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GB/T 38001.53-2024Flexible display devices - Part 5-3: Visual assessment of image quality and defects (English PDF)

柔性显示器件第5-3部分：目视评价方法

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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 38001.53-2024 is the English-translated version of 柔性显示器件第5-3部分：目视评价方法.

GB/T 38001.53-2024 — This document specifies the overall framework and operating procedures for the visual evaluation of flexible display devices: This document applies to the visual evaluation methods of flexible display devices in the following states: ---Initial state and aging state under standard environmental conditions; ---State under mechanical or environmental stress conditions; --- State after mechanical durability test, state after environmental durability test, state after mechanical and environmental combined durability test: NOTE Visual assessment of mechanical or environmental stress is often difficult to perform and this method should be used if applicable: Visual evaluation is accomplished by comparison of the test sample with a limit sample or a set of graded samples: This document provides limit samples: The framework and procedures to be followed in the preparation of limit samples and a set of graded samples are described: It also specifies the visual evaluation methods for different types of defects of limit samples and grade samples:

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Document preview — GB/T 38001.53-2024

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
4 Visual evaluation procedure
4.1 Overview
4.2 Display settings and driving conditions
4.3 Visual evaluation observer
4.4 Environmental conditions for visual assessment
4.5 Observation geometry
5 Test pattern (test signal)
5.1 Overview
5.2 Full Screen Pattern
5.3 Periodic Patterns
5.4 Tone and Color Gradient Patterns
5.5 Crosstalk Test Figure
5.6 Electro-optical defect test pattern
5.7 Static Resolution Test Pattern
5.8 Natural and synthetic patterns
6 Visual evaluation during and after stress testing
6.1 General
6.2 Number of replicate and reference samples tested
6.3 Visual evaluation procedure after environmental stress
6.4 Visual evaluation procedure after mechanical stress
7 Criteria
7.1 General
7.2 Judgment of using limit samples
7.3 Grading using a set of grade samples
7.4 Preparation of limit samples or a group of graded samples
7.5 Judgment of unlimited samples or a group of graded samples
7.6 Evaluation using neutral density filters
7.7 Evaluation methods for mechanical defects
8 Report
8.1 Reporting requirements 14
8.2 Recommended report format
Appendix A (Informative) Rating of Moire Defects Using Neutral Density Filters
Reference
Figure 1 Observation geometry of flexible display devices
Figure 2 Test pattern example
Figure 3 Example of periodic pattern
Figure 4 Example of test pattern for tone and color reproduction
Figure 5 Example of a test pattern displayed on the screen of a deformed test sample
Figure 6 Crosstalk pattern of the diagonal window with gray background at position P0
Figure 7 Monoscopic pattern used to evaluate ultra-high-definition screens 11
Table 1 Example of input signal level series for 8-bit system
Table 2 Other input signal levels for 8-bit systems
Table A:1 Example of using neutral density filters to grade moiré defects 16

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 5-3 of GB/T 38001 Flexible Display Devices: GB/T 38001 has published 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:

This document is equivalent to IEC 62715-5-3:2017 "Flexible display devices Part 5-3: Visual evaluation method":

Introduction

The new display industry is a strategic, basic and leading industry for national economic and social development: Flexible display devices are new display the flexible display industry is one of the important development directions: Due to its bendability, lightness and thinness, its market share has been steadily 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 specify 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 5-3:

Visual evaluation method

1 Scope

This document specifies the overall framework and operating procedures for the visual evaluation of flexible display devices:

This document applies to the visual evaluation methods of flexible display devices in the following states:

---Initial state and aging state under standard environmental conditions;

---State under mechanical or environmental stress conditions;

--- State after mechanical durability test, state after environmental durability test, state after mechanical and environmental combined durability test:

NOTE Visual assessment of mechanical or environmental stress is often difficult to perform and this method should be used if applicable:

Visual evaluation is accomplished by comparison of the test sample with a limit sample or a set of graded samples: This document provides limit samples:

The framework and procedures to be followed in the preparation of limit samples and a set of graded samples are described:

It also specifies the visual evaluation methods for different types of defects of limit samples and grade samples:

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 62715-1-1 Flexible display devices Part 1-1: Terms and text symbols (IEC 62715-1-1, Flexible display de-Note: GB/T 38001.11-2020 Flexible display devices Part 1-1: Terminology and text symbols (IEC 62715-1-1:2013, IDT) IEC 62715-6-1 Flexible display devices Part 6-1: Mechanical stress test method (IEC 62715-6-1, Flexible display Note: GB/T 38001.61-2019 Flexible display devices Part 6-1: Mechanical stress test method (IEC 62715-6-1:2014, IDT) IEC 62715-6-2 Flexible display devices Part 6-2: Environmental test methods (IEC 62715-6-2, Flexible display de-IEC 61747-30-1 Liquid crystal display devices Part 30-1: Measurement methods for liquid crystal display modules Transmission type (Liquid crystal display type) Note: GB/T 18910.61-2021 Liquid crystal display devices Part 6-1: Test methods for photoelectric parameters of liquid crystal display devices (IEC 61747-30-1:

2012, NEQ)

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in IEC 62715-1-1 and the following apply:

The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows:

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 18 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 62715 · IEC 61747

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