IEC PAS 61747-5-3:2007

Liquid crystal display devices - Part 5-3: Liquid crystal display devices - Glass strength and reliability measurement method

This PAS applies to commercially available liquid crystal displays (LCDs). This PAS applies to all LCD types, including transmissive, reflective or transflective LCD modules using either segment, passive 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 object of this PAS is to establish uniform requirements for accurate and reliable measurements of the following LCD parameters, as defined herein: a) quasistatic strength; b) quasistatic fatigue. The methods described in this PAS apply to all sizes, small and large, of LCDs.

General Information

• Status: Replaced
• Publication Date: 29-May-2007
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 2 - TC 110/WG 2
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 20-Apr-2009

Relations

• Replaced By: IEC 61747-5-3:2009 - Liquid crystal display devices - Part 5-3: Environmental, endurance and mechanical test methods - Glass strength and reliability
• Effective Date: 05-Sep-2023
• Corrected By: IEC 61747-5-3:2009/COR1:2011 - Corrigendum 1 - Liquid crystal display devices - Part 5-3: Environmental, endurance and mechanical test methods - Glass strength and reliability
• Effective Date: 05-Sep-2023

Standards Content (Sample)

PUBLICLY
IEC
AVAILABLE
PAS 61747-5-3
SPECIFICATION
First edition
Pre-Standard
2007-05
Liquid crystal display devices –
Part 5-3:
Liquid crystal display devices –
Glass strength and reliability
measurement method
Reference number
IEC/PAS 61747-5-3:2007(E)
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
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: 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.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
PUBLICLY
IEC
AVAILABLE
PAS 61747-5-3
SPECIFICATION
First edition
Pre-Standard
2007-05
Liquid crystal display devices –
Part 5-3:
Liquid crystal display devices –
Glass strength and reliability
measurement method
PRICE CODE
Commission Electrotechnique Internationale Q

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – PAS 61747-5-3 © IEC:2007(E)

CONTENTS
FOREWORD.3

INTRODUCTION.4

1 Scope and object.5

2 Normative references .5

3 Terms and definitions .5

4 Abbreviated terms .6
5 Apparatus.6
5.1 Method A: Quasistatic biaxial strength.6
5.2 Method B: Quasistatic edge strength (parent glass).7
5.3 Method C: Quasistatic strength (module).8
5.4 Method D: Fatigue constant.8
6 Test sample.9
6.1 Parent glass .9
6.2 Full-size module .9
7 Procedure: Quasistatic loading .9
8 Stress calculations .9
8.1 Quasistatic biaxial strength (parent glass) .9
8.2 Quasistatic edge strength (parent glass) .10
8.3 Quasistatic failure load (LCD module) .10
9 Fatigue and reliability calculations .10
9.1 Fatigue constant calculation .11
9.2 Weibull parameter calculation from dynamic failure stress data .11
9.3 Static fatigue failure probability calculation.11
10 Reporting requirements .12
Annex A (informative)  Worked test example.13
Annex B (informative)  Bibliography .16

Figure 1 – Schematic of ROR test fixture for measuring biaxial strength of parent
glass.7
Figure 2 – Vertical bend test fixture for measuring the edge strength of parent glass .7

Figure 3 – Schematic of strength measurement for full-size LCD module .8
Figure A.1 – Weibull plot of biaxial strength of abraded glass with different
thicknesses.13
Figure A.2 – Fracture surface of parent glass with 0,089 mm mirror radius .14
Figure A.3 – Plot of calculated strength versus 1/square root of mirror radius .14
Figure A.4 – Weibull distribution of the strength of 17” module.15

Table A.1 – Strength data before and after abrasion .13
Table A.2 – Strength data and Weibull parameters .15

PAS 61747-5-3 © IEC:2007(E) – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 5-3: Liquid crystal display devices – Glass strength

and reliability measurement method

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
A PAS is a technical specification not fulfilling the requirements for a standard but made
available to the public.
IEC-PAS 61747-5-3 has been processed by IEC technical committee 110: Flat panel display devices.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
110/85/NP 110/103/RVN
Following publication of this PAS, which is a pre-standard publication, the technical committee
or subcommittee concerned will transform it into an International Standard.
This PAS shall remain valid for an initial maximum period of three years starting from
2007-05. The validity may be extended for a single three-year period, following which it shall
be revised to become another type of normative document or shall be withdrawn.

– 4 – PAS 61747-5-3 © IEC:2007(E)

INTRODUCTION
This PAS is devoted to the mechanical reliability of liquid crystal display (LCD) devices. This

PAS is restricted to transmissive or reflective LCD modules using either segment, passive 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. Analysis and testing are

performed on LCD module component glass as well as finished on LCD modules. Statistics of

the mechanical strength of the modules are determined, 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.

PAS 61747-5-3 © IEC:2007(E) – 5 –

LIQUID CRYSTAL DISPLAY DEVICES –

Part 5-3: Liquid crystal display devices – Glass strength

and reliability measurement method

1 Scope and object
This PAS applies to commercially available liquid crystal displays (LCDs).
This PAS applies to all LCD types, including transmissive, reflective or transflective LCD
modules using either segment, passive 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 object of this PAS is to establish uniform requirements for accurate and reliable
measurements of the following LCD parameters, as defined herein:
a) quasistatic strength;
b) quasistatic fatigue.
The methods described in this PAS apply to all sizes, small and large, of LCDs.
Methods for measuring the fatigue constant are described in this PAS and are taken from the
referenced literature [13-20]. The primary results are formulae for estimated allowable stress
for the specified lifetime or estimated failure rate for the specified stress level. By way of an
example, limited data for strength and fatigue behaviour of LCD glass are included in an
informative annex to this PAS. Similarly, limited data for the static strength of LCD modules is
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 referenced document (including any amendments) applies.
IEC 61747-5, Liquid crystal display devices – Part 5: Environmental, endurance and
mechanical test methods
3 Terms and definitions
For the 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 [1-4]
3.3
LCD edge strength
uniaxial strength wherein edge flaws are subjected to tension during measurement [5-8]

– 6 – PAS 61747-5-3 © IEC:2007(E)

3.4
LCD (mechanical) reliability
Reliability expressed as either an estimated allowable stress which the LCDs can sustain for a

speci
...