Flexible display devices - Part 5-3: Visual assessment of image quality and defects

IEC 62715-5-3:2017(E) provides the framework and procedures for performing the visual assessment of flexible display devices.
Visual assessment stipulated in this document is applicable to flexible display modules in the following states:
- initial states and ageing states under standard ambient conditions,
- mechanically or environmentally stressed conditions,
- states after mechanical endurance test(s), after environmental endurance test(s) and after a combination of mechanical and environmental endurance tests.
Visual assessment is performed by comparing a test sample to a limit sample or to a set of grade samples. This document provides the framework and procedures for visual assessments that use a limit sample or a set of grade samples. This document describes the framework and procedure that are followed while preparing limit samples and a set of grade samples. This document also describes visual assessment when limit samples and grade samples are not available for the same type of defect.
This document provides sets of test patterns that can be used in visual assessments.

General Information

Status
Published
Publication Date
09-May-2017
Technical Committee
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
26-May-2017
Completion Date
10-May-2017
Ref Project

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IEC 62715-5-3 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Flexible display devices –
Part 5-3: Visual assessment of image quality and defects
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IEC 62715-5-3 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Flexible display devices –
Part 5-3: Visual assessment of image quality and defects

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-4298-8

– 2 – IEC 62715-5-3:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Procedures of visual assessment [2][3] . 9
4.1 General . 9
4.2 Setup of displays and driving conditions . 9
4.3 Observers for visual assessment [4][5]. 9
4.4 Ambient conditions for visual assessment . 9
4.4.1 Standard environmental conditions . 9
4.4.2 Standard lighting conditions . 9
4.5 Viewing geometry . 10
4.5.1 General . 10
4.5.2 Designed viewing geometry . 12
4.5.3 Standard usage viewing geometry . 12
4.5.4 Geometry for rigorous assessment . 12
5 Test charts (test signals) . 13
5.1 General . 13
5.2 Full-screen patterns . 13
5.3 Periodic patterns . 15
5.4 Tone and colour gradation patterns . 16
5.5 Test chart for cross-talk . 19
5.6 Test chart for electro-optical defects . 20
5.7 Test chart for static image resolution . 20
5.8 Natural and synthetic images . 21
6 Visual assessment during and after stress tests . 21
6.1 General . 21
6.2 Number of duplicate and reference DUTs . 21
6.3 Procedures of visual assessment after exposure to environmental stress . 22
6.4 Procedures of visual assessment after exposure to mechanical stress . 22
7 Criteria for judgments . 22
7.1 General concept . 22
7.2 Judgment using a limit sample . 22
7.3 Ranking using a set of grade samples . 22
7.4 Preparation of a limit sample or a set of grade samples . 23
7.4.1 General . 23
7.4.2 Procedures . 23
7.4.3 Affirmation of end-user true needs . 23
7.5 Judgments without a limit sample or a set of grade samples . 24
7.5.1 General . 24
7.5.2 Procedures . 24
7.6 Assessment using an ND (neutral density) filter . 24
7.6.1 General . 24
7.6.2 Procedures . 24
7.7 Assessment method for mechanical defects . 25

8 Reporting. 25
8.1 Requirements for reporting . 25
8.2 Recommendations for reporting . 25
Annex A (informative) Ranking of mura defect using ND filter . 26
Bibliography . 27

Figure 1 – Illustrative viewing geometries of flexible display devices . 11
Figure 2 – Example test patterns . 15
Figure 3 – Examples of periodic patterns . 16
Figure 4 – Example test charts for tone and colour reproduction . 18
Figure 5 – Examples of a test chart displayed on the screen of deformed DUTs . 19
Figure 6 – Cross-talk patterns window boxes on grey background diagonal from the
position at P . 20
Figure 7 – Monoscopic pattern for assessment of ultra high definition screen . 21

Table 1 – Example of the set of input signal levels for an 8-bit system . 13
Table 2 – Other input signal levels for an 8-bit system . 14
Table A.1 – Example of ranking of mura defect using an ND filter . 26

– 4 – IEC 62715-5-3:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLEXIBLE DISPLAY DEVICES –
Part 5-3: Visual assessment of image quality and defects

FOREWORD
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International Standard IEC 62715-5-3 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this International Standard is based on the following documents:
FDIS Report on voting
110/844/FDIS 110/867/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in
...

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