Discussion on the Contrast of Outdoor LED Display Screen

introductionDirect looking light emitting diode (LED) technology is the mainstream technology used to realize outdoor digital identification system, but the development of this technology also brings many interesting challenges to measure and evaluate contrast. When people choose suitable devices in a variety of display technologies or multiple display manufacturers for a specific purpose, like several other important display parameters, contrast is also a key consideration.

Discussion on the Contrast of Outdoor LED Display Screen 1

Most people in the display industry agree that few end-users can really understand the impact of image brightness, gamut breadth and fidelity on the contrast of the display. However, the fierce competition in comparison among liquid crystal display (LCD) consumer manufacturers with television as the main consumer goods has not slowed down at all. With the different test methods associated with the variability of test variables, the contrast index published by the manufacturer can appear almost any value. However, the space for the actual change of contrast is limited. At present, dynamic contrast ratio specifications have become more and more common and gradually accepted by people.

Not only the consumer display manufacturers, driven by the sales pressure of the consumer display market, the major LED display manufacturers are also facing great competitive pressure in terms of contrast. This is especially true for the outdoor LED display industry, because when selecting products, end users always first consider the contrast technical indicators of the product, even if they may not fully understand the significance of various variables in the test environment and real viewing environment of outdoor display.1. Components of large-size LCDIn order to better talk about the theme of this paper, it is necessary for us to understand the basic unit of large-size LED display screen - LED module. By arranging the modules in the prefabricated frames, then assembling these frames together, and finally coordinating the power consumption and signals between them, a display screen of any size and resolution can be formed.

For example, the display screen of the Royal Kansas baseball team is 85 feet wide and 105 feet high. It is composed of 36 parts and 5940 LED modules, with a resolution of 1584 1800 pixels, as shown in Figure 1.Figure 1 the HD display screen located in the major league baseball field is composed of about 6000 LED modulesThe mechanical parameters of the front surface of LED module are the key factors affecting the off state test of display screen. Although the design and manufacture of LED display screens of different companies will vary to some extent, most companies have invested a lot of energy to improve the "video black" state of the display screen from all aspects, as shown in Figure 2.

Figure 2 the LED module is equipped with a sunshade, which is often used to improve the contrast of outdoor identification systemIn most LED modules, the light shield is the last part to be installed. This component called "light shield" is a shutter assembly. It is fixed and installed only after the basic module is assembled. This component is very important for the measurement of brightness performance in off state. The name of the light shield comes from its ability to protect the LED panel from sunlight.Generally speaking, the less sunlight directly reflected by the display screen, the higher its total contrast. For most outdoor devices, they are exposed to the sun most of the day, so the manufacturer must strictly design the sunshade to ensure that the display can work normally. The design of the sun visor is also a job to find the best balance between the display contrast and the viewing angle.

Discussion on the Contrast of Outdoor LED Display Screen 2

In addition to the sunshade design of the LED module, the texturing approach of the sunshade surface will also affect how much ambient light will eventually be reflected into the eyes of the observer. Generally speaking, this is related to the processing method. The difference between rough surface and semi smooth surface is that it will more effectively reflect the ambient light in the way of diffuse reflection, which provides a darker off state for the audience, so as to improve the uniformity of the contrast of each viewing angle of the display screen. In contrast, the polishing coating treated in the last process is dim when viewed from the direction of light incidence angle, so it can theoretically enable the manufacturer to provide higher contrast. However, the coating will produce serious glare in the direction of reflection angle, which will affect the effect of side angle viewing.

The methods to realize the sunshade design and rough face mask mostly adopt the coating approach. Many but not all LED display manufacturers use anti reflection and anti ultraviolet (UV) black paint to treat the surface of LED module sunshade, trying to further reduce the reflection of light on the surface of LED module. External environmental conditions also have an important impact on the total contrast of the display screen. After the display screen is used for a long time, if it is not cleaned regularly, a large amount of dust and dirt will accumulate. After a certain time limit, it will begin to affect the total contrast of the display screen and gradually turn the "black" state into brown. At present, several methods to clean up dust and dirt have been introduced, and its actual effect remains to be verified. Another challenge for display manufacturers and users is to deal with the impact of ultraviolet light on the front surface of the display. The anti UV coating or plastic on the front surface of the display helps to minimize this impact.

Finally, each LED tube will be 1 3mm higher than the surface of the display screen, which will also reduce the contrast performance of the display screen.

