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Standard: General specification for LED electronic display
1 Scope
This standard specifies the definition, classification, technical requirements, inspection methods, inspection rules and marking packaging transportation and storage requirements of LED display. This standard applies to LED display products. It is LED display The main technical basis for the design, manufacture, installation, use, quality inspection and development of various technical standards and technical documents.
2 reference standard
The provisions contained in the following standards constitute provisions of this standard by reference in this standard. The versions shown are valid at the time of publication. All standards will be revised and parties using this standard should explore the possibility of using the latest version of the following standards.
GB191-90 packaging storage and transportation icon
GB2423.1-89 Basic environmental test procedures for electric and electronic products Test A: Low temperature test method
GB2423.2-89 Basic environmental test procedures for electric and electronic products Test B: High temperature test method
GB2423.3-89 Basic environmental test procedures for electric and electronic products Test Ca constant damp heat test method
GB4943-95 Security of information technology equipment (including electrical affairs equipment)
GB6388-86 transport packaging receipt and delivery mark
GB6587.4-86 Vibration measurement of electronic measuring instruments
GB6587.6-86 Electronic measuring instrument transportation test
GB6593-86 Electronic measuring instrument quality inspection rules
General technical conditions for GB9813-88 miniature digital electronic computer
GB11463-89 Reliability Test of Electronic Measuring Instruments
SJ/T10463-93 Electronic measuring instrument packaging, marking, storage requirements
 
3 definition
This standard uses the following abbreviations and definitions:
3.1 LED light-emitting diode ligth emission diode
 
3.2 LED display LED panEL is used to display various information such as text, text, graphics, images, animation, market and so on, as well as TV, video signal and display screen composed of LED device array.
 
3.3 display unit The smallest unit that constitutes an LED display that is determined by the circuit and the mounting structure and has a display function.
 
3.4 Fatal defect A defect that may result in a hazard or unsafe condition in the use, maintenance or related personnel, or an important characteristic of the unit product that does not meet the requirements or the quality characteristics of the unit product is not in conformity with the regulations.
 
3.5 Out-of-control point The illumination state does not match the display state required by the control and is a discrete LED basic light-emitting point.
 
3.6 Pseudo-color LED display The pseudo-color LED panel is equipped with LED displays of different primary color LED devices in different areas of the LED display.
 
3.7 Full-color LED display all-color LED panel is composed of red, green and blue LED devices and can display LED display with multiple colors.
 
4 classification
 
LED displays can be classified according to the following conditions:
 
4.1 Use environment The LED display is divided into indoor LED display and outdoor LED display according to the use environment.
 
4.2 Display Color The LED display is divided into single primary color LED display (including pseudo color LED display), dual primary color LED display and full color (three primary color) LED display. According to the gray level, it can be divided into 16, 32, 64, 128, 256 gray LED display.
 
4.3 Display performance The LED display is divided into text LED display, graphic LED display, computer video LED display, TV video LED display and market LED display according to display performance. The market LED display generally includes LED displays for securities, interest rates, futures, and the like.
 
4.4 Basic light-emitting point non-line type LED display, indoor LED display can be divided into Φ3mm, Φ375mm, Φ5mm, Φ8mm, and Φ10mm display according to the single-point diameter of the LED; the outdoor LED display adopts the pixel diameter Can be divided into Φ19mm, Φ22mm and Φmm26 LED display.
 
   In the market type LED display, the size of the digital tube can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6. LED display such as cm (3 inch).
 
