Abstract: The 10th National Games in Nanjing Olympic Sports Center has a main arena of world-class level. The stadium is equipped with a number of LED displays, as the author of a technical audience who watch these screens, to talk about their views and hope for the 2008 Beijing Olympic Games LED display of the building would be a valuable reference

Key words: stadium LED screen

(A) large stadium LED screen types and characteristics

Last year in October in Nanjing LED held its 10th National Games. This is the 2008 Olympic Games in Beijing before the first of the largest domestic sports event. Nanjing City, Jiangsu Province has invested a large amount of manpower and material resources, construction, with first-rate Nanjing Olympic Sports Center. China's 10th National Games is a sports and major sports event of the organizational capacity of the test, but also to test the sports facilities. Olympic Sports Center in the stadium, the use of a large number of LED displays. Also been put to the test, for the 2008 Beijing Olympic venue construction and the LED display is also equipped with a selection of actual combat drills.

LED display has become a large modern sports facilities required in major sporting events in the use of a large number of LED displays, especially as the Olympic Games, such as the world's top sporting event is more essential equipment. From the point of use can be divided into two categories, one full-color video screen for the game broadcast live games (including the other court) of the wonderful scenes, or slow-motion replay of the live spectacular close-ups and so on, or use Three-dimensional animation and game performance in the way of a tournament, and so on, a word that is a large color TV. Olympic Games and major international competitions, as a large number of tourists here, many people can not come to court, or in public places in the city establish a full-color games on the big screen for the live broadcast, making more people can be as Shen Lin Like its territory participation. But it does not belong to the building of venues.

The other is time scoring display, and it's game time scoring system is connected, the player's game results and related information from the sense of the game, scoring screen time is more important, some games may No big video screen, but it can not be used for time-points of the screen. Points screen time, the key is clear and accurate real-time *, and on this basis and try to make it more vivid expression (such as animation, etc.). The main points in order to display text or text plus graphics animation shows the way the game's results, information or other information. Its color can make monochrome, multicolor or full color. Text information should be available in English and national language, graphic display is a major player in the country's national flag (the world's more than 200 countries and regions participating the banner of a wide range, there must be a full-color capability in order to display its flag in the right, if they can not give an accurate picture , It is better not to show that there is no problem, the Athens Olympic Games have used a single color, and before the Olympic Games in the scoreboard does not show the players of the national flag) is used for show animation of the event or the wonderful scenes, such as broken Records, and other goals.

There are also commercials for the big screen. On a variety of forms, the most common is around the stadium and stand on the big screen. But the Olympics does not allow commercial advertising.

(B) of the Nanjing Olympic Sports Center main stadium LED screen

Nanjing Olympic Sports Center is the main venue of the 10th National Games, is the main stadium at the opening ceremony and track and field stadium project, and so on, the audience has more than 60,000. The main stadium seats about 11,000, to be held gymnastics, short-track skating competition, and other items, there is also the closing ceremony to be held.

(1) of the main stadium. LED big screen (photo: South-screen 4, Ping of Beijing University Night 1)

Point distance: 28mm

Pixel composition: 2R2G1B

The total pixel number: 1081344

Physical resolution: 28mm

Visual resolution: 14mm

Brightness: 6500cd / m?

The use of double pixel technology

Box Size: 32X24

Ping-line number: 384X704 = 270336

Screen size: 10.752m X 19.712m = 211.94m?

Multi-color screen on the north side of the technical parameters:

Pixel pitch: 20mm

Composition of the cabinet: 64 X 48

The ranks of a number of screen: 528 X 1024 = 540672

Screen size: 10.560m X 20.48m = 216.27 m

(2) of the main stadium's big screen a total of three indoor, full-color video screen a single-screen text of the two pieces of red, full-color video screen basic parameters are as follows (photo:

Pixel: three-in-one SMDLED

Point distance: 12mm

Brightness: 1800cd / m? Correction to 6500K for 1500 cd / m?

Constitute a box: 36X36 (432X432mm)

Box Size: 448X 448 mm

To deal with the median color: 12bit / color (68,700,000,000 / color)

Gray-level to deal with: 8bit / color

Refresh rate: 400hz

The ranks of several large-screen: 972 X 540 = 524880

Large-screen box number: 27 X 15 = 405

Large screen size: 12.096m X 6.72 m = 81.28m?

