GB/T 43770-2024 PDF English
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Specification for indoor LED displays
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GB/T 43770-2024: PDF in English (GBT 43770-2024) GB/T 43770-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 31.120
CCS L 53
Specification for indoor LED displays
ISSUED ON. MARCH 15, 2024
IMPLEMENTED ON. MARCH 15, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Classification... 9
5 Requirements... 9
5.1 Appearance... 9
5.2 Safety requirements... 10
5.3 Electromagnetic compatibility... 10
5.4 Structure... 10
5.5 Degree of protection provided by enclosure... 11
5.6 Optical properties... 11
5.7 Electrical characteristics... 12
5.8 Low brightness characteristics... 13
5.9 Environmental adaptability... 14
5.10 Energy conservation... 14
6 Test method... 15
6.1 Test conditions... 15
6.2 Appearance... 15
6.3 Safety requirements... 15
6.4 Electromagnetic compatibility... 15
6.5 Structure... 15
6.6 Degree of protection provided by enclosure... 15
6.7 Optical properties... 15
6.8 Electrical characteristics... 18
6.9 Low brightness characteristics... 20
6.10 Environmental adaptability... 20
6.11 Energy conservation... 21
7 Inspection rules... 21
7.1 Inspection classification... 21
7.2 Inspection batch grouping rules... 21
7.3 Display module evaluation... 21
7.4 Type inspection... 22
7.5 Acceptance inspection... 23
8 Marking, packaging, transportation and storage... 24
Appendix A (Informative) Pixel luminous color CIE1931 chromaticity area diagram
... 25
Appendix B (Informative) Radio disturbance limit test pattern procedure... 26
B.1 Overview... 26
B.2 Test procedure... 26
B.3 Program execution view... 26
Appendix C (Informative) Non-uniformity test pattern procedure... 27
C.1 Overview... 27
C.2 Test procedure... 27
C.3 Test pattern diagram... 27
C.4 Program usage steps and execution diagram... 28
Bibliography... 30
Specification for indoor LED displays
1 Scope
This document specifies the classification, requirements, test methods, inspection rules,
as well as marking, packaging, transportation and storage for indoor LED displays
(hereinafter referred to as “displays”).
This document applies to full-color large pixel pitch, meddle pixel pitch, fine pixel pitch,
mini pixel pitch, and micro pixel pitch display products that display graphics, text, video
and other information.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 2423.1, Environmental testing for electric and electronic products - Part 2.
Test methods - Tests A. Cold
GB/T 2423.2, Environmental testing for electric and electronic products - Part 2.
Test methods - Tests B. Dry heat
GB/T 2423.3, Environmental testing - Part 2.Testing method - Test Cab. Damp
heat, steady state
GB/T 2423.10, Environmental testing - Part 2.Test methods - Test Fc. Vibration
(sinusoidal)
GB/T 4208, Degrees of protection provided by enclosure (IP code)
GB/T 9254.1, Information technology equipment, multimedia equipment and
receivers - Electromagnetic compatibility - Part 1.Emission requirements
GB 17625.1, Electromagnetic compatibility - Limits - Part 1.Limits for harmonic
current emissions (equipment input current ≤ 16A per phase)
GB/T 20147-2006, CIE standard colorimetric observers
SJ/T 11141, Generic specification for LED displays
SJ/T 11281, Measure methods of light emitting diode (LED) displays
A vertical deviation from top to bottom or a vertical deviation from left to right of the
display.
3.15
visual refresh ratio
The number of times the information displayed per second on the LED display.
4 Classification
4.1 According to the content played, displays can be divided into graphic displays and
video displays.
4.2 According to the display dimension, displays can be divided into two-dimensional
(2D) displays and three-dimensional (3D) displays (or stereoscopic displays).
4.3 According to the usage, displays can be divided into fixed displays and non-fixed
displays.
4.4 According to the installation method, displays can be divided into front installation
displays and rear installation displays.
4.5 According to the maintenance method, displays can be divided into front
maintenance displays and rear maintenance displays.
4.6 According to the pixel on centers, displays can be divided into large pixel pitch
displays, middle pixel pitch displays, fine pixel pitch displays, mini pixel pitch displays
and micro pixel pitch displays.
