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GB/T 20871.62-2025Organic light emitting diode displays - Part 6-2: Test methods - Visual quality and ambient performance (English PDF)

有机发光二极管显示器件第6-2部分：测试方法视觉质量和亮室性能

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 20871.62-2025 is the English-translated version of 有机发光二极管显示器件第6-2部分：测试方法视觉质量和亮室性能.

GB/T 20871.62-2025 — 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.

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Document preview — GB/T 20871.62-2025

National Standard of the People's Republic of China

ICS: 31.120
Classification: L 53

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and Definitions
3.2 Abbreviations
4 Test equipment
5 Standard test conditions
5.1 Standard test environment conditions
5.2 Standard lighting conditions
5.3 Standard installation conditions
6 Visual inspection of static images
6.1 General
6.2 Classification of visual defects
6.3 Visual inspection methods and standards
7 Photoelectric test methods in bright room environment
7.1 Reflection characteristics test
7.2 Bright room contrast
7.3 Bright Room Color
7.4 Bright Room Chromaticity Space
Appendix A (Informative) Relative photoluminescence of test display screens
A.1 Purpose
A.2 Test conditions
A.3 Testing the dual-spectrum photoluminescence of the display
A.4 Determination of the relative photoluminescence of a display screen
Appendix B (Informative) Diagnosis of the relationship between ambient light intensity and observed display brightness
B.1 Purpose
B.2 Test method
Appendix C (Informative) Calculation method of bright room color gamut space
C.1 Purpose
C.2 Procedure for calculating the color gamut space
C.3 Surface decomposition method for CIELAB color gamut volume calculation
Reference
Figure 1 Example of a visual inspection room setup to control ambient and reflected light
Figure 2 Example of geometric relationship between the integrating sphere and the sampling sphere for uniform hemispherical diffuse illumination test
Figure 3 Geometric relationship for directional lighting test using independent light sources
Figure 4 Geometry of directional lighting test using ring light
Figure 5 Test device configuration diagram
Figure 6 Classification of visual impairments 11
Figure 7 Bright sub-pixel defect
Figure 8 Classification criteria for bright and dark pixel defects 12
Figure 9 Bright line and dark line defects
Figure 10 Line moiré example
Figure 11 Example of moire pattern
Figure 12 Installation conditions for photoelectric visual defect inspection
Figure 13 Scratch and dent defect shapes
Figure 14 Example of the range of colors produced by a given display represented in the CIELAB color space
Figure A.1 Dual-spectrum photoluminescence response of display screen
Figure A.2 Decomposed dual-spectrum photoluminescence response of the display
Figure B.1 Example of a high-intensity LED flashlight shining on the display surface to generate high illumination, resulting in reduced display brightness
Figure C.1 Analysis flow chart for calculating color gamut value
Figure C.2 Example of the color gamut of sRGB in the CIELAB color space
Table 1 Definition of scratch and dent defect types 16
Table 2 Characteristic values M1 and M2 of CIE daylight illuminants D50 and D75
Table 3 Example of minimum colors required for color gamut calculation of three-primary color 8-bit display
Table 4 Tristimulus values measured for the minimum colors required for color gamut space calculation under specified bright room lighting conditions
Table 5 White point calculated under dark room and bright room conditions
Table 6 Color gamut in CIELAB color space
Table C.1 Tristimulus values of sRGB primary colors
Table C.2 Example of sRGB color group in CIELAB color space
Table C.3 Example of sRGB color gamut space in CIELAB color space

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".

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.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60050 · IEC 61966 · IEC 62341

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