IEC 63211-3-2:2025

IEC 63211-3-2 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
Durability test methods for electronic displays –
Part 3-2: Mechanical tests – Static stress

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IEC 63211-3-2 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
Durability test methods for electronic displays –

Part 3-2: Mechanical tests – Static stress

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120  ISBN 978-2-8327-0385-4

– 2 – IEC 63211-3-2:2025 © IEC 2025
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Standard measuring conditions . 8
4.1 Standard environmental measuring conditions . 8
4.2 Safety. 8
4.3 Number of the specimen . 8
4.4 Stress rate or strain rate . 8
4.5 Test side of a display . 8
5 Two-point bend. 9
5.1 General . 9
5.2 Apparatus . 9
5.2.1 Overview . 9
5.2.2 Face plates . 9
5.2.3 Face plate loading apparatus . 9
5.2.4 Base . 9
5.2.5 Test procedure . 10
5.2.6 Stress measurement and calculation . 10
5.3 Failure criteria . 11
6 Four-point bend . 11
6.1 General . 11
6.2 Apparatus . 12
6.2.1 Testing machine . 12
6.2.2 Test fixture and setup . 12
6.2.3 Displacement rate . 13
6.3 Procedure . 13
6.3.1 Test procedure . 13
6.3.2 Stress measurement and calculation . 14
6.4 Failure criteria . 14
7 Ring-on-ring. 14
7.1 General . 14
7.2 Apparatus . 15
7.2.1 Testing machine . 15
7.2.2 Test fixture and setup . 15
7.2.3 Loading rate . 17
7.3 Procedure . 17
7.3.1 Test procedure . 17
7.3.2 Stress measurement and calculation . 18
7.4 Failure criteria . 18
8 Point loading test . 18
8.1 General . 18
8.2 Apparatus . 18
8.3 Test procedure . 19
8.3.1 Static loading resistance . 19

8.3.2 Quasi-static failure load . 19
8.3.3 Stress measurement and calculation . 19
8.4 Failure criteria . 20
Bibliography . 21

Figure 1 – Testing apparatus for two-point bend . 10
Figure 2 – Testing apparatus for four-point bend [4] . 12
Figure 3 – Specimen configuration under four-point bending test [4] . 13
Figure 4 – Support assembly (side view, cross-section) [5] . 15
Figure 5 – Support assembly (top view) [5]. 16
Figure 6 – Load assembly (side view, cross-section) [5] . 16
Figure 7 – Load assembly (bottom view) [5] . 17
Figure 8 – Schematic of quasi-static and static point loading test [4] . 19

– 4 – IEC 63211-3-2:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DURABILITY TEST METHODS FOR ELECTRONIC DISPLAYS –

Part 3-2: Mechanical tests – Static stress

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
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IEC 63211-3-2 has been prepared by IEC technical committee 110: Electronic displays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
110/1743/FDIS 110/1761/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 63211 series, published under the general title Durability test
methods for electronic 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
– 6 – IEC 63211-3-2:2025 © IEC 2025
INTRODUCTION
The purpose of this document is to provide mechanical testing procedures for durability
evaluation of electronic displays and their components against static or quasi-static stress.
It is assumed that all tests – described in detail in individual test method standards – are
performed by personnel skilled in the general art of mechanical property tests.
This document relates to the common durability test methods applicable in the field of electronic
displays, which can overlap with some of the parts of existing IEC TC 110 documents that
describe the durability test methods of individual technologies, such as LCD, OLED, PDP and
others. This document is intended to be used as the reference document in future standards
and in revisions of existing ones. The existing standards will be revised in their maintenance
time to refer to this document to the largest extent possible.

DURABILITY TEST METHODS FOR ELECTRONIC DISPLAYS –

Part 3-2: Mechanical tests – Static stress

1 Scope
This part of IEC 63211 defines common test methods for the evaluation of the mechanical or
functional durability of electronic displays and its components against static or quasi-static
stress application. The testing methods and procedures are applicable for all the electronic
display panels, modules and components.
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 62368-1, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
specimen
individual piece of display panel, module or components to be tested
3.2
static stress
mechanical stress applied without temporal variation
3.3
quasi-static stress
stress applied at a temporal variation rate in which time or inertia effects are negligible to the
outcome of test results
3.4
strength
stress or load at which a specimen fails for a given loading condition
3.5
limit sample
sample that represents the threshold between acceptable and unacceptable samples

– 8 – IEC 63211-3-2:2025 © IEC 2025
4 Standard measuring conditions
4.1 Standard environmental measuring conditions
Mechanical and optical tests shall be carried out under the standard environmental conditions:
– temperature: 25 °C ± 3 °C
– relative humidity: 50 %RH ± 10 %RH
– atmospheric pressure: 86 kPa to 106 kPa
When different environmental conditions are used, they shall be specified in the report.
4.2 Safety
All appropriate safety equipment shall be worn during testing. Guards shall be used to protect
operators from being injured during testing. Specimen devices shall include safeguards in
accordance with IEC 62368-1.
4.3 Number of the specimen
This document applies to the displays or components. In all cases a minimum of 30 specimens
should be used to obtain a statistically significant strength distribution using Weibull analysis,
for example. At least 10 specimens shall be used for the purpose of estimating the mean. A
minimum of 30 specimens are necessary if estimates regarding the form of failure distribution
are to be reported. If the number of specimens is less than 30, a special notification shall be
stated in the report. Any specimen should be rejected prior to testing for defects considered
likely to affect the durability against static or quasi-static stress.
4.4 Stress rate or strain rate
Although the evaluation of durability against static stress is preferred, quasi-static loading
conditions can be applied instead of static condition to finish the test within a reasonable period.
However, stress or strain rate affects the test results especially for mechanical strength
evaluation. Therefore, stress and strain rate shall be determined to prevent any phenomena
caused by dynamic stress application. Stress and strain rate should be measured using strain
gauge, calculated using theoretical formula, digital image correlation or finite element analysis
and other appropriate methods. When the stress or strain rate is confirmed and well-calibrated
to be low enough, testing conditions such as crosshead travel speed and testing time may be
-4 -1
used instead. Maximum stress or strain rate should not exceed 1 × 10 s as the strain rate.
When the strain rate is difficult to measure, the maximum crosshead speed shall be equal to or
smaller than 5 mm/min.
4.5 Test side of a display
Usually, a stress test is applied to the display surface side of the device under test or to its
display components.
5 Two-point bend
5.1 General
This test evaluates the ability of the display panels, modules and components to resist the static
or quasi-static bending stresses. Bending stress should be applied to them when they are under
uniaxial load due to external loadings induced by handling, processing and fabrication of the
specimen specified as a part of the end product. Since two-point configuration generates tensile
stress along the surface and edge on concave side, mechanical or functional durability of the
display panel under such situations can be evaluated. Two-point bend is advantageous to
relatively thin and large area specimens. This test method cannot be applied to specimens that
are too rigid to bend. It is recommended that all equipment are suitably calibrated using the
predetermined method recommended for each apparatus and that records of the calibration
data and traceability are kept. The maximum dimension of the specimen applicable to this test
method should be 2 500 mm in diagonal length and 100 mm in thickness. Since the non-linearity
and the Poisson effect that may be introduced in the two-point bend testing of thin, flexible or
bendable displays, this test method shall not be applied for the display panels which are used
for foldable, bendable and rollable displays.
5.2 Apparatus
5.2.1 Overview
A schematic illustration of the test apparatus is shown in
...