IEC 62341-5-2:2013

IEC 62341-5-2


®


Edition 1.0 2013-07



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
colour
inside


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

Afficheurs à diodes électroluminescentes organiques (OLED) –
Partie 5-2: Méthodes d’essais d'endurance mécanique


IEC 62341-5-2:2013

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IEC 62341-5-2



®



Edition 1.0 2013-07







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
colour

inside










Organic light emitting diode (OLED) displays –

Part 5-2: Mechanical endurance testing methods




Afficheurs à diodes électroluminescentes organiques (OLED) –

Partie 5-2: Méthodes d’essais d'endurance mécanique

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX U


ICS 31.260 ISBN 978-2-8322-0964-6



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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS


FOREWORD . 4

1 Scope . 6


2 Normative references . 6

3 Terms and definitions . 7

4 Abbreviations . 7

5 Standard atmospheric conditions . 7

6 Evaluations . 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 . 11
7.3 Shock . 11
7.3.1 General . 11
7.3.2 Purpose . 11
7.3.3 Test apparatus . 11
7.3.4 Test procedure . 11
7.3.5 Evaluation . 12
7.4 Quasistatic strength . 12
7.4.1 General . 12
7.4.2 Purpose . 12
7.4.3 Specimen . 13
7.4.4 Test apparatus . 13
7.4.5 Test procedure . 13
7.4.6 Evaluation . 14
7.5 Four-point bending test . 14
7.5.1 General . 14

7.5.2 Purpose . 14
7.5.3 Specimen . 14
7.5.4 Test apparatus . 15
7.5.5 Test procedure . 15
7.5.6 Post-testing analysis . 16
7.5.7 Evaluation . 17
7.6 Transportation drop test . 17
7.6.1 General . 17
7.6.2 Purpose . 17
7.6.3 Test sample . 17
7.6.4 Test procedure . 17
7.6.5 Evaluation . 18
7.7 Peel strength test . 18
7.7.1 Purpose . 18

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62341-5-2 © IEC:2013 – 3 –


7.7.2 Test procedure . 18

7.7.3 Evaluation . 19

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

test . 20


Bibliography . 28



Figure 1 – Configuration of OLED shock test set-up . 11

Figure 2 – Schematic of quasistatic strength measurement apparatus example . 13

Figure 3 – Schematics of test apparatus and pinned bearing edges . 15

Figure 4 – Specimen configuration under four-point bending test . 15
Figure 5 – Order of transportation package drop . 18
Figure 6 – Example of peeling strength test . 19
Figure A.1 – Specimen dimensions used for sample test . 20
Figure A.3 – Finite element model of test specimen . 22
Figure A.4 – Displacement contour map after moving down loading-bar by 2 mm . 23
Figure A.5 – Contour map of maximum principal stress distribution . 23
Figure A.6 – Maximum principal stress and maximum stress along the edge . 24
Figure A.7 – Final relationship between panel strength and failure load . 24
Figure A.8 – Extraction of conversion factor by linear fitting . 25
Figure A.9 – Example of Weibull distribution of strength data and statistical outputs . 27
Figure A.10 – Fitted failure probability distribution of strength data . 27

Table 1 – Frequency range – Lower end . 9
Table 2 – Frequency range – Upper end . 9
Table 3 – Recommended frequency ranges . 10
Table 4 – Recommended vibration amplitudes . 10
Table 5 – Conditions for shock test . 12
Table 6 – Examples of test parameter combinations . 16
Table 7 – Example of package drop sequence . 18
Table A.1 – Results of raw test data . 21
Table A.2 – Example of conversion factor (t = 0,4 mm, test span = 20 mm/40 mm) . 25

Table A.3 – Failure load and converted strength data . 26

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –



Part 5-2: Mechanical endurance testing 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
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
International Standard IEC 62341-5-2 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
110/472/FDIS 110/486/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.
A list of all parts in the IEC 62341 series, published under the general title Organic light
emitting diode (OLED) displays, can be found on the IEC website.

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62341-5-2 © IEC:2013 – 5 –


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.





