In recent years, including the Beijing Olympic Games, the Guangzhou Asian Games, the Shanghai World Expo, the Shenzhen Universiade, and the 2012 European Cup, London Olympics and other venues for sports events, LED displays have sprung up in the face of the world, and technology has matured. The venues are often full of popularity. The audience far away from the competition venue may not be able to see the sports star's wind race. However, with the LED display technology support, people can watch the events at close range by switching the camera lens to the live display of the LED display. Meet people's needs and wishes. However, do you know how the LED display of the stadium is different from the display of other venues? What are the requirements and standards for LED stadium screens? Here, Xiaobian will answer you carefully:
Multi-functional stadiums have high standards and high quality requirements for LED displays
In order to ensure convenient and accurate use of the display screen, the multi-purpose gymnasium should adhere to the requirements of high standards, high technology and high quality in design and manufacture, which can be analyzed from the following aspects.
1.1 High standard materials
Luminescent material. Luminous materials are the most important materials for displays, especially full-color displays. They are the key to ensuring display performance, high reliability and long life. The main reference indicators are brightness and uniformity.
Control the driver chip. The control driver chip is the guarantee of the key design of the display. Due to the high technical content of this part and the uneven level of the manufacturer, the design of this part should be treated with caution.
Switching power supply. The switching power supply is a component with a high failure rate in the display, and a high-quality switching power supply must be used to ensure that the display requirements of the stadium display are met.
1.2 High level of control technology
The stadium display is a large-scale facility for competitive projects. It needs to integrate advanced technologies in the industry, such as static latch technology, white balance technology, nonlinear correction technology, high gray level technology, and color uniformity technology. Video processing technology, fast motion image compensation technology, full brake control technology, etc.
1.3 Quality assurance of design and installation and commissioning
The stadium display screen is generally used for sports competitions and large-scale events. Any faults and mistakes will have a great impact, so stable engineering quality is an objective requirement of users. In order to meet the requirements and ensure the stable and reliable operation of the display, it is necessary to ensure quality in the design, production, installation, commissioning and delivery, and use an effective quality assurance system to ensure the entire production process.
2. Analysis of the demand for the led display on the site
The design, manufacture, installation, commissioning and operation of the LED electronic display must be matched with the plane and profile of the stadium, and the overall effect should be coordinated. At the same time, the power supply structure of the site should be fully considered. In general, the power supply should be guaranteed to operate normally in the range of (220 ± 22) V, (380 ± 38) V. In addition, all control equipment should be concentrated in one control room, and the access points of the control equipment should be left in the referees of various competitions.
The venue is large, the audience seats more than 5,000 stadiums, generally can build two 40M2 LED electronic display, one screen is divided into clock area, full color area and dual primary color area three parts, another screen can be divided It is a two-part clock area and a dual primary color zone. This not only ensures the satisfaction of various functions, but also ensures the rational use of funds. If the funds are sufficient, and it is possible to undertake large-scale gatherings or competitions in the future, you can also make the two screens into full-color screens, so that the playback effect will be more realistic and the atmosphere will be more intense.
3. Analysis of the demand for the display content of the LED display
The versatile modern gymnasium can be used not only for holding various sports competitions, but also for holding various large-scale literary events and gatherings. Therefore, the display content requirements of the display screen can be summarized as rich, diverse and real-time, as follows:
3.1 The need to broadcast video images live
The sports competitions, cultural performances and large-scale events held by the stadium can be broadcast live through the electronic display, and have special effects such as panorama, close-up, slow motion, flashing action, towed images, nostalgic movies.
3.2 Compatibility requirements for multiple input methods
The stadium display can not only be real-time live broadcast of real color by camera, but also broadcast TV and satellite TV programs, play VCD, DVD, LD and various homemade video signal programs, support PAL, NTSC and other standards, the display content can also be Various graphic information on the computer, from the internal information network of the stadium or the public information network; it has the function of superimposing text information on the TV screen, and can also superimpose text, picture, animation and other functions outside the video image; Play related background images during large gatherings.
3.3 The need for rich and colorful graphic information playback
On the one hand, the stadium display can be used for live broadcast of video images. On the other hand, it can publish news, important notices, and slogans. The display can display text, graphics, patterns, animations, etc. The function of the text.
