This standard to retain the original standards of most of the content. In accordance with the new version of the standardization of guidelines, standards of conduct amended; accordance with the standards used in the need for an increase of LED displays and related terms and definitions; by an increase of pixels from the center of the LED display categories; in the structure and appearance Cited aspects of electrical and electronic products, standards protective shell, an increase of pixels from the Center for accuracy and flatness of the request; in the optical properties of LED display, the largest increase in brightness, perspective, color wavelength of the main error, the white color coordinates of the field and the highest contrast ratio Requirements; LED display in the electrical properties, an increase of gray level, frame-for-frequency and refresh rate.
This standard by the China Electronics Standardization Institute (CESI) focal point.
The main criteria for the drafting of this unit: LED standardization working group
The main drafters of this standard: Lu Pengfei, Zhu Baohua, Lu Rongqing, Chun-Hung, Cheng poetry, Wang Feng, and so on.
This standard in place of the standard version: SJ / T 11141-1997.
LED displays general specification
1 scope
The present standard LED display provides for the definition, classification, technical requirements, testing will be used to examine the rules, as well as signs, packaging, transportation, storage requirements.
This standard applies to LED display products. It is the LED display product design, manufacturing, testing, installation, inspection, use, quality testing and the development of technical standards, technical documents mainly based on the technology.
2 normative reference document
The following documents through the terms of reference of this standard and become the standard terms. Note the date of any reference document for all subsequent changes alone (not including the contents of errata) or revised edition of the standards are not applicable to the present, however, under this standard to encourage the parties to reach an agreement to study the possibility of using the latest version of these documents . Note the date of which are not in the documents cited, the latest version of the application of this standard.
GB 191-2000 packaging storage and transportation mark icon
GB 2423.1-2001 electrical and electronic products, basic environmental test pilot order A: Low-temperature test method
GB 2423.2-1989 electrical and electronic products, basic environmental test pilot order B: high-temperature test method
GB 2423.3-1993 electrical and electronic products, basic environmental test pilot order Ca: constant thermal test method
GB 4208-1993 electrical and electronic products, standards protective shell
GB 4943-2001 information technology equipment (including electrical equipment, services) security
GB 6388-1986 transportation package delivery closed signs
GB 6587.4-1986 electronic measuring instruments vibration test
GB 6587.6-1986 electronic measuring instruments transport test
GB 6593-1996 electronic measuring instruments quality rules
GB 9813-2000 microcomputer general specification
GB 11463-1989 test the reliability of electronic measuring instruments
SJ / T 10463-1993 electronic measuring instruments packaging, labeling, storage requirements
SJ / T 11281-2003 LED screen test
3 Terms and definitions
The following terms and definitions apply to this standard
3.1
LED Light emitting diode
LED light-emitting diodes are the initials (of the specific standards for visible light).
3.2
LED display LED panel
Through a certain degree of control by the LED devices composed of an array of display screen.
3.3
Two-color LED display two basic color LED panel
By the red, green and blue color in any two-color LED devices composed of the LED display.
3.4
Full-color LED display full-color LED panel
By the red, green and blue LED devices composed of three primary colors of the LED display.
3.5
Brightness light
LED display on the unit area of luminous intensity. : Candela / m 2 (cd/m2).
3.6
Gray-level gray scale
LED display with a brightness in the dark from the brightest to be able to distinguish between the brightness of the series.
3.7
Pixel pixel
LED display of the smallest imaging unit.
3.8
Center-pixel accuracy from the precision of dot pitch
LED display pixels from the center measured and nominal value of the absolute poor and the nominal value of the ratio.
3.9
Module display module
By the number of pixels show the composition, structure independent of the smallest components of LED display modules.
3.10
Display module display module group
By the circuit to determine the structure and installation of the display with LED display composed of independent units.
3.11
Flatness level up degree
Light-emitting diodes, pixel, display modules, display modules in the composition of the LED display when the plane's deviation die.
3.12
Maximum brightness maximum brightness
Under certain environmental illumination, LED display the color gray at the highest level to a maximum brightness when the brightness. Full-color LED display also includes a state of the brightness of white balance.
3.13
Angle viewing angle
To observe the direction of the LED display brightness down to the direction of normal brightness of the half, the same plane and direction of the normal two to observe the direction of the angle into. Into perspective and the level of vertical perspective.
3.14
The main color Errors wavelength difference of main wavelength of basic color
Color LED display the dominant wavelength and the nominal value of the measured difference.
