor application, the more they encounter "more competition with competitive products and technologies". The latter naturally promotes more brands, channels and capital forces to enter the small spacing LED industry. These new franchisees have also developed more market M & A events, product OEM market and detailed competitive market structure.The emergence of the above phenomena depends not only on the strong basic strength of small spacing LED display in the industry, but also on the development trend of its display application, such as increasing complexity, diversification and informatization. To truly stand in this field, we need not only the comprehensive improvement of display terminal technology, but also the support of standardized solutions. Therefore, we firmly believe that 2018 will be a year of small gap maturity and comprehensive breakthrough development. What kind of surprises will appear in the industry reform? Let's follow the development of technology and wait and see!

Introduction to the Characteristics of Small Spacing LED Display Screen

With the increasing value of small spacing large screen system in command / dispatching center and video conference system in many fields, as well as the continuous improvement of national informatization, new industrialization construction and management application level, the rise of safe city and smart city, and the large screen splicing market will continue to maintain a stable growth trend in the future, From 2011 to 2019, the compound growth rate of market scale will exceed 40%.At the same time, due to the demand of various industries in terms of clarity, brightness, contrast and size, with the rapid growth of social informatization, the demand for information visualization has also expanded sharply. At the same time, it is more and more difficult to realize high-end visualization, especially in some important places such as monitoring center, command center and dispatching center, Therefore, large screen splicing system has become an indispensable core basic system for information visualization.In order to meet this development demand of the market, Jingrui Chuangxian jrcld has launched a variety of more accurate products. Taking the p0.7 p0.8 p0.9 P1.2 P1.4 P1.5 P1.6 small spacing LED display products of Jingrui Chuangxian jrcld as an example, a new generation of fully sealed front and rear full die-casting aluminum box design is adopted. The traditional die-casting aluminum box usually only supports post maintenance and installation, The new generation of full die-casting aluminum box can take into account the front maintenance and installation, which not only maintains the characteristics of high precision, no seam and excellent flatness of the traditional die-casting aluminum box, but also takes into account the characteristics of magnetic suction front maintenance, space saving and convenient installation.High brightness: brightness 1000nit, higher than LCD and DLP rear projection brightness, and can be automatically adjusted to achieve obvious energy saving and consumption reduction effect.Golden Ratio Design: original 16:9 gold unit size and resolution design, showing a perfect vision.High refresh rate: 2K / 4K / 8K # standard resolution display screen, with stable display, no ripple and flicker, and real and natural display effect.Wireless plug-in: full cast aluminum die-casting box structure, light and stable, wireless connector splicing between boxes, simple and generous appearance.High contrast: high quality surface paste three in one LED Black lamp is adopted, and the contrast can reach 5000:1.Strong processing ability of fast dynamic picture: nanosecond response time. When processing fast dynamic picture, there will be no tailing and ghosting.Front and rear maintenance: compatible with the front and rear maintenance methods, the disassembly is convenient and fast, saving maintenance time and cost.Good color consistency: the single point luminance meter color correction technology can ensure the uniformity of brightness and color when the product leaves the factory. It also has skin color restoration and green restoration technology to make the picture color more realistic.

Classification of Cob Small Spacing LED Display Screen

There are many kinds of LED display screens, including single / double color, full-color, conventional, special-shaped, ordinary model, small LED spacing and cob spacing.Led small spacing is a general term for point spacing below p2.5. Cob small spacing is customized for P1.0. Single and two colors are first used to display subtitle rotation. Full color LED display screen is the overlord of advertising display. Conventional / special-shaped shapes are selected according to needs. Special-shaped shapes are customized according to imagination, and the regular shapes are square and upright.Whether it is led small spacing, cob small spacing, conventional / special-shaped, single and double, they can be further classified, that is, model. What are the categories of cob small spacing LED displays?At present, the packaging technology of cob display screen has not been popularized, so there are not many manufacturers that can produce cob display screen. To what extent? can be counted on one's fingers! What are its models?Conventional models of Dayuan intelligent cob display screen include p0.625, p0.9375, p1.25 and p1.56, but some models are used for standard control, so there are also special models, such as 1.27.In the LED display screen, the selection of model is directly linked to the price. The smaller the spacing is, the higher the price is. Accordingly, the display screen is clearer and the performance is better. However, the function is matched with the scheme, which has little to do with the model.Cob small spacing classification has no single and two colors, but full color, because this kind of display screen is biased towards liquid crystal display. The difference between cob and LCD is that cob display can work with high intensity in severe environment, the display is very stable and the service life is very long.Cob display screen is an evolutionary version of LED small spacing. If you know about the industry, you will be impressed. The development trend of LED small spacing last year is sufficient because of its good performance. The practicability of cob display as its evolution is more self-evident, but when choosing cob display or LED small spacing and other LED displays, it is not good to choose the one with small spacing, because the budget is really very different. Therefore, on-demand selection is what is really needed.lw

