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GB/T 38001.51-2024Flexible display devices - Part 5-1: Measuring methods of optical performance (English PDF)

柔性显示器件第5-1部分：光学性能测试方法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 25, 2024

Implementation date

August 1, 2024

Scope

GB/T 38001.51-2024 is the English-translated version of 柔性显示器件第5-1部分：光学性能测试方法.

GB/T 38001.51-2024 — This document describes the standard test conditions and test methods for the optical performance of flexible display devices under darkroom and ambient light conditions: This document is mainly applicable to displays where a single monochrome or color display device with a single curvature radius of 35mm or more is bent around a single axis Parts are tested in a static mechanical state:

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Document preview — GB/T 38001.51-2024

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 and definitions, abbreviations
3.1 Terms and Definitions
3.2 Abbreviations
4 Test equipment structure
4.1 Test Configuration - Display Device Fixture
4.2 Optical test equipment
4.3 Light source configuration
5 Standard test conditions
5.1 Standard test atmospheric conditions
5.2 Standard lighting conditions
5.3 Standard setting conditions
5.4 Standard measurement position
6 Darkroom optical test method
6.1 Brightness and Brightness Uniformity
6.2 Contrast
6.3 Chromaticity, Color Uniformity, and Color Gamut
6.4 Full white color temperature
6.5 Viewing angle characteristics
6.6 Bending State Crosstalk
7 Bright Room Environment Optical Test Method
7.1 Reflection characteristics test
7.2 Bright Room Contrast
7.3 Bright Room Color
7.4 Bright Room Color Space
Appendix A (Informative) Bright Room Color Gamut Calculation Method
A:1 Purpose
A:2 Procedure for calculating color gamut values
A:3 Surface decomposition method for CIELAB color gamut calculation
Reference
Figure 1 Example of a coordinate system for a convex display device with a fixed radius of curvature on the y-axis
Figure 2 Example of a top view of a convex display device rotating within a measurement field
Figure 3 shows an example of a top view of a device mounted and rotated in the xz plane:
Figure 4 Optical characteristics of point-of-sight photometer, colorimeter, and spectroradiometer
Figure 5 Example of the relationship between the measurement field diameter and the tilt angle
Figure 6 Example of test structure for integrating sphere lighting
Figure 7 Example of directional light source illuminating a convex display device
Figure 8 Example of a ring light source illuminating a convex display device
Figure 9 Standard test position
Figure 10 Window brightness
Figure 11 Examples of color gamut representation in two commonly used chromaticity diagrams
Figure 12 Example of contrast viewing angle characteristics
Figure 13 Crosstalk pattern of 4% white windows arranged diagonally on a gray background
Figure 14 Crosstalk pattern of 4% black windows arranged diagonally on a gray background
Figure 15 Crosstalk pattern of 4% white windows arranged vertically on a gray background
Figure 16 Crosstalk pattern of 4% black windows arranged vertically on a gray background
Figure 17 Example of display device color range
Figure A:1 Analysis flow chart for calculating color gamut space
Figure A:2 The color gamut of sRGB in the CIELAB color space
Table 1 Input signals for CIELAB, CIE1931 and CIE1976 UCS color gamut tests
Table 2 CIE1976UCS chromaticity non-uniformity example
Table 3 Example of viewing angle characteristic report format
Table 4 Characteristic values of M1 and M2 for daylight illumination bodies D50 and D75
Table 5 Minimum color example required for color gamut calculation of three-primary color 8-bit display
Table 6 Measured tristimulus values for minimum color setting
Table 7 White point calculated under dark room and bright room illumination conditions
Table 8 Gamut volume in CIELAB color space
Table A:1 Tristimulus values for sRGB primary colors
Table A:2 Example of sRGB color setting in CIELAB color space
Table A:3 Example of sRGB color gamut 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 5-1 of GB/T 38001 Flexible Display Devices: GB/T 38001 has been published in the following parts:

--- Part 1-1: Terminology and text symbols;

--- Part 5-1: Test methods for optical properties;

--- Part 5-2: Test methods for optical performance of non-portable curved display devices;

--- Part 5-3: Visual evaluation method;

--- Part 6-1: Mechanical stress test methods;

--- Part 6-2: Environmental test methods:

The following minimal editorial changes were made to this document:

--- "6:1:5 Definition and evaluation of brightness uniformity" is changed to "6:1:5 Calculation of brightness uniformity";

--- "6:2:4 Definition and evaluation" is modified to "6:2:4 Contrast calculation";