(3) of the Nanjing Olympic Sports Center Stadium and the stadium full-color video screen comments

In the 10th National Games, the large screen above the normal work, manufacturers have technical personnel at the scene protect from beginning to end, there have been occasional failures, but also be able to quickly rule out the possibility to solve. I have many times to watch the game and concern about the large screen of the work and effectiveness as an interested more in-depth understanding of the big-screen look at the big-screen audience, so there are a number of ideas put forward by parties concerned for reference, in particular, 2008 Beijing's Olympic venue construction in reference to the big screen at home and results have been very good from the stadium to watch the audience, in addition to the side with very few seats as a result of the declination can not be too optimistic, all the stands (the stadium stands have four) have Good to see that the brightness, gray-level sense of stability, have a good image. When compared with other major sports venues (such as the 9th National Games Eighth National Games in Shanghai or Guangzhou Olympic Sports Center Stadium 80,000 people, as well as the Beijing Olympic stadium workers, etc.) much better.

But look carefully, you can see, this big-screen worthy of selection of scrutiny, the key is the cost comparison.

In fact the big screen at the physical distance is 28mm, through the doubling Pixel operation will be the visual resolution of 14mm, but the big screen has doubled since 1024 X 528 can reach 2048 X 1056, if there is such a high-resolution visual effects, of course, Very good, but that the current video source and not such a high resolution, even 1080p high-definition television, only 1920 X 1080, on the contrary, if the use of pixel doubling, there will be resentment of the screen, so the actual Use and not use the double-pixel, so the image resolution of 28mm or

If we do not have the idea of dynamic pixel technology, what kind of pixel screen and control structure. The following table lists the distance between points is a 22mm. Simple comparison can see the difference between the two.

A second program program

Pixel composition 1R1G1B 2R2G1B

Pitch 22.4 points, 28

Physical resolution 1991 / m? 1275 / m?

Visual resolution 1991 / m? 5098 / m?

LED unit area number 5973 / m? 6377 / m?

Control RGB R-R-G-G-B

Drive unit / pixel 3 5

Brightness 6500cd / m? 6500cd / m?

Brightness Correction (6500K) 5000cd / m? 5000cd / m?

The rest of the optical indexes are identical. Second, the program is clear that the LED tubes per unit area than the program more than 1 6%, driven more than 60% of the unit, the high cost it more than a matter of course.

Can be envisaged, if the two made 448X288 (each area of 101.12 m?, With a total area of 202.24 m?, Than it is now also the smaller) the use of dynamic pixel technology to achieve the vision 896X576 resolution. Viewing distance was reduced to half of the dead did not. The effect should be better than it is now, it might dispense with a two-color screen of the cost. In fact, many of the large-scale foreign stadium, including the Athens Olympics and European Championship field of competition there is such a case.

(4) full-color large-screen stadium situation to be better in the competition process has been very good, fly in the ointment is that the box is still seen among Pinfeng that on the screen as if there's a black mesh hood above the same . This may be related to the structure of cabinet, there may be other structural reasons.

Nanjing Olympic Sports Center Stadium is one of the few man-made ice rink there is the stadium in the South, will be transported on the short-track skating was held here. Therefore display of the working environment of temperature and humidity are also more complex, but did not display the work of the problem.

In addition to the sports stadium would also be held outside the assembly or a variety of cultural and sports activities, on the closing ceremony of the 10th National Games here. Theatrical performance for the full-color screen is also great demand for it to perform the director's intentions, the most common is to be able to light a wide range of adjustments, such as theatrical performances, often only have the lights on stage, which is sports Completely different game, and many of the big stadium screen can not meet this requirement and can cause glare of Ceguang interfere with the performance results, the director will lead to big switch off the screen. Nanjing Olympic Sports Center Gymnasium of the big-screen brightness adjustment range is also not appear to meet the requirements. Should be considered when designing the future.

(C) of the Nanjing Olympic Sports Center swimming pool LED display (photo: swimming pool)

Nanjing Olympic Sports Center swimming pool have big-screen video screen and full-color two-color graphic piece of the screen, big-screen method of using potting sealant. This screen is similar domestic products, and that is the representative of the general level of domestic manufacturers.

