T/SLDA 001—2022
Replace T/SLDA 01—2020
Posted by 2022-11-15 2022-11-15 Implemented
Shenzhen Lighting and Display Engineering Industry Association
Contents
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification of display screens
4.1 Classification by chip structure
4.2 Classification by Package Bracket
4.3 Classification by maintenance method
4.4 Classification by Display Dimension
4.5 Classification by Screen Shape
5 Technical Requirements
5.1 General Provisions
5.2 Appearance
5.3 Structure
5.4 Basic Function
5.5 Interface Requirement
5.6 Safety Requirements
5.7 Optical Property
5.8 Electrical Requirement
5.9 Pixel Runaway Rate
5.10 Energy Saving Requirements
5.11 Climate Adaptability
5.12 Mechanical Environment Adaptability
5.13 Power Supply Adaptability
5.14 Electromagnetic Compatibility
5.15 Noise
5.16 Mean Working Time Between Failures
6 Test Methods
6.1 Standard Conditions
6.2 Test Instruments and Software
6.3 Appearance
6.4 Structure
6.5 Basic Functions
6.6 Interfaces
6.7 Safety Requirements
6.8 Optical Characteristics
6.9 Electrical Requirements
6.10 Pixel Failure Rate
6.11 Energy Efficiency
6.12 Environmental Adaptability
6.13 Mechanical Adaptability
6.14 Power Supply Adaptability
6.15 Electromagnetic Compatibility
6.16 Noise
6.17 Mean Time Between Failures (MTBF)
7 Inspection Rules
7.1 General Provisions
7.2 Display Module Evaluation Test
7.3 Display Quality Consistency Inspection
7.4 Test Items and Sequence
7.5 Sampling and Grouping Rules
7.6 Determination Rules
8 Markings, Labels, and Accompanying Documents
8.1 Markings
8.2 Sign
8.3 Accompanying Documents
9 Packaging, Transportation, and Storage
9.1 Packaging
9.2 Transportation
9.3 Storage
10 Application Environment Requirements
Appendix A
References
Introduction
This document has been drafted by GB/T 1.1—2020 “Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents.”
This document replaces T/SLDA 01—2020 “General Technical Specifications for Mini LED Commercial Displays” and adheres to the revised document structure and formatting standards of GB/T 1.1—2020.
Compared to T/SLDA 01—2020, the changes in the editorial structure are as follows:
a) Technical requirements are categorized into 15 aspects: appearance, structure, basic functions, interface requirements, safety requirements, optical characteristics, electrical requirements, pixel fault rate, energy efficiency requirements, climate and environmental adaptability, mechanical environmental adaptability, power supply adaptability, electromagnetic compatibility, noise, and mean time between failures.
b) The content of testing methods has been adjusted to correspond with the technical requirements.
c) Content from the appendix of T/SLDA 01—2020 has been integrated into the main text. Major content changes compared to T/SLDA 01—2020 include:
a) Addition of the term and definition for “Mini LED Screen,” see 3.4.
b) Modification of the definition for “Mini LED Display,” see 3.5.
c) Revisions to “Classification by Packaging and Mounting” and “Classification by Screen Shape,” see 4.2 and 4.5.
d) Consolidation of color consistency and marking requirements into appearance requirements, with improvements to the indicator range in Table 2, see 5.1.
e) Addition of basic requirements in structure requirements, classification of structural dimensions, Mini LED adhesion, structural assembly precision, and resource sustainability into structural requirements, see 5.2.
f) Upgraded technical indicators for flatness, pixel center spacing deviation, etc., see Table 4.
g) For the addition of basic functionality requirements for assembled displays, see 5.3.
h) Standardize the physical interface requirements in the interface section; see 5.4.1.
i) Safety requirements now combine electrical safety and visual health requirements, see 5.5. “Optical Safety Requirements” has been removed and replaced with “Visual Health” requirements for display content.
j) Addition of color gamut visibility angle in optical characteristics, applicable in relevant scenarios, see 5.6.3.
k) Modification of white field color coordinates to standard color temperature coordinates, see 5.6.7. l) Adoption of the BT.2020 standard for color gamut coverage, with upgraded technical indicators, see 5.6.9.
m) Upgraded indicators for brightness uniformity, see 5.6.4.
n) Enhanced and categorized grayscale level indicators in electrical requirements, see 5.7.1.
o) Revised climate and environmental adaptability requirements, including working environment requirements (see 5.10.1), working temperature environment adaptability (see 5.10.2).
p) Removal of collision requirements from mechanical adaptability.
q) Revision of power supply adaptability requirements.
r) Removal of original methods for structural assembly precision testing, replaced with the method specified in SJ/T 11281—2017, section 5.1.2.
s) Improvement of Mini LED adhesion testing methods.
t) Addition of visual health testing methods.
u) Refinement of maximum brightness testing methods, including the addition of brightness calculation methods (see Appendix A).
v) Addition of color gamut visibility angle testing methods.
w) Color gamut coverage testing methods adapted to BT.2020 standard requirements.
x) Revision of power efficiency and power factor testing standards; refinement of energy consumption rating testing methods.
y) Revision of climate and environmental adaptability testing methods.
z) The inspection rules have been revised, the type test requirements have been deleted, the content has been revised mainly in terms of the quality consistency of product delivery/delivery, the test items and sequence have been added, and the sampling and batch rules and judgment rules have been added, see Chapter 7.
Please note that some aspects of this document may involve patents. The issuing authority of this document is not responsible for the identification of patents. This document is put forward and centralized by Shenzhen Lighting and Display Engineering Industry Association.
The main drafting units of this document are: Shenzhen Aotuo Electronics Co., LTD., TCL Huaxing Optoelectronics Technology Co., LTD., Shenzhen Lighting and Display Engineering Industry Association, Shenzhen Abison Optoelectronics Co., LTD., Huizhou Jufei Optoelectronics Co., LTD
Participants in the drafting of this document: Shenzhen Juneng Weiye Technology Co., LTD., Shenzhen Leiman Optoelectronics Technology Co., LTD., Xiamen Qiangjun Optoelectronics Technology Co., LTD., Shenzhen Jingtai Co., LTD., Huacan Optoelectronics (Zhejiang) Co., LTD., Hunan Xinyaseng Optoelectronics Co., LTD., Shenzhen Zhouming Technology Co., LTD., Ji ‘an Mullinsen Optoelectronics Display Co., LTD., Qingdao Hisense Electric Co., LTD Co., LTD., Shenzhen Skyworth -RGB Electronics Co., LTD., Shenzhen Kangjia One vision Commercial Display Co., LTD., Xiamen Vision Technology Co., LTD., Suzhou Riyuecheng Technology Co., LTD., Shenzhen Shangwei Weiye Co., LTD., Foshan Guoxingguang Electric Co., LTD., Shenzhen Opte Industrial Materials Co., LTD., Shenzhen Huateng Semiconductor Equipment Co., LTD., Dongguan Al Tai Display Technology Co., LTD., Shende Color Optoelectronics (Shenzhen) Co., LTD., Shenzhen Rejing Optoelectronics Technology Co., LTD., Shenzhen Ruifeng Optoelectronics Co., LTD., Shenzhen Guangxiang Technology Co., LTD., Shenzhen Weiqiaoshun Optoelectronics Co., LTD., Shenzhen Chuangxian Optoelectronics Co., LTD., Shenzhen Laiford Technology Co., LTD., Shenzhen Helilai Technology Co., LTD., Shenzhen Manke Zhisheng Technology Co., LTD., OSram Optoelectronics Semiconductor (China) Co., LTD., Shenzhen Leiling Display Technology Co., LTD., Shanghai Samsung Semiconductor Co., LTD., Shanghai Kerui Optoelectronics Development Co., LTD., Shenzhen Chaosun Technology Co., LTD., Shenzhen Chenri Technology Co., LTD., Guangzhou Wenxin Exhibition Service Co., LTD., Nanchang University, China Semiconductor Lighting /LED Industry and Application Alliance, China Institute of Standardization, China Advertising Association Outdoor Advertising Branch, Sun Yat-sen University, Guangdong Institute of Product Quality Supervision and Inspection, Beijing University of Technology, TCL Semiconductor Light Source Research Institute, Shenzhen University of Technology, Shenzhen University, Tsinghua University, Shenzhen Graduate School, Southern University of Science and Technology, Shenzhen Institute of Standards and Technology, Sinochrome Yingtai Testing Technology Co., LTD Department, Shenzhen Baoan District new display industry technology promotion center
The main drafters of this document: Wu Zhenzhi, Huang Weidong, Jing Fajun, Shi Changjin, Xie Meng, Shen Tigang, Tu Menglong, Zhao Fei, Zeng Xiaolan, Wang Yong, Jin Chongxing, Zhu Weiping, Gong Haoran, Wang Jiangbo, Liang Zhan, Zhang Jingang, Zhou Zong, Shen Sikuan, Liang Enzhi, Hu Hongchao, Zhao Yichen, Li Shaoyang, Qin Kuai, Liu Qin, Liu Jun, Liang Wenji, Xu Chenai, Qi Yangyang, Zhang Yongjun, Hu Zhijun, Zhou Youwen, Cheng Zhuo, Qiu Fu Quan, Xiang Yanwang, Zhang Sheng, Shao Jiaping, Jiang Xinping, Xuan Jiongshuo, Zhong Zhenyu, Deng Zhaoxu, Qian Xuexhang, Zhang Dan, Zhao Lihong, Zou Weilong, Zhu Hong, Liu Keliang, Bai Yingjie, Yan Zhenhang, Wang Liqiang.