Technical Principle Analysis of Small Spacing LED Display Screen

Small spacing LED display refers to indoor LED display with LED point spacing of p2.5 and below, mainly including p2.5, p2.083, p1.923, p1.8, p1.667, P1.5 and other LED display products. With the improvement of LED display manufacturing technology, the resolution of traditional LED display has been greatly improved.Today, we tend to take LED video display for granted. So do we know how the LED screen works? What is the principle of HD small spacing LED display? In fact, they become the common characteristics of our towns and us, mainly focusing on their external quality parameters.Five core technologies of small spacing LED display1. Reduce the dead light rate of the display lamp and ensure the stability of the screenThe dead light rate of the traditional LED display screen is one in tens of thousands in the industry standard, but the small LED display screen with small spacing can not be done temporarily. If there is one dead light in 10000 square meters according to the previous standards, the display screen can hardly be seen. Therefore, the dead light rate of small spacing LED display screen must be controlled at 1 / 100000 or even 1 / million in order to meet the needs of long-term use. Otherwise, if there are a large number of dead lights for a period of time, users can't accept it.2. Achieve low brightness and high grayMany people know that human body induction lamp is different from outdoor display, which requires high brightness, high refresh rate and energy saving. Indoor display needs to reduce the brightness. Experiments show that from the perspective of human eye sensitivity, the brightness of LED (active light source) is twice that of passive light source. In terms of specific data, the best brightness for small spacing led to enter the room is 200-400cd / m2. However, the gray loss caused by reducing brightness needs to be completed through technical supplement. At an exhibition of lianchengfa in 2016, the large screen display performance network released the test samples of small spacing led and gave the test methods and standards. The test shows that at present, only a few LED display manufacturers can achieve low brightness and high gray at the same time, and most manufacturers need to improve to a certain extent.3. Standard resolution of signal sourceUnlike the outdoor display, the outdoor advertising chamber of Commerce selects the content and display suitable for playback according to the resolution of the display screen. The indoor display signal source has certain standards. As a manufacturer of LED display screen, it is not required that the signal source connected to the indoor must adapt to the resolution of the display screen, but to adapt to the needs of the indoor signal source and design and ensure the corresponding resolution, So as to meet the needs of users as much as possible. Fortunately, after more than a year of understanding of indoor LED display products and customer needs, lianchengfa has completed this transformation and greatly met the needs of the majority of users.4. Support system access, display and control of multi signal and complex signalCompared with the outdoor display signal, the display signal of small spacing Lede display is characterized by multi signal access and complex signal access, such as multi place video conference, which requires remote access signal, local access signal and multi person access. The experiment shows that the simple implementation of multi signal access through excessive screen cutting scheme will reduce the signal standard. Therefore, how to solve the problem of multi signal and complex signal access also needs the technical support of small spacing led.5. Realize seamless joint and high-speed correctionThe biggest advantage of small spacing LED display is seamless, but it requires high splicing. For liquid crystal, as long as the seam is uniform, there is no problem, and the seam is not obvious. However, the small LED spacing can not be like this. If the modules are too tight, there will be bright lines. When the modules leave, there will be dark lines. So it's not easy to splice well. Therefore, the process and correction technology of the box and the guarantee and good combination of efficiency need to be guaranteed.Scanning mode of small spacing LED displayDynamic scanning: dynamic scanning implements "point to column" control from the output of driving IC to pixel points. Dynamic scanning requires control circuit, and the cost is lower than static scanning, but the display effect is poor and the brightness loss is large.Static scanning: static scanning implements "point-to-point" control from the output of driving IC to pixel points. Static scanning does not need control circuit, and the cost is higher than dynamic scanning, but it has the advantages of good display effect, good stability, small brightness loss and so on.With the development of LED technology, the brightness of LED electronic display screen is also increasing, and the size is becoming smaller and smaller, which shows that more LED small spacing electronic display screens will become the general trend.However, the improvement of brightness and pixel density of LED small spacing display also brings new and higher requirements to the control and drive of LED small spacing display. As far as the general indoor screen is concerned, the current common control methods adopt the row column split control mode, which is commonly referred to as the scanning mode. At present, the driving modes of LED small spacing display screen include static scanning and dynamic scanning. The static scanning is divided into static real pixels and static virtual, and the dynamic scanning is also divided into dynamic real image and dynamic virtual;In the LED small spacing display screen, the ratio of the number of rows lit at the same time to the number of rows in the whole area is called scanning mode. The scanning is also divided into several driving modes, such as 1 / 2 scanning, 1 / 4 scanning, 1 / 8 scanning and 1 / 16 scanning. In other words, if the driving mode of the display screen is different, the setting of the receiving card is also different. If the receiving card was originally used on the 1 / 4 scanning screen and is now used on the static screen, the display on the display screen will be bright every four lines. Generally, the receiving card can be set. After connecting the sending card, display screen, computer and other main devices, you can enter the relevant software on the computer for setting. Here we will first introduce the scanning mode and principle of LED small spacing display screen.Display principle of HD small spacing LED screenLED screen display resolution (so-called spatial resolution), which is closely related to the distance or pitch between pixels in LED video display;Maximum brightness of LED screen: the dynamic brightness range is understood as the number of brightness levels of the screen that can be supported (sometimes referred to as radiation or energy resolution);LED screen frame rate usually measures the frequency of frame change per second (FPS) (sometimes referred to as time resolution) of new data display that a video source can feed the whole frame;The number of LED screen refresh rate (in Hertz) is to draw data in the second display hardware, or refresh frame (also known as time resolution);Spectral resolution of LED screen: color images distinguish light of different spectra. Multispectral images solve even better than the need for different wavelengths of spectrum or copied colors. This word determines how many spectral components create an image; Color uniformity throughout the screen; Possibility of white balance and fine adjustment;Linear brightness sense of LED screen - subjective image quality, which determines the human eye to distinguish the dark and bright parts of the screen with adjacent brightness levels;LED screen image comparison; Image quality depends on the viewing angle. In addition to image quality, it is important to consider some key operating parameters of LED video display.The principle of high-definition small spacing LED display is briefly described; Mature software and integrated control system enable the system to expand and build led and LCD video display network and remote control through the Internet and built-in information security subsystem; The level of electromagnetic radiation is in the form of electromagnetic interference (EMI) from the screen.

