SJ/T 11281-2025 (SJ/T 11281-2017) PDF English
US$545.00 · In stock · Download in 9 secondsSJ/T 11281-2017: Measure methods of light emitting diode (LED) displays Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid SJ/T 11281: Evolution and historical versions
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(Light-emitting diode (LED) display test method)
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Measure methods of light emitting diode (LED) displays
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| SJ/T 11281-2007 | English | 839 |
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[Replaced by SJ/T 11281-2017] Measure methods of light emitting diode (LED) panels
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| SJ/T 11281-2003 | English | 559 |
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[Replaced by SJ/T 11281-2017] Test methods of LED panels
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SJ/T 11281-2017: Measure methods of light emitting diode (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/SJT11281-2017
SJ
ELECTRONICS INDUSTRY STANDARD
ICS 31.120
L 47
Filing No..
Replacing SJ/T 11281-2007
Measure methods of light emitting diode (LED) displays
Issued on. NOVEMBER 07, 2017
Implemented on. JANUARY 01, 2018
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions, symbols... 5
4 General requirements... 5
5 Test method... 7
Appendix A (Normative) The slope of the constant dominant wavelength line of the
CIE 1931 chromaticity diagram standard illuminant E (equal energy light source)... 31
Appendix B (Normative) Supporting test software... 35
1 Scope
This standard specifies the test methods for the mechanical, optical, electrical and other
main technical performance parameters of light-emitting diode (LED) display.
This standard applies to the test of light-emitting diode (LED) display (hereinafter
referred to as display).
2 Normative references
GB 4208 Degrees of protection provided by enclosure (IP code)
SJ/T 11141-2017 Generic specification for LED displays
CIE 1931 Chromaticity diagram
3 Terms, definitions, symbols
The terms, definitions, symbols as established in SJ/T 11141-2017 apply to this standard.
4 General requirements
4.1 Test conditions
4.1.1 Atmospheric conditions
Unless otherwise specified, the test conditions are as follows.
4.1.2 Standard atmospheric conditions for arbitration test
Unless otherwise specified, the standard atmospheric conditions for arbitration test are
as follows.
4.1.3 Other environmental conditions
Unless otherwise specified, other environmental conditions shall comply with the
following provisions.
4.2 Test instruments and software
Unless otherwise specified, the performance of all test instruments shall meet the
specific requirements of the test.
5 Test method
5.1 Mechanical properties
5.1.1 Degree of protection of shell
Perform according to the method specified in GB 4208.
5.1.2 Assembly accuracy
5.1.2.1 Flatness
5.1.2.2 Relative deviation of pixel center distance
5.1.2.2.1 Purpose
Measure the center distance between any phase parts; calculate the phase error between
the measured center distance and the nominal value by formula.
5.1.2.2.2 Measurement principle
The measurement principle of the relative deviation of pixel center distance is shown
in Figures 3 and 4.
5.1.2.2.3 Measurement conditions
The display under test is disconnected from the power supply and is in a black screen
state.
5.2.1.3 Measurement conditions
The measurement conditions are as follows.
5.2.2.3 Measurement conditions
The measurement conditions are as follows
a) The ambient illumination change is less than ±10%; there is no obvious colored
light source;
b) The acquisition range of the color analyzer shall not be less than 16 adjacent pixels.
5.2.2.4 Measurement steps
5.2.2.4.1 Horizontal viewing angle
Measure as follows.
5.3.5 Pixel out-of-control rate
5.3.5.1 Purpose
Measure the out-of-control pixels on the display.
5.3.5.2 Measurement principle
Identify the out-of-control pixels on the display by visual inspection; calculate the pixel
out-of-control rate.
5.3.5.3 Measurement conditions
Drive the LED display normally.
5.3.5.4 Measurement steps
5.3.5.4.1 Entire screen pixel out-of-control rate
Measurement is performed as follows.
5.3.5.4.2 Regional pixel failure rate
Measure as follows.
a) Start the test software; select the pixel failure rate test function (see Appendix B);
set a 100 × 100 pixel movable red square (highest grayscale);
5.3.6 Automatic adjustment of display brightness
5.3.6.1 Purpose
Measure the ability of the display brightness to adjust as the ambient brightness changes.