5 Requirements
5.1 Appearance
5.1.1 The display components shall be complete, firmly assembled, stable in structure,
with smooth transitions at the edges and corners, and without defects such as burrs or
flash.
5.1.2 The enclosure and mounting connectors shall be free of obvious deformation,
dents, or other defects.
5.1.3 The color of the protective layer of the enclosure, including the control box and
connectors, shall be uniform, and the base shall be free of exposed scratches, cracks
and other defects.
6 Test method
6.1 Test conditions
6.1.1 Environmental conditions shall comply with the provisions of SJ/T 11281.
6.1.2 Test instrument shall comply with the provisions of SJ/T 11281.
6.2 Appearance
The appearance shall be inspected by visual inspection and manual touch.
6.3 Safety requirements
Safety requirements shall be tested in accordance with the provisions of SJ/T 11141.
6.4 Electromagnetic compatibility
6.4.1 Limits for harmonic current emissions shall be tested in accordance with GB
17625.1.
6.4.2 Limits for radio disturbance shall be tested in accordance with GB/T 9254.1, and
the test pattern procedure is shown in Appendix B.
6.5 Structure
6.5.1 The mass of the display module shall be tested using an electronic weighing
instrument.
6.5.2 Assembly accuracy shall be tested in accordance with the provisions of SJ/T
11281.
6.6 Degree of protection provided by enclosure
Degree of protection provided by enclosure shall be tested according to the
corresponding IP level in GB/T 4208.
6.7 Optical properties
6.7.1 Maximum luminance
Maximum luminance shall be tested in accordance with the provisions of SJ/T 11281.
6.7.2 Angle of view
Angle of view shall be tested in accordance with the provisions of SJ/T 11281.
6.7.3 Luminance non-uniformity
e) Use the same method to measure and calculate the three primary colors of red,
green and blue, respectively.
f) Take the maximum value as the luminance non-uniformity LJ of the display.
6.7.4 Dark screen non-uniformity
6.7.4.1 Test conditions
The test conditions are as follows.
a) The indoor ambient illumination is 200×(1±10%) lx;
b) The acquisition range of the test instrument shall not be less than 16 adjacent
pixels;
c) The test direction shall be the screen normal direction;
d) The test distance shall enable the test instrument to distinguish individual pixels
on the screen.
6.7.4.2 Test steps
Follow the steps below to test.
a) Use the test pattern program in Appendix C to set the image. The image diagram
is shown in Figure C.1.Make sure that the number of squares displayed on the
display screen is not less than 18, and each square is separated by a black border;
b) Adjust the square display state to the highest image density grade and highest
brightness level to display the white image;
c) Determine the positions of the 9 pairs of adjacent squares with the largest
deviations, and record;
d) Adjust the display to a completely dark state, and measure the luminance values
of the 9 pairs of adjacent squares;
e) Use Formula (1) to calculate the dark screen non-uniformity of each pair of
adjacent squares;
f) Take the maximum value as the dark screen non-uniformity LB of the display.
6.7.5 Chromaticity coordinates
6.7.5.1 Test conditions
The test conditions are as follows.
a) The change of ambient illumination shall be within ±10%, and there shall be no
obvious colored light source;
b) The acquisition range of the test instrument shall not be less than 16 adjacent
pixels;
c) The test direction shall be the screen normal direction;
d) The test distance shall enable the test instrument to distinguish individual pixels
on the screen.
6.7.5.2 Test steps
6.7.5.2.1 Perform the three primary colors chromaticity coordinate test as follows.
a) At the highest image density grade and the highest brightness level, the entire
screen displays red;
b) Read the chromaticity coordinates of the display module;
c) Determine whether its chromaticity coordinates are within the limits specified in
Table 4; consider it as qualified at the boundary points;
d) Use the same method to determine the qualification of the green and blue color
coordinates, respectively.
6.7.5.2.2 Perform the white image chromaticity coordinate test as follows.
a) At the highest image density and the maximum brightness, the full screen
displays white;
b) Adjust the specified color temperature to 6 500 K;
c) Read the chromaticity coordinates of the display module;
d) Determine the acceptability of the tolerance between the chromaticity
coordinates and the standard value.
