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SJ/T 11460.6.4-2023 PDF English

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SJ/T 11460.6.4-2023: Display lighting unit - Part 6-4: Measuring methods of optoelectrical parameters of LED light board
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SJ/T 11460.6.4-2023: Display lighting unit - Part 6-4: Measuring methods of optoelectrical parameters of LED light board


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SJ ELECTRONICS INDUSTRY STANDARD ICS 31.120 CCS L 53 Display lighting unit - Part 6-4.Measuring methods of optoelectrical parameters of LED light board Issued on: AUGUST 16, 2023 Implemented on: NOVEMBER 01, 2023 Issued by. Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword... 3 Introduction... 5 1 Scope... 7 2 Normative references... 7 3 Terms, definitions, abbreviations... 7 3.1 Terms and definitions... 7 3.2 Abbreviations... 8 4 Test system... 8 4.1 Overview... 8 4.2 Light measurement equipment... 9 4.3 Test platform... 10 5 Test conditions... 10 5.1 Standard atmospheric conditions... 10 5.2 Power drive conditions... 10 5.3 Preheating... 10 5.4 Darkroom conditions... 10 5.5 Thermal performance conditions... 10 5.6 Mechanical alignment mark... 11 6 Test method... 11 6.1 Electrical parameters... 11 6.2 Brightness and brightness uniformity... 13 6.3 Chromaticity... 15 6.4 Peak wavelength... 16 6.5 LED light diffusion brightness distribution... 17 7 Test result report... 19 References... 20 Display lighting unit - Part 6-4.Measuring methods of optoelectrical parameters of LED light board

1 Scope

This document describes the test methods and standard measurement conditions for the optoelectronic parameters of LED light boards used for LED backlights in display lighting units.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. SJ/T 11460.6.1-2015 Backlight unit for liquid crystal display - Part 6-1.Measuring method of optical and optoelectrical parameters ISO/CIE 11664-5 Colorimetry - Part 5.CIE 1976 L*u*v* color space and u', v' uniform chromaticity scale diagram IEC 62595-1-2 Display lighting unit - Part 1-2.Terminology and letter symbol

3 Terms, definitions, abbreviations

3.1 Terms and definitions The terms and definitions defined in IEC 62595-1-2.2016, as well as the following terms and definitions, apply to this document. 3.1.1 LED light board A circuit board with multiple LEDs distributed in two dimensions, used to produce uniform planar light distribution, mainly for direct-type backlight components. 3.1.2 4.3 Test platform A two-dimensional mobile test platform shall be used. The operating range shall not be less than the effective luminous size of the LED light board. The positioning accuracy of the test platform shall be able to meet the requirements of data repeatability.

5 Test conditions

5.1 Standard atmospheric conditions The test and test environmental conditions are as follows. a) Temperature. 22 °C ~ 28 °C; b) Relative humidity. 25% ~ 85%; c) Air pressure. 86 kPa ~ 106 kPa. When the test environmental conditions are inconsistent with the requirements of this document, it shall be noted in the test report. 5.2 Power drive conditions When measuring the photoelectric parameters of the LED light board, the drive and control devices of the LED light board shall be set according to the requirements of the product specification. 5.3 Preheating Preheating shall comply with the provisions of 4.3 of SJ/T 11460.6.1-2015. 5.4 Darkroom conditions The ambient illumination shall not exceed 1 lx. When the test environmental conditions are inconsistent with the requirements of this document, it shall be noted in the test report. 5.5 Thermal performance conditions A heat sink shall be used when testing LED light board, to ensure that the heat The following contents shall be recorded in the test report. - The total voltage V, total current I, total power consumption P of the LED light board; - The voltage value V(i,j), current value I(i,j), power consumption value P(i,j) of each block of the LED light board; - The maximum voltage value VM and the minimum voltage value Vm between each block of the LED light board; - The maximum current value IM and the minimum current value Im between each block of the LED light board; - The maximum power consumption value PM and the minimum power consumption value Pm between each block of the LED light board; - The maximum voltage difference ΔVM, the maximum current difference ΔIM, the maximum power consumption difference ΔPM between each block of the LED light board; - The voltage difference ΔV(i,j), current difference ΔI(i,j), power consumption difference ΔP(i,j) of each block of the LED light board and the standard value. 6.2 Brightness and brightness uniformity 6.2.1 Purpose Measure the brightness and brightness uniformity of the LED light board. 6.2.2 Test conditions The following test conditions shall be used. a) Test device. 1) Color luminance meter and test installation platform; 2) Power supply; b) Test environment conditions. Darkroom conditions. 6.2.3 Test method The test method is carried out in accordance with the following provisions. a) Install the LED light board under test as shown in Figure 1; adjust the LMD to keep it perpendicular to the LED light board under test; 6.3 Chromaticity 6.3.1 Purpose Measure the chromaticity coordinates and chromaticity non-uniformity of LED light board. 6.3.2 Test conditions The test conditions shall meet the requirements of 6.2.2. 6.3.3 Test method The test method is carried out in accordance with the following provisions. a) Install the LED light board under test as shown in Figure 1; adjust the LMD to keep it perpendicular to the LED light board under test; b) Set the driving current and voltage according to the requirements of the product specification; c) According to the position of the brightness test in 6.2.3, test and obtain the CIE 1931 chromaticity coordinates (xi, yi) of the midpoint Pi in Figure 3; calculate the average value (xa, ya); d) Calculate the CIE 1976 UCS chromaticity coordinates (u'i, v'i) (see ISO/CIE 11664-5) of the midpoint Pi in Figure 3; calculate the average value (u'a, v'a); e) Calculate the mean square error of the chromaticity coordinates of the LED light board according to formula (8). f) Calculate the chromaticity non-uniformity NUc of the LED light board according to formula (9). g) If necessary, calculate the correlated color temperature (CCT) of the tested LED light board. 6.3.4 Test report The following contents shall be recorded in the test report. - Chromaticity coordinates (xi, yi) and (u'i, v'i) of each test point of the LED light board; - Chromaticity coordinates (xa, ya) and (u'a, v'a) of the LED light board; - Color difference Δ𝑢'𝑣'i of each test point of the LED light board; - Chromaticity non-uniformity NUc of the LED light board. 6.4 Peak wavelength 6.4.1 Purpose Measure the peak wavelength and half-peak width of the LED light board in the required wavelength range. 6.4.2 Standard test conditions The following test conditions shall be used. a) Test equipment. 1) Spectroradiometer and test installation platform; 2) Power supply; b) Test environment conditions. Darkroom conditions. 6.4.3 Test method The test method shall be carried out in accordance with the following provisions. a) Install the LED light board to be tested as shown in Figure 1 (without installing the diffusion plate); align the spectroradiometer with the center of the LED light board; measure the relative spectral radiation power distribution of the LED light board to be tested within the required spectral range; b) According to the measured relative spectral radiation power distribution, obtain the peak wavelength λp within the required wavelength range; c) Select the wavelengths corresponding to the relative spectral radiation power being half of the peak value on both sides of the peak wavelength λp, as λ1 and λ2, the difference between the two is the half-peak width Δλ of the peak wavelength λp. 6.4.4 Test report The following contents shall be recorded in the test report. - Relative spectral radiant power distribution of the LED light board; ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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