BS IEC 61747-40-5:2018

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Liquid crystal display devices – Mechanical testing of display cover glass for mobile devices. Strength against dynamic impact by a sharp object with the specimen rigidly supported

Published By	Publication Date	Number of Pages
BSI	2018	16

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Description

This part of IEC 61747 is a mechanical performance testing procedure for cover glass used in electronic displays in mobile devices. This document focuses on the measurement of surface impact energy required to fracture a specimen due to the collision of sharp particles onto the surface of a cover glass. This is achieved by dropping a ball on a sheet of coated abrasives placed on the cover glass, which is rigidly supported. The failure mode is associated with damage introduction via sharp contact. Crack propagation is enhanced by central tension in the case of strengthened glass. This failure mode represents one of several field failure modes observed in mobile devices.

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PDF Pages	PDF Title
2	undefined
4	CONTENTS
5	FOREWORD
7	INTRODUCTION
8	1 Scope 2 Normative references 3 Terms and definitions
9	4 General
10	5 Apparatus 5.1 Testing environment and pre-conditioning 5.2 Apparatus overview 5.3 Height adjustment beam Figure 1 – Apparatus overview
11	5.4 Base (granite) 5.5 Coated abrasives 5.6 Armature 5.7 Ball release mechanism 5.8 Height adjustment clamp 5.9 Ball release controller 5.10 Ball 5.11 Base
12	6 Procedure 6.1 Safety 6.1.1 Hazard – Broken glass 6.1.2 Hazard – Compression due to moving ball 6.2 Sample 6.3 Individual specimen
13	6.4 Complete the report 7 Calculations 7.1 Breaking energy 7.2 Statistical calculations
14	Figure 2 – Typical Weibull plot
15	8 Reporting 8.1 Information to be reported for each test 8.2 Information to be made available upon request 9 Specifications

Additional information

Status	Definitive
Pages	16
Publication Date	2018-03-12
ISBN	978 0 580 95924 0
Standard Number	BS IEC 61747-40-5:2018
Title	Liquid crystal display devices – Mechanical testing of display cover glass for mobile devices. Strength against dynamic impact by a sharp object with the specimen rigidly supported
Identical National Standard Of	IEC 61747-40-5:2018
Descriptors	Measurement, Mechanical testing, Impact resistance tests, Semiconductors, Liquid crystal devices, Flexural strength, Cover glasses, Mathematical calculations, Liquid crystal displays
Publisher	BSI
Committee	EPL/100
ICS Codes	31.120 - Electronic display devices

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BS IEC 61747-40-5:2018

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