3.15
The highest contrast ratio of maximum contrast ratio
Under certain environmental illumination, LED display brightness and maximum brightness of the background over.
3.16
Pixels out of control out-of-control pixel
And control state light-emitting display requirements of the state does not match the LED pixels.
3.17
Frame-for-frequency refresh frame frequency
LED screen displays the frequency of information updates.
3.18
Refresh rate refresh ratio
LED displays show the data per second to be repeated more frequently.
3.19
Fatal unqualified critical defect
The use, maintenance of the product or, for that matter may cause damage or unsafe conditions in failed, or the quality of the important characteristics of the products do not meet requirements or product quality characteristics of serious non-compliant.
4 classification
4.1 Use the environment
LED display is divided into the environment by the use of indoor and outdoor LED display LED display.
4.2 color display
LED display shows color by color LED display is divided into single, two-color LED display and full-color LED display.
4.3 display
LED display screen according to the text is divided into LED display, LED graphic display, LED video displays and LED display market and so on.
4.4 pixel
4.4.1 pixel diameter
LED display can be used in diameter LED pixels classification.
4.4.2 digital pipe size
LED digital display can be used in tube size classification.
4.4.3 pixels from the center
LED display pixel can be classified away from the center.
4.4.4 LED package
LED display can be used in LED package in the form of classification.
5 request
5.1 LED display hardware environment
LED display, including some of the hardware part of the control, communications and some part of the show.
In the detailed specifications should be based on the classification of LED display for the corresponding note:
a) control of part of the host, in the matching card, external communications equipment and interface requirements;
b) the requirements of the communications cable and marked the largest distance communications;
c) data transfer part of the host computer and communication;
d) the structure of power supply requirements and installation requirements.
5.2 LED display of the software environment
Different functions of the LED display can be configured to meet the requirements of the display shows that software.
5.3 Structure and appearance
5.3.1 Structure
LED display screen may be part of the structure of the steel, aluminum, plastic material, such as requiring a solid structure.
5.3.2 Appearance
LED display no obvious scratches. Outdoor LED display pixel pipes should be installed, without loosening of the shell and tube rupture.
5.3.3 protective shell level
LED display case should meet the level of protection in GB 4208. Indoor LED-screen display of not less than IP 20, an outdoor LED-screen display of not less than IP 33.
5.3.4 away from the center pixel precision
LED display pixel accuracy from the center should be not more than 15 percent.
5.3.5 flatness
Flatness of the LED display should be no greater than 2.5 mm.
5.4 Safety Requirements
GB 4943 is an LED display provides the I-type safety equipment.
5.4.1 Ground
LED display should be the protection of ground terminals.
5.4.2 security tags
5. 4. 2. 1 LED screen to protect ground terminals should be marked.
5. 4. 2. 2 LED display at the Department fuse and switching power supply should be a warning sign.
5.4.3-to-ground leakage current
LED display for the leakage to be no more than 3.5 m A (AC RMS).
5.4.4 Anti-intensity electric
LED screen display module can withstand 50 Hz, 1500 V (AC RMS) 1 min of the test voltage insulation breakdown should not have happened.
5.4.5 temperature rise
LED display in the normal use of heat to achieve balance, the screen part of the metal structure of the temperature rise no more than 45 K, insulation temperature rise of no more than 70 K.
5. 5 LED display features
LED text display should have the text display.
LED graphic display should have the text and graphics functions.
LED video display should have the text display, animated features and video screenings.
LED display market should have its corresponding ability to display prices.
5. 6 LED display optical performance
5.6.1 maximum brightness
Details should be provided to the norms of the largest LED screen brightness.
5.6.2 Perspective
Should be detailed specifications on the LED display provides perspective.
5.6.3 uniformity
Should be detailed specifications on the LED display provides uniformity.
5.6.4 at the main color Errors
Should be detailed specifications on the LED display provides the main color wavelength error.
5.6.5 white color coordinates of the field
Details should be provided to the norms of white LED display color coordinates of the field.
5.6.6 the highest contrast ratio
Should be detailed specifications on the LED display provides the highest contrast ratio.
5. 7 LED display electrical properties
5.7.1 pixel rate of loss of control
Indoor LED display pixel rate of loss of control should be not more than three ten thousandths, outdoor LED display pixel rate of loss of control should be not more than two thousandths; and for the discrete distribution.
5.7.2 gray level
Details should be provided to the norms of gray-level LED display.
5.7.3-for-frame frequency
Should provide for detailed specification for LED display frame frequency.
5.7.4 refresh rate
Details should be provided to the norms LED screen refresh rate.