5 Requirements
 
 
5.1 LED display hardware usage environment
     The LED display hardware part includes a general-purpose computer part, a communication line, a dedicated data conversion part, and a display part determined according to the type, area, and use site of the LED display. In the detailed specification it should be stated:
     a. Requirements for computer mainframes, various optional plug-in cards, external devices, and communication interfaces;
     b. Requirements for the communication line and indicate the maximum communication distance;
     c. The communication mode of the data conversion part and the host computer;
     d. Power supply requirements and structural installation requirements.
5.2 LED display software environment
    LED display screens with different performances should be equipped with display software that meets their display function requirements. The software has the following functions:
     a. Comply with serialization and standardization requirements, and be backward compatible;
     b. Adopt the operating system and language specified in the detailed specification;
     c. Equipped with a comprehensive self-test procedure and various levels of diagnostic procedures as needed;
     d. Equipped with special software for special purpose LED displays.
5.3 Structure and appearance
     5.3.1 Structure The LED display part can be made of steel, aluminum or wood. The structure is required to be strong and beautiful.
     5.3.2 Appearance The LED display frame has no obvious scratches. The outdoor LED display pixel tube should be installed consistently, without looseness and broken shell.
5.4 Safety requirements The LED display is a Class I safety device specified in GB4943.
     5.4.1 LED display protection ground terminal.
     5.4.2 Security Mark
     5.4.2.1 LED display protection The ground terminal shall be marked.
     5.4.2.2 The LED display shall have a warning sign at the fuse and switching power supply.
     5.4.3 Earth leakage current The earth leakage current of the LED display shall not exceed 3.5mA (AC rms).
     5.4.4 Anti-electricity strength The LED display screen shall have a dielectric breakdown of 50HZ, 1500V (AC rms) test voltage for 1min.
     5.4.5 The temperature rise of the metal part after the temperature rise of the temperature rise LED display is not more than 45K, and the temperature rise of the insulation material does not exceed 70K.
5.5 LED display performance characteristics
     The text LED display and the graphic LED display shall have the move in and out mode and display mode specified in the detailed specification.
     The computer video LED display should have:
     Animation function. It is required that the LED display animation display is consistent with the area corresponding to the computer display; the text display function. Requires text to display stable, clear crosstalk; grayscale function. It is required to have the grade gray scale specified in the detailed specification. In addition to animation, text display, and grayscale functions, TV video LED displays should be able to display TV and video images. The market LED display has the corresponding market display capability.
5.6 Uniformity The requirements for uniformity of the LED display shall be specified in the detailed specification.
5.7 Out of control points The out-of-control point of the indoor LED display is not more than three ten thousandths, and the out-of-control point of the outdoor LED display should not be less than three thousandths;
5.8 Power supply LED display power supply is 220W ± 10%, 50HZ ± 5% or 80V ± 10%, 50HXZ ± 5% should specify the maximum power consumption or LED of the display area of ​​various LED display units in the detailed specification Total display power consumption.
5.9 Environmental adaptability
    5.9.2.1 Temperature The ambient temperature of the indoor screen is: working environment low temperature: 00C; high temperature: +400C. Storage environment low temperature: -400C; high temperature: +600C.
  The ambient temperature of the outdoor screen is: low temperature in working environment: optional -200C, -100C; high temperature: +500C. Storage environment low temperature: -400C; high temperature: +600C.
    5.9.2.2 Damp heat At the highest operating temperature, the LED display should be able to operate normally with a relative humidity of 90%.
    5.9.3 Vibration The LED display screen is subjected to vibrations during transportation, loading and unloading, and handling of automobiles, trains, and airplanes. The car screen should be able to work properly during the operation of the installed vehicle.
    5.9.4 Transportation LED displays can be transported using ordinary means of transport such as cars, trains, and airplanes.
5.10 Reliability requirements The average fault-free working time MTBF (ml) of the LED display unit is not less than 10000h.
 
6 Inspection method
 
6.1 Hardware use environment of LED display The hardware use environment of LED display shall be checked by visual inspection and shall meet the requirements of 5.1.
 
6.2 Software use environment of LED display The visual inspection of the software use environment of LED display should meet the requirements of 5.2.
 
6.3 Structure and Appearance The structure and appearance of the LED display shall be checked by visual inspection and shall comply with the requirements of 5.3.
 
