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SJ/T 11141-2017 (SJT 11141-2017)

SJ/T 11141-2017_English: PDF (SJT11141-2017)
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BASIC DATA
Standard ID SJ/T 11141-2017 (SJ/T11141-2017)
Description (Translated English) Generic specification for LED displays
Sector / Industry Electronics Industry Standard (Recommended)
Classification of Chinese Standard L47
Classification of International Standard 31.120
Word Count Estimation 23,233
Date of Issue 2017-11-07
Date of Implementation 2018-01-01
Older Standard (superseded by this standard) SJ/T 11141-2012
Quoted Standard GB/T 191; GB/T 2423.1-2008; GB/T 2423.2-2008; GB/T 2423.3-2006; GB/T 2828.1-2012; GB 4208-2008; GB 4943.1-2011; GB/T 6388-1986; GB/T 6587-2012; GB 9254-2008; GB/T 11463-1989; GB 20943-2013; SJ/T 10463-1993; SJ/T 11218-2017; CIE 1931; GB/T 17618-2015
Drafting Organization TCL Semiconductor Light Source Research Institute
Administrative Organization Institute of Electronics Industry Standardization, Ministry of Industry and Information Technology
Regulation (derived from) Ministry of Industry and Information Technology Announcement No. 48 of 2017
Summary This standard specifies the terms and definitions, classification, technical requirements, inspection methods, inspection rules, and marking, packaging, transportation and storage requirements for LED displays.

SJ/T 11141-2017
SJ
ELECTRONICS INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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 
Generic specification for LED displays
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
GB 20943-2013, Minimum allowable values of energy efficiency and
evaluating values of energy conservation for single voltage external AC-DC
and AC-AC power supplies
SJ/T 10463-1993, Requirements of packing, marking and storage for
electronic measuring instruments
SJ/T 11281-2017, Measure methods of light emitting diode (LED) displays
CIE 1931, Color space
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.
3.16 Pixel intensity uniformity; IPU
The consistency of the luminous intensity of each pixel in the LED display.
3.17 luminance uniformity of display module; IMU
The brightness consistency of each display module, which is called luminance
uniformity of module.
3.18 color un-uniformity of display module; CMJ
The inconsistency of the chromaticity of each display module, which is called
color un-uniformity of module.
3.19 luminance uniformity of display assembly; IGU
The brightness consistency between modules, which is called luminance
uniformity of assembly.
3.20 color un-uniformity of display assembly; CGJ
The inconsistency of chromaticity between modules, which is called color un-
uniformity of assembly.
3.21 maximum contrast ratio
Under a certain environmental illumination, the ratio of the maximum luminance
of the LED display to the background luminance.
3.22 out of control pixel
LED pixel whose light-emitting state does not match the display state required
by the control.
3.23 refresh frame frequency
The number of times of updates per second that the LED display displays.
3.24 refresh ratio
The number of times of displayed information per second that the LED display
displays.
3.25 critical defect
The following provisions are critical defects:
1) Defects that may cause hazards or unsafe conditions to the use and
maintenance of the LED display or personnel related to it;
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. If designing serialized products,
the design principles of serialization, standardization, modularization and
backward compatibility shall be followed, according to relevant standards.
5.1.2 Software
The configured software shall be adapted to the hardware resources of the
hardware system. In addition to meeting application functions, corresponding
maintenance and testing procedures shall also be provided. The software of the
same series of products shall follow the design principles of serialization,
standardization, modularization, Chinese localization and backward
compatibility. The character set encoding and font shall comply with the relevant
standards.
5.1.3 Structure
5.1.3.1 Structural design shall follow the requirements of standardization and
serialization and meet the characteristics of ergonomics. And it shall have a
good heat dissipation structure and heat dissipation measures.
5.1.3.2 The display structure of the LED display can be made of steel, aluminum,
plastic and other materials. The structure is safe and robust.
