This standard specifies the definition, classification, technical requirements, inspection methods, inspection rules and packaging, transportation and storage requirements of LED display screens. This standard is applicable to LED display products such as LED display screen, LED full-color screen, LED outdoor billboard, square screen and stage screen. It is the main technical basis for the design, manufacture, installation, use, quality inspection and formulation of various technical standards and technical documents of LED display large screen products.
2 cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, all versions shown were valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest version of the following standards.
GB 19 1-90 graphic signs for packaging, storage and transportation.
GB2423. 1-89 basic environmental test procedures for electrical and electronic products test a: low temperature test method.
GB2423.2-89 Basic environmental test procedures for electrical and electronic products Test B: High temperature test method
GB2423.3-89 Basic environmental test procedures for electrical and electronic products Ca constant moist heat test method
GB4943-95 Safety of information technology equipment (including electronic equipment)
GB6388-86 Transport and Receiving Marks of Transport Packaging
Vibration test of electronic measuring instruments
GB6587.6-86 Transport Test of Electronic Measuring Instruments
Rules for quality inspection of electronic measuring instruments
GB98 13-88 general specification for micro digital electronic computers
GB 1 1463-89 reliability test of electronic measuring instruments.
SJ/T 10463-93 Requirements for Packaging, Marking and Storage of Electronic Measuring Instruments
3 definition
This standard adopts the following abbreviations and definitions:
3. 1 LED light emitting diode LED
3.2 LED display screen LED panel is used to display various information such as text, text, graphics, images, animations, quotes, TV and video signals through certain control methods. It is a display screen composed of LED device arrays. According to different combinations of pixels, it can be displayed as single and double color text and full color picture.
3.3 Display unit The display unit is the smallest unit that constitutes the LED display screen, which is determined by the circuit and installation structure and has the display function. Usually, for example, outdoor P 16 is 256mm*256mm or 256mm* 128mm, P0d is 320mm*320mm and so on. LED display screen and large screen manufacturer's quotation 137243875 15
3.4 Critical defects of fatal nonconformity may cause harm to users and maintenance personnel or unsafe nonconformity, or the important characteristics of unit products do not meet the requirements, or the quality characteristics of unit products seriously do not meet the requirements.
3.5 Out-of-control point The light-emitting state of the out-of-control point is inconsistent with the display state required by the control, and it is a discrete LED basic light-emitting point, which is commonly called uncontrolled pixel.
3.6 Pseudo-color LED display Pseudo-color LED panel Install monochrome LED devices with different colors in different areas of the LED display screen to form an LED display screen.
3.7 Full-color LED display The full-color LED panel is composed of three primary color LED devices, namely red, green and blue, which can be used to bring up multi-color LED display screens.
4 classification
The LED display screen can be classified according to the following conditions:
4. 1 use environment LED display screen can be divided into indoor LED display screen, outdoor LED display screen and semi-outdoor LED display screen according to the use environment.
4.2 Display color LED display screen is divided into monochrome LED display screen (including pseudo-color LED display screen), two-color LED display screen and full-color (three-color) LED display screen according to the display color. According to the gray scale, it can be divided into 16, 32, 64, 128 and 256 gray LED display screens. LED display screen and large screen manufacturer's quotation 137243875 15
4.3 Display performance LED display screens are divided into text LED display screens, graphic LED display screens, computer video LED display screens, TV video LED display screens and market LED display screens according to display performance. Quote LED displays usually include LED displays for securities, interest rates, futures, stations and other purposes.
4.4 Basic Light Emitting Point Among the off-market LED display screens, indoor LED display screens can be divided into 3mm, φ37φ5mm, φ 5mm, 8mm, φ 10mm according to the diameter of LED single point. Outdoor LED display screen can be divided into φ 19mm, 22mm and mm26 according to pixel diameter.
According to the size of LED display screen used in the market category, it is divided into 2.0cm(0.8 inch), 2.5cm( 1.0 inch), 3.0cm( 1.2 inch), 4.6cm (1.8 inch) and 5.8cm(2.3 inch).
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5. 1 LED display hardware environment
The hardware part of LED display screen includes general computer part, communication line, special data conversion part and display part, which is determined according to the type, area and use place of LED display screen. In the detailed specification, it should be stated that:
A. Requirements for computer mainframe, various optional cards, external devices and communication interfaces;
B. Requirements for communication lines and indicate the maximum communication distance; In general, the transmission distance of network cable is less than 98 meters, and if it exceeds 98 meters, it must be transmitted by optical fiber.
C. Communication mode between the data conversion part and the computer host; Connected by the control system.
D power supply requirements and structural installation requirements are allocated according to the maximum probability.