5.8 power supply
LED display of power supply for the 220 V (1 disabilities 10%), 50 Hz (1 person 5%) or 380 V (1 disabilities 10%), 50 Hz (1 soil 5%).
Details should be provided for the regulation of various types of LED display units in the area showed the largest LED screen or the power of the total power consumption.
5.9 Environmental Adaptability
5.9.1 part of the control and communication parts
Part of the control and communications should be part of the working conditions meet the requirements of GB 9813, in 10 ℃ ~ 35 ℃ room temperature conditions. As part of the control or communication with the part of the show is installed in the same part of the working environment should meet the requirements of 5.9.2.
5.9.2 part of the show
5.9.2.1 recommended temperature range
Indoor LED display for the ambient temperature:
Working environment temperature: 0 ℃; high temperature: 40 ℃.
Low-temperature storage conditions: -40 ℃; high temperature: 60 ℃.
Outdoor LED display for the ambient temperature:
Low-temperature working environment: optional -30 ℃, -20 ℃, -10 ℃, 0 ℃; high temperature: 50 ℃.
Low-temperature storage conditions: -40 ℃; high temperature: 60 ℃.
5.9.2.2 warm
Working at the highest temperature, LED display should be able to relative temperature of 90% of the normal working conditions.
5.9.3 Vibration
LED display can afford cars, trains, aircraft, such as transport, handling, moving in by the vibration. On-board should be able to screen installed in the vehicles running normally.
5.9.4 Transport
LED display can be used automobiles, trains, aircraft carriers, such as general transportation.
5.10 reliability requirements
LED display module shows the average trouble-free working hours MTBF (ml) of not less than 10 000h.
6 test
6.1 LED display hardware environment
Visual inspection by way of LED display hardware environment, should meet the requirements of 5.1.
6.2 LED display of the software environment
Visual inspection with the way the software LED display, should meet the requirements of 5.2.
6.3 Structure and appearance
6.3.1 Structure
By way of visual inspection of the structure of the LED display, should meet the requirements of 5.3.1.
6.3.2 Appearance
Visual inspection with the way the appearance of the LED display, should meet the requirements of 5.3.2.
6.3.3 protective shell level
LED display shells GB 4208 in accordance with the level of protection provided for in the way, should meet the requirements of 5.3.3.
6.3.4 away from the center pixel precision
With an accuracy of 0.02 mm measuring common measurement of the LED screen pixel accuracy from the center should meet the requirements of 5.3.4.
6.3.5 flatness
With an accuracy of 0.02 mm universal measuring measuring flatness of the LED display, should meet the requirements of 5.3.5.
6.4 Safety Requirements
6.4.1 Ground
Visual inspection by way of LED display, should meet the requirements of 5.4.1.
6.4.2 security tags
Visual inspection by way of LED displays the security tag, should meet the requirements of 5.4.2.
6.4.3-to-ground leakage current
At 1.1 times the rated voltage power supply, LED display to test the power cord to the metal frame of the Inter-to-ground leakage current, should meet the requirements of Article 5.4.3.
On its analysis of the circuit it is clear that Earth leakage current than 3.5 mA, but no more than 5% of the input current of the LED screen, its randomly selected for the display module-to-ground leakage current test, should meet 5.4.3 Article.
6.4.4 Anti-intensity electric
LED display's power switch in position in the AC power input with the metal frame or touch the metal structure imposed between 1500 V (AC RMS), 1 min, should meet the requirements of 5.4.4.
6.4.5 temperature rise
LED display work at full capacity in 30 min after testing the temperature of dollars to touch point temperature, should meet the requirements of 5.4.5.
6. 5 LED display features
According to the different types of LED displays, LED display on the features of the inspection should meet the requirements of 5.5.
• LED display text on the visual check through the text display.
• LED display of graphic visual check through the text and graphics display.
• LED video displays with LED displays, through visual and computer monitors compare check text display, showing comparative examination of computer animation feature animation, and video applications check the source of video screenings.
• LED display on a variety of prices should be used to test the appropriate software to check their display market.
6. 6 LED display optical performance
6.6.1 maximum brightness
In accordance with SJ / T 11281 in the method of inspection provided for in the largest LED screen brightness, and should meet the requirements of 5.6.1.
6.6.2 Perspective
In accordance with SJ / T 11281 stipulated in the method of inspection LED display perspective, should meet the requirements of 5.6.2.
6.6.3 uniformity
In accordance with SJ / T 11281 stipulated in the method of inspection of the LED display uniformity, should meet the requirements of 5.6.3.