3.4 requirements for multiple broadcast methods
To have pan, scroll, rotate, wipe, pull, single/multi-line pan, single/multi-line up/down, left/right pull, up/down, page flip, move, rotate, zoom out, zoom in, blink In order to hold large-scale international sports events and events, the display screen is compatible with the languages ​​of various countries. For example, it can display Chinese, English, numbers and various characters, and there are many font fonts to choose from. Level zoom.
3.5 The need for in-stream advertising and display methods
As the most attractive display media in the gymnasium, the full-color display screen of the stadium will inevitably become the first choice for the publicity of the majority of enterprises. Therefore, the needs of displaying the content must also fully consider the needs of the advertisements of various businesses, so that the display screen can be quickly and conveniently Interspersed with corporate advertising to meet the needs of our customers.
3.6 Needs for sports information and sports results announcement
The release of sports competition information and achievements is a basic requirement for the electronic display to realize its display function. Therefore, the design requirements should be fully considered in the use of various sports competitions, and game information such as basketball, volleyball, badminton, table tennis, Weightlifting, gymnastics and other game information, in the results announcement can display country name, team name, name, athlete number and score record; the game can display a variety of real-time information, such as the team name, score, goal athletes, change The name, number and number of athletes who are penalized by the person.
3.7 clock display requirements
3 Another display function of the stadium display is to require accurate clock display function. The clock display function includes Beijing time, match clock, countdown display, different game clocks can be set according to different game items and referee rules, and timing can be conveniently controlled. Pause, reset, fast adjustment, slow adjustment, etc.
3.8 audio synchronization playback needs
The stadium display has an audio interface that can be combined with the sound in the stadium to achieve sound image synchronization.
4, LED display environment needs analysis
high brightness. Since stadium competitions and events take place during the day or under intense lighting, the display must be high-brightness and clearly visible under strong light.
Moisture, corrosion and heat dissipation. Due to the large size of the display screen, fixed installation, and more wiring, it is not possible to make special storage methods. In addition, it should adapt to the humid, rainy and hot weather that may occur in the installation area. Therefore, to ensure stable and reliable use, it must be designed and constructed. Consider moisture, corrosion and good heat dissipation measures. At the same time, the display should be dust-proof.
5, LED display referee system needs analysis
The normal service function of the display must be completed by the referee and the complete software support. The referee consists of a timer and a scorer. The Software should be a complete package that must be fully supported for different sports competitions and refereeing rules.
6, the demand analysis of LED display system
The stadium display is an important part of the stadium's electronic information system, so the display and control system is a systematic project. The computer, the stadium, the referee station, the referee, and the news center of the gym are integrated into one, which serves the entire sports competition efficiently. It is a systematic design, and this part is for the entire large-scale sports activity network. It is only one of the components, so compatibility should be fully considered in the overall system design. All interfaces use standard interfaces to form a systematic facility for sharing information resources with the network.
13 requirements for stadium LED display
Based on practical experience, professionals have summarized 13 requirements for LED displays for sports venues:
First, the installation position and number of the display
1. Except for special circumstances, more than 95% of the audience who have officially fixed seats in the venue should meet the maximum line of sight requirements.
2. The athletes, coaches and referees at the competition site (except for the referee on the spot in the diving competition) can easily and clearly see the contents displayed on the screen.
Second, reliability
The reliability of the stadium display shall comply with the requirements of 5.10 of SJ/T11141-2003.
Third, security
1. The safety requirements for the display of the stadium should meet the requirements of 5.4 of SJ/T11141-2003.
2. The display screen in the stadium should be powered separately and should meet the requirements of 5.8 of SJ/T11141-2003. The construction acceptance of the display cable line of the stadium shall meet the requirements of GB50168 and GB50171. The quality of the project should meet the requirements of GB50303.
3. Devices containing polymer materials in the stadium display (including: LED module housing, LED module filling glue, PCB board,
The power cord sheath, etc.) needs to be a flame retardant material.
4. The display of the stadium should have smoke, lightning protection, automatic fire alarm and automatic screen off function. The power distribution cabinet should have overload protection function, leakage protection function and step-by-step power-on function.
Fourth, the maximum line of sight and character height
1, the maximum line of sight and character height calculation formula (see formula (1) is:
H=k? d
formula:
H maximum line of sight, the unit is m;
K - line of sight coefficient, generally taken 345;
D—the height of the character, in me
LED display brightness
2, the independent structure of the swimming pool and diving hall display each character is at least higher than 0.2m, the building structure of the swimming diving hall display each character is at least higher than 0.28m.