The intensity of light reflected from each LED has a certain relationship with the LED size and the color of the LED epoxy shell. Each LED contains a reflector for focusing light, and this reflector will also reflect various ambient light entering the LED. Therefore, each LED itself may reduce the overall contrast of the display screen. Fortunately, however, LED manufacturers have adopted the optimized design of only one red LED, one green LED and one blue LED pixel by improving power efficiency and brightness. For the LED display screen produced in the past, according to the design of louvers and the surface texture treatment at that time, each pixel must contain 12, 8, 6 or 4 LEDs to provide sufficient light intensity (as shown in Figure 3). However, the continuous progress of LED technology has greatly improved the contrast of the display screen.

Recently, a new operation method in the LED video industry is to use the so-called black LED package to improve the contrast of outdoor light LED video display. Most red, green and blue outdoor light LEDs add more red, green and blue dyes to epoxy resin packaging materials to effectively improve color discrimination and display contrast. The so-called "black encapsulated" LEDs, in short, just add some more dyes to color them, making them slightly darker rather than blackening. Because more coloring dyes are added, the black LED package does maximize the overall display contrast, but at the cost of increasing power consumption and sacrificing display brightness. The difference between standard led and black LED can be seen by comparison in Figure 4.

Figure 4 difference between standard LED (upper row) and black LED (lower row)

It should be added that all contrast enhancement methods should not only be coordinated in a unified way in the production process of a batch of modules, but also coordinate all modules within an appropriate time range. Some consumer groups will regularly require the coordination and calibration of the module after the display has been used for 5 10 years. The normal working life of LED video display screen is generally 75000 100000 hours. At the end of the service life, the company needs to provide 11 years of support to ensure that the contrast remains unchanged, which needs to be planned at the beginning of each project.

2 variables affecting contrastUnderstanding the design of outdoor LED display and how it affects the contrast is of great help to deeply understand the variables that will affect the contrast test of this kind of products. As mentioned earlier, the contrast of outdoor large-size LED video display screen greatly depends on the construction method of the module described previously, including the design of louvers, texturing, coating and led density.

In order to make the contrast test meaningful and repeatable, it is necessary to prepare a completely dark darkroom to eliminate the interference of external light. In contrast test, LED module, test instrument and light source are the three key factors of interaction. Most LED display manufacturers will only do a basic on-off test process, and its off state corresponds to video black. However, there is no unified test technical standard in the whole industry. Although there are some legal standards for measuring contrast for some display technologies, such as VESA FPDM (Video Electronic Standards Association flat panel display test), it is not fully applicable to the LED industry. Different from flat panel display measurement, the ambient light source (sun) and measurement tools (viewer) are changing every moment of the day, and the pedestrians driving or walking are also changing every minute. This is difficult to repeat in the test and explain clearly in a product manual.

It should also be noted that under the test conditions, compared with the large-size complete LED display screen, it can only be tested on a single module or a collection of modules.In the measured environment, the ambient light is an artificial light source to reproduce the real outdoor viewing environment. Obviously, adjusting the brightness of the light source in the test environment (in Lux) will greatly affect the test results, which can be used to enhance the advantages of product publicity. Since the sunlight on the surface of the display screen itself is changeable, any result can be considered reasonable.At present, in the instructions published by the display manufacturer, the ambient brightness range is 40 50000 lux.

The contrast test results can also be improved by adjusting the angle of the light source relative to the display module. As mentioned earlier, the LED module will have horizontal shutters, namely sunshades, distributed between each row of LEDs or each row of pixel points. Increasing the angle of the light source relative to the LED can create a larger shadow area on the module surface, so as to finally improve the black field state of the display screen.Finally, as mentioned earlier, the display manufacturer can also provide convenience for controlling the final contrast parameters by adjusting the angle of the test instrument relative to the display surface. It should be noted again that this may also be the result of the interaction between the light source and the horizontal sunshade.These three basic variable factors - light source intensity, light source angle and test instrument angle - jointly determine the final published LED display contrast. Unless the tests of different displays are unified, it is not appropriate to compare the test results of different products. Therefore, the contrast specification published by the display manufacturer does not have much practical significance (as shown in Figure 5).

In the real viewing environment and test environment, the three variables of light source intensity, light source angle and test angle still have a certain correspondence. The condition of the sky has a great influence on the intensity of sunlight on the surface of the display screen. The angle of sunlight on the surface of the display screen at different times of the year and at different times of the day