The previous editions of this document and its substitutes:
— The first edition in 2020 is T/SLDA 01-20, the first revision in 2022, and the standard number is T/SLDA 001-2022;
— This is the first revision
1 Scope
This document specifies the terms and definitions, classification, technical requirements, test methods, and inspection rules for Mini LED commercial displays, as well as marking, packaging, transportation, and storage requirements.
This document is intended for commercial displays using Mini LEDs.
2 Normative References
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Where a reference file with a date is noted, only the version corresponding to that date applies to this file; Undated references, the latest version of which (including all change orders) apply to this document.
GB/T 2423.17-2008 Environmental testing for electric and electronic products Part 2: Test methods Test Ka: Salt spray (IEC 60082-2-11:1981, IDT)
GB/T 2828.1—2012 Sampling inspection procedures for attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL)
(ISO 2859-1:1999, IDT)
GB/T 2829—2002 Sampling procedures and tables for periodic inspections (applicable to inspections of process stability) GB 4208-2017 Degrees of protection provided by enclosures (IP code) (IEC 60529:2013, IDT)
GB/T 4214.1-2017 General requirements for noise test methods for household and similar electrical appliances
GB 4943.1—2011 Information Technology Equipment Safety Part 1: General requirements (IEC 60950-1:2005, MOD)
GB/T 9254.1—2021 Information technology equipment, multimedia equipment and receivers Electromagnetic compatibility Part 1: Emission requirements (CISPR 32:2015, Electromagnetic compatibility of multimedia equipment—Emission requirement, MOD)
GB/T 14436-1993 Industrial product assurance documents General
GB/T 14714-2008 General specification for switching power supplies for microcomputer system equipment GB/T 17618-2015 Information technology equipment immunity limits and measurement methods
GB 17625.1-2012 Electromagnetic compatibility Limits Harmonic current emission limits (equipment input current per phase ≤16A)
GB/T 20145-2006 Photobiological safety of lamps and lamp systems
GB 20943-2013 Energy efficiency limit values and energy saving of single-channel output AC-DC and AC-AC external power supplies
GB/T 27050.1-2006 Conformity assessment Supplier’s declaration of conformity Part 1: General requirements GB/T 27050.2-2006 Conformity assessment Supplier’s declaration of conformity Part 2: Supporting documents SJ/T 11141-2017 General specification for light-emitting diode (LED) display screens
SJ/T 11281-2017 Test methods for light-emitting diode (LED) display screens
SJ/T 11363-2016 Limit requirements for toxic and hazardous substances in electronic information products
3 Terms and Definitions
SJ/T 11141-2017, SJ/T 11281-2017, and the following terms and definitions apply to this document.
3.1 Mini LED
LED devices with chip sizes between 50-200μm.
3.2 Mini LED display module
A unit consisting of a Mini LED pixel array and a drive circuit with a pixel center spacing of 0.3-1.5mm.
3.3 Mini LED display assembly
An independent unit consisting of several Mini LED display modules, control circuits, power converters, and corresponding structural parts.
3.4 Mini LED screen
The screen is composed of several Mini LED display modules of the same specifications, which can be controlled by the display control system to complete the screen display.
3.5 Mini LED display
The device that displays text, images, videos, and other information with Mini LED pixels usually includes basic components such as a Mini LED screen and display control system, and may also include auxiliary systems, etc., and can adopt an integrated or split structure.
3.6 Mini LED adhesion force
The anti-collision ability of Mini LED attached to the screen is expressed by the thrust of Mini LED.
3.7 Dark color uniformity
The color consistency of all structural materials on the surface of the screen in the black screen state.
3.8 Mini LED display luminance view angle
When the brightness in the viewing direction drops to one-third of the brightness in the normal direction of the display, the sum of the angles between the two viewing directions in the same plane and the normal direction includes horizontal brightness view angle and vertical brightness view angle.
3.9 Positive chip display
Mini LED display whose pixels are composed of vertical red LED chips and positive blue-green LED chips.
3.10 Multiple chip display
Mini LED display whose pixels are composed of vertical red LED chips and flip-chip blue-green LED chips.
3.11 Flip chip display
Mini LED display whose pixels are composed of flip-chip red, blue, and green LED chips.
3.12 Mini LED commercial display
Mini LED display that can be used for graphics and video playback in commercial trade, advertising, etc., and has a smaller pixel pitch, high definition, high reliability, high interface compatibility, and is easy to install and maintain.
4 Classification of Display Screens
4.1 Classification by Chip Structure
LED light-emitting chips can be divided into upright, vertical, and flip-down structures according to chip structure, and Mini LED display screens can be divided into upright display screens, mixed display screens, and flip-down display screens according to chip structure combinations.
4.2 Classification by Package Bracket
The package bracket, it can be divided into bracket-type single-device package lamp-driver separation technology and bracket-free integrated package lamp-driver integration technology.
4.3 Classification by Maintenance Method
According to different maintenance methods, Mini LED display screens can be divided into front maintenance display screens (or front maintenance display screens), rear maintenance display screens (or back maintenance display screens), and front and rear maintenance display screens.
4.4 Classification by Display Dimension
According to different display dimensions, Mini LED display screens can be divided into 2D display screens, 3D display screens, and display screens compatible with 2D and 3D.
4.5 Classification by Screen Shape
According to different screen shapes, Mini LED display screens can be divided into flat display screens, curved display screens and flexible display screens.
5 Technical Requirements
5.1 General Provisions
In this document, the range of technical indicators of Mini LED commercial display is divided into grades, respectively, level A, level B and level C, and the technical indicators of level A are the highest, followed by level B and level C are the lowest.
5.2 Appearance
5.2.1 Basic Requirements
The appearance of the Mini LED commercial display after assembly meets the following requirements:
a)The appearance should be clean, with no scratches, the surface of the Mini LED is not damaged, fall off, etc.;
b) Metal parts should not rust and mechanical damage
5.2.2 Ink Consistency
No color blocks, color spots, or ink consistency requirements should meet the requirements of Table 1, ∆ECIELab evaluation grade division is shown in Table 2.
A | B | C |
∆ECIE <0.5 | 0.5≤∆ECIE <1 | 1≤∆ECIE<1.5 |
∆ECIELab | Perceptual Cognition |
0~0.5(not included) | Can be ignored, difficult to identify with the naked eye |
0.5(inclusive)~1(not included) | Very low, only people with long-term professional training can barely detect |
1(inclusive)~1.5(not included) | Medium, sometimes visible to the naked eye |
≥1.5 | Serious, very obvious |
Note: For the black screen color difference of the display, when the color difference of different batches exceeds the specified value, they cannot be mixed. |
5.2.3 Markings
Meet the following requirements:
a) Product identification should be correct, clear, upright, firm, and the indication should be correct;
b) The protective grounding terminal should be marked, and there should be warning signs at the fuse and switch power supply
5.3 Structure
5.3.1 Basic Requirements
The structure of the Mini LED commercial display screen after assembly meets the following requirements:
a) The operating buttons should be flexible and reliable, and the parts should be tightened without looseness;
b) There should be no obvious assembly gaps at the joints of the product;
c) The display screen structure should meet the requirements of electrical safety, EMC, and easy maintenance;
d) The display screen structure should have a heat dissipation structure and heat dissipation measures;
e) The structural process should be conducive to the installation and maintenance of the screen body, and the maintenance process of the screen body structure should not destroy the consistency of the surface ink color;
f) The internal wiring of the display screen should be simple and smooth;
g) The structural materials of the display screen should ensure the safety and firmness of the structure;
h) The display screen should pass the national or local mandatory certification requirements.