Video screen area of 24 square meters,

Point spacing 12mm,

Pixel composition: 1R1G1B,

1 / 4 scan

Brightness 1600cd / m?

Protection to deal with: plastic sealed Irrigation and three anti-coated paint.

As the swimming pool environment, the screen is to create the difficulties. Another feature is the swimming pool in the audience were the big-screen viewing angle to the location because it is directly in front of the pool and away from the screen very close, so require a lot of perspective, the Nanjing Olympic Sports Center swimming pool side only Auditorium, only about 2 seats 1000.

The consistency of poor display in various locations throughout the stands can see that there are many obvious differences in the brightness of a large scatter because of the angle LED lamp in the direction of the difference in brightness than in the normal line Direction is much greater, in front of the watch is often observed that the brightness of the module between the relatively poor better, if SMDLED this issue will be a lot of good, but the screen SMDLED three anti-process much harder. Although domestic manufacturers to introduce products often referred to by the sea by ship-borne radar and other electronic equipment of the three anti-technology anti-third is in effect a real strict with it's little, outdoor multi-screen display in the rain On the surface with plastic sealed Irrigation Technology, in-house circuit did not make any deal, good deal, the screen can be achieved in front of the IP56 ~ 66, of the screen for harmful gases and moisture protection can not solve, like the swimming pool will not wind and rain Direct erosion of the screen, but at a high temperature and high humidity environment, the front of the seal will not solve the problem, such as seal holistic approach PANASONIC and BARCO is the most thorough way, but the cost is too high. In fact the best way is to adopt stringent standards SMDLED real sea electronic equipment, such as the three anti-ship-borne radar processing, and its electrical performance indicators * will be very satisfactory. The cost is much lower than sealing the entire structure of the display. Now well-known foreign companies have large outdoor screen SMD products.

The big-screen gray level is obviously inadequate, and therefore a sense of the level difference, brightness and more than enough soft, especially in the dark screen when a lot of noise, the level of bad feeling. This is also the home of the most common screen, the key is to deal with the number of bits enough, homes and noise quantifying the end of noise, linear gray-level enough. At present, foreign well-known manufacturers of video processing in the median from 12 to 16 and even 19's. This allows quantification of very low noise at the same time in the brightness change its linear gray level remains unchanged, that is low in the light of the circumstances, but also to maintain gray level, of course, to achieve this kind of processing power, processor The request is much higher, much higher cost.

Here is an item of the two-color screen designed to display text information, and time-OMEGA system interface is successful in the course of the game no problem, it also shows that interface problems can be solved. The problem is a time when the scoring system is responsible for foreign firms, how to coordinate.

Diving competitions need full-color video screen, because the process of diving too fast, it is necessary to see the details of the slow-motion replay. However, the restrictions will be diving sites make large screens placed position to become a big problem. We have used mobile can be a big-screen might be a good way.

(D) of the Nanjing Olympic Sports Center the other LED display (photo: 2 tennis courts, bike 1, 1, taekwondo, an equestrian, rowing 1)

Nanjing Olympic Sports Center are more than two-color large outdoor screen in the training field and tennis courts are two-color big screen, big screen can display video, but because of the lack of blue color, the effect was not so satisfactory, the National Games The main training ground during the race showed that athletes found the information recorded, tennis courts data show that race. During the National Games, the Olympic Center of the East Gate Plaza, also leased two sets of two-color outdoor big screen, with an area of about 30 square meters. These screens are working fine.

There are many venues of the small screen, mainly to the athletes and referees to provide relevant information. Stands on the audience not entirely visible display. For example, gymnastics individual apparatus competitions next to the site, there are three sides of the text display screen, track and field have movable screens on both sides, which have a two-color and monochrome screen, the normal work. Close down very easily, look in sports competitions are also a lot of this type of display. As the game a lot of projects that need to show that the information is also a great difference, so this type of display software and interface will be a major difficulty.