Fifth, optical performance
1. Perspective
The horizontal viewing angle of the stadium display screen is not less than 1500, the vertical upper viewing angle is not less than 100, and the lower viewing angle is not less than 200.
2. The brightness should meet the requirements of Table 1 and can be adjusted.
Table 1 brightness unit of display: cd/m'
3, contrast
When the background illumination is less than 20lx, the contrast of the display should be 100e1.
4, white field chromaticity coordinates
The white field chromaticity coordinates are adjustable within the color temperature of 5000K-9500K according to the use environment. According to the CIE1931 chromaticity system, the tolerance is
△x∣≦0.030,∣Δy∣≦0.030.
5, brightness uniformity
The unevenness of the display of the stadium should be less than 10%.
Sixth, display control
1, can display the rolling timing of the game in real time.
2, you can scroll through the results of the game.
3, you can turn the page to display the results of the game.
4. The displayed text content can be switched automatically and manually.
5. For the display with graphic and video display functions, text and pictures, animations, and live broadcast images should be automatically and manually switched between each other.
Seven, the interface
1, network interface
Should have an IEEE802.3 Ethernet interface.
2, the data interface
Should have the ability to assemble a variety of data interfaces, including the standard RS-232 serial interface, to be able to compete with the game site
The time scoring system is connected to receive data.
3, video interface
For displays with graphic and video display functions, there should be a video interface to receive video signals of various formats.
Eight, electrical performance
1, frame change frequency
The frame change frequency of the LED video display should be no less than 60 frames/S.
2, refresh frequency
The refresh rate of the graphic display screen of the stadium should be no less than 60Hz; the refresh rate of the full-color video display should be no less than 240Hz.
3, pixel out of control rate
The out-of-control rate of the stadium display should be no more than three-tenths of a percent. The out-of-control rate of the stadium display should be no more than two thousandths, and it is discretely distributed.
4, gray level
For display screens for displaying video images, each primary color should have 256-level (8-bit) grayscale processing capability.
5, video display resolution
In order to ensure the video display effect of the display, the minimum resolution of the video display on the display screen is 320 (W) X240 (H)
Nine, the flat display shows characters
1. Comprehensive gymnasium
a. The comprehensive stadium for the scoring project (gymnastics, martial arts routines, figure skating, etc.) can display at least 12 lines of 16-character Chinese characters with a line spacing of at least 1/10 of the characters, and at least 27 Chinese characters per line. .
b. The display screen of the comprehensive gymnasium based on the ball game competition can display at least 8 lines of 16 dot matrix Chinese characters, the line spacing is not less than 1/10 of the characters, and each line can display at least 16 Chinese characters.
2, track and field
a. The display screen can display at least 13 lines of 16 dot matrix characters, the line spacing is not less than 1/10 of the characters, and each line can display at least 26 Chinese characters.
b. Each character has a blinking function.
3. Swimming pool
a. The display screen can display at least 13 lines of 16 dot matrix characters, the line spacing is not less than 1/10 of the characters, and each line can display at least 25 Chinese characters.
b, each character has a flashing function
4, diving hall
The display can display at least 12 lines of 16 dot matrix characters, the line spacing is not less than 1/10 of the characters, and each line can display at least 13 Chinese characters.
5. Other venues
Can be implemented with reference to the above requirements.
6. The display characters of the display screens of other installation structures can be agreed by the supplier and the buyer according to the contract according to their function and actual use.
X. Appearance and structure
1. The appearance of the stadium display should meet the requirements of 5.3.2 of SJ/T11141-2003.
2. The protection level of the display enclosure of the stadium shall comply with the requirements of 5.3.3 of SJ/T11141-2003.
3. The relative deviation of the pixel center distance of the stadium display screen shall comply with the requirements of 5.3.4 of SJ/T11141-2003.
4. The flatness of the display of the stadium should meet the requirements of 5.3.5 of SJ/T11141-2003.
XI, anti-corrosion
Anti-corrosion measures shall be taken for the display of sports venues in a corrosive environment.
Twelve, electromagnetic compatibility
In stadiums with a variety of electronic devices, electromagnetic compatibility is an important parameter that affects the ability of the equipment to work properly. The electromagnetic emission of the display screen shall meet the requirements of EN55103-1, and the immunity shall meet the requirements of EN55103-2.
XIII. Environmental adaptability
The environmental adaptability of the stadium display screen should meet the requirements of 5.9 of SJ/T11141-2003.
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