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Analysis of Data Transmission Mode of Outdoor LED Display Screen
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Outdoor LED display is widely used in the release of various live information. Is there a more convenient way to update the display data in real time?As a new information medium, LED display has outstanding advantages in performance. It has long service life, fast response, simple drive and stable performance, so it has been widely used in various fields of society. For example, expressway uses LED display screen to release road condition information in real time; Stadiums and gymnasiums use LED display screen to announce the live situation in real time and so on. How can these real-time information be quickly released to the scene?Figure 1 outdoor LED displayAt present, the data transmission of outdoor LED display can be carried out in the following ways:Staff use portable computers to update data at the equipment site. The disadvantage is that it is difficult to update the display data in real time, find the faults of LED display screen in time, increase the labor intensity of staff and increase the labor cost of enterprise operation.The LED display screen is connected to the Internet through the Ethernet line to communicate with the server-side computer connected to the Internet, and the computer is used to transmit data to the LED display screen through the Internet. This method requires Ethernet cabling, which has the disadvantages of inconvenient installation and expensive maintenance cost.The control of LED display screen is realized through short message. The disadvantage of this data transmission method is that it is difficult to edit short messages and the amount of data transmitted is relatively small. At the same time, the transmission of short message also has a certain time delay, which is difficult to ensure the real-time performance of data, especially in the occasions where real-time information display is required, such as road traffic, stadiums and gymnasiums.The LED display screen is controlled through the mobile communication network. The advantages of this data transmission method are simple installation, fast speed, not limited by time and space, and can update the display data in real time. Therefore, the use of mobile communication network has become an ideal choice.The system for remote control of LED display screen based on GPRS network is shown in the figure. The system consists of LED display screen, GPRS DTU, host computer server software and so on. In this scheme, the only requirement for the LED display controller is that it needs to have RS-232 or RS-485 communication interface.Figure 2 GPRS Remote Control LED display schemeZwg-20ie is a wireless data transmission device (DTU) based on GPRS network, which provides users with high-speed and fully transparent data channel. It is simple to use and stable and reliable. At the same time, zwg-20ie has the design of large buffer area and adopts dynamic partition technology to meet the transmission requirements of different data volumes.Figure 3 zwg-20ie GPRS DTUGPRS wireless data transmission equipment transmits data through the Internet. The upper computer server of LED display screen needs to be connected to the Internet to communicate with GPRS wireless data transmission equipment. The host computer server can connect to the Internet by using static IP or dynamic domain name. If the host computer server of LED display screen is in the LAN, it also needs to do port mapping on the router.In this application, zwg-20ie is the client of network equipment, and the host computer software controlling LED display screen is the server. The host computer software can communicate with the client through standard socket network programming.Figure 4 LED display screen adopts zwg-20ieGenerally speaking, manufacturers producing LED display controller will provide an upper computer software based on RS-232 interface, which communicates with LED display controller through serial port. In view of this, we provide a virtual serial port software to directly virtualize zwg-20ie into a "wireless serial port", Users can use it directly without modifying the existing upper computer software based on RS-232 interface.
With a Local IPhone Repair, You Have a Quicker Service at Your Disposal
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Brief History of Notebook Display Chip
Brief History of Notebook Display Chip
With the current notebook display performance becoming more and more powerful, 3D display performance has become one of the important links to pay attention to in the purchase of notebook. But you should know that the status of notebook display performance is not as obvious and important as desktop computers, because the main function of notebook is mobile office, which requires portability and battery life. Let's take a look at the current display chip of notebook. Among the display chips used in early notebook computers, neomagic is famous. The company has disappeared in the notebook market, but it is the king of early notebook graphics cards. At that time, the display chips produced by neomagic were adopted by many large manufacturers. The display chips launched by neomagic include "magicgraph 128" and magicgraph 128v (in 1996, video acceleration processing was added), magicgraph 128zv (in 1996, TV-out and other functions were added), magicgraph 128xd (in 1997, XGA and 3D acceleration were supported), magicgraph 128zv (1998), magicgraph 256av (AGP), magicgraph 256zx (AGP) In 2000, neomagic began to decline and gradually faded out of the display chip market. However, many notebooks in the second-hand notebook market now use neomagic display chips, such as IBM's most classic 600 Series (IBM 600: magicgraph 128xd 2m PCI; IBM 600E: magicgraph 256av 2.5m AGP; IBM 600X: magicgraph 256zx 4m AGP) Just use the neomagic display chip.At the same time, Trident display chips are also very popular, such as Trident 9388 and 9525, which have good effects on video playback and DVD playback. At present, the famous notebook computer manufacturers