(Photo: full-color ad)

There are strip around the stadium full of color, use it to do field media advertising, display advertising is a full-color posters and LOGO manufacturers in the domestic sports arena may be used for the first time such a large number of LED billboards. From the results, it should be good, the bar screen because of the length of the last hundred meters, it Perspective chromatic aberration caused by the poor is inevitable as long as the ads to ensure a distance of no obvious difference can be, National Games from the strip-screen advertising work, and there can be * problem, I have observed many times on the point of failure exists, there is a larger region does not shine. Overall, however, is encouraging, the Olympics does not allow ads, of course, will not use this type of screen, but other sports should be considerable business opportunities.

Games of the 10th National Games on advertising around the screen appears to be the use of the outdoor full-color design and components. However, in practice around the stadium LED screen advertising in need of special design, there are two main issues, first is to be able to tolerate the possible impact, such as football kicked on the screen is often occur in the second Is to prevent injuries, this type of screen in place around the sports venues, athletes and even the audience may direct hit, game players into the billboard on the matter are very common, serious injury can not, do this, to mask the use of soft Materials, the edge of box can not be sharp prominence, and it can not get an electric shock accident occurred, and so on. In addition to facilitate the deployment and also closed down.

(E) used to perform the closing ceremony of the 10th National Games of the LED screen (photo: 6)

It is worth mentioning that used to perform the closing ceremony of the 10th National Games on the stage of the ground under the full-color LED display, the closing ceremony of the rental of three full-color display, two sets of vertical installation, performance venue (stage), a Sets to reach the area nearly 400 square meters, from 160 units, each unit 128 out x48 line, covering an area of 2.45m?. Point spacing 20mm, composed of pixels for 2R1G1B, the use of LED performance capability, making the closing ceremony of the show, "rivers, lakes, sea," the creativity has been a very good reflection of the stage is usually light from the top and side of the fight, will be projected on the ground A shadow, now with large LED screen on the ground show that direct a variety of backgrounds, there is no shelter, you can have a light can not be achieved. In particular the stadium audience in the stands, looking down from, so excellent results. The LED display, as must actor in the top of the screen shows the impact of vibration and so on than to put up the big screen is much more powerful. The screen of anti-seismic structure of the high performance requirements, the good news is that throughout the course of performing the closing ceremony of the failure.

Inadequacies of the color display module is very serious, It is understood that the use of two manufacturers of display units, and two units used by the control LED of a different perspective. Italy and the erection of the original installation of two large-screen images on the ground with a big screen there are images of convergence, which of course is to use software to achieve, but not be able to achieve, or will be more exciting.

And around the stadium screen ads similar to the stage as a full-color screen on the ground is also in need of special design, directly to the large outdoor screen in such circumstances, it is inevitable that some problems. The most important is the question of perspective and color effects. For example, most of the large outdoor screen using elliptical, of the horizontal and vertical perspective is different, and in the stadium in all directions, both viewers will watch the direction of some poor results. Visor will affect the color effect. The experience and still too little information. Yun-tenth the closing ceremony is a very successful experiment.

(F) perception

1, however, is a writer audience watched the screen after some of these perceptions, there is no evaluation. The general feeling is the tenth successful delivery, first-class venues, the victory of the screen to complete the task. Video screen, two-color screen, graphic screen, screen-specific events, advertising screen range, coupled with the closing ceremony of the Wu Mei-ping, is rich and varied. Is not by the previous National Games, Beijing should also preview the 2008 Olympic Games. Deficiencies in the front have discussed that we have done is just from a technical point of view about the issue. The key is in the planning and design of the careful selection of time to do a comprehensive feasibility studies, in particular the video display screen as a large fixed facilities, high-impact investments, under normal circumstances would not do the second, often appear to do a good job after Found some problems, or is not the best of circumstances, the film director often said that the film is "The Art of regret", the screen had a similar situation. So as far as possible an in-depth work, planning a little more careful, more detailed options that should be good.

2, adopted by the Nanjing Olympic body in which the screen, you can see domestic manufacturers display the status and related information can also be well-known international brands compared to some of our thinking.