6.7.6 Luminance identification level
Test in accordance with the provisions of SJ/T 11281.
6.7.7 Maximum contrast
Test in accordance with the provisions of SJ/T 11281.
6.8 Electrical characteristics
6.8.1 Image density grade
6.9 Low brightness characteristics
6.9.1 Test conditions
The test conditions shall comply with the relevant requirements of 6.7.3, 6.8.1 and 6.8.3.
6.9.2 Test steps
Follow the steps below to perform the measurement.
a) The display displays white image in full screen;
b) Adjust the brightness of the display, and take values within the brightness range
specified in Table 6;
Note. It is sufficient to take the value once, and there is no need to respectively take
the value for test in all brightness ranges in Table 6.
c) Perform luminance non-uniformity, image density grade, visual refresh ratio
tests in accordance with the relevant measurement steps in 6.7.3, 6.8.1, and 6.8.3;
d) Determine the acceptability of the low brightness characteristics at the selected
brightness value.
6.10 Environmental adaptability
6.10.1 Operating temperature
6.10.1.1 Test the low temperature according to GB/T 2423.1, which shall comply with
the provisions of 5.9.1.1.
6.10.1.2 Test the high temperature according to GB/T 2423.1, which shall comply with
the provisions of 5.9.1.2.
6.10.2 Damp heat load
Test according to GB/T 2423.3, which shall comply with the provisions of 5.9.2.
6.10.3 Vibrations
Test according to GB/T 2423.10, which shall comply with the provisions of 5.9.3.
6.10.4 Storage temperature
6.10.4.1 Test the low temperature according to GB/T 2423.1, which shall comply with
the provisions of 5.9.4.1.
6.10.4.2 Test the high temperature according to GB/T 2423.2, which shall comply with
the provisions of 5.9.4.2.
6.11 Energy conservation
Test according to the provisions of SJ/T 11141, which shall comply with the provisions
of 5.10.
7 Inspection rules
7.1 Inspection classification
The inspection of displays includes display module evaluation, display type inspection
and acceptance inspection.
7.2 Inspection batch grouping rules
Inspection batch grouping rules shall comply with the provisions of SJ/T 11141.
7.3 Display module evaluation
7.3.1 General
In any of the following situations, the display module used to assemble the display shall
be evaluated before assembling the display.
a) Before the first type inspection and acceptance inspection of the display;
b) Six months after the display is discontinued;
c) When there are major changes in the key components, circuit design, process,
structure and materials of the display;
d) When required by the contract.
7.3.2 Inspection items
The inspection items for display module evaluation shall comply with the requirements
of Table 7.
7.3.3 Sampling
Shall comply with the provisions of SJ/T 11141.
7.3.4 Sampling plan
Shall comply with the provisions of SJ/T 11141.
7.3.5 Failure
During the display module evaluation process, if one fatal defect or two or more non-
fatal defects occur, the display module evaluation inspection batch shall be judged as
an unqualified batch.
7.3.6 Re-submission
When the display module fails the evaluation and inspection, it is allowed to be
resubmitted once after repair or elimination of the unqualified products, and the
sampling plan and unqualified judgment criteria remain unchanged. If it still fails after
re-submission and evaluation, the batch of display modules shall not be used to
assemble displays.
7.4 Type inspection
7.4.1 General
Type inspection shall be carried out in any of the following cases.
a) Trial production and evaluation of new products or transfer of old products to
other factories for production;
b) After formal production, if there are major changes in structure, materials and
processes, which may affect product performance;
c) When the production, which is stopped for more than half a year, is resumed.
d) when the national quality supervision institutions propose a requirement.
7.4.2 Inspection items
The inspection items for type inspection shall comply with the requirements of Table 7.
7.4.3 Sampling
Shall comply with the provisions of SJ/T 11141.
7.4.4 Sampling plan
Shall comply with the provisions of SJ/T 11141.
7.4.5 Failure
During the type inspection process, if one fatal defect or two or more non-fatal defects
occur, the type inspection shall be judged as unqualified.
7.4.6 Re-submission
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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