---"6:5:4 Definition and evaluation" is changed to "6:5:4 View angle calculation":

This document is equivalent to IEC 62715-5-1:2017 "Flexible display devices Part 5-1: Optical performance test methods":

Introduction

The new display industry is a strategic, basic and leading industry for national economic and social development: Flexible display devices are new display Flexible display is one of the important development directions of the industry: Due to its bendability, lightness and thinness, its market share is increasing:

The production, manufacturing, inspection and import and export trade needs of device products are to formulate a series of standards for flexible display devices: The Flexible Display Devices are proposed to be Partial composition:

--- Part 1-1: Terms and text symbols: The purpose is to define the terms, definitions and text symbols preferred for flexible display devices:

--- Part 1-2: General specification: The purpose is to specify the classification, technical requirements, inspection methods, inspection rules, and Marking, packaging, transportation and storage requirements:

--- Part 2: Ratings and characteristics: The purpose is to specify the basic ratings and characteristics requirements of flexible display devices:

--- Part 3-1: Detailed specification for side-bent flexible display modules: The purpose is to specify the terms and definitions of side-bent flexible display modules, Classification, technical requirements, inspection methods, inspection rules, as well as marking, packaging, transportation and storage requirements:

--- Part 3-2: Detailed specification for external folding flexible display module: The purpose is to define the terminology and Definition, classification, technical requirements, inspection methods, inspection rules, as well as marking, packaging, transportation and storage requirements:

--- Part 3-3: Detailed specification for inner folding flexible display module: The purpose is to specify the terminology and Definition, classification, technical requirements, inspection methods, inspection rules, as well as marking, packaging, transportation and storage requirements:

--- Part 3-4: Detailed specification for rolled flexible display module: The purpose is to specify the terms and definitions, technical Requirements, inspection methods, inspection rules, as well as marking, packaging, transportation and storage requirements:

--- Part 4-1: Detailed specification for wearable flexible display modules: The purpose is to define the terminology and Definitions, requirements, inspection rules, inspection methods, and packaging, transportation and storage requirements:

--- Part 5-1: Optical performance test method: The purpose is to specify the optical properties of flexible display devices under dark room and ambient light conditions:

Standard test conditions and test methods for performance:

--- Part 5-2: Test methods for optical performance of non-portable curved display devices: The purpose is to specify non-portable curved display devices Standard test conditions and test methods for optical properties under darkroom conditions:

--- Part 5-3: Visual evaluation method: The purpose is to specify the overall framework and operating procedures for the visual evaluation of flexible display devices:

--- Part 5-10: Stretchable optical performance test specification: The purpose is to specify the stretchable flexible display device under darkroom conditions:

Standard test conditions and test methods for optical properties:

--- Part 6-1: Mechanical stress test method: The purpose is to specify the mechanical stress test method for evaluating flexible display modules:

--- Part 6-2: Environmental test methods: The purpose is to specify the performance of flexible display devices under specified conditions of use, storage and transportation:

Test methods for environmental adaptability:

--- Part 6-3: Mechanical test methods Impact and hardness test: The purpose is to specify the standard for the mechanical reliability of flexible display devices Test methods, especially for the mechanical reliability of flexible display devices subjected to external forces, impact and hardness:

Flexible display devices Part 5-1: Test methods for optical properties

1 Scope

This document describes the standard test conditions and test methods for the optical performance of flexible display devices under darkroom and ambient light conditions:

This document is mainly applicable to displays where a single monochrome or color display device with a single curvature radius of 35mm or more is bent around a single axis Parts are tested in a static mechanical state:

2 Normative references

The contents of the following documents constitute the 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:

IEC 61966-2-1 Color measurement and management for multimedia systems and devices Part 2-1: Color management default RGB color space Colourmanagement-DefaultRGB colourspace-sRGB ) IEC 62341-6-2 Organic light emitting diode display devices Part 6-2: Test methods for visual quality and environmental characteristics [Organic performance] Note: GB/T 43789.31-2024 Electronic paper display devices Part 3-1: Optical performance test methods (IEC 62679-3-1:2014, IDT) Note: GB/T 38001.11-2020 Flexible display devices Part 1-1: Terminology and text symbols (IEC 62715-1-1:2013, 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 62715-1-1 and IEC TR62728 apply:

3.2 Abbreviations

CIELAB: CIE1976 (L*a*b*) color space

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 37 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 61966 · IEC 62341 · IEC 62679 · IEC 62715

Cited by

GB/T 38001.52-2024Flexible display devices - Part 5-2: Measuring methods of optical characteristics for non portable curved displays

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