LED industry in China started in the late 1980's in the early 1990s, now nearly 20-year history, compared with foreign countries, it can be said when it started much earlier, the industry is a very long-term vision in blue LED Prior to the commercialization of color have not yet developed a full-color screen, adapted to China's rapid economic development, LED in various fields of application are also a long time ago. The mid-1990s, there have been a low ebb, but soon and rational, so a healthy growth rapidly. After more than a decade of development, China's LED industry has become a large scale, there have been many well-known manufacturers, product quality and technical level has been greatly improved and the process can also * have made considerable progress. Now China-made screen in many ways comparable to foreign products can be. There are also a considerable number of export, (but rarely is their own brand of exports) but with the well-known foreign manufacturers began to enter the field of LED, we have high-end product that is high-quality images can be high in areas such as sexual * products and Foreign-the-art level of the increase in the gap in fact, the electronics industry and other similar products, technically, is still subject to basic industries and basic research, particularly in large-scale integrated circuits, micro-electronics technology and digital technology Signal processing technology, and other constraints, from the development of the industry, mainly lack of input from the competition in the market for disorderly competition because it is caused by the impetuous state of mind. The situation is that in general the business of outdoor advertising such as display screens, lights, graphic screen equivalent to foreign exchange rate is not very different from the product, show that in Chinese characters still advantages for outdoor advertising LED video displays, Uneven levels, but on the whole can be stabilized, although the picture quality than foreign products compared to a certain gap, but also some well-known abroad than the manufacturers of products is almost the same. In the process, there are obvious gaps in the current domestic price of foreign products in general is only about 50%, are even lower, if the structure of the process in some aspects of martial arts, is likely to be completely well-known foreign manufacturers of similar The level of product

3, generally in the following three areas we are still gaps

1) photoelectric index to further improve the

All-digital processing, video processing of the median longer to deal with a smaller loss, if it goes up to 19, is here to address filtering, such as the realization of zoom, motion detection and compensation, noise reduction, etc.

A higher level of gray, such as a median of 14, (4.3 T color) that the ADC, at least in the median of 14.

A higher refresh rate, generally up to 1000hz

Point-by-amendment

Color correction

Intelligent Module

Consistency of capacity, the means test and control

On-line and on-site to amend and adjust the capacity, especially for indicators of decay and degradation of the performance of on-site calibration capability

2) The ability to innovate

Systematic Design

Design professionals and professional production, design and product-specific

The combination of hardware and software design, such as surface and shape of any shape, form a special "screen"

Brands, patents, intellectual property rights

3) the embodiment of large-scale production

The formation of the product line is a mature product logo

The exclusive use of large-scale integrated circuit chip design ideas and algorithms in the chip curing

Can achieve on the level of supermarket shelves, agents or users can install on their own debugging

4) * can be high,

On-site to reduce the workload to a minimum, can be put into operation prior to the erection minimum time for debugging

MTBF, MTTR, repair time was reduced to a minimum

4, the construction of the Beijing Olympic Games display of the proposed

For the Olympic effort is our duty and honor. Why is concerned about the Nanjing Olympic display, is because it is before the Beijing 2008 an overall review. Through observation and comparison, collect a lot of information, compared with the calculation also a fact that some ideas, and some also talked about the BOCOG and Beijing. In general, the following

1) The venue for the big screen the whole configuration should be careful argument, a stadium what kind of big-screen, permanent or temporary, fixed or mobile, according to overall planning decisions. Not only makes the need to ensure competition, but also take into account the end of the race after use.

2) for the stadium's big screen specific targets have the right to choose, the most important functional requirements, to watch the distance, environmental protection and requirements

On the show, the international official to meet the requirements of the game, but also international practice and habit of watching. The most appropriate use is the best. For example, choose how much of the area, not necessarily the world's largest, of course, have the largest impact, but may not have good results. In short, to do the best screen, but not necessarily the biggest screen.

In the selected screen type, size, structure and so on after the basic framework of specific indicators to demonstrate the product, which will involve more professional technical problems, manufacturers are usually a lot of the product line, to a certain extent the scope of application, it is necessary to compare And options to get the best cost performance.

3) Beijing Olympic Games display the time and scoring system are the Panasonic and sponsored by OMEGA, making many of the special nature of specific operations, especially for foreign products grasp of the technical indicators, such as testing and acceptance of the need for more effort under the .

Reference link: http://www.17led.com/LEDdisplay/2008-04/62.html

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