IEC 62908-22-10:2024

IEC 62908-22-10 ®
Edition 1.0 2024-11
INTERNATIONAL
STANDARD
colour
inside
Touch and interactive displays –
Part 22-10: Measuring methods of fingerprint recognition performance – Under-
display optical imaging fingerprint sensing

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IEC 62908-22-10 ®
Edition 1.0 2024-11
INTERNATIONAL
STANDARD
colour
inside
Touch and interactive displays –

Part 22-10: Measuring methods of fingerprint recognition performance – Under-

display optical imaging fingerprint sensing

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120  ISBN 978-2-8327-0031-0

– 2 – IEC 62908-22-10:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 7
4 Measuring conditions . 7
4.1 Standard measuring environmental conditions . 7
4.2 Starting conditions of measurements . 8
5 Measuring system . 8
5.1 Under-display optical fingerprint recognition system . 8
5.2 Standard equipment and setup . 8
6 Measurement method of fingerprint recognition performance . 9
6.1 Fingerprint recognition system resolution . 9
6.1.1 Purpose . 9
6.1.2 Measuring conditions . 9
6.1.3 Measurement method . 10
6.1.4 Reporting . 11
6.2 SNR . 11
6.2.1 Purpose . 11
6.2.2 Measurement method . 11
6.2.3 Reporting . 12
6.3 FAR and FRR . 12
6.3.1 Purpose . 12
6.3.2 Measurement method . 12
6.3.3 Reporting . 13
Annex A (normative) Measurement method for optical parameters . 14
A.1 General . 14
A.2 Standard lighting conditions . 14
A.2.1 Darkroom conditions . 14
A.2.2 Ambient illumination conditions . 14
A.2.3 Ambient illumination spectra . 14
A.3 Standard setup conditions . 14
A.3.1 Starting conditions of measurements . 14
A.3.2 Conditions of measuring equipment . 15
A.4 Luminance . 15
A.4.1 Purpose . 15
A.4.2 Measuring equipment . 15
A.4.3 Measurement method . 16
A.4.4 Reporting . 16
A.5 Extinction ratio . 16
A.5.1 Purpose . 16
A.5.2 Measuring equipment . 16
A.5.3 Measurement method . 16
A.5.4 Reporting . 17
A.6 Light leakage ratio . 17

A.6.1 Purpose . 17
A.6.2 Measuring equipment . 17
A.6.3 Measurement method . 18
A.6.4 Reporting . 18
A.7 Luminous transmittance . 18
A.7.1 Purpose . 18
A.7.2 Measuring equipment . 19
A.7.3 Measurement method . 19
A.7.4 Reporting . 19
Bibliography . 20

Figure 1 – Structure diagram of under-display optical imaging fingerprint recognition
system . 8
Figure 2 – Flow chart of measuring system . 9
Figure 3 – Concept of performance measurement . 9
Figure 4 – Example of test target . 10
Figure 5 – Test pattern for resolution measurement . 11
Figure 6 – Example of n × n pixels block in the valley and ridge region [1] . 12
Figure A.1 – Layout diagram of measurement setup . 15
Figure A.2 – Measuring configuration for extinction ratio measurement . 17
Figure A.3 – Measuring configuration for light leakage ratio measurement . 18
Figure A.4 – Measurement configuration with light source . 19

– 4 – IEC 62908-22-10:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TOUCH AND INTERACTIVE DISPLAYS –

Part 22-10: Measurement methods of fingerprint recognition
performance – Under-display optical imaging fingerprint sensing

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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IEC 62908-22-10 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
110/1692/FDIS 110/1713/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
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A list of all parts in the IEC 62908 series, published under the general title Touch and interactive
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
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• reconfirmed,
• withdrawn, or
• revised.
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– 6 – IEC 62908-22-10:2024 © IEC 2024
TOUCH AND INTERACTIVE DISPLAYS –

Part 22-10: Measurement methods of fingerprint recognition
performance – Under-display optical imaging fingerprint sensing

1 Scope
This part of IEC 62908 specifies the standard measuring conditions and measurement methods
for determining the performance of fingerprint recognition systems with under-display optical
imaging fingerprint sensing. This document is applicable to use displays as illumination sources
of optical imaging fingerprint sensing.
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 61747-30-5, Liquid crystal display devices – Part 30-5: Optical measuring methods of
transmissive transparent LCD modules
IEC 62341-6-1, Organic light emitting diode (OLED) displays – Part 6-1: Measuring methods of
optical and electro-optical parameters
IEC 62341-6-4, Organic light emitting diode (OLED) displays – Part 6-4: Measuring methods of
transparent properties
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
optical imaging fingerprint recognition
recognition method of fingerprint by optical
image sensor located beneath the display
3.1.2
fingerprint recognition system resolution
degree of resolution of a fingerprint image
acquired by an under-display optical fingerprint recognition system, which is calculated using
the contrast transfer function (CTF)

3.1.3
contrast transfer function
CTF
ratio of the final to the initial signal
amplitude as a function of the spatial frequency of the initial signal
3.1.4
fingerprint ridge
convex part on the skin of the fingers, which makes contact with an incident surface under
normal touch
Note 1 to entry: On the fingers, the unique patterns formed by the ridges make up fingerprints.
3.1.5
fingerprint valley
area between two fingerprint ridges that does not make contact with an incident surface under
normal touch
3.1.6
signal-to-noise ratio
SNR
ratio of the required grey level of fingerprint
image to the noise grey level
3.1.7
false reject rate
FRR
proportion of verification transaction with
...