using Trident chips in the market are mainly NEC and Toshiba The portege2000 series of Toshiba notebooks, which were known as the thinnest notebooks in the world at that time, and the R100 launched soon used Trident's display chip.Cyberblade xp4 is the first mobile graphics chip using 0.13 micron manufacturing process in the industry. Xp4 graphics chip is suitable for high-end, mainstream and ultra-light and ultra-thin notebook computers at the same time. However, the actual 3D performance is poor, which is difficult to see except in a few products. The name of S3 company should be familiar to everyone. In fact, in the early notebook market, S3 display chip is still very strong, and the most famous is savage / IX graphics acceleration chip.At that time, this chip combined the industry's fastest 3D engine, integrated memory architecture and excellent support for digital audio, bringing "desktop comparable" to notebook computers The most famous model equipped with S3 display chip is IBM's t2x series. Among them, the classic model T23 uses supersavage IXC launched in cooperation with via. Unfortunately, S3 can no longer be seen in the notebook market. Other early notebooks show that chip manufacturers chips and technologies (now acquired by Intel) and silicon motion lynx have been hard to find in the market. Only in the second-hand notebook market can we know that they are still "alive". In short, the performance of early notebook display chips was not very good, especially the support for 3D effects, but one manufacturer was an exception, that is ATI. 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What Is the Protection Level of LED Display Screen and What Is Its Significance
What Is the Protection Level of LED Display Screen and What Is Its Significance
Whether it is conventional LED display screen or LED flexible screen, the protection level is a more important technical index. So what is the degree of protection and what is the significance?IP protection level is composed of two numbers. The first number indicates the level of dust prevention and foreign invasion of LED display screen;The second number indicates the tightness of LED display screen against moisture and water intrusion. The larger the number, the higher the degree of protection.The meaning of the first numeric code0: no protection1: Prevent large solid intrusion2: Prevent the intrusion of medium-sized solids3: Prevent small solids from entering4: Prevent solid objects larger than 1mm from entering5: Prevent harmful dust accumulation6: Completely prevent dust from enteringThe meaning of the second numeric code0: no protection1: Water drops into the shell have no effect2: When the housing is tilted to 15 degrees, the water drops into the housing have no effect3: Water or rain has no effect from the 60 degree corner to the shell4: The liquid splashed on the shell from any direction has no harmful effect5: Rinse with water without any harm6: It can be used in the cabin environment7: It can withstand immersion in a short time (1m)8: Immerse in water for a long time under a certain pressureFor example, the LED display is marked as IP65, indicating that the product can "completely prevent dust from entering" and "can be washed with water without any harm"Zhengzhou Hengyuan Optoelectronics (Zhengzhou Hengyuan display equipment Co., Ltd.) was established in 2007 and is the general distributor of lyade LED electronic display screen in Henan. Liyade Henan Branch, after more than ten years of development, the company headquarters has established a large spot warehouse in Zhengzhou Zhongli advertising market, and built Zhengdong center in Zhengdong New Area, with Flagship Exhibition Hall, office area, etc. It also has branches in Hohhot, Lanzhou, Xining, Yinchuan, Lhasa, Shandong and other cities. The company is mainly engaged in LED display screen, and its agent brands include: liad (the market value of LED display screen ranks first in the industry), Shanghai yangbang control card, Xi'an Nova control card, Changzhou Chuanglian power supply, hy full-color power supply, distribution cabinet, video processor and other LED display screen peripheral supporting products. Channel products, indoor, outdoor, small spacing 1.8, 1.5, 1.2, all-in-one conference machines are available.
Cob Display Screen Packaging Process
Cob Display Screen Packaging Process
Cob encapsulated LED display screen has good appearance, excellent image quality and strong protection. All these characteristics are attributed to its packaging method cob.Cob packaging is to directly package the light-emitting chip on the PCB. The packaging process flow of a cob display screen is as follows: cleaning PCB --- dropping adhesive --- chip bonding --- testing --- sealing black adhesive heating and curing --- testing --- warehousing1. Cleaning PCB board: cleaning the board is to improve the quality of bonding. There are stains or oxide layers on the cleaned PCB board. After testing and positioning, clean it with a brush or air gun before moving to the next process;2. Drop adhesive: two methods are usually used for adhesive connection, one is pressure injection, the other is needle transfer;Pressure injection method: fill the glue into the container, apply air pressure and control the injection diameter.Needle transfer: a rapid dispensing method. Take out the glue from the container with a needle and apply it on the PCB board;The purpose of dropping adhesive is to prevent the chip from falling off during bonding.3. Chip pasting: chip pasting is also called solid crystal. This process requires preciseness and must be "stable and positive". Note that the chip cannot be pasted reversely;4. Bond line: the purpose of bond line is to link electrical and mechanical. Each company does different tensile tests, which can be carried out according to the company's standards. Handle the bonding line with care, and assign special personnel to check its correctness every two hours;5. Glue sealing: during the glue sealing process, check whether there is silk dew during dispensing, whether there are pores on the surface, and whether the black glue is cured. Packaging has strict requirements for technicians, and the process must be strictly controlled;6. Testing: undesirable phenomena may occur in the binding process and are not easy to be found, so chip level packaging should be tested for performance; There are two ways of detection: non-contact and contact.Non contact inspection is mainly visual inspection, which is also the basic inspection technology that cob technicians must master. However, whether it is non-contact or contact, the two should be complementary rather than alternative.lw
