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SJ/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 procedure Status: Valid SJ/T 11281: Historical versions
Similar standardsSJ/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/SJT11281-2017SJ 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 ContentsForeword... 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... 351 ScopeThis 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 referencesGB 4208 Degrees of protection provided by enclosure (IP code) SJ/T 11141-2017 Generic specification for LED displays CIE 1931 Chromaticity diagram3 Terms, definitions, symbolsThe terms, definitions, symbols as established in SJ/T 11141-2017 apply to this standard.4 General requirements4.1 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 method5.1 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 PRCTable of ContentsForeword... 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... 351 ScopeThis 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 referencesGB 4208 Degrees of protection provided by enclosure (IP code) SJ/T 11141-2017 Generic specification for LED displays CIE 1931 Chromaticity diagram3 Terms, definitions, symbolsThe terms, definitions, symbols as established in SJ/T 11141-2017 apply to this standard.4 General requirements4.1 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 method5.1 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. |
