Organic light emitting diode (OLED) displays - Part 5-2: Mechanical endurance test methods

IEC 62341-5-2:2019 is available as IEC 62341-5-2:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62341-5-2:2019 defines test methods for evaluating the mechanical endurance quality of organic light emitting diode (OLED) display panels and modules or their packaged form for transportation. It takes into account, wherever possible, the environmental test methods outlined in IEC 60068 (all parts). The object of this document is to establish uniform preferred test methods for judging the mechanical endurance properties of OLED display devices.
This edition includes the following significant technical changes with respect to the previous edition:
- Vibration and shock tests for large displays (for example, TVs and monitors) are added.

General Information

Status
Published
Publication Date
17-Mar-2019
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
18-Mar-2019
Ref Project

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IEC 62341-5-2
Edition 2.0 2019-03
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –
Part 5-2: Mechanical endurance test methods
IEC 62341-5-2:2019-03(en)
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IEC 62341-5-2
Edition 2.0 2019-03
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –
Part 5-2: Mechanical endurance test methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-6603-8

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62341-5-2:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Abbreviated terms ........................................................................................................... 7

5 Standard atmospheric conditions ..................................................................................... 7

6 Evaluation ....................................................................................................................... 7

6.1 Visual examination and verification of dimensions ................................................... 7

6.2 Reporting ................................................................................................................ 8

7 Mechanical endurance test methods ................................................................................ 8

7.1 General ................................................................................................................... 8

7.2 Vibration (sinusoidal) .............................................................................................. 8

7.2.1 General ........................................................................................................... 8

7.2.2 Purpose ........................................................................................................... 8

7.2.3 Test apparatus ................................................................................................ 8

7.2.4 Test procedure ................................................................................................ 8

7.2.5 Evaluation ..................................................................................................... 12

7.3 Shock ................................................................................................................... 12

7.3.1 General ......................................................................................................... 12

7.3.2 Purpose ......................................................................................................... 12

7.3.3 Test apparatus .............................................................................................. 12

7.3.4 Test procedure .............................................................................................. 12

7.3.5 Evaluation ..................................................................................................... 13

7.4 Quasistatic strength .............................................................................................. 13

7.4.1 General ......................................................................................................... 13

7.4.2 Purpose ......................................................................................................... 13

7.4.3 Specimen ...................................................................................................... 14

7.4.4 Test apparatus .............................................................................................. 14

7.4.5 Test procedure .............................................................................................. 14

7.4.6 Evaluation ..................................................................................................... 15

7.5 Four-point bending test ......................................................................................... 15

7.5.1 General ......................................................................................................... 15

7.5.2 Purpose ......................................................................................................... 15

7.5.3 Specimen ...................................................................................................... 15

7.5.4 Test apparatus .............................................................................................. 16

7.5.5 Test procedure .............................................................................................. 17

7.5.6 Post-testing analysis ...................................................................................... 17

7.5.7 Evaluation ..................................................................................................... 18

7.6 Transportation drop test ........................................................................................ 18

7.6.1 General ......................................................................................................... 18

7.6.2 Purpose ......................................................................................................... 18

7.6.3 Test sample ................................................................................................... 18

7.6.4 Test procedure .............................................................................................. 18

7.6.5 Evaluation ..................................................................................................... 19

7.7 Peel strength test .................................................................................................. 19

7.7.1 Purpose ......................................................................................................... 19

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IEC 62341-5-2:2019 © IEC 2019 – 3 –

7.7.2 Test procedure .............................................................................................. 19

7.7.3 Evaluation ..................................................................................................... 20

7.8 Shock test for large size display ............................................................................ 20

7.8.1 Purpose ......................................................................................................... 20

7.8.2 Test procedure .............................................................................................. 20

Annex A (informative) Example of raw test data reduction for four-point bending test ........... 21

A.1 Purpose ................................................................................................................ 21

A.2 Sample test results ............................................................................................... 21

