SJ/T 11141-2025 (SJ/T 11141-2017) PDF English
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Generic specification for LED displays
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SJ/T 11141-2017: Generic specification for LED displays---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/SJT11141-2017
SJ
ELECTRONICS INDUSTRY STANDARD
ICS 31.120
L 47
File No..
Replacing SJ/T 11141-2012
Generic specification for LED displays
Issued on. NOVEMBER 07, 2017
Implemented on. JANUARY 01, 2018
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions and symbols... 6
4 Classification... 9
5 Requirements... 10
6 Inspection and test methods... 18
7 Inspection rules... 24
8 Marks, packaging, transportation, storage... 29
1 Scope
This Specification specifies terms and definitions, classification, technical
requirements, inspection methods, inspection rules as well as marks,
packaging, transportation and storage requirements of LED displays.
This Specification is applicable to LED display products.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 2423.1-2008, Environmental testing - Part 2.Test methods - Tests A.
Cold
GB/T 2423.2-2008, Environmental testing - Part 2.Test methods - Tests B.
Dry heat
GB/T 2423.3-2006, Environmental testing for electric and electronic products
- Part 2.Testing method test Cab. Damp heat Steady state
GB/T 2828.1-2012, Sampling procedures for inspection by attributea - Part
1.Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB 4208-2008, Degrees of protection provided by enclosure (IP code)
GB 4943.1-2011, Information technology equipment -Safety - Part 1.General
requirements
GB/T 6388-1986, Transportation package shipping mark
GB/T 6587-2012, General specification for electronic measuring instruments
GB 9254-2008, Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement
GB/T 11463-1989, Reliability test for electronic measuring instruments
GB/T 17618-2015, Information technology equipment - Immunity
characteristics - Limits and methods of measurement
3 Terms, definitions and symbols
For the purposes of this document, the following terms and definitions apply.
3.1 LED displays
A device for displaying text, image, video and other information with LED pixels,
usually including basic components such as LED panel and display control
system; it may also include support system and so on. It may adopt one-piece
or split structure.
3.2 LED panel
It is spliced by one or several display modules. It may be controlled by the
display control system to complete the screen display.
3.3 display control system
It is usually composed of a video processor, signal conditioning transmitter,
signal receiving distributor and related playback control display software and so
on. It may also include various signal sources and matrix switchers.
3.4 support system
Supporting equipment for the LED display. It usually includes power supply and
distribution system, audio system, temperature regulation system, lightning
protection system and security system.
3.5 gray scale
The maximum brightness level of any primary color of the LED display from the
darkest to the brightest.
3.6 pixel
The smallest imaging unit of the LED display.
4 Classification
4.1 Use environment
The LED displays are divided into indoor LED displays and outdoor LED
displays according to the use environment.
4.2 Display color
The LED displays are divided into single color, multi-color, and full-color LED
displays according to the display color.
4.3 Display function
According to the display function, LED displays are divided into text LED display,
graphic LED display, video LED display and special application LED display.
4.4 Display dimensions
The LED display can be divided into 2D display and stereo (3D) display
according to display dimensions.
4.5 Panel appearance state
The LED displays are divided into planar and non-planar types according to the
appearance of panel.
4.6 Pixel pitch
According to the pixel pitch, the LED display is divided into common pitch and
small pitch.
5 Requirements
5.1 Design and structure
5.1.1 Hardware
When designing LED displays, it shall perform designs on safety,
electromagnetic compatibility, reliability, maintainability, ease of use,
environmental adaptability and energy-saving.
5.1.4 Packaging materials
In packaging design, priority shall be given to materials that meet environmental
protection requirements for packaging and cushioning materials.
5.2 Hardware environment
The LED display hardware part includes the LED panel, display control system,
auxiliary system and so on. When applicable, the detailed specification shall be
explained according to the classification of the LED display.
5.3 Software environment
For the LED display with different functions, it can be equipped with the display
software that can meet its display function requirements.