Detailed Analysis of Point Spacing and Sight Distance Calculation of LED Display Screen
Detailed Analysis of Point Spacing and Sight Distance Calculation of LED Display Screen
LED screen is a new media technology just emerging in the world in the 1990s. Compared with other technologies, LED screen has the inherent advantages of energy conservation and environmental protection, bright color, stable display and wide visual range, which makes it quickly applied in many fields. In particular, it has the characteristics of high brightness, large picture and long service life, which makes it quickly obtain an almost irreplaceable position in the field of outdoor display.However, the LED screen also has a natural "defect", that is, the pixel spacing is too large and the picture is not delicate enough. Generally speaking, it can't stand a close look. This is why LED screens are mostly used to watch distant stages, squares and other places. This fatal defect makes the LED screen unable to compete with LCD and other displays in terms of picture fineness, so it rarely sets foot in indoor display.In recent years, with the progress of technology, LED display technology has also made great progress. The most gratifying thing is that led screens with smaller pixel spacing have been continuously developed. The LED screen has a smaller pixel spacing and makes the picture more delicate, so that the LED display is suitable for close viewing, and can bring video wall level resolution and image quality.Calculation of point spacing and sight distance of LED screen1. Calculation method of point spacingThe center distance from each pixel point to each adjacent pixel point; Each pixel can be one LED lamp [such as PH10 (1R)], two LED lamps [such as PH16 (2R)], and three LED lamps [such as PH16 (2R1G1B)]. Point spacing of p16: 16mm; P20 point spacing: 20mm; The point spacing of p12 is 12mm2. Length and height calculation methodPoint spacing Points = length / heightFor example: PH16 length = 16 points 1.6 cm = 25.6 cm, height = 8 points 1.6=12.8PH10 length = 32 points 1.0 cm = 32 cm, height = 16 points 1.0=163. Calculation method for number of modules used in screenTotal area module length module height = number of modules usedFor example, the number of modules used for 10 square PH16 outdoor monochrome LED displays is equal to:10 M2 0.256 m 0.128 M = 305.17678 305 PCsMore accurate calculation method: the length uses the number of modules Height: number of modules used = total number of modules usedFor example, the number of modules used for PH16 monochrome LED display with length of 5m and height of 2m:Number of long use modules = 5m 0.256 M = 19.53125 20Number of high use modules = 2m 0.128m = 15.625 16Total number of modules used = 20 16 = 3204. Calculation method of visual distance of LED display screenRGB color mixing distance the distance that three colors are mixed into a single color: LED full-color screen viewing distance = pixel spacing (mm) 500 pixel spacing (mm) one thousandThe minimum viewing distance is the distance that can display smooth images: visual distance of LED display = pixel spacing (mm) one thousandThe most appropriate viewing distance is the distance that the viewer can see a highly clear picture: the best viewing distance of LED display = pixel spacing (mm) 3000 pixel spacing (mm) one thousandFurthest viewing distance: furthest viewing distance of LED display = screen height (m) 30 (Times)
Application Analysis of Splicer in 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.
Circuit Design of Using Driver Chip to Quickly Improve the Image Quality of LED Display Screen
Circuit Design of Using Driver Chip to Quickly Improve the Image Quality of LED Display Screen
Solution: average the pulse of output current in the same time PCB should be more than 4 layers, and the shorter the wiring part, the better VLED and VCC are separated into different power supplies add a large voltage stabilizing capacitor to the ground terminal of VLED and VCCNowadays, LED display is more and more widely used. Its footprints can be seen in financial securities, sports, traffic information, advertising transmission, etc. because of the decline of LED cost and the improvement of brightness in recent years, coupled with the advantages of less power consumption, long service life, large viewing angle and fast response speed.Moreover, the corresponding sizes can be customized according to different locations and needs, and quickly rise into the darling of a new generation of communication media in the market. Its conditions are unmatched by other large-scale display devices. This paper will further explain how to realize high-quality LED display without changing the circuit design and using the rapid response advantage of the driver chip.Overall speed improvement - higher refresh frequency and frame change frequencyThe LED is driven by the current flowing, and the brightness and gray of the LED can be controlled by the pulse width. In short, if the design of the system end is not considered, the refresh frequency is determined by the addressing time (TACC) and the current speed flowing through the LED; The improvement of framerate requires faster addressing time in addition to the support of the system, and there is a strong positive correlation between addressing time and transmission frequency (DCLK) and addressing number.For example, there is a full-color outdoor display screen whose addressing number is 768. If different frequencies are used, the overall addressing time will be different. The working frequency is 10MHz - > 768x0.1us = 76.8us, and the working frequency