6.4 Safety requirements
6.4.1 Grounding The LED display shall be inspected by visual inspection and shall meet the requirements of 5.4.1.
6.4.2 Safety mark The safety mark of the LED display shall be checked by visual inspection and shall meet the requirements of 5.4.2.
6.4.3 Earth leakage current Under the 1.1 times rated power supply voltage, the ground leakage current between the LED display power cable and the metal frame shall be tested to meet the requirements of 5.4.3.
6.4.4 Anti-electric strength The LED display power switch is in the on position. Apply 1500V (AC RMS) between the power input terminal and the metal frame or accessible metal structure, 1min, which should meet the requirements of 5.4.4.
6.4.5 Temperature rise The LED display shall measure the temperature of each accessible point with a thermometer after one hour of operation, and shall meet the requirements of 5.4.5.
 
6.5 Performance characteristics According to the different types of LED display, the performance characteristics of the LED display should be checked to meet the requirements of 5.5. Use the display test software for the text and graphic LED display to check the move in and out mode and display mode through visual inspection. Through the visual inspection of the computer video LED display screen, the computer animation is used to compare and check the animation function, and the LED display screen and the computer monitor are used to check the text display function, and the special grayware function is checked by the special test software. In addition to the above animation, text, and grayscale function check on the TV video LED display, there should also be a video source to check the TV and video functions. For various market LED displays, the corresponding test software should be used to check the market display function.
 
6.6 Uniformity Visual inspection of the uniformity of the LED display shall meet the requirements of 5.6.
 
6.7 Out of control points Visual inspection of the out of control points of the LED display shall meet the requirements of 5.7.
 
6.8 Power supply The wattmeter is used to measure the power supply power of the LED display, which should meet the requirements of 5.8.
 
6.9 Environmental adaptability
6.9.1 High-temperature load test The high-temperature load test shall be carried out on the display unit in accordance with the provisions of GB2423.2. For indoor screens under (40±2)0C conditions, the outdoor screen shall be energized for 8 hours under conditions of (50±2)0C, each Check once in hours. Check the text input and removal mode, display mode, uniformity and out of control point on the text LED display and graphic LED display. Check the animation function, text display function, grayscale function, uniformity and runaway of computer video and TV video LED display Point. Check the market display function of the market LED display. Both should meet the requirements of 5.5, 6.6 and 5.7.
6.9.2 High-temperature storage test The high-temperature storage test is carried out according to the provisions of GB2423.2. The storage unit is stored under the condition of (60±2)0C for 4h, and after recovering for 4h at room temperature, the text LED display and diagram The LED display screen checks the shifting in and out mode, display mode, uniformity and out of control points. Check the animation function, text display function, grayscale function, uniformity and out of control points on the computer video and TV video LED display. The market display function check of the market LED display should meet the requirements of 5.5, 5.6 and 5.7.
 
6.9.3 Damp heat load test The damp heat load test shall be carried out on the display unit in accordance with the provisions of GB2423.3. For indoor screens at (40 ± 2) 0 C, relative humidity of 87% - 93%, for outdoor screens (50 ±2)0C, 8H for the relative humidity of 87%-93%, and check once every hour. Check the move-in and move-out mode, display mode, uniformity and out-of-control point on the text LED display and the graphic LED display. Check the market function of the market LED display. Both should meet the requirements of 5.5, 5.6 and 5.7.
6.9.4 Constant damp heat test Constant damp heat test shall be carried out on the display unit according to the provisions of GB2423.3. For indoor screens at (40±2)0C, relative humidity is 87%-93%, the outdoor screen is at (50± 2) 0C, storage of 48H under conditions of relative humidity of 87%-93%. Immediately after the storage test, the measurement of earth leakage current, electric strength and temperature rise shall be carried out, and the requirements of 5.4.3, 5.4.4 and 5.4.5 shall be met. After recovering 4H in the room temperature environment, check the text LED display and the graphic LED display screen to move in and out, display mode, uniformity and out of control points. For computer video and TV video LED
 
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