5.2 Software environment for LED display screen The manufacturer's quotation for LED display screen is 137243875 15.
LED display screens with different performances should be equipped with display software that can meet their display function requirements. The software has the following functions:
A meet the requirements of serialization and standardization, and be backward compatible;
B adopt the operating system and language specified in the detailed specification;
C. Equipped with perfect self-inspection procedures and various levels of diagnostic procedures as required;
D. equip the special LED display screen with corresponding special software.
5.3 Structure and Appearance
5.3. 1 LED display screen can be made of steel, aluminum, wood and other materials. Strong and beautiful structure is required. Of course, there are also special structural ways, such as hoisting structure.
5.3.2 Appearance LED shows that there is no obvious scratch on the outer frame of the large screen. Outdoor LED display pixel tube installation should be consistent, and the shell is not loose or damaged.
5.4 Safety requirements
Large LED display screen belongs to Class I safety equipment specified in GB4943.
5.4. 1 LED display screen protection grounding terminal.
Safety marking
5.4.2. 1 LED display protection grounding terminal should be marked.
5.4.2.2 LED display screen should have warning signs at the fuse and switching power supply.
5.4.3 The floor drain current on the LED display screen shall not exceed 3.5mA (AC effective value).
5.4.4 The LED of electrical intensity shows that the large screen can be 50HZ, 1500V (AC effective value) and the test voltage 1min, and there should be no insulation breakdown.
5.4.5 Temperature rise LED shows that the temperature rise of metal parts and insulating materials should not exceed 45K and 70K after thermal balance is reached when a large screen is used.
5.5 Large screen performance characteristics of LED display screen
Text LED display and graphic LED display shall have the move-in and move-out modes and display modes specified in the detailed specification.
Computer video LED display should have:
Animation function. It is required that the large-screen animation display of LED display screen is consistent with the display of the corresponding area of computer display screen; Text display function. Require stable text display and clear crosstalk; Gray scale function. It is required to have the gray level specified in the detailed specification. The TV video LED display screen not only has the functions of animation, text display and gray scale display, but also can display TV and video pictures. The quotation LED display screen has the corresponding market display ability. The quotation of LED display manufacturers is 1 37 24 38 75 15.
5.6 Uniformity The uniformity requirements of the large LED display screen shall be specified in the detailed specification.
5.7 Out-of-control point The out-of-control point of indoor LED display should not be greater than three thousandths, and the out-of-control point of outdoor LED display should not be less than three thousandths; And the distribution is discrete.
5.8 Power Supply The power supply of the LED display screen is 220 W 10%, 50 Hz 5% or 80 V 10%, and 50 Hxz 5%. The detailed specification shall specify the maximum power consumption per unit display area or the total power consumption of LED display screen.
5.9 Environmental adaptability
5.9.2. 1 temperature The ambient temperature of the indoor screen is: low working temperature: 0C; High temperature: +40C. Low temperature of storage environment:-40 C; High temperature: +60C.
The ambient temperature of outdoor screen is: low working temperature: optional -20C,-10c; High temperature: +50C. Low temperature of storage environment:-40 C; High temperature: +60C.
Under the highest working temperature of high temperature and high humidity in 5.9.2.2, the LED display screen should be able to work normally at 90% relative humidity.
5.9.3 Vibration LED shows that the large screen bears the vibration during transportation, loading and unloading and moving of automobiles, trains and airplanes. The on-board screen should be able to work normally when the installed vehicle is running. In order to have high seismic performance, our company has recently produced several large-scale car LED display screens for customers, which have been widely praised by customers for their high-standard seismic performance.
5.9.4 The transportation LED display screen can be transported by ordinary vehicles such as cars, trains and airplanes.
5. The reliability of10 requires that the MTBF(ml) of the large-screen LED display unit should be no less than10000h.
6 inspection method
6. Hardware environment of1LED display screen Through visual inspection, the hardware environment of LED display screen shall meet the requirements of 5. 1.
6.2 Software use environment of LED display large screen The software use environment of LED display large screen shall meet the requirements of 5.2 through visual inspection.
6.3 Structure and Appearance The structure and appearance of the LED display screen shall be visually inspected, which shall meet the requirements of 5.3.
6.4 Safety requirements
6.4. 1 Grounding Visual inspection of LED display screen shall meet the requirements of 5.4. 1.
6.4.2 Safety signs Visual inspection of the safety signs of the LED display screen shall meet the requirements of 5.4.2.
6.4.3 For the floor drain current, when the rated power supply voltage is 1. 1 times, the floor drain current between the power line of the LED display screen and the metal outer frame shall meet the following requirements.
The requirements of Article 5.4.3.