5.4 Appearance quality
The external surface of the LED display shall have no obvious scratches. The
installation of the LED display assembly shall be consistent, without looseness
and crack.
5.5 Enclosure protection level
The enclosure protection level of the LED display panel is indicated by F, which
shall be specified in the detailed specification. The corresponding classification
registration shall be selected from Table 1.
5.6 Assembly accuracy
The assembly accuracy of the LED display shall be specified in the detailed
specification. Level up degree level P, dot pitch relative deviation level JX,
horizontal relative misalignment level CS and vertical relative misalignment
level CC are selected from Table 2 ~ Table 5, respectively.
5.7 Safety requirements
5.7.1 General rules
The safety performance of the LED display shall meet the requirements of GB
4943.1-2011.
5.8 Energy saving
5.8.1 Average power efficiency
At room temperature, the power factor of the LED display power supply is not
less than 90%, and the conversion efficiency is not less than 70%.
5.8.2 Luminance adjustment
The outdoor LED display shall have the function of automatically adjusting the
luminance with the change of the environmental illumination.
5.9 Functional characteristics of LED display
5.10 Optical characteristics
5.10.1 Maximum luminance
The maximum luminance of the LED display assembly and the LED display
shall comply with the detailed specification.
5.11 Electrical characteristics
5.11.1 Gray scale
The gray scale of the LED display assembly and the LED display shall meet the
requirements of detailed specification.
5.14 Electromagnetic compatibility
5.15 Environmental adaptability
5.16 Mean time between failures
The average failure interval working time of the LED display, MTBF (), is not
less than 5000h.
6 Inspection and test methods
6.1 Test conditions
6.2 Structure
Visually inspect the structure of the LED display, which shall meet the
requirements of 5.1.3.
6.7 Assembling accuracy
Use a universal measuring tool of which its accuracy meets 0.02mm to measure
the assembling accuracy of the LED display, which shall meet the requirements
of 5.6.
6.8 Safety requirements
6.8.1 General rules
The LED display that has been tested for safety shall meet relevant
requirements of 5.7.1.
6.8.2 Grounding
In accordance with the provisions of GB 4943.1-2011, the grounding continuity
of the LED display and the grounding resistance of the protective connecting
conductor are assessed, which shall meet the requirements of 5.7.2.
6.8.3 Safety marks
Visually inspect the protective ground terminal mark and warning mark of the
LED display. And in accordance with the provisions of GB 4943.1-2011, conduct
the mark durability test for the marks of the LED display, which shall meet the
requirements of 5.7.3.
6.8.4 Ground leakage current
6.9 Energy saving
6.9.1 Average power efficiency
Test the average efficiency of the power supply of the LED display according to
the provisions of Annex A of GB 20943-2013, which shall meet the requirements of 5.8.1.
6.9.2 Luminance adjustment
The function of adjusting the luminance of the LED display with the change of
the environmental illumination, is tested according to the method specified in
5.3.6 of SJ 11281-2017.
6.10 Functional characteristics of LED display
6.11 Optical performance
6.11.1 Maximum luminance
Measure the maximum luminance according to the method specified in 5.2.1 of
SJ/T 11281-2017, which shall meet the requirements of 5.10.1.
6.11.2 View angle
Measure the view angle according to the method specified in 5.2.2 of SJ/T
11281-2017, which shall meet the requirements of 5.10.2.
6.12 Electrical performance
6.13 Pixel out of control rate
Measure the out of control pixel according to the method specified in 5.3.5 of
SJ/T 11281-2017, which shall meet the requirements of 5.12.
6.14 Power supply
Use a voltmeter and other instruments to measure the power supply of the LED
display. The maximum power consumption per unit display area or the total
power consumption of the LED display is measured according to the detailed
specification, which shall meet the requirements of 5.13.