A.3 Finite element analysis ......................................................................................... 22

A.4 Use of conversion factor ....................................................................................... 26

A.5 Evaluation ............................................................................................................. 27

Bibliography .......................................................................................................................... 29

Figure 1 – Example of the specimen and jig ............................................................................ 9

Figure 2 – Directions of vibration test ...................................................................................... 9

Figure 3 – Configuration of OLED shock test set-up .............................................................. 12

Figure 4 – Schematic of quasistatic strength measurement apparatus example .................... 14

Figure 5 – Schematics of test apparatus and pinned bearing edges ...................................... 16

Figure 6 – Specimen configuration under four-point bending test .......................................... 16

Figure 7 – Order of transportation package drop ................................................................... 19

Figure 8 – Example of peeling strength test .......................................................................... 20

Figure A.1 – Specimen dimensions used for sample test ....................................................... 21

Figure A.2 – Examples of test results: Load-displacement curves ......................................... 22

Figure A.3 – Finite element model of test specimen .............................................................. 23

Figure A.4 – Displacement contour map after moving the loading bar down by 2 mm ............ 24

Figure A.5 – Contour map of maximum principal stress distribution ....................................... 24

Figure A.6 – Maximum principal stress and maximum stress along the edge ......................... 25

Figure A.7 – Final relationship between panel strength and failure load ................................ 25

Figure A.8 – Extraction of conversion factor by linear fitting .................................................. 26

Figure A.9 – Example of Weibull distribution of strength data and statistical outputs ............. 28

Figure A.10 – Fitted failure probability distribution of strength data and B strength ............ 28

Table 1 – Frequency range – Lower end ............................................................................... 10

Table 2 – Frequency range – Upper end ............................................................................... 10

Table 3 – Recommended frequency ranges .......................................................................... 11

Table 4 – Recommended vibration amplitudes ...................................................................... 11

Table 5 – Conditions for shock test ....................................................................................... 13

Table 6 – Examples of test parameter combinations ............................................................. 17

Table 7 – Example of package drop sequence ...................................................................... 19

Table A.1 – Results of raw test data ..................................................................................... 22

Table A.2 – Example of conversion factor (t = 0,4mm, test span = 20mm/40mm) .................. 26

Table A.3 – Failure load and converted strength data ........................................................... 27

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– 4 – IEC 62341-5-2:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –
Part 5-2: Mechanical endurance test methods
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

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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

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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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.

International Standard IEC 62341-5-2 has been prepared by IEC technical committee 110:

Electronic display devices.

This second edition replaces the first edition published in 2013. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) Vibration and shock tests for large displays (for example, TVs and monitors) are added.

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IEC 62341-5-2:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
110/1069/FDIS 110/1083/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all the parts in the IEC 62341 series, under the general title Organic light emitting

diode (OLED) displays, can be found on the IEC website.

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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– 6 – IEC 62341-5-2:2019 © IEC 2019
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –
Part 5-2: Mechanical endurance test methods
1 Scope

This part of IEC 62341 defines test methods for evaluating the mechanical endurance quality

of organic light emitting diode (OLED) display panels and modules or their packaged form for

transportation. It takes into account, wherever possible, the environmental test methods

outlined in IEC 60068 (all parts). The object of this document is to establish uniform preferred

test methods for judging the mechanical endurance properties of OLED display devices.

There are generally two categories of mechanical endurance tests: those relating to the

product usage environment and those relating to the transportation environment in packaged

form. Quasistatic strength, four-point bending and peel strength tests are introduced here for

usage environment, while vibration, shock and transportation drop tests are applicable to the

transportation environment. Mechanical endurance tests can be categorized into mobile

applications, notebook computer or monitor applications and large size TV applications.

Special considerations or limitations of test methods according to the size or application of the

specimen are noted.

In case of contradiction between this document and a relevant specification, the latter will

govern.