5.3.2 Structure Size
Meet the following requirements:
a) The display screen’s dimensions, effective luminous area, installation/assembly dimensions, etc. should comply with the requirements advertised by the manufacturer or product provider, such as the product specification sheet;
b) Mini LED display modules should be designed with aspect ratios such as “1:1”, “2:1”, “16:9”, “8:9”, “20:9”, etc.
5.3.3 Mini LED Adhesion Force
Check the anti-collision ability of the Mini LED display module, and the adhesion of the Mini LED should meet the requirements of Table 3.
Pixel Center Pacing/mm | Adhesion Force/N |
0.8<P≤1.5 | N≥30 |
0.3≤P≤0.8 | N≥20 |
Note: Displays packaged with COB are not suitable for the requirements of this clause, subject to the specifications advertised by the manufacturer or product provider.
5.3.4 Structure Assembly Accuracy
The structural assembly accuracy of the Mini LED commercial display shall meet the requirements of Table 4.
No. | Basic Parameter | Unit | Technical Requirements | |||
A | B | C | ||||
1 | The flatness of Plane S | mm/m | S≤0.2 | 0.2<S≤0.3 | 0.3<S≤0.4 | |
2 | Relative Deviation of Pixel Center Spacing JX | — | JX≤3% | 3%<JX≤5% | 5%<JX≤7% | |
3 | Horizontal Relative Dislocation Ch | Pixel Center Spacing 0.8 mm~1.5mm | mm | Ch≤0.12 | 0.12<Ch≤0.2 | 0.2<Ch≤0.35 |
Pixel Center Spacing 0.3 mm~0.8mm | Ch≤0.1 | 0.1<Ch≤0.15 | 0.15<Ch≤0.25 | |||
4 | Vertical Relative Dislocation Cv | Pixel Center Spacing 0.8 mm~1.5mm | mm | Cv≤0.12 | 0.12<Cv≤0.2 | 0.2<Cv≤0.35 |
Pixel Center Spacing 0.3 mm~0.8mm | Cv≤0.1 | 0.1<Cv≤0.15 | 0.15<Cv≤0.25 |
5.3.5 Resource and Environmental Protection
The various materials and components used in the display screen should comply with the relevant requirements of SJ/T 11363-2016 and meet the following requirements:
a) Environmentally friendly materials should be given priority for packaging and cushioning materials, especially materials with recyclable characteristics, to reduce the use of disposable packaging materials;
b) According to the needs of the application scenario, relevant declarations of compliance with environmental protection requirements should also be provided, and the declarations should comply with the relevant requirements of GB/T 27050.1-2006 and GB/T 27050.2-2006.
5.4 Basic Function
The basic functions of the Mini LED commercial display screen after assembly meet the following requirements:
a) The basic function configuration requirements are shown in Table 5. All functions should operate normally, including communication, display parameter settings, brightness settings, etc., which should comply with the product manufacturer’s product standards or product manuals;
b) The display screen power supply should work normally.
No. | Function | Condition | Technical Requirements |
1 | Operating System Compatibility | Windows / Hongmeng HarmonyOS / winning Kirin Linux / Hongqi Linux / UOS system / Linux / android / IOS | Comply with the product standards of the product manufacturer |
No. | Function | Condition | Technical Requirements |
2 | Module a (box) Parameter Settings | Necessary | Comply with the product standards of the product manufacturer |
3 | Connection mode b Set | Necessary | Comply with the product standards of the product manufacturer |
4 | Gamma set up | Necessary | Comply with the product standards of the product manufacturer |
5 | Frame rate setting | Necessary | Comply with the product standards of the product manufacturer |
6 | Operational status monitoring | Necessary | Comply with the product standards of the product manufacturer |
7 | Intensity Control | Necessary | Comply with the product standards of the product manufacturer |
8 | color temperature adjusting | Necessary | Comply with the product standards of the product manufacturer |
9 | contrast control | Necessary | Comply with the product standards of the product manufacturer |
10 | saturation control | Optional | Comply with the product standards of the product manufacturer |
11 | Large-screen information query | Necessary | Comply with the product standards of the product manufacturer |
12 | Communication interface monitoring | Necessary | Comply with the product standards of the product manufacturer |
13 | test pattern | Optional | Comply with the product standards of the product manufacturer |
a. Module: One of the main components of the finished LED display screen, mainly composed of LED chips, PCB circuit boards, driver ICs, resistors, capacitors, and plastic kits, commonly known as cabinets. b. Connection method: The module has a variety of physical connection methods and can be connected arbitrarily. The display screen has the function of setting any connection method of the module, and its system diagram is consistent with the actual physical connection method to ensure the normal information/data transmission/communication between modules. c. Operation status monitoring: The display screen is equipped with cabinet working status monitoring software, which has the function of monitoring the working status of each cabinet at any time, including the power supply, temperature, fire protection, remote data transmission, and other operating status of the display screen. d. Large screen information query: The display screen has the function of querying its own specification parameters and current status information, including LED module optical parameters (brightness, color temperature, contrast, saturation, etc.), Gamma, frame rate, operating temperature, life cycle status, operating system, and software version, etc. e. Communication interface monitoring: The display screen has the function of monitoring the communication status of various external physical communication interfaces. |
5.5 Interface Requirements
5.5.1 Physical Interface
The interfaces supported by the Mini LED commercial display are shown in Table 6.
No. | Port | Condition | Technical Requirements | |
1 | Video Input | DVI/ SDI/ DP/ HDMI | Mandatory. At least one type is supported | Comply with the product standards of the product manufacturer |
2 | Video Output | Gigabit / 10 Gigabit Networks | Mandatory. At least one type is supported | RJ45 ports are available for gigabit networks, and optical fiber ports are available for 10-gigabit networks |
DVI/ SDI/ DP/ HDMI | Optional | |||
3 | Control Signal | Serial Port (USB/DB9) Ethernet Interface | Mandatory. At least one type is supported | Supports one or more interfaces such as RS232, RS485, or Ethernet |
4 | Genlock, 3D and more | Optional | ||
5 | Power Source | Type 1:220VAC to 240VAC, 50/60Hz Type 2:100VAC, 110VAC to 130VAC,50/60Hz | Mandatory. At least one type is supported | Comply with the product standards of the product manufacturer |
5.5.2 Interchangeability Requirements
The display module and display module of Mini LED commercial display should be interchangeable.
Note: Ensure the flexibility of display in production testing, on-site installation, maintenance, spare parts supply, and other links.
5.5.3 Compatibility Requirements
Mini LED commercial display should have the following compatibility requirements:
a) from the safety, electromagnetic compatibility, reliability, easy maintenance, ease of use, environmental adaptability, energy-saving design, environmental protection, and other aspects
Fully consider the compatibility of the display design;
b) The software design of the display screen should be based on the premise of meeting the functional requirements, and the upgrade of the software version or configuration software should be backward compatible.
5.6 Safety Requirements
5.6.1 Electric Safety
The safety performance of the Mini LED commercial display meets the following requirements:
a) It should meet the relevant requirements of GB 4943.1;
Grounding, safety marking, floor drain current, electrical strength, temperature rise, etc. shall also meet the requirements of 5.7 in SJ/T 11141-2017;
c) The switching power supply of the Mini LED display should have undervoltage protection, output overvoltage protection, overcurrent protection, short-circuit protection, overheating protection, and other functions.
5.6.2 Vision Health
The visual health requirements of the Mini LED display screen are shown in Table 7.
