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GB/T 20871.62-2025: Organic light emitting diode displays - Part 6-2: Test methods - Visual quality and ambient performance
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Organic light emitting diode displays - Part 6-2: Test methods - Visual quality and ambient performance
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GB/T 20871.62-2025
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Basic data | Standard ID | GB/T 20871.62-2025 (GB/T20871.62-2025) | | Description (Translated English) | Organic light emitting diode displays - Part 6-2: Test methods - Visual quality and ambient performance | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L53 | | Classification of International Standard | 31.120 | | Word Count Estimation | 42,454 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20871.62-2025: Organic light emitting diode displays - Part 6-2: Test methods - Visual quality and ambient performance
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ICS 31.120
CCSL53
National Standard of the People's Republic of China
Organic light emitting diode display devices
Part 6-2.Test methods
Visual Quality and Bright Room Performance
Released on 2025-05-30
2025-12-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms, definitions and abbreviations 1
3.1 Terms and Definitions 1
3.2 Abbreviations 3
4 Test equipment 4
5 Standard test conditions 4
5.1 Standard test environment conditions 4
5.2 Standard lighting conditions 4
5.3 Standard installation conditions 9
6 Visual inspection of static images 10
6.1 General 10
6.2 Classification of visual defects 10
6.3 Visual inspection methods and standards 13
7 Photoelectric test methods in bright room environment 17
7.1 Reflection characteristics test 17
7.2 Bright room contrast 20
7.3 Bright Room Color 21
7.4 Bright Room Chromaticity Space 21
Appendix A (Informative) Relative photoluminescence of test display screens 25
A.1 Purpose 25
A.2 Test conditions 25
A.3 Testing the dual-spectrum photoluminescence of the display 25
A.4 Determination of the relative photoluminescence of a display screen 25
Appendix B (Informative) Diagnosis of the relationship between ambient light intensity and observed display brightness 27
B.1 Purpose 27
B.2 Test method 27
Appendix C (Informative) Calculation method of bright room color gamut space 28
C.1 Purpose 28
C.2 Procedure for calculating the color gamut space 28
C.3 Surface decomposition method for CIELAB color gamut volume calculation 30
Reference 35
Figure 1 Example of a visual inspection room setup to control ambient and reflected light 5
Figure 2 Example of geometric relationship between the integrating sphere and the sampling sphere for uniform hemispherical diffuse illumination test 7
Figure 3 Geometric relationship for directional lighting test using independent light sources 8
Figure 4 Geometry of directional lighting test using ring light 9
Figure 5 Test device configuration diagram 10
Figure 6 Classification of visual impairments11
Figure 7 Bright sub-pixel defect 11
Figure 8 Classification criteria for bright and dark pixel defects12
Figure 9 Bright line and dark line defects 12
Figure 10 Line moiré example 13
Figure 11 Example of moire pattern 13
Figure 12 Installation conditions for photoelectric visual defect inspection 15
Figure 13 Scratch and dent defect shapes 17
Figure 14 Example of the range of colors produced by a given display represented in the CIELAB color space 23
Figure A.1 Dual-spectrum photoluminescence response of display screen 26
Figure A.2 Decomposed dual-spectrum photoluminescence response of the display 26
Figure B.1 Example of a high-intensity LED flashlight shining on the display surface to generate high illumination, resulting in reduced display brightness 27
Figure C.1 Analysis flow chart for calculating color gamut value 28
Figure C.2 Example of the color gamut of sRGB in the CIELAB color space 29
Table 1 Definition of scratch and dent defect types16
Table 2 Characteristic values M1 and M2 of CIE daylight illuminants D50 and D75 18
Table 3 Example of minimum colors required for color gamut calculation of three-primary color 8-bit display 22
Table 4 Tristimulus values measured for the minimum colors required for color gamut space calculation under specified bright room lighting conditions 23
Table 5 White point calculated under dark room and bright room conditions 24
Table 6 Color gamut in CIELAB color space 24
Table C.1 Tristimulus values of sRGB primary colors 28
Table C.2 Example of sRGB color group in CIELAB color space 29
Table C.3 Example of sRGB color gamut space in CIELAB color space 30
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 6-2 of GB/T 20871 Organic Light Emitting Diode Display Devices. GB/T 20871 has been published for the following
part.
--- Part 1-2.Terminology and text symbols;
--- Part 6-1.Test methods for optical and optoelectronic parameters;
--- Part 6-2.Test methods for visual quality and bright room performance;
--- Part 6-3.Image quality test methods.
This document is equivalent to IEC 62341-6-2.2015 "Organic light emitting diode (OLED) display devices Part 6-2.Visual quality
Test Methods for Light Room and Bright Room Performance.
The following minimal editorial changes were made to this document.
