IEC 62715-5-3:2017
(Main)Flexible display devices - Part 5-3: Visual assessment of image quality and defects
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
Standards Content (Sample)
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.