SJ/T 11982-2025 UHD LED Display System Specification

Standard Catalog

The standard consists of the following main sections:

• 1 Scope 1

• 2 Normative References 1

• 3 Terms and Definitions 1

• 4 Abbreviations 2

• 5 Basic Requirements 3

• 5.1 Normal Operating Conditions 3

• 5.2 Appearance and Structure 3

• 5.3 Functional Requirements 3

• 5.4 System Interfaces 4

• 5.5 Image Formats 4

• 5.6 Physical Performance 5

• 5.7 Display Performance 5

• 5.8 Protection Rating 6

• 5.9 Safety 6

• 5.10 Electromagnetic Compatibility 6

• 5.11 Environmental Adaptability 6

• 5.12 Reliability 6

• 5.13 Energy Efficiency 6

• 6 Test Conditions 6

• 6.1 Environmental Conditions 6

• 6.2 Test Preparation 7

• 6.3 Test Instruments 7

• 6.3.1 Signal Generator 7

• 6.3.2 Spectroradiometer 7

• 6.3.3 Illuminance Meter 7

• 6.3.4 Oscilloscope 7

• 6.3.5 Vernier Caliper 7

• 6.3.6 Angle Ruler 7

• 6.3.7 Feeler Gauge 7

• 6.3.8 Photoelectric Sensor 7

• 6.3.9 High-Speed Camera 7

• 6.3.10 AC Regulated Power Supply 7

• 6.4 Test Signals 8

• 6.4.1 Overview 8

• 6.4.2 Colour Bar Signal 8

• 6.4.3 Full White and Full Black Field Signals 9

• 6.4.4 Full Red, Full Green and Full Blue Field Signals 9

• 6.4.5 Chromaticity Viewing Angle Test Signal 10

• 6.4.6 Single Pixel Signal 10

• 6.5 Test Sample and Test Area 10

• 7 Test Methods 11

• 7.1 Appearance and Structure 11

• 7.2 Functional Check 11

• 7.2.1 Video Input 11

• 7.2.2 Brightness Adjustment 11

• 7.2.3 Colour Adjustment 11

• 7.2.4 Colour Temperature Adjustment 11

• 7.2.5 Signal Windowing 11

• 7.2.6 Signal Switching 11

• 7.2.7 HDR Support 12

• 7.2.8 Full-Screen Display 12

• 7.2.9 Full-Screen Roaming 12

• 7.2.10 Window Scaling 12

• 7.2.11 Window Overlay 12

• 7.2.12 Brightness Correction 12

• 7.2.13 Chromaticity Correction 12

• 7.2.14 Signal Preview and Playback 12

• 7.2.15 Scene Setting and Patrol 13

• 7.2.16 Built-in Background Image 13

• 7.2.17 Signal Redundancy Backup 13

• 7.2.18 System Visual Management 13

• 7.2.19 System Visual O&M 13

• 7.2.20 3D Display 13

• 7.3 Interface Check 13

• 7.4 Image Format Test 14

• 7.4.1 Test Signal 14

• 7.4.2 Test Procedure 14

• 7.5 Physical Performance Test 14

• 7.5.1 Flatness 14

• 7.5.2 Pixel Centre Pitch Relative Deviation 14

• 7.5.3 Horizontal Misalignment 14

• 7.5.4 Vertical Misalignment 14

• 7.6 Display Performance Test 15

• 7.6.1 Physical Resolution 15

• 7.6.2 Maximum Luminance 15

• 7.6.3 Viewing Angle 16

• 7.6.4 Chromaticity Viewing Angle 16

• 7.6.5 Contrast Ratio 16

• 7.6.6 Luminance Uniformity 16

• 7.6.7 Chromaticity Non-Uniformity 17

• 7.6.8 Colour Gamut Coverage (BT.2020) 17

• 7.6.9 Frame Rate 18

• 7.6.10 Refresh Rate 18

• 7.6.11 Signal Processing Bits 18

• 7.6.12 Supported Signal Input 18

• 7.6.13 Chromaticity Coordinate Deviation 19

• 7.6.14 Pixel Out-of-Control Rate 19

• 7.6.15 Black Screen Non-Uniformity 20

• 7.6.16 EOTF Curve Fitting Degree 20

• 7.6.17 Colour Temperature 20

• 7.6.18 Signal Source Transmission Delay 21

• 7.6.19 Signal Source Switching Delay 21

• 7.6.20 Scene Switching Delay 21

• 7.7 Protection Rating 22

• 7.8 Safety 22

• 7.9 Electromagnetic Compatibility 22

• 7.9.1 Radio Disturbance 22

• 7.9.2 Harmonic Current 22

• 7.9.3 Immunity 22

• 7.10 Environmental Adaptability 22