is 30MHz - > 768x0.033us = 25.6us. The addressing time difference between the two is three times.The speed of current flowing through the LED determines the refresh frequency of the LED display screen. For example, if an LED display screen has 768 addressing numbers, 30 MHz working frequency, 8 bits for gray scale adjustment, 2 bits for brightness adjustment, and 4 US interval for each subfield; The pulse width displayed by the traditional driver chip is 250ns, while the pulse width of snapdrivetm driver chip is 50ns. There is a significant difference in the refresh frequency between the twoIt shows that the gray scale is improved. At present, the OE response time of the common traditional driver chip in the market is about 250ns. If the above example is used, the highest gray scale is 8 bits; That is, R, G and B each have 256 gray scales. Its color is 256x256x256 = 166777216, about 16 million colors. If you want to increase the gray scale to 14 bits, that is, 16384x16384x16384 = 439 billion colors; The refresh rate between the two will also be significantly different The following are the test conditions and results of the driver chip including snapdrivetm Technology launched by Taiwan Xunjie technology. It can be clearly seen from figures 1 and 3 that the output current of the driver chip is still linear under the very small OE pulse width, while the traditional driver chip cannot provide linear output.Test conditions: VCC = 5V, IOUT = 38.3ma, RL = 47 , CL = 13pf Reduction of distortion rate for drive chips with different output current slopes, we get different results in distortion rate by using simulation software (hspice2007). Simulation conditions: traditional drive chip: ton: 160ns, TOF: 70ns, snapdrivetm drive chip: ton: 15ns, TOF: 15ns, VIN: 5V, IOUT = 20mA, LED equivalent circuit RL: 52 , CL: 10PF, OE pulse width: 250ns To solve the problem of LED heat and increase the service life of LED, as shown in Figure 5, the current output diagram of 50% dutycycle is shown. If the current pulse is dispersed evenly at the same time, it will not affect the output current and LED brightness, but also avoid the phenomenon of LED overheating and early attenuation of service life caused by long-time lighting of LED. Fast response circuit design uses fast response driver chip, although it can improve the gray scale and refresh frequency of LED display screen; However, according to the formula of inductance effect V = l di / dt becomes smaller due to time t; Relatively speaking, the instantaneous voltage increases, so it is easy to produce surge. The author listed several ways to improve the circuit design for readers' reference: 5: Variation of voltage L: parasitic inductance on the circuit Di: differential of current DT: differential of timeThere are several points to pay special attention to in circuit design:1. PCB should preferably be more than 4 layers, and the power supply and ground should be independent on one layer; The shorter the routing part, the better. 2. Add a large voltage stabilizing capacitor to the ground terminal of VLED and VCC. It is recommended that CP1 and CP2 be 1000 1500uf. 3. VLED and VCC are separated into different power supplies. 4. RC circuit can be added to the frequency input (clock) to reduce its peak value and reduce the impact on electromagnetic interference; It is recommended that RT Related Description: OE: chip output enable pin. Snapdrivetm: a fast response driver chip developed and produced by Taiwan Xunjie Technology Institute. Its pins are fully compatible with tb62746 and other products.
Technology Grafting of LED Display Screen and VR / AR
Technology Grafting of LED Display Screen and VR / AR
In the collection of famous sages of the Song Dynasty, there is a saying: "a thousand cups of wine meet a confidant, and a half a sentence is more than speculation." but "no words to talk" is the most embarrassing. Therefore, it is particularly important to accumulate negotiation funds.People change every day, and the industry is no exception. With the development of LED display industry today, technology is changing and the focus of attention is also different. So, what is the hottest topic in the LED display industry today? Let's have a look.In 2016, the hottest black technology is virtual reality (VR). VR technology provides an unparalleled immersive experience and sense of substitution, turning users from bystanders to participants. It is widely respected in professional audio-visual, radio and television, movies, games and other fields. The rapid rise of VR industry has attracted domestic LED display enterprises to enter the VR field one after another.ImplementationLyad and Sichuan University Zhisheng signed the strategic cooperation agreement on "virtual reality technology innovation and application". We will jointly study the integration and application of LED small spacing display technology and VR technology; At the same time, participating in the official VR organization - China virtual reality industry alliance, and cooperating with Lifeng culture, Jin Lixiang, digital tiger image and other domestic front-line cultural tourism, dance beauty and digital performing arts companies, which are also liad's strategic partners, are committed to the in-depth development of the virtual reality cultural tourism industry. In addition, Riad: the wholly-owned subsidiary also invested in the well-known augmented reality company magic leap to accelerate the integration of the existing VR / Ar / MR fields.LianJian optoelectronics took the lead in technical cooperation with a well-known domestic virtual reality system product and application development company, and jointly studied the vr virtual display system solution based on LED small spacing display technology, mainly relying on various new military schools, driving schools, medical schools, sports schools, etc. of virtual reality technology. The training system supported by virtual reality technology enables military personnel, aircraft pilots, air traffic controllers and sports athletes to easily obtain perceptual knowledge and practical experience in a safe virtual environment.Abison