No. | Basic Parameter | Unit | Technical Requirements | ||
A | B | C | |||
1 | Blue Radiation Energy | W/sr | ≤5×10-3 | ≤10×10-3 | ≤20×10-3 |
2 | Automatic Brightness Control | — | Adaptive Brightness Adjustment Function | Time-Sharing Brightness Adjustment Function | |
3 | Illuminance | lx | ≤500 | ≤600 | ≤800 |
5.7 Optical Property
5.7.1 High-Light Brightness
The average maximum brightness of the full-screen white field of the Mini LED commercial display and display module (indoor) is represented by L, which should meet the requirements of Table 8.
Pixel Center Spacing P(mm) | A | B | C |
0.8<P≤1.5 | L≥600 | 600>L≥500 | 500>L≥400 |
0.3≤P≤0.8 | L≥500 | 500>L≥400 | 400>L≥300 |
5.7.2 Luminance Angle
The classification of the brightness Angle of the Mini LED commercial display and display module is shown in Table 9.
Brightness Angle | A | B | C |
Horizontal brightness viewing Angle qh | qh ≥170 | 170>qh ≥160 | 160>qh ≥140 |
Vertical brightness Angle qn | qn ≥170 | 170>qn ≥160 | 160>qn ≥140 |
5.7.3 Chroma Can Be Viewed
The chromaticity of the Mini LED commercial display and display module can be divided into viewing Angle levels as shown in Table 10.
Note: This indicator applies to the display in applicable scenarios.
Colorimetric Viewing Angle | A | B | C |
Horizontal luminance Angle qh | qh ≥160 | 160>qh ≥140 | 140>qh ≥120 |
Horizontal luminance Angle qn | qn ≥160 | 160>qn ≥140 | 140>qn ≥110 |
5.7.4 Uniformity of Luminance
The brightness uniformity IJ classification of Mini LED commercial display and display module is shown in Table 11.
Note: Luminance heterogeneity =1- IJ
A | B | C |
IJ >98.5% | 98.5%> IJ ≥97% | 97%> IJ ≥95% |
5.7.5 Color Coordinate Error
The grade division of white field color coordinate errors ∆x and ∆y of Mini LED commercial display and display module is shown in Table 12.
A | B | C |
∆x≤0.003 | 0.003<∆x≤0.006 | 0.006<∆x≤0.01 |
∆y≤0.003 | 0.003<∆y≤0.006 | 0.006<∆y≤0.01 |
5.7.6 Primary Wavelength Error
A | B | C |
∆𝜆𝐷≤5 | 5<∆𝜆𝐷≤7 | 7<∆𝜆𝐷≤9 |
5.7.7 Standard Color Temperature Coordinates
The standard color temperature coordinates of the black body curve of the Mini LED commercial display and display module shall comply with the requirements of Table 14.
Color Temperature Coordinate | 2800K | 3200K | 4500K | 5000K | 5600K | 6500K | 8000K | 9300K |
X | 0.452 | 0.424 | 0.361 | 0.346 | 0.329 | 0.3127 | 0.295 | 0.284 |
Y | 0.411 | 0.400 | 0.364 | 0.354 | 0.340 | 0.3290 | 0.305 | 0.294 |
Note: The error of 6500K file is -0/+200K, other color temperature file is ±100K.
5.7.8 Maximum Contrast
Under the ambient illumination of 10±10% lx, the classification of the highest contrast is shown in Table 15.
A | B | C |
C≥5000:1 | 5000:1>C≥3000:1 | 3000:1>C≥1000:1 |
5.7.9 Gamut Coverage
The color gamut coverage of Mini LED commercial display (BT.2020) is classified in Table 16.
A | B | C |
Gp>75% | 75%≥Gp>60% | Gp≤60& |
5.8 Electrical Requirement
5.8.1 Gray Scale
Mini LED commercial display should support 8bit-16bit gray level requirements, level division is shown in Table 17.
A | B | C |
14 (inclusive) or more | 8 (inclusive) ~ 14 (exclusive) | 8 (not included) below |
5.8.2 Repetition Frequency
The classification of frame change frequency of Mini LED commercial display is shown in Table 18.
A | B | C |
𝑓𝐻 ≥120 | 120>𝑓𝐻 ≥60 | 𝑓𝐻 <60 |
5.8.3 Refresh Rate
A | B | C |
𝑓𝑐 ≥3840 | 3840>𝑓𝑐 ≥1920 | 1920>𝑓𝑐 ≥1000 |
5.9 Pixel Runaway Rate
A | B | C |
𝑃𝑍=0 | 0≤𝑃𝑍<1 | 1≤𝑃𝑍<3 |
A | B | C |
𝑃𝑍≤3 | 3≤𝑃𝑍<5 | 5≤𝑃𝑍<10 |
5.10 Energy Saving Requirements
5.10.1 Power Supply Average Efficiency and Power Factor
At room temperature, the power factor and power conversion efficiency of the Mini LED commercial display power supply should meet the requirements of Table 22 and Table 23, respectively, the power factor is expressed by PF, and the conversion efficiency is expressed by η.
A | B |
PF≥0.95 | 0.95>PF≥0.90 |
A | B | C |
η>90% | 90%>η≥85% | 85%>η≥80% |
5.10.2 Energy Consumption Grade
Mini LED commercial display under 300 cd/m2, the energy consumption level E per unit display area should meet the requirements of Table 24.
A | B | C |
E≤300 | 300<E≤450 | 450<E≤600 |
5.11 Climate Adaptability
5.11.1 Working Environment Requirement
When the Mini LED commercial display is intended to be used in different environmental conditions such as below 2000m (including 2000m), 2000m to 5000m (including 5000m) and above 5000m, as well as non-tropical climate conditions and tropical climate conditions, it should meet the relevant requirements in GB 4943.1-2011; Corresponding safety warning signs should be set up in obvious locations.
5.11.2 Adaptability to Operating Temperature Environment
The operating temperature environment adaptability of the Mini LED commercial display or display module should meet the requirements of Table 25, and should work normally after weathering various climatic environment tests and tests.
Test Item | Test Parameters | Indoor | Outdoor Mounted Display Screen | Demand | |
Ⅰ | Ⅱ | Ⅲ | |||
High Temperature Test (Working State) | Temperature | 40℃±2℃ | 55℃±2℃ | 70℃±2℃ | The display should work normally during and after the test. |
Time of Duration | 8h | 8h | 8h | ||
Low Temperature Test (Working State) | Temperature | -10℃±2℃ | -25℃±2℃ | -40℃±2℃ | |
Time of Duration | 8h | 8h | 8h |
5.11.3 Moist Heat
Humid heat load: Under the conditions of the highest working ambient temperature and relative humidity RH (93±3) %, the power should work normally for 8h; Constant humid heat: In an environment where the ambient temperature is (40±2) ℃ and the relative humidity is RH (93±3) %, it should be able to work normally within 48 hours.
5.11.4 Salt Fog
Mini LED commercial display screens are exposed to salt spray (sodium chloride) environments as shown in Table 26. The following conditions should not exist inside and outside the equipment:
—After the test, there should be no obvious rust, the protective layer on the outer surface of the shell should not be soft, blistering, or wrinkled, and there should be no corrosion of the metal matrix (except for welds and mechanical damage);
—After the test, the coating should not generally have bubbles with a diameter greater than 1mm, and the maximum diameter of a single bubble should not exceed 5mm.
Project Name | Rated Value | Test Duration |
Salt Fog Test | 15℃ ~ 35℃; The salt solution concentration was (5±0.1) %; The pH value of the salt spray before atomization is between 6.5 and 7.2. | 168h |
Note: Completely exposed to outdoor environmental conditions, subjected to atmospheric pressure, humidity, temperature, sun, wind, rain and other effects, in this case, salt spray resistance in the north of China cold areas, desert areas are not required. |
5.12 Mechanical Environment Adaptability
5.12.1 Enclosure Protection Class
The case protection level of the Mini LED commercial display is shown in Table 27, and the protection level should meet the relevant requirements in GB 4208-2017.
Application Environment | A | B | C |
Indoor | F≥IP31 | IP31>F≥IP30 | IP30>F≥IP20 |
Outdoor | F≥IP65 | IP65>F≥IP54 | IP54>F |
5.12.2 Vibration
Shall comply with the requirements of 5.15.7 in SJ/T 11141-2017;
5.12.3 Transportation
It shall comply with the requirements of 5.15.8 in SJ/T 11141-2017.
