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Amidst the "do not understand" and "do not understand" by major domestic media and experts, China Super League has completed the signing of LED display screens for 14 stadiums except Shenzhen and Changchun. The contract is five years. Let's not discuss the right and wrong of this signing, but let's take a look at the 13 requirements that meet the LED display screens used in various stadiums.

1. The installation position and number of the display screen

1. Except for special circumstances, it is advisable to make the audience with official fixed seats more than 95% write to meet the maximum viewing distance requirement.

2. Athletes, coaches and referees at the competition site (except for the on-site scoring referees in diving competitions) can easily and clearly see the content displayed on the screen.

2. Reliability

The reliability of the stadium display screen should meet the requirements of 5.10 in SJ/T 11141-2003.

3. Security

1. The safety requirements for display screens in stadiums should meet the requirements in 5.4 of SJ/T 11141-2003.

2. The display screens in stadiums should be powered separately, and should meet the requirements in 5.8 of SJ/T 11141-2003. The construction acceptance of display cable lines in sports venues must meet the requirements of GB 50168 and GB 50171. The project quality should meet the requirements of GB 50303.

3. Devices containing polymer materials in the stadium display screen (including: LED module casing, LED module filling glue, PCB board,

Power cord sheath, etc.) must be made of flame retardant materials.

4. The display screen of the stadium should have the functions of smoke detection, lightning protection, automatic fire alarm and automatic screen shutdown, and the power distribution cabinet should have overload protection function, leakage protection function and step-by-step power-on function.

4. Maximum viewing distance and character height

1. The formula for calculating the maximum viewing distance and character height (see formula (1)> is:

H = k?d

formula:

H is the maximum viewing distance, the unit is m;

k—Sight distance coefficient, generally 345;

d— character height, the unit is m


75mm Flexible LED Mesh Display display brightnes


LED display brightnes


2. In swimming pools and diving halls with independent building structures, each character on the display screen is at least higher than . . 2 m, each character of the swimming and diving hall display screen with integrated building structure is at least 0.28 m


5. Optical propertie


1. Perspectiv


The horizontal viewing angle of the stadium display screen is not less than 1500, the vertical viewing angle is not less than 100, and the downward viewing angle is not less than 200


2. The brightness should meet the requirements in Table 1 and can be adjusted


Table 1 Brightness unit of display screen: cd/m


3. Contras


When the background illumination is less than 20 lx, the contrast ratio of the display screen should be able to reach 100 e 1


4. White point chromaticity coordinate


The chromaticity coordinates of the white field can be adjusted within the color temperature of 5 000 K-9 500 K according to the use environment. According to the CIE 1931 chromaticity system, the tolerance i


△x∣≦0.030, ∣△y∣≦0.030


5. Brightness uniformit


The unevenness of the stadium display screen should be less than 10%


6. Display Contro


1. It can display the rolling timing of the game in real time


2. Can scroll to display the game results


3. You can turn pages to display the game results


4. The displayed text content can be switched automatically and manually


5. For display screens with graphics, text and video display functions, text, pictures, animations, and live broadcast images should be able to switch between each other automatically and manually


7. Interfac


1. Network interfac


Should have IEEE 802.3 Ethernet interface


2. Data interfac


It should have the ability to assemble a variety of data interfaces including the standard RS-232 serial interface, and it must be able to communicate with the computer at the competition sit


Connect to the time scoring system and receive data


3. Video interfac


For the display screen with graphic and video display functions, it should have a video interface, which can receive video signals of various format


8. Electrical propertie


1. Frame change frequenc


The frame-changing frequency of the LED video display should not be less than 60 frames/S


2. Refresh frequenc


The refresh rate of graphic display screens used in sports venues should not be less than 60 Hz; the refresh rate of full-color video display screens should not be less than 240 Hz


3. Pixel out of control rat


The out-of-control rate of the stadium display screen should not exceed 3/10,000, and the out-of-control rate of the stadium display screen should not exceed 2/1000, and it is a discrete distribution


4. Gray scal


For the display screen used to display video images, each primary color should have 256-level (8-bit) grayscale processing capability


5. Video display resolutio


In order to ensure the video display effect of the display screen, the minimum resolution of the video screen displayed on the display screen is 320(W) X240(H


Nine, flat screen display character


1. Comprehensive gymnasiu


a. The display screens used in comprehensive gymnasiums for scoring events (gymnastics, martial arts routines, figure skating, etc.) can display at least 12 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 27 Chinese characters


b. The display screens used in comprehensive gymnasiums mainly for ball games 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 fiel


a. The display screen can display at least 13 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 26 Chinese characters


b. Each character has a flashing function


3. Swimming poo


a. The display screen can display at least 13 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 25 Chinese characters


b. Each character has a flashing functio


4. Diving Hal


The display screen can display at least 12 rows of 16-dot matrix Chinese characters, the row spacing is not less than 1/10 of the characters, and each row can display at least 13 Chinese characters


5. Other venue


You can refer to the above requirements for execution


6. The display characters of the display screens with other installation structures can be agreed upon by both parties according to the contract according to their functions and actual usage. 10. Appearance and structur


1. The appearance of the display screen in the stadium should meet the requirements of 5.3.2 in SJ/T 11141-2003


2. The protection level of the display case of the stadium should meet the requirements of 5.3.3 in SJ/T 11141-2003


3. The relative deviation of the pixel center distance of the stadium display screen should meet the requirements of 5.3.4 in SJ/T 11141-2003


4. The flatness of the display screen of the stadium should meet the requirements of 5.3.5 in SJ/T 11141-2003


Eleven, anti-corrosio


Anti-corrosion measures should be taken for display screens used in sports venues in a rotten environment


12. Electromagnetic Compatibilit


In sports venues with a variety of electronic equipment, electromagnetic compatibility is an important parameter that affects whether the equipment can work normally. The electromagnetic emission of the display screen should meet the requirements of EN55103-1, and the immunity should meet the requirements of EN 55103-2


13. Environmental adaptabilit


The environmental adaptability of the stadium display screen should meet the provisions of 5.9 in SJ/T 11141-2003.