6.6.4 at the main color Errors
In accordance with SJ / T 11281 stipulated in the method of checking color LED display at the main error, should meet the requirements of 5.6.4.
6.6.5 white color coordinates of the field
In accordance with SJ / T 11281 stipulated in the method of inspection LED display white color coordinates of the field should meet the requirements of 5.6.5.
6.6.6 the highest contrast ratio
In accordance with SJ / T 11281 stipulated in the method of inspection LED displays the highest contrast ratio, should meet the requirements of 5.6.6.
6. 7 LED display electrical properties
6.7.1 pixel rate of loss of control
By way of visual inspection of the LED screen pixel out of control, should meet the requirements of 5.7.1.
6. 7.2 gray level
In accordance with SJ / T 11281 stipulated in the method of inspection LED display gray level, should meet the requirements of 5.7.2.
6.7.3-for-frame frequency
In accordance with SJ / T 11281 stipulated in the method of inspection for LED display frame frequency, should meet the requirements of 5.7.3.
6.7.4 refresh rate
In accordance with SJ / T 11281 stipulated in the method of inspection LED screen refresh rate should meet the requirements of 5.7.4.
6.8 Power Supply
Using Watt LED screen measuring, and other forms of electricity power supply should meet the requirements of 5.8.
6.9 Environmental Adaptability
6.9. A high-temperature stress test
High-temperature stress test in accordance with the provisions of GB 2423.2 on display module. On the screen in the room (40 ± 2) ℃ under the conditions of the external screen in the room (50 persons 2) ℃ under the conditions of work of the electricity 8h, one test per hour. LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.2 low-temperature stress test
Low-temperature stress test in accordance with the provisions of GB 2423.1 on display module. In the provision of electricity at low temperatures work 8h, one test per hour. LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.3 High-temperature storage test
High-temperature storage test according to the provisions of GB 2423.2 on display module. In (60 persons 2) ℃ under the conditions of storage 4h, at room temperature to resume after 4h, the LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.4 low-temperature storage test
High-temperature storage test according to the provisions of GB 2423.1 on display module. In the (-40 ± 3) ℃ under the conditions of storage 4h, at room temperature to resume after 4h. LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.5 heat stress test
Heat stress test in accordance with the provisions of GB 2423.3 on display module. On the screen in the room (40 ± 2) ℃, relative humidity of 87% to 93% under the conditions of the external screen in the room (50 ± 2) ℃, relative humidity of 87% to 93% of the electricity under the conditions of work 8h, each Hours to carry out a check. LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.6 constant heat test
Constant heat test according to the provisions of GB 2423.3 on display module. On the screen in the room (40 ± 2) ℃, relative humidity of 87% to 93% under the conditions of the external screen in the room (50 ± 2) ℃, relative humidity of 87% to 93% under the conditions of storage 48h. Storage end of the test immediately after the earth leakage current, electrical resistance and temperature rise of the intensity measurement, should meet the requirements of 5.4.3,5.4.4,5.4.5. And then at room temperature environment to resume after 4h, the LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.7 vibration test
GB 6587.4 vibration test according to the provisions of the display module. In the frequency of vibration 5 Hz ~ 55 Hz ~ 5 Hz, the amplitude of 0.19 mm for the conditions, 5 min scan time, the direction of two in each direction, the second scan. After the test, the LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1.
6.9.8 Transport Test
GB 6587.6 test by transport provided for the flow of the three conditions for the display module. After the end of the trial. LED display on the features and functions of pixels out of control, such as the rate of inspections. Should meet the 5.5 and 5.7.1. Mobile work on the LED display, should be on-site transport pilot.
6.10 reliability test
LED display of working hours MTBF GB 11463 according to the provisions of the display module (less than 1024 pixels). α = 20%, β = 20%, Dm = 3.0.
7 test project
7.1 Test Project
Identification of this product into the consistency and quality inspection test, test GB 6593 in accordance with the rules of the relevant provisions of its testing requirements and in accordance with Table 1.
7.2 Identification Test
7.2.1 identified by the inspection unit responsible for carrying out quality testing.
7.2.2 sampling and testing project
7.2.2. 1 on the LED display hardware, software environment, structure and appearance of the safety requirements, functional properties, optical properties, electrical properties, check the power supply should meet the requirements of 5.1 to 5.8.
