IEC 62715-6-22:2023

IEC 62715-6-22 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
colour
inside
Flexible display devices –
Part 6-22: Crease and waviness measurement methods
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IEC 62715-6-22 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
colour
inside
Flexible display devices –
Part 6-22: Crease and waviness measurement methods

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-6628-1

– 2 – IEC 62715-6-22:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 8
4 Standard atmospheric conditions . 8
5 Preparation of specimen for measurement . 9
5.1 General . 9
5.2 Visual examination . 9
5.3 Specimen preparation . 9
5.4 Measurement location . 12
5.4.1 General . 12
5.4.2 Crease. 12
5.4.3 Waviness . 12
6 Measurement methods . 12
6.1 General . 12
6.2 Purpose . 13
6.3 Non-contact topography . 13
6.3.1 General . 13
6.3.2 Test apparatus . 13
6.3.3 Measurement procedure . 17
6.3.4 Data analysis and report . 17
6.4 Non-contact profilometry . 20
6.4.1 General . 20
6.4.2 Test apparatus . 21
6.4.3 Measurement procedure . 22
6.4.4 Data analysis and report . 23
6.5 Contact profilometry . 24
6.5.1 General . 24
6.5.2 Test apparatus . 24
6.5.3 Measurement procedures . 26
6.5.4 Data analysis and report . 26
Bibliography . 27

Figure 1 – Step 1: Preparing the components of the specimen . 10
Figure 2 – Step 2: Turning the back of the panel to face upward . 10
Figure 3 – Step 3: Turning over the base plate and attaching it to the back of the panel . 10
Figure 4 – Step 4: Turning over the base plate with the panel attached . 11
Figure 5 – Example of measuring area . 12
Figure 6 – Example of measurement system . 14
Figure 7 – Analysis flow chart for PMD . 14
Figure 8 – Surface normal vector N, sight ray of a camera p and reflected ray r . 15
Figure 9 – Osculating circle and curvature . 16

Figure 10 – Example of data distribution in the crease measuring area . 17
Figure 11 – Example of data grouping on the vertical direction with folding axis . 18
th
Figure 12 – Example of the N profile data . 18
Figure 13 – Example of data distribution in the waviness measuring area . 19
Figure 14 – Concept of filtering profile . 20
Figure 15 – Schematic of the result of laser scanning . 21
Figure 16 – Schematic diagram of the laser scanning apparatus . 21
Figure 17 – Example of position 1 and position 2 in the crease measuring area . 23
Figure 18 – Schematic diagram of the contact profilometry apparatus . 24
Figure 19 – Schematic diagram of the motion of probe . 25

Table 1 – Example of specimen preparation condition . 11
Table 2 – Example of crease data report using the PMD method . 19
Table 3 – Example of reporting waviness data . 20
Table 4 – Example of laser scanning apparatus condition . 22
Table 5 – Example of reporting crease data by the laser scanning method . 24
Table 6 – Example of stylus condition . 25

– 4 – IEC 62715-6-22:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLEXIBLE DISPLAY DEVICES –
Part 6-22: Crease and waviness measurement methods

FOREWORD
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IEC 62715-6-22 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
110/1491/FDIS 110/1503/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 genera
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