IEC 61747-40-1:2013

IEC 61747-40-1 ®
Edition 1.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Liquid crystal display devices –
Part 40-1: Mechanical testing of display cover glass for mobile devices –
Guidelines
Dispositifs d’affichage à cristaux liquides –
Partie 40-1: Essais mécaniques des verres protecteurs des affichages pour les
dispositifs mobiles – Lignes directrices

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IEC 61747-40-1 ®
Edition 1.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Liquid crystal display devices –

Part 40-1: Mechanical testing of display cover glass for mobile devices –

Guidelines
Dispositifs d’affichage à cristaux liquides –

Partie 40-1: Essais mécaniques des verres protecteurs des affichages pour les

dispositifs mobiles – Lignes directrices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX K
ICS 31.120 ISBN 978-2-83220-862-5

– 2 – 61747-40-1 © IEC:2013
CONTENTS
FOREWORD . 3

INTRODUCTION . 5

1 Scope . 6

2 Terms and definitions . 6

3 Mechanical performance testing guidelines . 7

3.1 General . 7

3.2 Mechanical testing guidelines for display cover glass for mobile devices . 8

4 Brief overview of mechanical test methods . 8
Bibliography . 10

Table 1 – Mechanical attributes and measurement methods . 8

61747-40-1 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 40-1: Mechanical testing of display cover glass

for mobile devices – Guidelines

FOREWORD
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International Standard IEC 61747-40-1 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/464/FDIS 110/476/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 61747-40-1 © IEC:2013
A list of all the parts in the IEC 61747 series, under the general title Liquid crystal display

devices, can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61747-40-1 © IEC:2013 – 5 –
INTRODUCTION
Mobile electronic devices have become increasingly sophisticated and often incorporate

displays for the purposes of user interface and viewing. Such displays commonly incorporate

a transparent cover glass which aids in protecting the display against the introduction of

damage through routine device transport and use, as well as occasional or accidental misuse.

The purpose of this standard is to provide mechanical testing guidelines for cover glasses

utilized in such applications. Such glasses may or may not be strengthened, for example via

an ion-exchange process, which acts to increase mechanical strength through the introduction

of a surface compressive layer.

It is assumed that all measurements – described in detail in individual test method standards
– are performed by personnel skilled in the general art of mechanical property measurements.
Furthermore, it should be assured that all equipment is suitably calibrated as is known to
skilled personnel and that records of the calibration data and traceability are kept.

– 6 – 61747-40-1 © IEC:2013
LIQUID CRYSTAL DISPLAY DEVICES –

Part 40-1: Mechanical testing of display cover glass

for mobile devices – Guidelines

1 Scope
This part of IEC 61747 is a mechanical performance testing guideline for cover glass used in
electronic flat panel displays in mobile devices. This document focuses on key mechanical
testing performance parameters and covers mainly strength and damage resistance attributes.
The test methods will focus on the cover glass level testing only.
NOTE The glass used for cover glasses for electronic mobile devices can be chemically strengthened by an ion-
exchange process. This ion exchange process increases the mechanical strength of the glass.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
abraded
subjected to a defined process which introduces mechanical abrasive damage to a portion of
the specimen to be placed under tension during subsequent flexural strength testing, for
example, biaxial flexure via ring-on-ring
2.2
as-received
representative of standard sample preparation and handling practices, and therefore free of
intentional mechanical damage such as abrasion, scratching, or indentation
Note 1 to entry: The strength of glass is not an intrinsic material property, and like other brittle elastic materials,
is highly dependent upon the surface flaw population. The term “as-received” is meant to represent the surface
condition upon specimen receipt and should be distinguished from a condition where damage has been
intentionally introduced prior to testing.
2.3
central tension
CT
tensile stress generated within the interior of a glass article which serves to co
...