Table 1 LED screen test and requirements of the project
Pilot project
Identification Test
Consistency of quality inspection
Technical requirements
(Chapter No. Article)
Test
(Chapter No. Article)
Design
Yield
Group A
Group C
Group F
Environmental pollution, the use of hardware
●
●
●
--
--
5.1
6.1
The use of the software environment
●
●
●
--
--
5.2
6.2
The appearance and structure of the
●
●
●
--
--
5.3
6.3
Security requirements
●
●
●
--
--
5.4
6.4
Performance characteristics
●
●
●
--
--
5.5
6.5
Uniformity
●
●
●
--
--
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
The use of the site
●
0000
--
--
--
According to the standard rate
According to the standard rate
● must be tested for the project; 0000 have the option to test the project; - not for the test.
7.2.2.2 from the test 7.2.2.1 qualified LED display random sets display module by 5.9 adaptive environmental testing.
7.2.2.3 identification of the LED screen in accordance with the requirements of 5.10 for reliability test. GB 11463 to adopt the provisions of the few from time to time will be censored test program 1-2.
7.2.3 Criteria for qualified
7.2.2.1,7.2.2.2 in the test, allowed the second non-fatal failure, than those sentenced to up to standard.
7.2.2.3 The test should be in line with the GB 11463.
7.3 quality consistency test
7.3.1 consistency of the quality inspection test is divided into A group, C group and test group F test.
7.3.2 A test group
7.3.2.1 A group of test items according to Table 1. LED display to be 100% tested. A failure of any products to be returned to the rehabilitation sector, to provide re-examination.
7.3.2.2 A test group by the LED display production quality testing commissioned by the quality inspection departments or units responsible for carrying out, can be represented in the order.
7.3.3 C group test
7.3.3.1 mass production of products, the production gap between the more than twelve months, each test should be carried out environmental adaptation, produced every two years in a row to conduct a test environment adaptability. Changes in design, technology, the main components and materials, adaptation to environmental testing.
7.3.3.2 adaptive testing by the Environmental LED display production quality inspection departments or units responsible for the commission to conduct quality testing. A group of consistency in the quality check of the display modules in random sets, environmental adaptation test.
7.3.3.3 adaptive testing environment in the whole process allowed the second non-fatal failure. Restored after emerging from the failure of the project to continue to play such a test. Adaptation to the environment of the LED screen test failed to prohibit the factory. And the need for all of the products and finished products for re-examination. To find out the reasons for re-examination of environmental adaptation.
7. 3. 4 F test group
Section 7.3.4.1 F test for the reliability of the test. GB 11463 to adopt the provisions of the truncated sequential test program 2-3.
7.3.4.2 mass production of products, should be conducted every two years to verify the reliability of testing, the major change in design, technology, the main components and materials to carry out reliability tests.
7.3.4.3 reliability of the test by the LED display production quality testing commissioned by the quality inspection departments or units responsible for carrying out. Check the consistency in the quality of the display module in accordance with the requirements of GB 11463 samples, test reliability.
7.3.4.4 on the reliability of the test failed when the LED display, the prohibition of the factory. And the need for all of the products and finished products for re-examination. Find out the cause of the problem after the re-test reliability.
7.3.5 qualified to determine the quality of
Each test should conform to the specifications, A group, C group, F inspection team should be qualified.
8 signs transportation package store
LED display packaging, labeling and storage should be in line with the SJ / T 10463.
8.1 marks
8.1 .1 product logo
8.1.1.1 should be in the proper location of the LED screen installed on the nameplate.
8.1.1.2 nameplate to be included in the following
a) trademarks;
b) the product name or model;
c) the date of production;
d) 000 factories.
8.1.2 packaging logo
LED display signs outside the box should be in line with the requirements of GB 6388:
a) model with the name of the product;
b) trademarks;
c) 000 factories;
d) "upward", "Handle with care" and "fear of wetlands" icon marks, the marks should be in line with the GB 191.
e) indicate the number of products, gross weight and date of packing.
8.2 Packaging
8.2.1 use the logo in line with the provisions of the outer packaging cases.
8.2.2 packaging subject to moisture, vibration, corrosion requirements.
8.2.3 each case should be in the demarcation of the box with the product certification testing, packing list, annex a list of spare parts and random list of documents.
Transport 8.3
Packaged product can be used any means of transport, during transport to avoid rain and snow hit rain, the sun drying for a long time, contact with corrosive gas and mechanical damage.
8.4 storage
LED display storage temperature range of 0 ℃ ~ 40 ℃, relative humidity of not more than 80% of the surrounding environment and the corrosive acid-free gas, with no strong mechanical vibration, shock and strong magnetic field.