5.13 Power Supply Adaptability
Mini LED commercial display given power supply adaptability indicators, unless there are special provisions, by AC power supply (AC) power supply voltage fluctuation range within the rated value of 220VAC (frequency 48 ~ 52Hz) should be able to work normally; For wide voltage Mini LED commercial display products, the equipment power supply voltage fluctuation range of 90 ~ 264VAC (frequency 48 ~ 52Hz) should be able to work normally.
5.14 Electromagnetic Compatibility
The radio disturbance and immunity shall meet the requirements of 5.17 in SJ/T 11141-2017.
5.14.1 Radio Disturbance
The radio disturbance limit of the Mini LED commercial display module shall comply with the relevant requirements of GB/T 9254.1-2021, and the radio disturbance level of the display module is shown in Table 28.
A | B |
CLASS B | CLASS A |
5.14.2 Harmonic Current
The harmonic current of Mini LED commercial display and display module should meet the relevant requirements of GB 17625.1-2012.
5.14.3 Noise Immunity
The immunity limit of Mini LED commercial display and display module shall meet the relevant requirements of GB/T 17618-2015, as shown in Table 29.
Test Item | Test Specification | Unit | Test Result Judgment |
Electrostatic Discharge (ESD) | 4 (Contact Discharge) | kV | B |
8 (Air Discharge) | kV | ||
Amplitude Modulation of Radio Frequency Electromagnetic Fields | 80~1000 | MHz | A |
3 | V/m(unmodulated) | ||
80 | %AM(1kHz) | ||
Electrical Fast Transient Pulse Clusters (Signal ports and telecommunication ports) | 0.5 5/50 5 | kV(peak) Tr/Th ns kHz(repetition rate) | B |
Electrical fast transient pulse group | 0.5 5/50 5 | kV(peak) Tr/Th ns kHz(repetition rate) | B |
Test Item | Test Specification | Unit | Test Result Judgment |
Electric Fast Transient Pulse Group (Ac Power Input Port) | 1 5/50 5 | kV(peak) Tr/Th ns kHz (repetition rate) | B |
Surge (Ac Input Port) | 1.2/50(8/20) 1 2 | Tr/Th μs kV(peak) kV(peak) | B |
Surge (Dc Power Input Port) | 1.2/50(8/20) 0.5 | Tr/Th μs kV(peak) | B |
Surge (Signal Port And Telecommunication Port) | 1 (without protector) 10/700 | kV(peak) Tr/Th μs | C |
4 (with protector) 10/700 | kV(peak) Tr/Th μs | ||
Rf Continuous Wave Conduction | 0.15~80 3 80 | MHz V(unmodulated) %AM(1kHz) | A |
Power Frequency Magnetic Field | 50 1 | Hz A/m(root mean square) | A |
Voltage Dip | >95 0.5 | %drop cycle | B |
Voltage Dip | 30 25 | %drop cycle | C |
Short Voltage Interruption | >95 250 | %drop cycle | C |
Test result judgment description: A: Functioning properly within the limits specified by the manufacturer, client or purchaser; B: Temporary loss or reduction of function or performance, but self-recovery after the disturbance ceases without operator intervention; C: Temporary loss or reduction in function or performance that requires operator intervention to restore. |
5.15 Noise
The system noise of the display module composed of the LED display should not be greater than 30dB(A).
5.16 Mean Working Time Between Failures
The average working time MTBF of the display screen should not be less than 10000h.
6 Test Methods
6.1 Standard Conditions
6.1.1 Atmospheric Conditions
Unless otherwise specified, the test conditions are as follows:
a)Ambient temperature: 15 ℃ ~ 35 ℃;
b) Relative humidity: 20%RH ~ 80%RH;
c) Atmospheric pressure: 86kPa ~ 106kPa.
6.1.2 Standard Atmospheric Conditions for Arbitration Tests
Unless otherwise specified, the standard atmospheric conditions for arbitration tests are as follows:
a) Ambient temperature: 25 ° C ±1 ° C;
b) Relative humidity: 48%RH ~ 52%RH;
c) Atmospheric pressure: 86kPa ~ 106kPa.
6.1.3 Other Environmental Conditions
Unless otherwise specified, other environmental conditions shall meet the following requirements:
a) AC power supply: 220× (1±10%) VAC, 50Hz±1Hz;
b) Computer: shall meet the computer configuration requirements declared by the manufacturer or provider;
c) The test environment shall be free of mechanical vibration, electromagnetic and photoelectric interference or damage factors that affect the test accuracy;
d) Before testing, the basic functions of the display screen shall be debugged to normal status, and the configuration parameters and working status of the display screen shall not be changed during the test;
e) Before the photoelectric performance test of the display screen, all light-emitting diodes (LEDs) shall be lit at 30% of the maximum brightness, and the preheating time shall not be less than 15 minutes.
6.2 Test Instruments and Software
Unless otherwise specified, the performance of all the following test instruments and meters shall meet the specific test requirements:
a) Color analyzer (similar instruments used to measure optical properties such as brightness and chromaticity);
b) Oscilloscope: bandwidth not less than DC~100MHz;
c) Vernier caliper: graduation value 0.02mm;
d) Plug gauge: graduation value 0.01mm;
e) Power meter;
f) Push-pull force meter;
g) Colorimeter;
h) Test software shall meet the actual measurement requirements;
i) Other required test instruments and meters shall comply with the requirements of 4.2 in SJ/T 11281-2017.
Note: The measuring equipment is within the calibration period and the measurement is carried out in accordance with the relevant operating specifications.
6.3 Appearance
6.3.1 Appearance Inspection
Visual and touch methods are used to detect the appearance quality and display quality of the display screen to determine whether the results meet the requirements of 5.2.1.
6.3.2 Ink Consistency
Visual and touch methods are used to detect the appearance quality and display quality of the display screen to determine whether the results meet the requirements of 5.2.1.The display screen (display module) tests the ink consistency under specified conditions. The test method is as follows:
a) Place the display screen in a stable lighting environment, and the test screen is a full black screen;
b) Adjust the display to the working state;
c) Using the D65 light source as the reference light source, the tristimulus values Xn, Yn, and Zn were tested as the reference color coordinate values;
d) The display is in the off state, under the state of D65 light source (8 degrees of illumination), test and record the CIE 1931 brightness and chromaticity value (CIExyz) in the center of each module of the display;
Note: 8-degree irradiation refers to the diffuse reflection measurement of the D65 light source using the method of 8 degrees Angle irradiation 90 degrees Angle reception (or 90 degrees Angle irradiation 8 degrees Angle reception).
e) According to formula (1) ~ (4), convert the test data into CIELAB values, including brightness coordinate L* and chromaticity coordinate a, and b;
Note: In the actual test, L, a, and b* values can be tested by the colorimeter; When testing the display with the middle pixel spacing of 0.8mm to 1.5mm, it is recommended to repeat the test (for example, 5 times) when using the colorimeter to test the values of L, a, and b* to ensure the accuracy of the values.
f) Calculate the CIELAB color difference between 8 adjacent modules (horizontal, vertical, oblique) according to formula (5), and find the maximum value;
∆L∗, ∆𝑎∗, ∆𝑏∗ are the difference between the coordinates of 𝐿∗, 𝑎∗ and 𝑏∗ for the two color samples:
g) Record 𝐿∗, 𝑎∗ and 𝑏∗at the center point of each module of the display screen, calculate the color difference∆E𝐶LE and the maximum color difference ∆E𝑚ax, calculated by all adjacent modules, and determine that the results are in line with the corresponding grade according to Table 3.
6.3.3 Markings
The content of the mark is checked by visual method, and the equipment mark is tested by hand touch method and swab method. The swab method is to wipe the marking label of the equipment with a wine-soaked cotton ball for 15s to determine whether the result meets the requirements in 5.2.3.
6.4 Structure
6.4.1 Structural Basic Requirements Check
Check and test the equipment structure according to the following methods:
a) Use visual method, touch method, manual method, etc. to check the operation buttons, splicing, heat dissipation structure, internal wiring, materials, structural process, etc. of the display screen. If necessary, use the corresponding standard measurement tools to detect the structural firmness;
b) Check whether the display screen and display module have national or local mandatory certification certificates or test reports.
Determine whether the results meet the requirements of 5.3.1.
