IEC_61747-40-4-2015.pdf

IEC 61747-40-4 Edition 1.0 2015-01 INTERNATIONAL STANDARD Liquid crystal display devices Part 40-4:Mechanical testing of display cover glass for mobile devices Biaxial flexural strength(ring-on-ring)IEC 61747-40-4:2015-01(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC,Geneva,Switzerland 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 IECs 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 Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.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 The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Android Tablets and iPad.IEC publications search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French,with equivalent terms in 15 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:csciec.ch.IEC 61747-40-4 Edition 1.0 2015-01 INTERNATIONAL STANDARD Liquid crystal display devices Part 40-4:Mechanical testing of display cover glass for mobile devices Biaxial flexural strength(ring-on-ring)INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120 ISBN 978-2-8322-2212-6 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC 61747-40-4:2015 IEC 2015 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviations.6 3.1 Terms and definitions.6 3.2 Abbreviations.6 4 General.7 5 Apparatus.7 5.1 Testing environment and pre-conditioning.7 5.2 Testing frame.7 5.3 Test fixture and setup.9 5.4 Test fixture dimensions.11 5.5 Loading rate.11 6 Procedure.11 6.1 Safety.11 6.1.1 Hazard Broken glass.11 6.1.2 Crush hazard Only one person may operate the testing frame.11 6.1.3 Crush hazard Take care when installing or removing a specimen.11 6.1.4 Hazard Press the emergency stop button when an unsafe condition is observed.12 6.1.5 Flying debris hazard Ensure that specimens are installed correctly.12 6.1.6 Hazard Protect control cables from damage or disconnection.12 6.2 Sample.12 6.3 Individual specimen.12 6.4 Complete the report.14 7 Calculations.15 8 Reporting.16 8.1 Information to be reported for each test.16 8.2 Information to be made available upon request.16 9 Specifications.16 Bibliography.18 Figure 1 Testing frame.8 Figure 2 Support assembly(side view,cross-section).9 Figure 3 Support assembly(top view).9 Figure 4 Load assembly(side view,cross-section).10 Figure 5 Load assembly(bottom view).10 Figure 6 Surface fracture originating from inside the load ring.13 Figure 7 Surface fracture originating from underneath the load ring.14 Figure 8 Edge fracture originating from outside the load ring.14 Figure 9 Example Weibull plot.16 IEC 61747-40-4:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LIQUID CRYSTAL DISPLAY DEVICES Part 40-4:Mechanical testing of display cover glass for mobile devices Biaxial flexural strength(ring-on-ring)FOREWORD 1)The International Electrotechnic