plans to invest US $4.5 million to acquire 51% equity of artixiumdisplay Ltd. with the certification qualification of artixium, abison's technical reserves and LED display manufacturing capacity will be combined with artixium's technology to accelerate the development of virtual display market. In the future, with the help of virtual display technology, the company also hopes to further develop cooperation in stadium advertising and other aspects, and will take advantage of the trend to enter the field of "VR sports".Cross border transformation of led enterprisesWith the homogenization of LED products and the intense price competition, the industry is facing an unprecedented embarrassment. However, some listed companies in the LED industry have significantly improved their business performance by creating double main businesses and expanding new fields. At the same time, the performance of most led enterprises has declined to varying degrees, and the performance of some companies actively seeking change is indeed increasing. Of course, the most fundamental reason is this Some companies have embarked on a transformation path suitable for their own development. Not long ago, Qinshang optoelectronics detonated the industry's attention to cross-border transformation through direct M & A.ImplementationAlto Electronics: LED financial servicesLianJian optoelectronics: LED Digital MediaLehman shares: LED SportsRiad: LED cultureDiligent optoelectronics: LED educationLED display enterprise marketing channel constructionWith the gradual popularization of LED display prices and the continuous penetration of applications into commercial and civil fields, the market needs to rely on continuous and large-scale growth. In addition, with the increasing saturation of LED display market in first tier cities, in order to open up emerging markets, some LED display enterprises gradually enter second, third and fourth tier cities. Since the vigorous layout of vior video and abison last year, channels have become more and more popular All kinds of LED display screen manufacturers must compete.ImplementationZhouming Technology: in 2016, Zhouming technology further deepened the cooperation with some excellent channel providers, and the channel providers were upgraded to regional operators. They will increase the responsibilities of regional brand promotion, technical service, regional expansion and regional operation on the basis of the original product marketing and project operation, so as to realize the real seamless integration between regional operators and Zhouming's domestic marketing team Greatly improve the communication efficiency of Zhouming technology to the market, and enhance the brand coverage and marketing support of Zhouming technology in the country.Liad: in 2016, it will deeply cultivate market channels. Liad's outstanding advantages in brand, led original technology, independent intellectual property rights, operation management and marketing service network will be able to provide channel partners with rich shared resources such as all-round operation, market publicity and promotion, technical support and so on.Abison: in 2016, it began to increase investment and development efforts in the domestic market, especially in channel construction and key customer development. It has successively signed channel strategic cooperation agreements with Shenyang Hailian electronic technology, Shaanxi Lianchuang electronic technology, Inner Mongolia Huahai Jucai and Wuhan Huashang technology. Abison said that it will continue to actively expand Provincial operators in the future to sell in the domestic market The sales scale will gradually increase.The LED control system wants to open the source code to the LED screen factoryLast year, lingxingyu, a manufacturer of LED control system, announced that it would open the source code and authorize the screen factory to produce and accept the system by itself. Lingxingyu will change from a system manufacturer to a solution provider, so that the screen factory can better design its own products, get rid of homogenization and realize functional innovation. In recent years, the LED display screen is looking forward to further technological innovation, but whether to open the source The code has become what led display enterprises expect.ImplementationAt present, the process of opening the source code of LED control system to LED display factory is not ideal. Only a few enterprises say they will open it, but the specific implementation measures are not clear, and more LED control system manufacturers still maintain a negative attitude.
Best Laptops for Students: the 12 Inch Touchscreen Laptop
Best Laptops for Students: the 12 Inch Touchscreen Laptop
The introduction of 12 inch touch screen laptopTo write better, the world needs more people who are able to read the right information and write the information correctly. People are having to write lots of text because they don't have time to write and make all the text. So, the people who can write the most with a lot of information need to be hired to write that information and not just edit it for themselves. For example, if the students don't understand how to type correctly then they can use Google Apps to help them and create a dictionary that they can use to make a dictionary that they can use to write.For the students, the choice is very important because they don't want to spend their time on inefficient, slow laptops. You can go for an extremely fast notebook, or you can go for an old laptop that has a touch screen for use with mobile devices. This is a great choice for people who are constantly learning or moving to a new school and haven't quite settled into their new school yet. An old laptop that doesn't have a touch screen will still allow you to write effectively, but it will take a lot of time to learn the new rules and routines. Laptops with touch screens have a few advantages over other laptops.Many of us have personal laptops that we use to check emails, stream video, and keep in touch with friends and family. Unfortunately, we also have personal laptops that we use to work on