6.4.2 Structure Size
Measure the dimensions of the equipment with standard measuring tools and determine whether the results meet the requirements of 5.3.2.
6.4.3 Mini LED Adhesive Force
Mini LED adhesion technical specifications for an integrated package of Mini LED, according to the size of the Mini LED spacing classification, the test method is as follows:
a) Prepare at least 10pcs of samples;
b) The push tension meter and the PCB board to form an Angle of less than 5°;
c) Apply the thrust N from the wider side of the LED, the 8-pin Mini LED can apply the thrust in any direction, and the LED with uneven pin distribution can choose the direction of the weakest LED pad to apply the thrust;
d) When the LED is pushed down, record the reading on the thrust meter;
e) Test the thrust of 10pcs Mini LED 𝑁1 ~ 𝑁10, and calculate the mean of push effort N according to formula (6):
N: Mini LED adhesive force.
f) According to the test Mini LED adhesion N, compare the requirements of Table 3 in 5.3, and include the corresponding grades;
g) The COB package is not tested, and the technical indicators advertised by the manufacturer or product provider shall prevail. After the test is completed, determine whether the results meet the requirements of 5.3.3 and incorporate them into the corresponding level.
6.4.4 Structure Assembly Accuracy
The assembly accuracy of the LED display was measured with a general measuring tool with an accuracy of 0.01mm.
Plane flatness, relative deviation of pixel center distance, horizontal relative dislocation, and vertical relative dislocation are tested according to SJ/T 11281 — 2017
The method specified in 5.1.2 is tested.
Determine whether the results meet the requirements in 5.3.4 and incorporate them into the corresponding grades.
6.4.5 Resources and Environmental Protection
The Mini LED commercial display manufacturer or product provider shall provide the corresponding specifications, certification certificates or test reports of various materials and components used in the display screen, as well as the related statements on product resources and environmental protection, to determine whether the results meet the requirements in 5.3.5.
6.5 Basic Functions
According to the product manuals provided by Mini LED commercial display manufacturers or suppliers, perform each function as specified in Section 5.4 to determine whether the results meet the requirements outlined in Section 5.3.
6.6 Interfaces
Inspect the Mini LED commercial display samples provided by manufacturers or suppliers. Check all physical interfaces, interchangeability, and compatibility designs as specified in Section 5.5 to determine whether the results meet the requirements of Section 5.4.
6.7 Safety Requirements
6.7.1 Electrical Safety
Test the electrical safety of the Mini LED commercial display according to the methods specified in Section 6.8 of SJ/T 11141-2017. After completing the tests, determine whether the results meet the requirements of Section 5.6.1.
6.7.2 Visual Health
Test the visual health of the display during playback using the following methods:
a) Use a full white field signal and a full blue field signal to measure the blue light radiation energy at the center point of the display. Discard the maximum measurement value.
b) Verify if the display is equipped with a temporal brightness adjustment function and an adaptive brightness adjustment function.
c) Use a lux meter to measure the illuminance value of the display with a full white field signal.
After completing the tests, determine whether the results meet the requirements of Section 5.6.2 and classify them into the appropriate grade.
6.8 Optical Characteristics
6.8.1 Maximum Brightness
The test conditions are as follows:
a) Ambient illuminance should vary within ±10% without the presence of noticeable colored light sources.
b) A color analyzer should be placed at a distance of 2 meters perpendicular to the Mini LED display module.
c) The collection area of the color analyzer should cover no fewer than 20 × 20 adjacent pixels.
The test principles and procedures should follow the methods specified in Section 5.2.1 of SJ/T 11281-2017 and meet the following requirements:
a) When the full-screen white brightness is independent of the size of the white area, measurements can be conducted in full-screen mode.
b) If power load conditions do not permit full gray scale range patterns, smaller measurement areas, such as 25%-50% of the screen, should be used.
Note: A smaller measurement area, such as 25%-50%, implies that for a display screen area of 10 m², 25% indicates a white content area of 2.5 m² while the remaining 7.5 m² of the display shows a pure black image.
c) The brightness calculation method is detailed in Appendix A.
After completing the tests, determine whether the results meet the requirements of Section 5.7.1 and classify them into the corresponding grades.
6.8.2 Luminance Viewing Angle
Measure the horizontal and vertical luminance viewing angles of the Mini LED commercial display under specified conditions, as illustrated in Figures 1(a) and 1(b).
Test Conditions:
a) The test image should be a full white image (e.g., 8-bit signal, R=G=B=255).
b) Ambient illuminance should vary within ±10% without noticeable colored light sources.
c) The collection area of the color analyzer should cover no fewer than 20 × 20 adjacent pixels.
The test principle and test steps are carried out by the method specified in 5.2.1 of SJ/T 11281-2017 and meet the following requirements:
a) When the full-screen white brightness is independent of the size of the white area, the full-screen mode can be used for measurement;
b) When the power load cannot achieve the full grayscale range of the full-screen pattern, a smaller measurement area should be used, such as a measurement screen in the range of 25% to 50%.
Note: A smaller measurement area, such as a measurement screen in the range of 25% to 50%, means that the screen area of the display screen is 10m2, and 25% means that the white content only occupies 2.5 m2, and the remaining 7.5 m2 of the display screen displays a pure black screen.
c) For the brightness calculation method, see Appendix A.
After the test is completed, the results will be determined to meet the requirements of 5.7.1 and included in the corresponding level.
6.8.3 Chromaticity Viewing Angle
The chromaticity viewing angle is defined as the horizontal and vertical angles at which the chromaticity deviation Δu’v’ equals 0.020. The test is conducted as follows:
a) Use test images with full red, green, blue, and gray field signals.
b) Ensure ambient illuminance varies within ±10% and no noticeable colored light sources are present.
c) The color analyzer’s collection area should cover no fewer than 20 × 20 adjacent pixels.
6.8.4 Luminance Uniformity
Conduct the test following the methods specified in Section 5.2.7 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.7.4 and classify them accordingly.
6.8.5 Chromaticity Coordinate Deviation
Measure the chromaticity coordinates of the Mini LED display module using the methods specified in SJ/T 11281—2017. The test procedures are as follows:
a) Adjust the display’s color temperature to 3200K, 4500K, 5000K, 5600K, 6500K, 8000K, and 9300K.
b) At the highest grayscale and brightness levels, measure the chromaticity coordinates of the display using a color analyzer. The measurement area should include at least 20 × 20 pixels.
c) Record the chromaticity coordinates Xi, and Yi for each color temperature (3200K, 4500K, 5000K, 5600K, 6500K, 8000K, 9300K) and compare them with Table 14. Calculate the chromaticity coordinate deviation using formulas (11) and (12):
—X0, Y0 are the chromaticity coordinates corresponding to the blackbody curve trajectory.
—Xi, Yi are the actual measured chromaticity coordinates at each color temperature.
d) After completing the test, determine whether the results meet the requirements of Section 5.7.5 and classify them accordingly.
6.8.6 Primary Color Wavelength Deviation
Conduct the test following the methods specified in Section 5.2.4 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.7.6 and classify them accordingly.
6.8.7 Standard Color Temperature Coordinates
Measure the white field chromaticity coordinates of the full-color display using the methods specified in Section 5.2.5 of SJ/T 11281—2017. The test procedures are as follows:
a) At the highest grayscale and brightness levels, display the white, red, green, and blue fields on the screen.
b) Use a color analyzer to measure the chromaticity coordinates, covering at least 20 × 20 pixels.
c) Compare the results with Table 14 to determine whether they meet the requirements of Section 5.6.7.
6.8.8 Maximum Contrast Ratio
Conduct the test following the methods specified in Section 5.2.3 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.7.8 and classify them accordingly.
6.8.9 Color Gamut Coverage
Determine the color gamut coverage as the ratio of the overlap area between the triangle formed by the chromaticity points of the three primary colors (R, G, B) in the CIE 1931 chromaticity diagram and the triangle formed by the BT.2020 standard chromaticity points to the area of the BT.2020 gamut. The test method is as follows:
a) Test signals: full red, full green, and full blue field signals.
b) Test procedures:
1) Set the test sample to the measurement working state.
2) Under the conditions of full red, full green, and full blue fields, measure the chromaticity coordinates at the center point using a colorimeter.