5.3.6.2 Measurement principle
The automatic brightness adjustment function of the display is to sense the ambient
illumination through a photoelectric sensor and feed it back to the display controller for
brightness adjustment.
5.3.6.3 Measurement conditions
The measurement conditions are as follows.
5.3.6.4 Measurement steps
Perform the measurement as follows.
SJ/T 11281-2017
SJ
ELECTRONICS INDUSTRY STANDARD
ICS 31.120
L 47
Filing No..
Replacing SJ/T 11281-2007
Measure methods of light emitting diode (LED) displays
Issued on. NOVEMBER 07, 2017
Implemented on. JANUARY 01, 2018
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions, symbols... 5
4 General requirements... 5
5 Test method... 7
Appendix A (Normative) The slope of the constant dominant wavelength line of the
CIE 1931 chromaticity diagram standard illuminant E (equal energy light source)... 31
Appendix B (Normative) Supporting test software... 35
1 Scope
This standard specifies the test methods for the mechanical, optical, electrical and other
main technical performance parameters of light-emitting diode (LED) display.
This standard applies to the test of light-emitting diode (LED) display (hereinafter
referred to as display).
2 Normative references
GB 4208 Degrees of protection provided by enclosure (IP code)
SJ/T 11141-2017 Generic specification for LED displays
CIE 1931 Chromaticity diagram
3 Terms, definitions, symbols
The terms, definitions, symbols as established in SJ/T 11141-2017 apply to this standard.
4 General requirements
4.1 Test conditions
4.1.1 Atmospheric conditions
Unless otherwise specified, the test conditions are as follows.
4.1.2 Standard atmospheric conditions for arbitration test
Unless otherwise specified, the standard atmospheric conditions for arbitration test are
as follows.
4.1.3 Other environmental conditions
Unless otherwise specified, other environmental conditions shall comply with the
following provisions.
4.2 Test instruments and software
Unless otherwise specified, the performance of all test instruments shall meet the
specific requirements of the test.
5 Test method
5.1 Mechanical properties
5.1.1 Degree of protection of shell
Perform according to the method specified in GB 4208.
5.1.2 Assembly accuracy
5.1.2.1 Flatness
5.1.2.2 Relative deviation of pixel center distance
5.1.2.2.1 Purpose
Measure the center distance between any phase parts; calculate the phase error between
the measured center distance and the nominal value by formula.
5.1.2.2.2 Measurement principle
The measurement principle of the relative deviation of pixel center distance is shown
in Figures 3 and 4.
5.1.2.2.3 Measurement conditions
The display under test is disconnected from the power supply and is in a black screen
state.
5.2.1.3 Measurement conditions
The measurement conditions are as follows.
5.2.2.3 Measurement conditions
The measurement conditions are as follows
a) The ambient illumination change is less than ±10%; there is no obvious colored
light source;
b) The acquisition range of the color analyzer shall not be less than 16 adjacent pixels.
5.2.2.4 Measurement steps
5.2.2.4.1 Horizontal viewing angle
Measure as follows.
5.3.5 Pixel out-of-control rate
5.3.5.1 Purpose
Measure the out-of-control pixels on the display.
5.3.5.2 Measurement principle
Identify the out-of-control pixels on the display by visual inspection; calculate the pixel
out-of-control rate.
5.3.5.3 Measurement conditions
Drive the LED display normally.
5.3.5.4 Measurement steps
5.3.5.4.1 Entire screen pixel out-of-control rate
Measurement is performed as follows.
5.3.5.4.2 Regional pixel failure rate
Measure as follows.
a) Start the test software; select the pixel failure rate test function (see Appendix B);
set a 100 × 100 pixel movable red square (highest grayscale);
5.3.6 Automatic adjustment of display brightness
5.3.6.1 Purpose
Measure the ability of the display brightness to adjust as the ambient brightness changes.
5.3.6.2 Measurement principle
The automatic brightness adjustment function of the display is to sense the ambient
illumination through a photoelectric sensor and feed it back to the display controller for
brightness adjustment.
5.3.6.3 Measurement conditions
The measurement conditions are as follows.
5.3.6.4 Measurement steps
Perform the measurement as follows.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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