6.4.4 The LED of electrical intensity shows that the large-screen power switch is in the ON position, and 1500V (AC effective value) 1min is applied between the power input terminal and the metal frame or accessible metal structure, which shall meet the requirements of 5.4.4. Quotation of large screen manufacturers 1 37 24 38 75 15
6.4.5 Large LED display screen for heating. After working for one hour, test the temperature of each touchable point with a point thermometer, which shall meet the requirements of 5.4.5.
6.5 Performance characteristics According to the different types of LED display screens, the performance characteristics of LED display screens should be checked and meet the requirements of 5.5. Visually check the moving-in and moving-out modes and display modes of the text and graphic LED display screens with display test software. Visual inspection of computer video LED display screen, check animation function by displaying computer animation, check text display function by LED display screen and computer monitor, and check gray function by special test software. Quote of big screen manufacturers 1 37 24 38 75 15. The TV video LED display screen not only has the above animation, text and grayscale functions, but also has the function of watching TV and recording with video source. For LED display screens in various markets, corresponding test software should be used to check their market display functions.
6.6 Uniformity The uniformity of LED display screen shall be checked by visual inspection, which shall meet the requirements of 5.6.
6.7 Out-of-control point Visual inspection of the out-of-control point of the LED display screen shall meet the requirements of 5.7.
6.8 Power Supply Measure the power of LED display power supply with a wattmeter, which shall meet the requirements of 5.8.
6.9 Environmental adaptability
6.9. 1 High-temperature load test The high-temperature load test shall be conducted on the display unit according to GB2423.2. The indoor screen shall be powered on at (40 2) 0C, and the outdoor screen shall be powered on at (50 2) 0C for 8h, and shall be checked once every hour. Check the moving-in and moving-out mode, display mode, uniformity and out-of-control points of the text LED display screen and the graphic LED display screen; Check the animation function, text display function, gray function, uniformity and out-of-control points of computer video and TV video LED display screens; Check the market display function of the market LED display screen. The requirements of 5.5, 6.6 and 5.7 shall be met.
6.9.2 The display unit of high-temperature storage test shall be subjected to high-temperature storage test according to GB2423.2, stored at (60 2) 0C for 4 hours, and restored at room temperature for 4 hours, and then the moving-in and moving-out mode, display mode, uniformity and out-of-control point of the text LED display screen and the graphic LED display screen shall be checked. Check the animation function, text display function, gray scale function, uniformity and out-of-control points on the big screen of computer video and TV video LED display screen. The quotation of large screen manufacturers is 1 37 24 38 75 15, and the market display function of large LED display screen should be checked to meet the requirements of 5.5, 5.6 and 5.7.
6.9.3 The display unit of damp-heat load test shall be subjected to damp-heat load test according to GB2423.3. The indoor screen shall be powered on for 8 hours at (40 2) 0C and 87%-93% relative humidity, and the outdoor screen shall be powered on for 8 hours at (50 2) 0C and 87%-93% relative humidity, and shall be inspected once an hour. Check the move-in and move-out mode, display mode, uniformity and out-of-control points of text LED display and graphic LED display. Check the market function of large LED display. The requirements of 5.5, 5.6 and 5.7 shall be met.
6.9.4 Constant temperature and humidity test According to GB2423.3, the display unit was tested at constant temperature and humidity. The indoor screen was stored at (40 2) 0C and the relative humidity was 87%-93% for 48 hours, while the outdoor screen was stored at (50 2) 0C and the relative humidity was 87%-93%. After the water storage test, the floor drain current, electrical strength and temperature rise shall be measured immediately, which shall meet the requirements of 5.4.3, 5.4.4 and 5.4.5. The quotation of big screen manufacturers is 1 37 24 38 75 15. After 4 hours of recovery at room temperature, check the moving-in and moving-out mode, display mode, uniformity and out-of-control points of the text LED display and the graphic LED display. Check the moving-in and moving-out mode, display mode, uniformity and out-of-control points of computer video and TV video LED display screens. Check the animation function, text display function, gray scale function, uniformity and out-of-control points on the big screen of computer video and TV video LED display, and check the market display function on the big screen of market LED display, which should meet the requirements of 5.5, 5.6 and 5.7.
6.9.7 The vibration test display unit shall be subjected to vibration test BG6587.4. Under the condition that the vibration frequency is 5H-55H-5H and the amplitude is 0. 19MM, 5IMN scans once, twice in both directions. After testing, check the moving-in and moving-out modes, display modes, uniformity and out-of-control points of text LED display screen, graphic LED display screen and graphic LED display screen; Check the animation function, text display function, gray performance, uniformity and out-of-control points of computer video and TV video LED display screens; Check the market display function of market LED display screen and graphic LED display screen, which shall meet the requirements of 5.5, 5.6 and 5.7.