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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ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –



Part 5-2: Mechanical endurance testing methods








1 Scope


This part of IEC 62341 defines testing methods for evaluating 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 testing methods
outlined in specific parts of IEC 60068. The object of this standard 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. Vibration, shock, quasistatic strength, four-point bending test and peel strength test are
introduced here for usage environment, while transportation drop test is applicable to the
transportation environment. Mechanical endurance tests may also be categorized into mobile
application, notebook computer or monitor application and large size TV application. Special
considerations or limitations of test methods according to the size or application of the
specimen will be noted.
NOTE This standard 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, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-6:2007, 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 61747-5:1998, Liquid crystal and solid-state display devices – Part 5: Environmental,
endurance and mechanical test methods
IEC 61747-5-3:2009, Liquid crystal display devices – Part 5-3: Environmental, endurance and
mechanical test methods – Glass strength and reliability
IEC 62341-1-2:2007, Organic light emitting diode displays – Part 1-2: Terminology and letter
symbols
IEC 62341-5:2009, Organic light emitting diode (OLED) displays – Part 5: Environmental
testing methods
IEC 62341-6-1:2009, Organic light emitting diode (OLED) displays – Part 6-1: Measuring
methods of optical and electro-optical parameters

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62341-5-2 © IEC:2013 – 7 –


IEC 62341-6-2:2012, Organic light emitting diode (OLED) displays – Part 6-2: Measuring

methods of visual quality and ambient performance


ISO 2206:1987, 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 terms and definitions given in IEC 62341-1-2 and the
following apply.
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 Abbreviations
FEA finite element analysis
FPCB flexible printed circuit board
1
B the value at lower 10 % position in the Weibull distribution [1]
10
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 Evaluations
6.1 Visual examination and verification of dimensions

The specimen shall be submitted to the visual, dimensional checks in non-operation condition
and functional checks in operational condition prescribed by the following specification.
a) Visual checks of damage to exterior body of the specimen including marking,
encapsulation and terminals shall be examined as specified in IEC 61747-5:1998, 1.5.
b) Dimensions given in the customer’s 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 as specified in IEC 62341-6-2:2012, 6.2.
———————
1
 Numbers in square brackets refer to the bibliography.

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6.2 Reporting


For the main results in each test, generally the minimum and averaged values or B value
10

instead of 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 61747-5:1998, 2.3, are applicable with the
following specific conditions. In case of contradiction between these standards,
IEC 61747-5:1998, 2.3, shall govern.
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. 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 Test conditions
7.2.4.1.1 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.
7.2.4.1.2 Spurious motion
The maximum amplitude of spurious transverse motion at the check points in any
perpendicular 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 may be
important. If so, the relevant specification shall prescribe a tolerance level.
7.2.4.1.3 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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7.2.4.1.4 Vibration amplitude tolerance

Reference point: ± 15 %;

Check point: ± 25 %.


7.2.4.1.5 Frequency tolerances


7.2.4.1.5.1 Endurance by sweeping

± 1 Hz from 5 Hz to 50 Hz;


± 2 % above 50 Hz.

7.2.4.1.5.2 Endurance at critical frequencies
± 2 %.
7.2.4.2 Severities
7.2.4.2.1 General
A vibration severity is defined by the combination of the three parameters: frequency range,
vibration amplitude and duration of endurance (in sweep cycles or time).
7.2.4.2.2 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
1
Hz
5
10
20

Table 2 – Frequency range – Upper end
Upper frequency f
2
Hz

55
100
200
300
500

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The recommended ranges are shown in Table 3.


Table 3 – Recommended frequency ranges


Recommended frequency ranges, from

f to f
1 2

Hz

5 to 100

5 to 200

5 to 500

10 to 55
10 to 200
10 to 300
10 to 500

7.2.4.2.3 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
Acceleration amplitude above the cross-over frequency
below the cross-over
frequency
2
g
m/s
n
mm
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 2,4 3,0
NOTE The values listed apply in Table 4 for cross-over frequencies between 57 Hz and 62 Hz.

7.2.4.2.4 Duration of endurance
7.2.4.2.4.1 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.
The endurance time associated with number of sweep cycles or sweep rate in octaves/minute
shall be specified. During the vibration response investigation, the specimen and the vibration
response data shall be examined in order to determine critical frequencies.
7.2.4.2.4.2 Endurance at critical frequencies
The duration of the endurance test in each axis at the critical frequencies found during the
vibration response investigation shall be chosen from the list given below. This test shall be
repeated for the number of critical frequencies as specified by the relevant specification.
10 min, 15 min, 30 min, 90 min.

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7.2.5 Evaluation


After the test, visual, dimensional and functional checks shall be performed and compared as

de
...