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. 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 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
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.
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.
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 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.
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 and 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.
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 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, 375mm, 5mm, 8mm and 10mm according to the diameter of LED single point. Outdoor LED displays can be divided into 19mm, 22mm, mm26 and other LED displays 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).
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;
C. Communication mode between the data conversion part and the computer host;
D. power supply requirements and structural installation requirements.
5.2 Software environment of LED display screen
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.
5.3.2 Appearance There is no obvious scratch on the outer frame of LED display screen. Outdoor LED display pixel tube installation should be consistent, and the shell is not loose or damaged.
5.4 Safety Requirements 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 of LED display screen shall not exceed 3.5mA (AC effective value).
5.4.4 The resistance LED display screen can be tested at 50HZ and 1500V (AC effective value), and the test voltage is 1min, so there should be no insulation breakdown.
5.4.5 Correct use of temperature-rising LED display screen, after reaching thermal balance, the temperature rise of metal parts and insulating materials should not exceed 45K and 70K.
5.5 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 animation display of LED display screen is consistent with the display of corresponding area of computer monitor; 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 market LED display screen has the corresponding market display ability.
5.6 Uniformity The uniformity requirements of the 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 it is distributed.
5.8 Power Supply The power supply of the LED display panel is 220W 10%, 50HZ5% or 80V 10%, and the maximum power consumption per unit display area or the total power consumption of the LED display panel should be specified in the detailed specifications for 50HXZ5%.
5.9 Environmental adaptability
5.9.2. 1 temperature The ambient temperature of the indoor screen is: low working temperature: 00C；; High temperature:++400°C. Low storage temperature:-400 C; High temperature: +600 degrees Celsius.
The ambient temperature of the outdoor screen is: low working temperature: optional -200C,-100 C; High temperature:+500 C. Low storage temperature:-400 C; High temperature: +600 degrees Celsius.
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 The vibrating LED display screen bears the vibration of automobiles, trains and airplanes. In the process of transportation, loading and unloading and moving. The on-board screen should be able to work normally when the installed vehicle is running.
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 mean time between failure (MTBF(ml)) of the LED display device should not be less than10000h. ..
6 test method
6.1Hardware environment of LED display screen The hardware environment of LED display screen shall meet the requirements of 5. 1 by visual inspection.
6.2 Software environment of LED display Visual inspection of the software environment of LED display should meet the requirements of 5.2.
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 requirements of Article 5.4.3.
6.4.4 The power switch of the resistive LED display screen is in the ON position, and a voltage of 1500V (AC effective value) 1 min is applied between the power input terminal and the metal frame or accessible metal structure, which shall meet the requirements of 5.4.4.
6.4.5 The temperature of each touchable point of the temperature-rising LED display screen shall be tested with a point thermometer after working for one hour, 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. Visually inspect the computer video LED display screen, compare and check the animation function by displaying computer animation, check the text display function by LED display screen and computer monitor, and use special test software.
Check its gray function. In addition to the above animation, text and grayscale functions, the TV video LED display screen should also have the function of viewing TV and recording with video source. For various market LED display screens, the corresponding test software should be used to check the market display function.
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 supply of the LED display screen with a wattmeter, which shall meet the requirements of 5.8.
6.9 Environmental adaptability
6.9. 1 high-temperature load test The display unit shall be subjected to high-temperature load test according to the provisions of GB2423.2. The indoor screen shall be powered on at (402)0C, and the outdoor screen shall be powered on at (502)0C for 8h, and shall be checked once an hour. Check the moving-in and moving-out mode, display mode, uniformity and out-of-control points of text LED display and graphic LED display; 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 (602)0C for 4 hours, and restored at room temperature for 4 hours. Then, check the moving-in and moving-out mode, display mode, uniformity and out-of-control point of text LED display and graphic LED display. Check the animation function, text display function, gray scale function, 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, which shall meet the requirements of 5.5, 5.6 and 5.7.
6.9.3 Wet and heat load test The wet and heat load test shall be carried out on the display unit according to GB2423.3. The indoor screen shall be powered on at (402)0C and the relative humidity is 87%-93% for 8 hours, and the outdoor screen shall be powered on at (502)0C and the relative humidity is 87%-93% for 8 hours, and shall be checked 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 quotation function of the quotation LED display. The requirements of 5.5, 5.6 and 5.7 shall be met.