3) The triangular calculation formula (13) is:
4) Calculate the coincidence area of the triangle formed with the BT.2020 primary color coordinates 𝑆𝑐oincide:
5) Calculate the color gamut coincidence degree with the formula (14)𝐺𝑐oincide:
6) After completing the test, determine whether the results meet the requirements of Section 5.7.9 and classify them accordingly.
6.9 Electrical Requirements
6.9.1 Grayscale Level
Conduct the test following the methods specified in Section 5.3.3 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.8.1.
6.9.2 Frame Rate
Conduct the test following the methods specified in Section 5.3.1 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.8.2 and classify them accordingly.
6.9.3 Refresh Rate
Conduct the test following the methods specified in Section 5.3.2 of SJ/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.8.3 and classify them accordingly.
6.10 Pixel Failure Rate
Conduct the test following the methods specified in Section 5.3.5 of J/T 11281—2017. After completing the test, determine whether the results meet the requirements of Section 5.9.
6.11 Energy Efficiency
6.11.1 Power Supply Efficiency and Power Factor
Test the power supply efficiency and power factor of single-output “AC-DC” and “AC-AC” external power supplies according to the methods specified in Appendix A of GB 20943—2013. For multi-output power supplies, follow the methods specified in Section 5.3.9 of GB/T 14714-2008. After completing the test, determine whether the results meet the requirements of Section 5.10.1 and classify them accordingly.
6.11.2 Energy Consumption Rating
Conduct the test as specified to determine the energy consumption rating.
a) Measure the display area S using formula (15):
S — Display area;
Dm — Fixed pixel diagonal length (in meters);
NH — Number of horizontal pixels;
NV — Number of vertical pixels.
b) Input a 100% color bar signal and measure the display’s power consumption W.
c) Calculate the power consumption per unit area e using formula (16):
𝑒 — Power consumption per unit area;
W — Power consumption of the display;
S — Display area.
d) Calculate the average power supply efficiency using formula (17):
η — Average power supply efficiency under stable operating conditions;
POX — Output active power;
PIX — Input active power.
e) Calculate the energy efficiency ξ using formula (18):
ξ — Energy efficiency;
LW — Maximum luminance;
S — Display area;
P — Power.
After completing the calculations, determine whether the results meet the requirements of Section 5.10.2 and classify them accordingly.
6.12 Environmental Adaptability
6.12.1 Operating Temperature Adaptability
Conduct tests for high-temperature operation, low-temperature operation, high-temperature storage, and low-temperature storage according to the methods specified in Sections 6.16.1 to 6.16.4 of SJ/T 11141—2017. After completing the tests, determine whether the results meet the requirements of Sections 5.11.2 and 9.3.
6.12.2 Damp Heat
Conduct tests for damp heat load and constant damp heat according to the methods specified in Sections 6.16.5.1 and 6.16.5.2 of SJ/T 11141—2017. After completing the tests, determine whether the results meet the requirements of Section 5.11.3.
6.12.3 Salt Spray
Conduct the salt spray test according to the methods specified in GB/T 2423.17—2008. After completing the test, determine whether the results meet the requirements of Section 5.11.4.
6.13 Mechanical Adaptability
6.13.1 Enclosure Protection Level
Conduct the test according to the methods specified in GB/T 4208—2017. Determine whether the results meet the requirements of Section 5.12.1.
6.13.2 Vibration
Conduct the vibration test according to the methods specified in Section 6.16.6 of SJ/T 11141—2017. After completing the test, determine whether the results meet the requirements of Section 5.12.2.
6.13.3 Transportation Test
Conduct the transportation test according to the methods specified in Section 6.16.7 of SJ/T 11141—2017. After completing the test, determine whether the results meet the requirements of Section 5.12.3.
6.14 Power Supply Adaptability
Test the samples under normal, minimum, and maximum voltage conditions. Allow sufficient time to achieve thermal stability. Perform a basic function check according to the requirements of Section 5.3, and determine whether the results meet the requirements of Section 5.13.
6.15 Electromagnetic Compatibility
Conduct the test according to the methods specified in Section 6.15 of SJ/T 11141—2017. After completing the test, determine whether the results meet the requirements of Section 5.14.
6.16 Noise
Conduct the noise test according to the methods specified in GB/T 4214.1—2017. Determine whether the results meet the requirements of Section 5.15.
6.17 Mean Time Between Failures (MTBF)
Conduct the test according to the methods specified in Section 6.17 of SJ/T 11141—2017. After completing the test, determine whether the results meet the requirements of Section 5.16.
7 Inspection Rules
7.1 General Provisions
Before the type approval of Mini LED commercial displays, an evaluation test should be conducted on the display modules. Quality consistency inspections during the production process must comply with batch-by-batch and periodic quality consistency requirements.
7.2 Display Module Evaluation Test
The evaluation test of the display module should be conducted in the following cases:
a) Before the first type approval and batch acceptance inspection of Mini LED commercial displays;
b) After formal production, if there are significant changes in key components, circuit design, process, structure, or materials that may affect product performance;
c) After production has been suspended for more than six months and is resumed;
d) When required by the contract;
e) When required by national quality supervision agencies.
The test items should include the requirements listed in Table 30.
7.3 Display Quality Consistency Inspection
Group A Inspection (Batch-by-Batch): Full inspection for small batches during product acceptance.
Group B Inspection (Batch-by-Batch): Sampling inspection during product acceptance.
Group C Inspection (Period): Conducted once a year in principle. Samples are randomly selected from those that passed batch acceptance inspections. The manufacturer may set the inspection frequency based on actual conditions.
7.4 Test Items and Sequence
The test items, technical requirements, test methods, and classification of defects for various product inspections shall comply with the requirements listed in Table 30.
No. | Test Item | Technical Requirements | Test Method | Nonconformity Classification | Display Module Evaluation Test | Display Quality Consistency Inspection | |||
A | B | C | |||||||
1 | Appearance | Basic Requirements | 5.2.1 | 6.3.1 | C | ● | ● | ● | ● |
2 | Ink Consistency | 5.2.2 | 6.3.2 | B | ● | ● | |||
3 | Sign | 5.2.3 | 6.3.3 | C | ● | ● | ● | ||
4 | Structure | Basic Requirements | 5.3.1 | 6.4.1 | B | ● | ● | ● | ● |
5 | Structure size | 5.3.2 | 6.4.2 | C | ● | ● | ● | ● | |
6 | Mini LED Adhesive Force | 5.3.3 | 6.4.3 | B | ● | ● | |||
7 | Structure Assembly Accuracy | 5.3.4 | 6.4.4 | B | ● | ● | ● | ||
8 | Resource and Environmental Protection | 5.3.5 | 6.4.5 | C | ◎ | ◎ | ◎ | ◎ | |
9 | Basic Functions | 5.4 | 6.5 | —— | ● | ● | ● | ||
10 | Interface Requirement | Physical Interface | 5.5.1 | 6.6 | B | ● | ● | ● | ● |
11 | Interconvertibility | 5.5.2 | C | ● | |||||
12 | Compatibility | 5.5.3 | C | ● | |||||
13 | Safety Requirements | Electric Safety | 5.6.1 | 6.7.1 | A | ● | ● | ● | ● |
14 | Vision Health | 5.6.2 | 6.7.2 | A | ● | ● | ● | ||
15 | Optical Property | Maximum Brightness | 5.7.1 | 6.8.1 | B | ● | ● | ||
16 | Luminance Angle | 5.7.2 | 6.8.2 | B | ● | ● | |||
17 | Chroma can be Viewed | 5.7.3 | 6.8.3 | B | ◎ | ||||
18 | Uniformity of luminance | 5.7.4 | 6.8.4 | B | ● | ||||
19 | Color Coordinate Error | 5.7.5 | 6.8.5 | B | ● |
No. | Test Item | Technical Requirements | Test Method | Nonconformity Classification | Display Module Evaluation Test | Display Quality Consistency Inspection | |||
A | B | C | |||||||
Optical Property | Primary Wavelength Error | 5.7.6 | 6.8.6 | B | ● | ● | |||
Standard Color Temperature Coordinates | 5.7.7 | 6.8.7 | B | ● | |||||
Maximum Contrast | 5.7.8 | 6.8.8 | B | ● | |||||
Gamut Coverage | 5.7.9 | 6.8.9 | B | ● | |||||
20 | Electrical Requirement | Gray Scale | 5.8.1 | 6.9.1 | B | ● | |||
21 | Repetition Frequency | 5.8.2 | 6.9.2 | B | ● | ||||
22 | Refresh Rate | 5.8.3 | 6.9.3 | B | ● | ||||
23 | Pixel Runaway Rate | 5.9 | 6.10 | A | ● | ● | ● | ||
24 | Energy Efficiency | The Average Power Efficiency and Power Factor | 5.10.1 | 6.11.1 | B | ● | ● | ||
25 | Energy Level | 5.10.2 | 6.11.2 | C | ● | ● | |||
26 | Climate Adaptability | Working Environment Requirement | 5.11.1 | —— | C | ● | |||
27 | Working Temperature Environment Adapts to Nature | 5.11.2 | 6.12.1 | B | ● | ||||
28 | Moist Heat | 5.11.3 | 6.12.2 | B | ● | ||||
29 | Salt Spray | 5.11.4 | 6.12.3 | B | ● | ||||
30 | Mechanical Environment Adaptability | Enclosure Protection Class | 5.12.1 | 6.13.1 | B | ● | |||
31 | Vibration | 5.12.2 | 6.13.2 | B | ● | ||||
32 | Transportation | 5.12.3 | 6.13.3 | B | ● | ●b | |||
33 | Power Supply Adaptability | 5.13 | 6.14 | B | ● | ● | ● | ||
34 | Electromagnetic Compatibility | Radio Disturbance | 5.14.1 | 6.15 | B | ● | |||
35 | Harmonic Current | 5.14.2 | B | ● | ● | ||||
36 | Noise Immunity | 5.14.3 | B | ● | ● | ||||
37 | Noise | 5.15 | 6.16 | B | ● | ||||
38 | The mean working time between failures | 5.16 | 6.17 | B | ● | ||||
a) Basic Function Evaluation: The severity of defects in the basic function items should be determined based on the importance of these functions to the end user. b) Transportation Test for Vehicle-Mounted Mobile Displays: Conduct a transportation test for vehicle-mounted mobile displays. |
Note 1: In Table 30, A indicates a high degree of defect; B represents moderate defect; C stands for low degree defect.