5.1.3.3 The common dot pitches are: 0.7, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 1.9, 2.0,
2.4, 2.5, 2.8, 3.0, 4.0, 4.7, 5.0, 6.0, 7.62, 8.0, 10, 12, 14, 16, 18, 20, 22, 25, 28,
31.25, 40, in millimeters (mm).
5.1.4 Packaging materials
In packaging design, priority shall be given to materials that meet environmental
The test voltage specified in 6.8.5 is applied between the two poles of the power
supply of the display assembly constituting the LED display, between the two
poles of the power supply and the protective ground. No insulation breakdown
shall occur during the test.
5.7.6 Temperature rise
After the LED display reaches thermal equilibrium during normal use, the
temperature rise of the metal part of the panel structure shall not exceed 45K.
The temperature rise of the insulating material shall not exceed 70K.
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
5.9.1 The text LED display shall have text display function and comply with
detailed specification.
5.9.2 The graphic LED display shall have text and graphic display functions and
comply with the detailed specification.
5.9.3 The video LED display shall have the functions of text display, animation
and displayable video signals, and shall comply with the detailed specification.
5.9.4 Special application display function shall comply with detailed
specification.
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.
5.10.2 View angle
The view angle of the LED display assembly and the LED display shall meet
the requirements of detailed specification.
5.13.1 The power supply of the LED display is 220(1±10%)V, (50±1)Hz or
380(1±10%)V, (50±1)Hz.
5.13.2 The maximum power consumption per unit display area of various LED
displays or the total power consumption of the LED display shall be specified in
the detailed specification.
5.14 Electromagnetic compatibility
5.14.1 General rules
Unless otherwise specified, the display assembly composing the indoor LED
display shall be tested for electromagnetic compatibility.
5.14.2 Radio disturbance
The radio disturbance limit of the display assembly composing the indoor LED
display shall meet the requirements of GB 9254-2008. In the detailed
specification, the radio disturbance limit specified by level A or level B shall be
clearly selected.
5.14.3 Immunity
The immunity limit of display assembly composing the indoor LED display shall
meet the requirements of GB/T 17618-2015.
5.15 Environmental adaptability
5.15.1 General rules
After each test, the testing of test samples shall meet the following requirements:
a) The appearance of the test sample shall meet the requirements of 5.4.
The functional characteristics shall meet the requirements of 5.9;
b) The ratio of the total number of out-of-control pixels of all test samples of
an inspection batch to the total number of pixels in the batch shall meet
the requirements of the pixel out-of-control rate of the entire panel in Table
12.
5.15.2 High-temperature work
Recommended high-temperature working environment temperature:
a) The display assembly that composes the indoor LED display
40°C.
b) The display assembly that composes the outdoor LED display
Carry out to the display assembly that composes the LED display at the
maximum working environment temperature. The relative humidity is 87%~93%,
and the power is on for 8h.
5.15.6.2 Constant damp heat
Unless otherwise specified, the ambient temperature of the display assembly
composing the indoor LED display is 40°C. The ambient temperature of the
display assembly composing the outdoor LED display is 50°C. The relative
humidity is 87%~93%. The storage is 48h.
5.15.7 Vibration
Carry out to the display assembly that composes the LED display. Under the
conditions that the vibration frequency is 5Hz~55Hz~5Hz, the amplitude is
0.19mm, scan for 5min at a time. Scan twice separately for two perpendicular
axes.
5.15.8 Transportation test
5.15.8.1 Transportation test of display assembly
The transportation test for the display assembly is carried out in accordance
with the level-three circulation conditions specified in GB/T 6587-2012.
5.15.8.2 Transportation test of LED display (when specified)
Unless otherwise specified, the transportation test shall be carried out for
vehicle mobile LED display.
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
6.1.1 Standard atmospheric conditions
Ambient temperature: 15°C~35°C;
Relative humidity: 20%~80%;
Atmospheric pressure: 86kPa~106kPa.
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
6.8.4.1 Under 1.1 times rated power supply voltage, use a leakage current
tester to test the leakage current between the power cord of the display
assembly forming the LED display and the metal frame (connected to the
protective ground), which shall meet the requirements of 5.7.4.