6.15 Electromagnetic compatibility
6.16 Environmental adaptability
6.16.5 Damp heat
6.16.7 Transportation test
6.17 Mean time between failures
The inspection of average failure interval working time of the LED display, MTBF,
is according to the timed fixed number censoring test program 1-2 specified in
GB/T 11463-1989.��=20%, ��=20%, Dm=3.0.
7 Inspection rules
7.1 Inspection classification
This Specification specifies the evaluation of display assembly, type inspection
and delivery inspection of LED displays.
7.2 Batching rules of inspection batch
7.2.1 Composition of inspection batch of display assembly
An inspection batch used for display assembly evaluation can consist of one or
several display assembly production batches that meet the following conditions.
7.2.2 Composition of inspection batch of LED display
Unless otherwise specified, an LED display inspection batch can be made up
of LED displays that are manufactured using the same process and the
production batch does not exceed one month.
7.3 Display assembly evaluation
7.3.1 General rules
In one of the following cases, before assembling the LED display, the display
assembly used to assemble the LED display must be evaluated.
7.3.2 Evaluation items
The evaluation items and order of the display assembly shall be in accordance
with the provisions of Table 13.
7.3.3 Sample extraction
The samples provided for the evaluation of the display assembly shall be taken
from the display assembly inspection batch used to assemble the LED display.
7.3.4 Sampling plan
According to the normal inspection plan of GB/T 2828.1-2012, the general
inspection level is II, AQL=1.5.
7.3.5 Rejection
During the evaluation process of the display assembly, if there is a well-known
defect or two or more non-critical defects, the evaluation inspection batch of the
display assembly shall be rejected as a nonconforming batch.
7.3.6 Resubmission
When the display assembly evaluation test is nonconforming, it is allowed to
resubmit after repairing or rejecting the nonconforming product. Sampling plan
and determination criteria for the nonconforming remain unchanged. If it is still
nonconforming after resubmission of evaluation, it is not allowed to use this
batch of display assemblies to assemble the LED display.
7.4 Type inspection
7.4.4 Sampling plan
Four sets are extracted for display assembly. One piece is extracted for LED
display.
7.4.5 Rejection
In the process of type inspection, if there is one critical defect or two or more
non-critical defects, the type inspection is deemed nonconforming.
7.4.6 Resubmission
When the type inspection is nonconforming, it is allowed to resubmit after
repairing or rejecting the nonconforming product. The sampling plan remains
the same, but one critical defect or two or more non-critical defects are not
allowed.
7.5 Delivery inspection (only for LED display)
7.5.3 Sampling plan
The sampling plan for delivery inspection is 100%.
7.5.4 Rejection
Unless otherwise specified in the contract, during the delivery inspection
process, if there is a critical defect or more than two non-critical defects, the
delivery inspection shall be deemed nonconforming.
7.5.5 Resubmission
When the delivery inspection is nonconforming, the first resubmission is
allowed after repair. The sampling plan remains unchanged. But no defects are
allowed, otherwise, it shall be deemed nonconforming for the first resubmission
of inspection. However, if the first resubmission is nonconforming because
there is only one critical defect or two or less non-critical defects, a second
resubmission after repair is allowed. No defects are allowed. If the second
resubmission is still nonconforming, it shall be rejected.
8 Marks, packaging, transportation, storage
8.1 General rules
The packaging, marks and storage of the LED display shall meet the requirements of SJ/T 10463-1993.
8.2 Marks
8.2.1 Product marks
The nameplate shall be installed on the appropriate position of the LED display.
The nameplate must contain the following.
8.3 Packaging
8.4 Transportation
The packaged LED display can be transported by any means of transportation
(such as cars, trains, planes and other ordinary means of transportation). But
the transportation process shall avoid rain, long sun, contact with corrosive gas
and mechanical damage.
8.5 Storage
The storage temperature range of the LED display is -40��C~60��C. The relative
humidity is not more than 80%. There is no acid, alkali and corrosive gas in the
surrounding environment, and no strong mechanical vibration, shock and
strong magnetic field.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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