On the Reasons for the Popularity of Small Spacing LED Display Screen

In recent years, the small spacing LED display screen in Zhengzhou, Henan Province has stood out among many display screens and occupied most of the LED screen market. Small spacing, as the name suggests, is that the point spacing of the screen is small and the resolution per unit area is high. The biggest competitiveness of indoor high-density LED display is that the display is completely seamless and the display color is natural and real. Usually, the distance between light beads is less than 2mm, so this display can display higher definition graphics, images and video, as well as more video and image images.So why are small pitch displays so popular? What's the secret of it? Today, let's learn what's great about the small spacing LED display.1. Ultra high definition, perfect picture quality, seamless splicing, exclusive visual feastThe splicing large screen display technology can not avoid the influence of the physical frame when meeting the needs of customers to the greatest extent. Even the ultra narrow side did professional LCD screen still has very obvious splicing seams. Only the LED display screen makes the splicing seams meet the seamless requirements, and the advantages of high-density and small spacing led seamless splicing are highlighted.2. High brightness intelligent adjustableThe LED screen has high brightness. In order to meet the comfortable viewing effect for the viewer in strong light environment and dark light environment and avoid visual fatigue, it can cooperate with the light sensing system to adjust the brightness.3. High gray level for better color performanceEven under low brightness, the gray scale performance of the display screen is almost perfect, and the level and brightness of the display screen are higher than those of the traditional display screen. It can also show more image details without information loss.4. High contrast, faster response speed and high refresh frequencyThe number of times the electron beam repeatedly scans the image on the screen. The higher the scanning times, the higher the refresh rate, and the better the stability of the displayed image. The lower the refresh rate, the more severe the image flicker and jitter, and the faster the eyes get tired. Under high refresh, the LED small spacing screen has stable captured picture, no corrugated black screen, clear image edge and accurate restoration of the real information of the image5. The ultra-high-tech aluminum magnesium zinc alloy box is harder than aluminum and more corrosion-resistant than iron.6. Multifunctional connector, fast, simple and convenient.

