1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLiquid crystal display devicesPart 5-3: Environmental, endurance and mechanical test methods Glass strength and reliabilityBS EN 61747-5-3:2010National forewordThis British Stand
2、ard is the UK implementation of EN 61747-5-3:2010. It iswhich is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeEPL/47, Semiconductors.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not pur
3、port to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 59788 6ICS 31.120Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the Standar
4、dsPolicy and Strategy Committee on 30 June 2010.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61747-5-3:2010derived from IEC 61747-5-3:2009. It supersedes DD IEC/PAS 61747-5-3:2007The CENELEC common modifications have been implemented at the appropriate places
5、 in the text. The start and finish of each common modificationis indicated in the text by tags .EUROPEAN STANDARD EN 61747-5-3 NORME EUROPENNE EUROPISCHE NORM May 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee
6、fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61747-5-3:2010 E ICS 31.120 English version Liquid crystal display devices - Part 5-3: Enviro
7、nmental, endurance and mechanical test methods - Glass strength and reliability (IEC 61747-5-3:2009, modified) Dispositifs daffichage cristaux liquides - Part 5-3: Mthodes dessais denvironnement, dendurance et mcaniques - Rsistance et fiabilit du verre (CEI 61747-5-3:2009, modifie) Flssigkristall-An
8、zeige-Bauelemente - Teil 5-3: Verfahren zur Messung von Glasfestigkeit und Zuverlssigkeit (IEC 61747-5-3:2009, modifiziert) This European Standard was approved by CENELEC on 2010-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for g
9、iving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three officia
10、l versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committ
11、ees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and t
12、he United Kingdom. 2 Foreword The text of the International Standard IEC 61747-5-3:2009, prepared by IEC TC 110, Flat panel display devices, together with the common modifications prepared by the CENELEC Reporting Secretariat 110 (NL), was submitted to the CENELEC formal vote and was approved by CEN
13、ELEC as EN 61747-5-3 on 2010-05-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which
14、the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-05-01 Annex ZA has been added by CENELEC. _ BS EN 61747-5-3:2010EN 61
15、747-5-3:2010 (E) 3 Endorsement notice The text of the International Standard IEC 61747-5-3:2009 was approved by CENELEC as a European Standard with agreed common modifications. BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 4 Annex ZA (normative) Normative references to international publications with th
16、eir corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When
17、 an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 61747-1 - Liquid crystal and solid-state display devices - Part 1: Generic specification EN 61747-1 - IEC 61747-5 1998 Liquid crystal and sol
18、id-state display devices - Part 5: Environmental, endurance and mechanical test methods EN 61747-5 1998 BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 5 CONTENTS INTRODUCTION.1 Scope.2 Normative references .3 Terms and definitions .4 Abbreviated terms 5 Apparatus.5.1 General .5.2 Method A: Quasistatic bi
19、axial strength.5.3 Method B: Quasistatic edge strength (parent glass).5.4 Method C: Quasistatic strength (module).5.5 Method D: Fatigue constant.16 Test sample16.1 General .16.2 Parent glass 16.3 Full size module 17 Procedure: Quasistatic loading .128 Stress calculations .18.1 General .18.2 Quasista
20、tic biaxial strength (parent glass) .18.3 Quasistatic edge strength (parent glass) .18.4 Quasistatic failure load (LCD module) .19 Fatigue and reliability calculations19.1 General .19.2 Fatigue constant calculation 19.3 Weibull parameter calculation from dynamic failure stress data .19.4 Fatigue con
21、stant calculation 110 Reporting requirements 1Annex A (informative) Worked test example.1Bibliography1Figure 1 Schematic of ROR test fixture for measuring biaxial strength of parent glass .Figure 2 Vertical bend test fixture for measuring the edge strength of parent glass Figure 3 Schematic of stren
22、gth measurement for full-size LCD module 1Figure A.1 Weibull plot of biaxial strength of abraded glass with different thicknesses .1Figure A.2 Fracture surface of parent glass with 0,089 mm mirror radius .1Figure A.3 Plot of calculated strength versus 1/square root of mirror radius .17Figure A.4 Wei
23、bull distribution of the strength of 17” module1Table A.1 Example of strength data before and after abrasion .1Table A.2 Example of strength data for all modules and low strength modules.1BS EN 61747-5-3:2010EN 61747-5-3:2010 (E)6 7 7 7 8 8 8 9 9 10 1 1 1 2 2 2 2 2 3 3 3 3 4 4 4 5 6 9 9 10 1 6 7 8 6
24、 8 6 INTRODUCTION IEC 61747-5-3 facilitates the characterization of mechanical strength properties of LCD modules and their component glass. Analysis and testing are performed on LCD Module component glass as well as finished LCD modules. Statistics of mechanical strength of the modules are determin
25、ed allowing a prediction of module failure probability at a given stress level or for a given probability of failure, the maximum recommended safe loading stress for the module. BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 7 LIQUID CRYSTAL DISPLAY DEVICES Part 5-3: Environmental, endurance and mechanic
26、al test methods Glass strength and reliability 1 Scope This part of IEC 61747 applies to commercially available liquid crystal displays (LCDs). This standard applies to all LCD types, including transmissive, reflective or transflective liquid crystal display (LCD) modules using either segment, passi
27、ve or active matrix and achromatic or colour type LCDs that are equipped with their own integrated source of illumination or without their own source of illumination. The objective of this standard is to establish uniform requirements for accurate and reliable measurements of the following LCD param
28、eters: a) quasistatic strength, b) quasistatic fatigue. The methods described in this standard apply to all sizes, small and large, liquid crystal displays. NOTE Methods for measuring the fatigue constant are described in this standard and are taken from the referenced literature, see 131to 20. The