NOTE This document is established separately from IEC 61747-5-3, because the technology of organic light

emitting diodes is considerably different from that of liquid crystal devices in such matters as:

– used materials and structure
– operation principles
– measuring methods
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance:

Shock

IEC 61747-1-1:2014, Liquid crystal and solid-state display devices – Part 1-1: Generic –

Generic specification

IEC 61747-5-3:2009, Liquid crystal display devices – Part 5-3: Environmental, endurance and

mechanical test methods – Glass strength and reliability

IEC 61747-10-1:2013, Liquid crystal display devices – Part 10-1: Environmental, endurance

and mechanical test methods – Mechanical

IEC 62341-5:2009, Organic light emitting diode (OLED) displays – Part 5: Environmental

testing methods
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IEC 62341-5-2:2019 © IEC 2019 – 7 –

IEC 62341-6-1, Organic light emitting diode (OLED) displays – Part 6-1: Measuring methods

of optical and electro-optical parameters

IEC 62341-6-2:2015, Organic light emitting diode (OLED) displays – Part 6-2: Measuring

methods of visual quality and ambient performance

ISO 2206, Packaging – Complete, filled transport packages – Identification of parts when

testing

ISO 2248:1985, Packaging – Complete, filled transport packages – Vertical impact test by

dropping
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Most of the definitions used comply with IEC 62341-1-2.
3.1
strength
stress at which a sample fails for a given loading condition
3.2
glass edge strength

measured stress at failure where the failure origin is known to have occurred at an edge

4 Abbreviated terms
B the value at the lower 10 % position in the Weibull distribution [1]
FEA finite element analysis
FPCB flexible printed circuit board
TSP touch screen panel
5 Standard atmospheric conditions

The standard atmospheric conditions in IEC 62341-5:2009, 5.3, shall apply unless otherwise

specifically agreed between customer and supplier.
6 Evaluation
6.1 Visual examination and verification of dimensions

The specimen shall be submitted to the visual and dimensional checks in non-operation

conditions and functional checks in operational conditions specified by the following:

_____________
Numbers in square brackets refer to the Bibliography.
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– 8 – IEC 62341-5-2:2019 © IEC 2019

a) visual checks of damage to the exterior body of the specimen including marking,

encapsulation and terminals shall be done as specified in IEC 61747-1-1:2014, 4.3;

b) dimensions given in the relevant specification shall be verified;

c) visual and optical performance shall be checked as specified in IEC 62341-6-1.

Unless otherwise specified, visual inspection shall be performed under the conditions and

methods specified in IEC 62341-6-2:2015, 6.2.
6.2 Reporting

For the main results in each test, generally the minimum and averaged values or B value

instead of the minimum value shall be reported over the number of specimens depending on

the test purposes. The relevant specification shall provide the criteria upon which the

acceptance or rejection of the specimen is to be based.
7 Mechanical endurance test methods
7.1 General

Choice of the appropriate tests depends on the type of devices. The relevant specification

shall state which tests are applicable.
7.2 Vibration (sinusoidal)
7.2.1 General

Test Fc, specified in IEC 60068-2-6 and IEC 61747-10-1:2013, 5.4, is applicable with the

following specific conditions. In case of contradiction between these documents,
IEC 61747-10-1:2013, 5.4, shall prevail.
7.2.2 Purpose

The purpose of this test is to investigate the behaviour of the specimen in a vibration

environment such as transportation or in actual use.
7.2.3 Test apparatus

The equipment shall be capable of maintaining the test conditions specified in 7.2.4.1. The

vibration testing table should not resonate within the test condition vibration frequency range.

The required characteristics apply to the complete vibration system, which includes the power

amplifier, vibrator, test fixture, specimen and control system when loaded for testing. The

body of the device shall be securely clamped during the test. If the device has a specified

method of installation, it shall be used to clamp the device. The specimen shall be tested

under the non-operational condition.
7.2.4 Test procedure
7.2.4.1 General

The test specimen should be hooked up to the jig as shown in Figure 1 for a large size display.