The First Sill of Small Spacing LED Display Screen Entering the Room: "low Light and High Gray"

Indoor small spacing LED is an emerging market, which is bound to face the lack of current industry standards, which causes many manufacturers to blindly launch products that do not meet the actual requirements. The market will follow the law of survival of the fittest, and users will be able to make the right choice. Low brightness and high gray is undoubtedly the first threshold for small spacing LED display to enter the room."Low brightness and high gray" is the threshold for LED entryIn the field of indoor display, most of the traditional LED displays are used for advertising display or information display. With the gradual maturity of small spacing LED display products, the application field of LED display expands rapidly. The commercial display, conference display, command and control, dispatching and monitoring covered by indoor display may become the market of small spacing led. This market may have a scale of tens of billions of dollars a year in the future.Facing the temptation of the market, LED display manufacturers swarmed in. Major LED display listed companies have successively released their small spacing LED products: Large-size "LED TV" of lyade, "led super TV" of Zhouming technology, LianJian photoelectric micro dense LED display "and so on. Although they have different names, they are essentially small spacing LED display screens. In addition to these listed companies, there are many companies optimistic about the indoor small spacing LED market and ready to test the water in the industry.Figure: 144 inch LED TV launched by RiadHowever, does the current specification of small spacing LED display meet the needs of indoor applications? Simply move the LED display directly from the outside to the inside? Great changes have taken place in the application environment of the products. The hot headed LED screen manufacturers need to think about whether the design of the LED display product itself also needs to be changed according to the application environment?Therefore, if a small spacing LED display with a nominal brightness greater than 1200 CD / is directly applied to the indoor environment, there are only two results: either high brightness damages the user's eyes, or reducing the brightness while losing the gray level and image quality, which are not the desired results of the user.To solve this problem, it is necessary for our display manufacturers to upgrade the current small spacing display screen and develop a small spacing LED display screen with "low brightness and high gray". The so-called low brightness and high gray is specifically explained as follows: when the brightness range of small spacing LED display screen is in the range of 100 CD / - 300 CD / , the gray level of the display screen is not lost, or the degree of gray level loss is within the range that is difficult to be perceived by human eyes.The characteristics of low brightness and high brightness of LED display screen are related to the chip, drive, control and other links of display screen. Therefore, display manufacturers need to devote themselves to research and development in order to make a display truly suitable for indoor environment applications. We are also pleased to find that small spacing LED displays with low brightness and high gray have appeared in the market. Among the products we tested, there are small spacing products with excellent performance. When the brightness reaches 100cd / or even below, the gray loss is difficult to distinguish with the naked eye, and the image quality restoration is very good.Therefore, low brightness and high gray is a threshold that led display manufacturers must cross to enter indoor display applications. Low brightness and high gray will be one of the key factors to distinguish the high and low quality of LED display with small spacing. For products with small spacing, the competition of LED display screen will no longer compare whose brightness is high, but whose brightness is low. Compared with whose display screen can reduce the brightness without losing gray and image quality. In other words, only the small spacing LED display with low brightness and high gray is a good product that meets the requirements of users and has competitive strength.Indoor small spacing LED is an emerging market, which is bound to face the lack of current industry standards, which causes many manufacturers to blindly launch products that do not meet the actual requirements. The market will follow the law of survival of the fittest, and users will be able to make the right choice. Low brightness and high gray is undoubtedly the first threshold for small spacing LED display to enter the room.One of the most significant differences between indoor and outdoor applications is the change of ambient light. When the LED display is used outdoors, the intensity of sunlight during the day is very high. Therefore, the brightness of the outdoor LED display needs to be highlighted, re lit and super bright! The higher the brightness of the display, the higher the technical specifications of the display.However, after the small spacing LED display screen enters the room, the application conditions have changed greatly: first, the brightness of the indoor environment is greatly reduced; Secondly, compared with the traditional users of LED display screen, small spacing LED products also quickly and greatly shorten the viewing distance between the display screen and users; Another notable feature is that users in indoor conference, command and control and monitoring rooms will continuously pay attention to the screen for a long time.Under the indoor dark environment, human eyes look at the high brightness small spacing LED display screen for a short distance and a long time. The unique high brightness of LED often makes people feel dazzling, and even causes eye pain, tears and reduced vision. Therefore, the brightness of LED display screen is too high, which will bring visual fatigue to users of indoor applications, and even cause irreparable eye damage! It can be said that the brightness of small spacing LED display screen is definitely not the higher the better. Its brightness must be reduced.