Note 2: In Table 30, the “●” item indicates the mandatory item; A “◎” item indicates an optional item.
7.5 Sampling and Grouping Rules
7.5.1 Grouping Rules
The batch for acceptance inspection should consist of products from the same production batch.
7.5.2 Sampling Rules
The following requirements apply:
a) The number of samples for qualification testing should be no less than one, selected randomly.
b) Group A inspection requires a full inspection of all units.
c) The number of samples for Group B inspection should be randomly selected according to GB/T 2828.1—2012.
d) The number of samples for Group C inspection should be randomly selected according to GB/T 2829—2002.
7.6 Determination Rules
7.6.1 Inspection Level
Unless otherwise specified, inspection level II is generally adopted. In Group B inspections, the acceptable quality limit (AQL) for Class B and Class C non-conforming products is 1.5.
7.6.2 Conformance Determination
Conformance determination for samples is carried out based on the test items, technical requirements, and test methods specified in Table 30. If there is one non-conforming item in Class A, the product is judged as non-conforming. If there is one non-conforming item in Class B or Class C, the product is still considered conforming. If there are two non-conforming items in Class B or three in Class C, the product is considered non-conforming.
All samples in a full inspection must conform. For sampled inspections, if the number of non-conforming items is less than or equal to the acceptance number (Ac), the batch is considered conforming; if the number of non-conforming items is greater than or equal to the rejection number (Re), the batch is considered non-conforming.
7.6.3 Handling of Non-conforming Products
Non-conforming products within a conforming batch should be replaced or repaired by the manufacturer to make them conforming.
If a Group B or Group C inspection fails, testing should be halted for the representative batch of products, and the cause of the non-conformity should be analyzed and eliminated before resubmission for inspection.
7.6.4 Resubmission of Batches
If a batch fails inspection, it may be resubmitted after repairs, adjustments, and subsequent compliance testing. If the batch fails again, it may be rejected until the cause is identified and corrective actions are taken, after which new periodic testing must be conducted before resuming normal production and acceptance inspections.
8 Markings, Labels, and Accompanying Documents
8.1 Markings
The markings on Mini LED commercial displays should meet the following requirements:
a) Data and power interfaces of the Mini LED display module should have corresponding markings indicating their function or purpose.
b) If grounding is required, there should be a grounding mark in compliance with GB 4943.1-2011.
c) Components, parts, and areas that may pose a risk of exceeding the safe voltage range should have high voltage warning labels prominently displayed in the relevant areas.
d) Areas or locations on the display enclosure with local temperature rises exceeding safe limits should have high-temperature warning labels.
8.2 Sign
Product labels or nameplates should be placed in appropriate locations on Mini LED commercial displays or display modules, including the following information:
a) Manufacturer’s name or trademark;
b) Product name or model specifications;
c) Production date;
d) Certification mark;
e) Electrical input and output parameters;
f) Other necessary warning symbols, such as safety warning symbols, grounding symbols, high voltage symbols, etc.;
g) Nature and polarity of the power supply;
h) Nature and function of the wiring terminals.
8.3 Accompanying Documents
The following requirements must be met:
a) According to the relevant requirements of GB/T 14436-1993, Mini LED commercial displays and display modules should provide proof of product quality, i.e., a product qualification certificate.
b) The packaging of Mini LED commercial displays should contain a product qualification certificate, user manual, packing list, spare parts and accessories list, and accompanying documents.
9 Packaging, Transportation, and Storage
9.1 Packaging
Packaging should meet requirements for moisture-proofing, shock-proofing, corrosion resistance, impact resistance, and compression resistance, with an aesthetically pleasing appearance. The markings on the packaging boxes should comply with GB/T 191 requirements.
9.2 Transportation
Packaged Mini LED commercial displays and display modules can be transported using any means of transportation (such as cars, trains, airplanes, etc.). During transportation, avoid exposure to rain, prolonged sunlight, corrosive gases, and mechanical damage.
9.3 Storage
Mini LED commercial displays should be stored at temperatures between -40℃ to 55℃, with a relative humidity not exceeding 90%. The surrounding environment should be free of acidic or alkaline gases, strong mechanical vibrations, shocks, and strong magnetic fields. If the storage period exceeds six months, an unpacking inspection and a 30-minute normal operation with power on should be conducted.
10 Application Environment Requirements
Mini LED commercial displays should meet the following application environment requirements:
a) Operate within a temperature range of -10℃ to 40℃ and a relative humidity range of 10% to 90% (non-condensing);
b) Be installed on a sturdy and stable structure with no significant vibrations;
c) Avoid installation near strong electromagnetic fields or heat sources, and avoid environments containing acidic, alkaline, or other corrosive gases;
d) Ensure the stability of the power supply system, maintaining normal levels of frequency, voltage, and current harmonics;
e) The power supply system should have a grounding design, lightning protection, and leakage protection.
Appendix A
(Informative)
Method for Calculating Display Brightness
The brightness is calculated according to formulas (A.1), (A.2) and (A.3) in accordance with the EOTF provisions in Appendix 1 of ITU-R BT.186:2011.
𝐿——Screen brightness measured in cd/m2;
𝑎 ——User gain variable (traditional “contrast” control);
𝑉 ——Input video signal level (standardized, black is 𝑉 = 0, white is 𝑉 = 1);
𝑏 ——User black level boost variable (traditional “brightness” control);
𝛾 ——Power function exponent, 𝛾= 2.40;
𝐿𝑤 ——White brightness of the screen;
𝐿𝐵——Black brightness of the screen.
The above variables 𝑎 and 𝑏 can be solved by formula (A.4) and (A.5). When V=1, L=𝐿𝑊; When V=0, L=𝐿𝐵.
Note: The EOTF calculation formula is defined here. If you need to confirm that the display meets the above calculation formula, it is recommended to measure in a dark room.
References
[1] SJ/T11711-2018 Acceptance Specifications for Multimedia Systems of Indoor LED Displays
[2] SJ/T11343-2015 General Specifications for Digital Television LCD Monitors
[3] SJ/T11348-2016 Measurement Methods for Display Performance of Flat Panel Televisions
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