6.9.8 The transportation trial run test shall be carried out on the display unit according to the sliding horizontal circulation condition specified in GB6587.6. After the test, the access mode, display mode, uniformity and out-of-control points shall be checked on the text LED display and graphic LED display, and the animation function, text display function, gray function, uniformity and out-of-control points shall be checked on the computer video and TV video LED display. Quote of large-screen manufacturer 1 37 24 38 75 15 To check the market display function of large-screen LED display screen, it should meet the requirements of 5.5, 5.6 and 7. The large LED display screen for vehicle-mounted mobile operation should be tested for on-site transportation.
6. 10 reliability test The reliability test of the display unit was conducted according to GB 1 1463. A=20%，B=20%，DM=3.0。 According to the contract, reliability verification tests are also allowed.
7 inspection rules
7. 1 inspection items
7.2 Appraisal inspection
7.2. 1 Appraisal inspection is divided into design appraisal inspection and production appraisal inspection.
7.2.2 Appraisal inspection shall be conducted by the department designated by the superior or the quality inspection unit entrusted by it.
7.2.3 Sampling method and inspection items
7.2.3. 1 Requirements for hardware environment, software environment, structure and appearance, safety requirements, performance characteristics, uniformity, out-of-control and power supply of LED display screen.
Power supply inspection shall meet the requirements of 5. 1-5.8.
7.2.3.2 randomly selects a set of display units from the large-scale LED display screen that passed the inspection in 7.2.3. 1 and conducts environmental adaptability inspection on schedule.
7.2.3.3 is on the identification LED display screen as scheduled. 10. adopt the test scheme of timing truncation specified in GB 1 1463.
In 7.2.3.4, a large LED display screen designed and evaluated was tested on the spot.
7.2.4 In the previous 2.3. 1 and 7.2.3.2 inspection, a second non-fatal nonconformity is allowed, and those who exceed it are judged as unqualified.
The inspection of 7.2.3.3 shall meet the requirements of GB 1 1463.
The inspection in 7.2.3.4 should meet the requirements of this standard and the enterprise standard of LED display large screen.
7.3 Quality consistency check
7.3. 1 Quality conformity inspection is divided into group A inspection, group C inspection and group F inspection.
7.3.2 Group A inspection
7.3.2. 1 One set of inspection is the basic requirement inspection of large LED display screen.
The items inspected by 7.3.2.2 Group A shall conform to the provisions in the expression. The LED display screen needs to be checked one by one. Any unqualified products must be returned to the production department for repair, and then re-inspected.
7.3.2.3 Group A inspection shall be conducted by the quality inspection department of the large-screen LED display production unit or the entrusted quality inspection unit, and the ordering party may send representatives to participate.
Group c test
7.3.3. 1 C group test is an environmental adaptability test.
When the batch production of products in 7.3.3.2 is interrupted for more than months, each batch should be tested for environmental adaptability, and the products produced continuously should be tested for environmental adaptability once a year. When changing the design, process, main components and materials, environmental adaptability test should be carried out.
7.3.3.3's environmental adaptability inspection shall be conducted by the quality inspection department of the large-screen LED display production unit or the entrusted quality inspection unit. Several monitors that passed the quality consistency A test were randomly selected for environmental adaptability test.
In the whole process of environmental adaptability test in 7.3.3.4, non-lethal unqualified products of Grade II are allowed. After the repair, the inspection will continue from the unqualified items. The LED that fails the environmental adaptability test shows a large screen, and it is forbidden to leave the factory. All work-in-process and finished products need to be re-inspected, and the environmental adaptability test should be re-conducted after finding out the reasons. Quotation of large screen manufacturers 1 37 24 38 75 15
Samples that have passed the environmental adaptability test in 7.3.3.5 should be marked and should not be delivered as genuine products.
Group f test
7.3.4. 1 F group inspection is a reliability test. Sequential censoring test scheme 2-3 specified in GB 1 1463 was adopted.
7.3.4.2's mass-produced products should be tested once a year, and the products produced continuously should be tested once every two years. When the main design, process, main components and materials change, reliability tests should be conducted.
The reliability test of 7.3.4.3 shall be carried out by the quality inspection department of the large-screen LED display production unit or the entrusted quality inspection unit. According to the requirements of GB 1 1463, samples were taken from the display units that passed the quality consistency test, and the reliability test was carried out.
In 7.3.4.4, the LED that failed the reliability test shows a large screen, so it is forbidden to leave the factory. All semi-finished and finished products need to be re-inspected. After finding out the reason, conduct the reliability test again.
7.3.5 Quality conformity determination The first inspection shall meet the requirements of this specification, and the group A-F inspection shall be qualified. Quality consistency inspection is qualified.
8 Marking, packaging, transportation and storage