Price Analysis of P1.5 Small Spacing LED Display Screen

1 P1.5 definition of small spacing LED displayThe common models of indoor full-color LED display with pointing spacing of 1.5mm include p0.8, P1.2, P1.5, P1.6, p1.8, P1.5, P1.5 and P1.5, of which 1.5 is the most common. Up to the current position, P1.2 has been made in China. P0.8 is still in the laboratory, in the research and development stage, and has not been mass produced.Now it gradually replaces LCD and DLP and plays a more and more important role in the fields of security monitoring, video conference, radio and television media. It is the current display device. According to industry analysis, the market share will reach 100 billion yuan in the next few years.2 P1.5 advantages of small spacing LED display1. Indoor P1.5 display screen is a high-definition LED display with ultra-small spacing and high pixel density, which is suitable for indoor ultra-high definition close viewing display;2. P1.5led has wide color gamut, uniform color, high contrast, high gray and high brush, radio and television grade, super stability;3. Advanced R & D technology and reliable components ensure its excellent high gray scale and high refresh rate;4. P1.5 the 160 ultra wide viewing angle of the display screen enables the viewer to obtain high-quality display effects at various angles;5. P1.56 the display screen can be spliced in any direction, size and shape, presenting a perfect seamless visual effect;6. Die cast aluminum frame design, ultra light and ultra-thin screen, space saving, cost saving and fashionable and beautiful;7. P1.5 full color LED display is made of die-casting aluminum, which improves the heat dissipation performance and prolongs the service life of the box;8. High reliability, long service life and low maintenance cost.Luminous color luminous intensity main wavelengthLed model smd1010Point spacing 1.5mmPixel composition table paste three in one 1R1G1BModule weight 0.4KGModule power consumption 70WBox area: 0.12m2Box weight 4.6kgBox material: Die Cast AluminumInstallation method: fixed installationScreen parameter P1.5 small spacing LED displayPoint density 360000 points / m2Horizontal view / vertical view 160 / 160 Deviation of center distance between luminous points 3%Brightness uniformity 98%Chromaticity uniformity within 0.003cx, CYContrast 5000:1Protection grade ip60Application siteSystem control parametersColor processing bit 16bitGray level 65536Driving mode: constant current driveScanning mode 1 / 30Frame change frequency 50 / 60HzThe color temperature of the screen is adjustable from 3200K to 9300kBrightness adjustment manual / automatic / program controlCorrection supports point by point correction of brightness and chromaControl mode synchronous controlP1.5 small spacing LED display screen with control distance less than 100m super category 5 twisted pair cable100m 500m multimode optical fiber500m 10km single mode optical fiberInput signal mode AV / CVBS / VGA / DVI/HDMI/SDI/DPVideo playback capability 2K HD, 4K UHD pictureScreen operation parametersAverage Power 350W / m2Working voltage AC: 110V 240V (50 / 60Hz)Safety characteristics gb4943 / en60950Signal to noise ratio 47Blind spot rate 0.3 10-4, 0 when leaving the factoryOut of control rate: out of control rate of whole screen pixels 0.3 10-4, 0 when leaving the factoryRegional pixel out of control rate 0.3 10-4, 0 when leaving the factoryTypical service life of LED: 50000 hoursThe operating environment humidity is 10% 90% RH, and there is no condensationApplicable standards CCC, FCC, lvd-ce, emc-ce, etc4 P1.5 price analysis of small spacing LED displayMainly from the following aspects:1: The screen body can account for more than 60% of the total investment of the project. The LED small spacing screen body is composed of display module, power supply, box body and flat cable power line.2: The control system here adopts the model 8000c2.0 of Wittem and the main control box to send signals to each screen to control each pixel: * DVI output, RJ45 / optical fiber connection interface. * gigabit network card, DVI transmission* 2 output port, supporting maximum resolution: 1024 * 1280. * standard main control box and mini main control box.3: The most basic accessories for installation are: computer (desktop computer), power distribution cabinet, audio power amplifier (optional), video processor (optional), etc.4. The main function of air box is more convenient packaging and transportation