---Change the standard name to "Organic Light Emitting Diode Display Devices Part 6-2.Test Methods for Visual Quality and Bright Room
performance".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This document is under the jurisdiction of the National Technical Committee for Standardization of Electronic Display Devices (SAC/TC547).
This document was drafted by. Zhejiang Sanse Optoelectronics Technology Co., Ltd., Hangzhou Santai Testing Technology Co., Ltd., Xiamen Metrology Verification and Testing
Institute of Electronics Standardization, Leyard Optoelectronics Co., Ltd., Hefei Visionox Technology Co., Ltd., China Institute of Metrology
Research Institute, Zhejiang Youshengkang Technology Co., Ltd., and Tianma Microelectronics Co., Ltd.
The main drafters of this document are. Mou Xi, Mou Tongsheng, Jiang Shulian, Bai Jianjun, Liu Li, Zheng Peng, Zhang Yuqin, Sun Zhehui, Tang Xin, Wang Feixia, Chen Chi,
Zhou Haiqin, Li Junkai, and Wang Xinyue.
Introduction
GB/T 20871 “Organic light-emitting diode display devices” is intended to consist of the following parts.
--- Part 1-1.General specification. The purpose is to specify the general requirements for organic light emitting diode display devices.
--- Part 1-2.Terminology and text symbols. The purpose is to define the preferred terms, definitions and text symbols for organic light emitting diode displays.
Character number.
--- Part 2.Basic ratings and characteristics. The purpose is to specify the basic ratings and characteristics of organic light emitting diode display modules.
--- Part 3.Display screen sub-specification. The purpose is to provide the quality assessment procedures and inspection requirements required for evaluating organic light emitting diode displays.
requirements, screening sequences, sampling requirements, tests and test methods.
--- Part 4.Display module section specification. The purpose is to specify the quality assessment procedures required for organic light emitting diode display modules, including
Inspection requirements, screening sequences, sampling requirements, tests and test methods.
--- Part 4-1.Detailed specification of display module for under-screen camera. The purpose is to specify the technical specifications of display module for under-screen camera.
Terms and definitions, requirements, quality assessment procedures, and testing procedures.
--- Part 5-1.Environmental test methods. The purpose is to provide the evaluation of organic light emitting diode display modules under specified environmental conditions.
Test methods for adaptability to working and storage environments.
--- Part 5-2.Mechanical test methods. The purpose is to specify the mechanical durability and
Test methods for packaging for transport.
--- Part 5-3.Test methods for afterimage and life. The purpose is to specify the afterimage of organic light emitting diode displays and display modules
Standard test conditions and test methods for durability and life.
--- Part 6-1.Test methods for optical and optoelectronic parameters. The purpose is to specify the optical properties of organic light emitting diode displays and display modules.
Standard measurement conditions and standard measurement methods for scientific parameters.
--- Part 6-2.Test methods for visual quality and bright room performance. The purpose is to specify the organic light emitting diode display screen and display module
Standard test conditions and test methods for visual quality and bright room performance of electrical components.
--- Part 6-3.Image quality test method. The purpose is to specify the image quality of organic light emitting diode displays and display modules
Standard test conditions and test methods.
Organic light emitting diode display devices
Part 6-2.Test methods
Visual Quality and Bright Room Performance
1 Scope
This document specifies standard test conditions for the visual quality and bright room performance of organic light emitting diode (OLED) display modules and displays.
and testing methods.
This document is mainly applicable to color display modules.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
(IEV)-Part 845.Lighting]
Note. GB/T 2900.65-2023 Electrical terminology lighting (IEC 60050-845.2020, IDT)
IEC 61966-2-1 Color testing and management for multimedia systems and devices Part 2-1.Color management default RGB color space
Colourmanagement-DefaultRGB colorspace-sRGB)
IEC 62341-1-2 Organic light emitting diode (OLED) displays Part 1-2.Terms and text symbols [Organiclight
Note. GB/T 20871.12-2024 Organic light-emitting diode display devices Part 1-2.Terminology and text symbols (IEC 62341-1-2.2014, IDT)
CIE15.2004 Colorimetry
3 Terms, definitions and abbreviations
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions defined in IEC 60050-845 and IEC 62341-1-2 and the following apply.
3.1.1
Visual inspection
A method of inspecting image quality by observing the test sample with human eyes and comparing it with the standard sample.
3.1.2
Subpixel defects
The full or partial brightness of a single sub-pixel (the smallest unit of color) is significantly brighter or darker than the surrounding sub-pixels of the same color.
Note 1.Further classification of sub-pixel defects depends on the number and composition of multiple sub-pixel defects in a display area.
NOTE 2 For monochrome displays, the term “point defect” may be used.
3.1.3
A defect in which a sub-pixel or dot is significantly brighter than surrounding sub-pixels of the same color when driven by a uniformly dark or gray background signal.
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