6.9.4 Constant temperature, humidity and heat test The display unit shall be tested at constant temperature, humidity and constant temperature according to GB2423.3. The indoor screen shall be stored at (402)0C and the relative humidity is 87%-93% for 48H, and the outdoor screen shall be stored at (502)0C and the relative humidity is 87%-93% for 48h. 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. After recovering at room temperature for 4 hours, check the moving-in and moving-out modes, display modes, uniformity and out-of-control points of text LED display and graphic LED display, and check the moving-in and moving-out modes, display modes, uniformity and out-of-control points of computer video and TV video LED display. Check the animation function, text display function, gray scale function, uniformity and out-of-control points of computer video and TV video LED display screens, and check the market display function of market LED display screens, which shall 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 the test, check the move-in and move-out modes, display modes, uniformity and out-of-control points of text LED display, graphic LED display and graphic LED display. 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. They should all 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 taxi class cycle conditions specified in GB6587.6. After the test, the entry and exit modes, display modes, 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. Check the market display function of market LED display screen, which shall meet the requirements of 5.5, 5.6 and 7. The LED display screen working on the vehicle shall 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。 Reliability verification tests are also allowed according to the contract.
High quality LED display screen 158- 1558-9234
7 inspection rules
7. 1 inspection items
This product is used for identification inspection and quality consistency inspection. The inspection rules conform to the relevant provisions in GB 6593, and the inspection items and requirements conform to the provisions in table 1.
Inspection items and requirements of table 1 LED display screen
test item
Appraisal inspection
Quality consistency test
technical requirement
(Chapter number)
test method
(Chapter number)
design
produce
Group a
Group c
Group f
Environmental pollution caused by hardware use
-
-
5. 1
6. 1
Software use environment
-
-
5.2
6.2
Appearance and structure
-
-
5.3
6.3
Safety requirements
-
-
5.4
6.4
operating characteristic
-
-
5.5
6.5
be of the same race
-
-
5.6
6.6
Out of control point
-
-
5.7
6.7
Power?Supply?
-
-
5.8
6.8
environment
-
-
5.9
6.9
reliability
-
-
5. 10
6. 10
field service
-
-
-
According to enterprise standards
According to enterprise standards
For items that must be inspected; Items that can be selected for inspection; -For unchecked 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 selected a set of display units from the 7.2.3. 1 LED display screen that passed the inspection, and carried out environmental adaptability inspection on schedule.
7.2.3.3 appraised the LED display screen as scheduled. 10. adopt the test scheme of timing truncation specified in GB 1 1463.
7.2.3.4 conducted a field test on the designed and identified LED display screen.
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 shall meet the requirements of this standard and the enterprise standard for LED display.
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 LED display screen.
The items inspected by 7.3.2.2 Group A shall conform to the provisions in the expression. The LED display screens should be checked one by one. Any unqualified products should be returned to the production department for maintenance.
After that, re-provide the inspection.
7.3.2.3 Group A inspection shall be conducted by the quality inspection department of the 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.
For products mass-produced in 7.3.3.2, when the production interruption time exceeds months, each batch shall be tested for environmental adaptability, and products continuously produced shall be tested once a year.
Environmental adaptability test. When changing the design, process, main components and materials, environmental adaptability test should be carried out.
7.3.3.3 environmental adaptability inspection shall be conducted by the quality inspection department of the 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.
LED displays that fail the environmental adaptability test are prohibited from leaving the factory. All semi-finished and finished products need to be re-inspected. After finding out the reason,
Re-test environmental adaptability.
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, and the main design and engineering should be changed.
Art, main components and materials should be tested for reliability.
7.3.4.3 reliability test shall be conducted by the quality inspection department of the LED display production unit or the entrusted quality inspection unit. Significantly qualified in the quality consistency test.
According to the requirements of GB 1 1463, samples are taken from the display unit for reliability test.
In 7.3.4.4, LED display screens that failed the reliability test are prohibited from leaving the factory. All semi-finished and finished products need to be re-inspected. Find out why and start over.
Conduct reliability tests.
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.
High quality LED display screen 158- 1558-9234
8 Marking, packaging, transportation and storage
The packaging, marking and storage of LED display screen shall meet the requirements of SJ/T 10463.
8. 1 logo
8. 1. 1 product logo
8. 1. 1. 1 nameplate shall be installed in an appropriate position on the led display screen.
8. 1. 1.2 nameplate shall include the following contents.
A. trademarks;
B. product name or model;
C. date of production;
D. name of manufacturer.
8. 1.2 packing mark The outer box mark on the LED display screen shall meet the requirements of GB6388.
A. product model and name;
B. trademarks;
C. name of the manufacturer;
D there are graphic signs such as "upward", "handle with care" and "fear of moisture", which shall comply with GB 19 1.
Indicate the product quantity, gross weight and packaging date.
8.2 packaging
8.2. 1 should be packed in a packing box that meets the requirements of the outer packing mark.
8.2.2 Packaging shall meet the requirements of moistureproof, shockproof and anticorrosion.
8.2.3 Each batch of packing boxes shall have the product inspection certificate, packing list, spare parts list and random document list in the calibration box.
8.3 Packaged products can be transported by any means, but rain, long-term exposure, contact with corrosive gases and mechanical damage should be avoided during transportation.
8.4 The storage temperature range of the storage LED display screen is 0-400C, the relative humidity is not more than 80%, and the surrounding environment is free of acid, alkali and corrosive gases, strong mechanical vibration, impact and strong magnetic field.