29、primary results are formulae for estimated allowable stress for the specified lifetime or estimated failure rate for the specified stress level. As an example, limited data for strength and fatigue behaviour of LCD glass are included in an informative Annex A. Similarly, limited data for static stre
30、ngth of LCD modules are also included and compared with that of parent glass. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refe
31、renced document (including any amendments) applies. IEC 61747-1, Liquid crystal and solid-state display devices Part 1: Generic specification IEC 61747-5:1998, Liquid crystal and solid-state display devices Part 5: Environmental, endurance and mechanical test methods 3 Terms and definitions For the
32、purposes of this document, the following terms and definitions apply. 3.1 strength stress at which a sample fails for a given loading condition 3.2 LCD surface strength biaxial strength wherein surface flaws with different orientations are subjected to uniform tension during measurement 1Figures in
33、square brackets refer to the bibliography. BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 8 NOTE Refer to 1 to 4 in the bibliography for further information. 3.3 LCD edge strength uniaxial strength wherein edge flaws are subjected to tension during measurement NOTE Refer to 5 to 8 in the bibliography for
34、 further information. 3.4 LCD (mechanical) reliability either an estimated allowable stress which the LCDs can sustain for a specified period of time or as an estimated failure rate at a specified stress level NOTE 1 Both approaches for quantifying the reliability of LCDs use the power law for slow
35、crack growth and require the knowledge of fatigue constant for the parent glass employed in the LCD displays. NOTE 2 Refer to 9 to 12 in the bibliography for further information. 3.5 parent glass sheet glass used as raw material for manufacturing of LCD panels and modules 4 Abbreviated terms For the
36、 purposes of this document, the following abbreviations apply. FC filled cell FEA finite element analysis FPD flat panel display LCD liquid crystal display ROR ring on ring VBT vertical bend test 5 Apparatus 5.1 General The parameters in the following figures are used in the stress formulas of Claus
37、e 8. The dimensions are: load (force), in newtons (N), dimensions, in millimetres (mm), stress, in megapascals (MPa). The standard atmospheric conditions in IEC 61747-5, 1.4.3, shall apply, except that the relative humidity shall be in excess of 95 % (vapour) unless otherwise specifically agreed bet
38、ween the customer and the supplier. NOTE In general, humidity can affect the measured strength, with higher humidity leading to decreased strength values. For this reason, as well as to ensure consistency and reproducibility, the humidity level is stated at the highest practical level. BS EN 61747-5
39、-3:2010EN 61747-5-3:2010 (E)Text deleted Text deleted 9 5.2 Method A: Quasistatic biaxial strength The quasistatic biaxial strength of parent glass is measured in the ring on ring (ROR) fixture as shown in Figure 1. The dimensions of load and support rings are selected so as to minimize large deflec
40、tion and the associated membrane stress, especially for ultra-thin glass, although the effect of such non-linearities on strength can be quantified using finite element analysis (FEA), see the bibliographical references 21 to 24. All ring surfaces in contact with the test specimens should be rounded
41、, with radii of 2 to 3 times the thickness of the glass specimen. In general, certain trade-offs are necessary in designing the test specimen and ROR fixture because the key objective is to measure quasistatic strength of as large a test area as possible without introducing large nonlinearities. Alt
42、ernatively a large sample quantity is required to obtain the strength distribution representative of full size module. Since the strength of glass surface is primarily dictated by the quality of that surface, i.e., surface defects, it is imperative to measure the biaxial strength of those surfaces t
43、hat have been exposed to handling and processing damage during the fabrication of LCD devices. Such data are then a good representation of LCD module strength. t (thickness) r2r16,25 mm radius load ring 50 mm 50 mm specimens IEC 545/09 Load12,5 mm radius support ring r3Figure 1 Schematic of ROR test
44、 fixture for measuring biaxial strength of parent glass For square specimens, the specimen radius, r3, is the average of the inscribed and circumscribed circles. 5.3 Method B: Quasistatic edge strength (parent glass) Quasistatic strength of the edges of parent glass is measured in the VBT fixture sh
45、own in Figure 2. The dimensions of glass specimen and test fixture are so chosen as to minimize buckling of the top edge which is in compression during the test because the load is applied from the top. As in the case of surface strength it is equally imperative that the edges of glass specimens sho
46、uld have been exposed to handling and processing damage during the fabrication of LCD devices. In addition the glass specimen should be large enough to represent the full-size module. BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 10 Figure 2 Vertical bend test fixture for measuring the edge strength of
47、parent glass 5.4 Method C: Quasistatic strength (module) The quasistatic strength of full size module is measured by supporting it on the mounting points and loading it at the centre as shown in Figure 3. The loading point of the test fixture is rounded and may be padded to avoid inducing additional
48、 flaws on the glass surface. Several modules are tested in this manner to obtain a statistically significant strength distribution representative of surface damage induced by handling, processing and fabrication of LCD module. These data are also useful for estimating the module strength at orders o
49、f magnitude lower failure probabilities. The same apparatus may also be used for loading the LCD module off-centre and obtaining its strength at different locations. ltLP/2LOADP/2 P/2P/2h IEC 546/09 BS EN 61747-5-3:2010EN 61747-5-3:2010 (E) 11 P IEC 547/09 Figure 3 Photograph and schematic of strength measurement for full-size LCD module 5.5 Method D: Fatigue constant The fatigue constant of parent glass is obtained by measuring its biaxial stre