research papers, check on our work online, and to check on what we have to do in the classroom. Laptops are great for those who are working at home because they can get in the work you need to do, but for those who are on the go, we should have laptops that we can use for reading, writing, playing games, watching movies, and studying.The product instructions of 12 inch touch screen laptopLaptops are the modern device of choice for most students, but they are also used for almost every other task. The question is, which task will students use their laptops for the most? Some tasks require computers, and some are related to web design, so there are quite a few uses for laptops in different areas of our lives. If you have any questions about the future of laptops, then let us know in the comments section..Some laptops come with a built-in screen, others don't. Most laptops are good to have for study purposes. Some laptops come with a keyboard and some don't. These laptops may come with the greatest performance, but sometimes that doesn't mean that they are the best. If you need to learn how to type then it is better to choose a laptop that has a built-in keyboard than a laptop that doesn't.You know that the same technology used to power computers for so many years will power our smartphones, laptops and other mobile devices. The newest generation of tech has allowed us to share our phones with family and friends across the world, to use them in a way that has never been possible before. However, as our technology evolves and changes, so does our phones. You might not know what the best touchscreens are, but they can have a huge impact on your mobile experience. As technology continues to change, so do the screens on which they work.Leather bound notebooks are a great way to hold a pen, a notebook is more than just a paper, notebooks are much more than just a place to write down your thoughts and ideas. You need to be comfortable with your writing to be able to write. Whether you are working on a computer or you are trying to write a letter, you need to be comfortable with the writing process. If you are working on a computer then you will need to set up a space for your writing. A laptop can be used to hold a pen, a notebook can be used to hold a pencil and paper.How to maintain 12 inch touch screen laptopStudents often get confused about their laptop settings. A better way to keep things in order is to use the 12 Inch Touchscreen Laptop. Students can save their favorite websites to the laptop and can take notes in the same way that they would do with a notebook. The main advantage of using the 12 Inch Touchscreen Laptop is that it has an extra display. The users can scroll through the content and edit it to get the information they need. The 12 Inch Touchscreen Laptop is perfect for people who want to have a bigger screen, but they don't want to get rid of the screen.You are wasting money on new laptops. A better way to save money is to buy a used laptop that will last you a long time. It will save you from buying new laptops every time you want to buy a new laptop. Just choose the cheapest one you can find, you won't pay too much. A laptop will last you a long time and make your life easier. You will spend less money to buy new laptops. Even the cheapest laptop will last you a long time. When you are ready to buy a new laptop, you can choose a used laptop. It will cost you less money and will make your life easier.Learning about different types of laptops is really helpful to students because the most common type of laptop is the traditional desktop one. But what about the other types of laptops that we see around us in our everyday lives? There are so many types of laptops in the world, but most of them can do the same thing. This means that there are so many laptops that are good for different tasks and jobs. What laptops do best is being a personal computer that does the most important tasks for the person using it. They are the ones that most people think of when they think of computers.Tips for buying 12 inch touch screen laptopBold and beautiful but somewhat rough-edged. The class might prefer the large monitor or one that features large 3D touchscreens for taking pictures. While a Chromebook is good for keeping the classroom computer organized, it's not the best option for learning how to use your laptop to its fullest potential. Having a more portable and easy to use laptop can make a student's learning experience more enjoyable and manageable. Many teachers and students do prefer to use laptops because they feel more comfortable with their computers and don't have to take the risk of connecting a hard drive or using external storage devices.You need to learn how to choose the right laptop to get the best laptop performance. Your laptop must have at least two or three storage compartments, and a reliable web connection, for your laptop to run smoothly. Here are some laptop features that are important to know: If you want to play online games then your laptop must have an Intel Core i5 processor, 2GB of RAM, 16GB of hard disk space, a 10.Most of the laptops most powerful features can be found on the touch screen so students should look at the features they need to be aware of. The screen is able to zoom in on the graphics, type in a word or edit a sentence in real time. It also features a laptop webcam that allows students to look at the screen from anywhere in the room. Another feature that is on the screen is a slider which allows students to adjust the brightness and contrast of the screen in real time. A keyboard that can be operated from the palm of the hand allows students to work on any computer screen easily.I love to be active. When I am not working I am at home. I am able to connect with friends and family. The only problem I have is a lack of access to my personal information. In this age of technology, where we can get a laptop or tablet at home, it would be a shame to let the laptop go without the protection of the security features it has to offer. A laptop is not the only laptop you will need.
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