SJ/T 11281-2025 LED Display Test Methods

Standard Catalog

The standard consists of the following main sections:

• 1 Scope 1

• 2 Normative References 1

• 3 Terms and Definitions 1

• 4 General Requirements 1

• 4.1 Test Conditions 1

• 4.2 Test Instruments and Software 2

• 4.3 Test Signals 2

• 5 Test Methods 7

• 5.1 Mechanical Performance 7

• 5.1.1 Enclosure Protection Rating 7

• 5.1.2 Assembly Precision 7

• 5.1.2.1 Flatness 7

• 5.1.2.2 Pixel Center Pitch Relative Deviation 7

• 5.1.2.3 Horizontal Relative Misalignment 8

• 5.1.2.4 Vertical Relative Misalignment 8

• 5.2 Optical Performance 10

• 5.2.1 Maximum Luminance 10

• 5.2.2 Viewing Angle 11

• 5.2.3 Maximum Contrast Ratio 11

• 5.2.4 Intra-Frame Contrast 12

• 5.2.5 Primary Colour Dominant Wavelength Error 12

• 5.2.6 White-Field Chromaticity Coordinates 13

• 5.2.7 Luminance Discrimination Levels 14

• 5.2.8 Uniformity 14

• 5.2.8.1 Pixel Intensity Non-Uniformity 14

• 5.2.8.2 Display Module Luminance Non-Uniformity 15

• 5.2.8.3 Display Assembly Luminance Non-Uniformity 15

• 5.2.8.4 Primary Colour Chromaticity Non-Uniformity 16

• 5.2.8.5 White-Field Chromaticity Non-Uniformity 16

• 5.2.8.6 Black-Screen Non-Uniformity 17

• 5.2.9 Colour Gamut Coverage 17

• 5.2.10 Colour Reproduction 18

• 5.3 Electrical Performance 21

• 5.3.1 Grey Levels 21

• 5.3.2 Frame Rate 22

• 5.3.3 Visual Refresh Rate 23

• 5.3.4 Signal Processing Depth 24

• 5.3.5 Pixel Out-of-Control Rate 25

• 5.3.6 Automatic Brightness Adjustment 26

• 5.3.7 Maximum Power 26

• 5.3.8 Average Power 27

• 5.4 Working Noise Level 27

• Appendix A (Normative) Slopes of Constant Dominant Wavelength Lines for CIE 1931 Chromaticity Diagram Standard Illuminant E 28

• Appendix B (Informative) Supporting Test Software Description 31

• B.1 Overview 31

• B.2 Software Features 31

• B.3 Functions 31