6.8.4.2 For the display assembly that its circuit analysis shows that the leakage
current to the ground exceeds 3.5mA/m2, but it does not exceed 5% of the input
current, the randomly selected display module shall be tested for ground
leakage current according to 6.8.4.1, which shall meet the requirements of 5.7.4.
6.8.5 Dielectric strength
For the display assembly forming the LED display, apply a 50Hz basic sine
wave, 1500V (effective value) test voltage between the AC power input end and
the metal frame or accessible metal structure (connected to the protective
ground), for 1min, which shall meet the requirements of 5.7.5.
6.8.6 Temperature rise
6.8.6.1 According to the provisions of GB 4943.1-2011.
6.8.6.2 After the LED display works under full load for 30min, use a
thermometer to test the temperature of each accessible point, which shall meet
the requirements of 5.7.6.
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
in 5.2.6 of SJ/T 11281-2017, which shall meet the requirements of 5.10.6.
6.11.7 Maximum contrast ratio
Measure the maximum contrast ratio according to the method specified in 5.2.3
of SJ/T 11281-2017, which shall meet the requirements of 5.10.7.
6.12 Electrical performance
6.12.1 Gray scale
Measure the gray scale according to the method specified in 5.3.3 of SJ/T
11281-2017, which shall meet the requirements of 5.11.1.
6.12.2 Refresh frame frequency
Measure the refresh frame frequency according to the method specified in 5.3.1
of SJ/T 11281-2017, which shall meet the requirements of 5.11.2.
6.12.3 Refresh ratio
Measure the refresh ratio according to the method specified in 5.3.2 of SJ/T
11281-2017, which shall meet the requirements of 5.11.3.
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
6.15.1 General rules
Unless otherwise specified, the electromagnetic compatibility test method of the
display assembly composing the indoor LED display shall be conducted in
accordance with the provisions of this Specification.
6.15.2 Radio disturbance
The test of the radio disturbance limit of the display assembly used in the indoor
LED display is carried out according to the method specified in GB 9254-2008,
which shall comply with the provisions of 5.14.2.
The constant damp heat test is performed on the display assembly according
to the provisions of GB/T 2423.3-2006. Unless otherwise specified, when the
display assembly that composes the indoor LED display is at (40±2)°C and the
relative humidity is 87%~93%, when the display assembly that composes the
outdoor LED display is at (50±2)°C and the relative humidity is 87%~93%, store
for 48h. After the test is over, immediately measure the ground leakage current,
dielectric strength and temperature rise, which shall meet the requirements of
5.7.4, 5.7.5 and 5.7.6. After 4h of recovery at room temperature, check the LED
display, which shall meet the requirements of 5.15.6.2.
6.16.2 Vibration
Vibration test is carried out on the display assembly according to 5.9.3 of GB/T
6587-2012. After the test, test the display module, which shall meet the
requirements of 5.15.7.
6.16.7 Transportation test
6.16.7.1 Transportation test of display assembly
Conduct the test to the display assembly according to the level-3 circulation
conditions in 5.10.1.3 of GB/T 6587-2012. Test the test sample after the test,
which shall meet the requirements of 5.15.1.
6.16.7.2 Transportation test of LED display
For the vehicle mobile LED display, it shall simulate on-site transportation
conditions to test or follow the detailed specification. After the test, test the
appearance quality and functional characteristics, which shall meet the
requirements of 5.4, 5.9 and 5.12.
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. α=20%, β=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
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:
a) Trademark;
b) Product name or model;
c) Production date;
d) Name of manufacturer.
8.2.2 Packaging marks
The mark of the outer packaging box of the LED display shall comply with GB/T
6388-1986 and the following requirements:
a) Product name or model;
b) Trademark;
c) Name of manufacturer;
d) Pictorial signs such as "upward" and "fear of rain". These signs shall
comply with the regulations of GB/T 191-2008;