IEC 62715-1-1:2013

IEC 62715-1-1 ®
Edition 1.0 2013-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Flexible display devices –
Part 1-1: Terminology and letter symbols

Dispositifs flexibles d'affichage –
Partie 1-1: Terminologie et symboles littéraux

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IEC 62715-1-1 ®
Edition 1.0 2013-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Flexible display devices –
Part 1-1: Terminology and letter symbols

Dispositifs flexibles d'affichage –

Partie 1-1: Terminologie et symboles littéraux

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX J
ICS 31.120 ISBN 978-2-83221-1289-9

– 2 – 62715-1-1 © IEC:2013
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Terms and definitions . 5
2.1 Classification of terms . 5
2.2 General terms . 5
2.3 Terms related to physical properties . 6
2.4 Terms related to constructive elements . 6
2.5 Terms related to performances and specifications . 6
2.6 Terms related to the production process . 7
3 Letter symbols (quantity symbols/unit symbols) . 7
3.1 Classification . 7
3.2 Letter symbols . 8
Bibliography . 9

Table 1 – Symbols related to physical properties . 8
Table 2 – Symbols related to performances and specifications . 8

62715-1-1 © IEC:2013 － 3 －
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLEXIBLE DISPLAY DEVICES –
Part 1-1: Terminology and letter symbols

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
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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
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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 62715-1-1 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
CDV Report on voting
110/441/CDV 110/480A/RVC
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 the parts in the IEC 62715 series, under the general title Flexible display devices,
can be found on the IEC website.

– 4 – 62715-1-1 © IEC:2013
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.
62715-1-1 © IEC:2013 － 5 －
FLEXIBLE DISPLAY DEVICES –
Part 1-1: Terminology and letter symbols

1 Scope
This part of IEC 62715 gives the preferred terms, their definitions and symbols for flexible
display devices, with the object of using the same terminology when standards are prepared
in different countries.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1 Classification of terms
Terms for flexible display devices were classified as follows:
• general terms (2.2)
• terms related to physical properties (2.3)
• terms related to constructive elements (2.4)
• terms related to performances and specifications (2.5)
• terms related to the production process (2.6)
2.2 General terms
2.2.1
flexibility
mechanical pliancy to an external mechanical stress
2.2.2
flexible display device
flexible display panel and flexible module that are mechanically bendable in one or more of
the steps of substrate handling, manufacturing, storage, use, operation, shipping, and
relocation
Note 1 to entry: Preferably, flexible display devices are bendable, compliable to curved surface, rollable, or
foldable without creasing.
Note 2 to entry: Flexible display devices are generally rugged under rough handling.
2.2.3
flexible display module
flexible display device that has external drivers, optical films and other input/output interactive
films such as touch screen or sensing films
2.2.4
flexible display panel
flexible display device without external drivers
2.2.5
flexible display
product which contains flexible display modules and which is bendable for end users

– 6 – 62715-1-1 © IEC:2013
2.3 Terms related to physical properties
2.3.1
malleability
ability of flexible display devices to deform under compressive stress and to keep the
deformed shape after releasing the stress
2.3.2
flexural strength
maximum bending stress that can be applied to flexible display devices without causing any
deterioration of image quality, permanent distortion or breakage
2.3.3
flexural modulus
ratio of bending stress to the resulting strain in flexural deformation of flexible display devices
2.3.4
cyclic stress
repetitive application of an external stimulus, such as mechanical force or exposure to
temperature, to flexible display devices over time
Note 1 to entry: In case of mechanical cyclic stress, it is typically called "fatigue."
2.4 Terms related to constructive elements
2.4.1
gas barrier layer
type of passivation layer that hinders contaminants in vapour or gaseous forms, from
transmitting into the active device area
Note 1 to entry: The gas barrier layer is typically employed on substrates or directly on the active device to prevent
water or oxygen from permeating into the active device area.
2.4.2
flexible substrate
substrate with flexibility where the flexible display device is composed on, such as plastic film,
thin glass, metal foil, or paper
2.4.3
buffer layer
type of passivation layer that is inserted between the substrate and electronic elements of the
flexible display device to mitigate the defect effect on the display fabrication process and/or
the operation performance
Note 1 to entry: The buffer layer is typically employed on a thin glass substrate to hinder breakage when subject to
a bending.
2.4.4
insulation layer
type of passivation layer that electrically separates the metal foil substrate from the
conductive part of a device
Note 1 to entry: It can be applied to a substrate surface to create a smooth surface.
2.5 Terms related to performances and specifications
2.5.1
bending radius
radius of arc corresponding to the curvature of the central line between innermost and
outermost surfaces of a flexible display device during a bending test

62715-1-1 © IEC:2013 － 7 －
2.5.2
critical bending radius
minimum bending radius at which a flexible display device operate without causing any
deterioration of image quality, permanent distortion or breakage
2.5.3
strain
ratio of the amount of change in the length of a flexible display device to its original length
when an external stimulus is applied to the device
2.5.4
calcium test
Ca test
type of gas permeation test method using calcium
Note 1 to entry: The permeation rate of a substance used for the encapsulation of a display cell or the gas barrier
layer of the substrate is measured by monitoring changes in the optical transmission or electrical property of the
calcium layer. The calcium layer is degraded due to the permeation of moisture or other gases through the
substance.
Note 2 to entry: The time dependence of the calcium change process is inversely proportional to the permeation
rate.
2.6 Terms related to the production proc
...