IEC 62715-6-42:2026

IEC 62715-6-42 ®
Edition 1.0 2026-06
INTERNATIONAL
STANDARD
Flexible displays -
Part 6-42: Mechanical test methods - Flattening force measurement methods for
rollable display devices
ICS 31.120  ISBN 978-2-8327-1320-4

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CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms, definitions and abbreviated terms . 4
3.1 Terms and definitions . 4
3.2 Abbreviated terms. 4
4 Standard atmospheric conditions . 4
5 Measurement methods . 5
5.1 General . 5
5.2 Type A rollable display device flattening force measurement method . 5
5.2.1 Measurement equipment. 5
5.2.2 Measurement procedures for one-axis type A rollable display . 7
5.2.3 Measurement procedures for double-axis type A rollable display. 7
5.2.4 Analysis and report . 7
5.3 Type B rollable display device flattening force measurement method . 9
5.3.1 Measurement equipment. 9
5.3.2 Measurement procedures for one-axis type B rollable display . 11
5.3.3 Measurement procedures for double-axis type B rollable display. 11
5.3.4 Analysis and report . 11
Annex A (normative) Laser scanning measurement method of the arching height . 13
A.1 Measurement equipment . 13
A.2 Measurement procedure . 13

Figure 1 – Schematic diagrams of flattening force measurement equipment for type A
rollable display device . 6
Figure 2 – Example of flattening forces with different arching heights and reel turns . 8
Figure 3 – Schematic diagrams of flattening force measurement equipment for type B
rollable display device . 10
Figure 4 – Example of flattening forces with different arching heights . 12
Figure A.1 – Schematic diagrams of the laser scanning apparatus and the scan line

positions . 13

Table 1 – Example of record of the flattening forces and the arching heights for one-axis
type A rollable display device. 8
Table 2 – Example of record of the flattening force and the arching height for one-axis
type B rollable display device. 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Flexible displays -
Part 6-42: Mechanical test methods -
Flattening force measurement methods for rollable display devices

FOREWORD
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IEC 62715-6-42 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
110/1843/FDIS 110/1855/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 62715 series, published under the general title Flexible 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.
1 Scope
This part of IEC 62715 specifies the standard measurement conditions and methods for
determining the flattening force of rollable display devices when stretched to a flat state. This
document applies to display panels and modules that are rollable along a single axis or a double
axis.
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 62715-6-1:2018, Flexible display devices - Part 6-1: Mechanical test methods - Deformation
tests
3 Terms, definitions and abbreviated terms
3.1 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
3.1.1
flattening force
force required to stretch a rollable display from a crimped state to a flat state
Note 1 to entry: The display device is considered to be in a flat state when the arching height is less than a specified
value, e.g. 1 mm, which is determined by the supply and requisitioning parties.
3.1.2
rollable display
flexible display that can be rolled around a specific reel and unrolled when a larger display area is
required
3.2 Abbreviated terms
DUT device under test
4 Standard atmospheric conditions
The standard atmospheric conditions in IEC 62715-6-1:2018, Clause 4, shall apply as follows,
unless otherwise specifically agreed between customer and supplier.
– temperature: 25 °C ± 3 °C,
– relative humidity: 25 % RH to 85 % RH,
– atmospheric pressure: 86 kPa to 106 kPa.
When different environmental conditions are used, they shall be reported in detail in the
specification.
5 Measurement methods
5.1 General
The measurement methods are designed to determine the minimum force required to apply
pressure to the cross-sectional area at the end of the display when the display is flattened from
the crimped state. A rollable display device has a multi-layer film structure. As such, the material,
modulus, and rigidity of each layer of film affect the minimum force required to flatten the rollable
display. In addition, the radius of the reel is another factor that affects the flattening force. During
the use of a rollable display, it is necessary to apply tension to the flexible display device to reduce
the warpage of the surface. Therefore, this method is used to determine the minimum flattening
force that shall be applied to the cross-sectional area at the end of the flexible display device when
the device is flattened. This helps to avoid issues such as low reliability caused by excessive force
on the rollable display. According to the different rolled-up modes and the movement mechanisms
of rollable displays, this document includes measurement methods for two types of rollable
display devices. Additionally, rollable display can be broadly classified into one-axis and double-
axis design types.
NOTE 1 This document identifies two types of rollable display devices, labelled type A and type B.
NOTE 2 For a type A rollable display device, as the display device rolls back from the reel, the diameter of the reel
gradually decreases as the display device attached to the reel decreases.
NOTE 3 For a type B rollable display device, as the display device rolls back from the reel, there is no change in the
diameter of the reel since the display device only attached to a part of the reel all the time.
As the influence of the plastic and elastic force of the rollable display device itself, an arch will
appear on surface of the rollable display. In the absence of sufficient lateral tension, the arch on
the flexile display surface will affect the user's experience. However, if excessive lateral tension
is applied, the reliability of the display device for long-term use will also be affected.
Therefore, the measurement methods are used to evaluate the relationship between the arching
height
...