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Top
IEC 62341-5-2:2019 © IEC 2019 – 9 –
Top
Display
Jig
IEC
Figure 1 – Example of the specimen and jig

During this test for the large size display, the specimen should be turned off and the test

based on the specific time; the specimen quality is checked. The jig is on the base plate,

which should be fixed at the plate. The conditions for fixation of the specimen are depicted in

Figure 2 according to the different axes.
Top
Top
Base plate
Base plate
Base plate IEC
IEC
IEC
a) x-axis b) y-axis c) z-axis
Figure 2 – Directions of vibration test

To start, the condition should be as in Figure 2a), and the vibration frequency and the

duration time should be reported. After testing the x-axis condition, the specimen should be

set as in Figure 2b). The test with the specified vibration frequency and the duration time

should be operated. Finally, the test with the z-axis should be done. The test shall be

performed as described in 7.2.4.2.
NOTE The large size is defined for TVs. The size would be over 40 in.
7.2.4.2 Test conditions
7.2.4.2.1 Basic motion

The basic motion shall be a sinusoidal function of time and such that the fixing points of the

specimen move substantially in phase and in straight parallel lines.
7.2.4.2.2 Spurious motion
The maximum amplitude of spurious transverse motion at the check points in any

perpendicular area to the specified axis shall not exceed 25 %. In the case of large size or

high mass specimens, the occurrence of spurious rotational motion of the vibration table can

be important. If so, the relevant specification shall specify a tolerance level.
7.2.4.2.3 Signal tolerance

Unless otherwise stated in the relevant specification, acceleration signal tolerance

measurements shall be performed and signal tolerance shall not exceed 5 %.
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– 10 – IEC 62341-5-2:2019 © IEC 2019
7.2.4.2.4 Vibration amplitude tolerance
Reference point: ±15 %.
Check point: ±25 %.
7.2.4.2.5 Frequency tolerances
7.2.4.2.5.1 Endurance by sweeping
±1 Hz from 5 Hz to 50 Hz.
±2 % above 50 Hz.
7.2.4.2.5.2 Endurance at critical frequencies
±2 %.
7.2.4.3 Severities
7.2.4.3.1 General

A vibration severity is defined by the combination of three parameters: frequency range,

vibration amplitude and duration of endurance (in sweep cycles or time).
7.2.4.3.2 Frequency range

The frequency range shall be given in the relevant specification by selecting a lower

frequency from Table 1 and an upper frequency from Table 2.
Table 1 – Frequency range – Lower end
Lower frequency f (Hz)
Table 2 – Frequency range – Upper end
Upper frequency f (Hz)
100
200
300
500
The recommended ranges are shown in Table 3.
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IEC 62341-5-2:2019 © IEC 2019 – 11 –
Table 3 – Recommended frequency ranges
Recommended frequency ranges, from f to f (Hz)
1 2
5 to 100
5 to 200
5 to 500
10 to 55
10 to 200
10 to 300
10 to 500
7.2.4.3.3 Vibration amplitude

The vibration amplitude shall be stated in the relevant specification. Recommended vibration

amplitudes with cross-over frequency are shown in Table 4.
Table 4 – Recommended vibration amplitudes
Displacement amplitude below
Acceleration amplitude above the cross-over frequency
the cross-over frequency
m/s g
0,035 4,9 0,5
0,075 9,8 1,0
0,10 14,7 1,5
0,15 19,6 2,0
0,20 29,4 3,0

NOTE 1 The values listed apply in Table 4 for cross-over frequencies between 57 Hz and 62 Hz.

NOTE 2 Regardless of display size, the same amplitude is calculated and applied at per unit area.

7.2.4.3.4 Duration of endurance
7.2.4.3.4.1 Endurance by sweeping

The duration of the endurance test in each axis shall be given as a number of sweep cycles

chosen from the list given below:
1, 5, 10, 20, 30, 45, 60, 120

The sweeping shall be continuous and the frequency shall change exponentially with time

...

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