IEC 62977-3-7:2022

IEC 62977-3-7 ®
Edition 1.0 2022-01
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 3-7: Evaluation of optical performance – Tone characteristics
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 62977-3-7 ®
Edition 1.0 2022-01
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 3-7: Evaluation of optical performance – Tone characteristics

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-1070-7

– 2 – IEC 62977-3-7:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 9
4 Standard measuring equipment . 9
4.1 Video signal generator . 9
4.2 Measuring equipment and conditions . 10
4.3 Test equipment setup. 10
5 Standard measuring conditions . 11
5.1 Standard measuring environmental conditions . 11
5.2 Standard measuring darkroom conditions . 11
5.3 Adjustment of display . 12
5.4 Starting conditions of measurement . 12
5.5 Standard test pattern . 12
5.5.1 General . 12
5.5.2 Test pattern for grey and colour tone measurement . 13
5.5.3 Test pattern for colour saturation tone measurement . 16
6 Measurements and evaluation of tone characteristics . 16
6.1 EOTF and display gamma . 16
6.1.1 Measured data . 16
6.1.2 Measuring method . 17
6.1.3 Average gamma calculation . 18
6.1.4 Log-log gamma calculation . 20
6.1.5 Grey scale tracking accuracy . 22
6.1.6 Directional EOTF . 22
6.2 Colour saturation tone accuracy . 23
6.2.1 Measured data . 23
6.2.2 Measuring method . 23
6.2.3 Evaluation of colour saturation tone accuracy . 24
6.3 Tone additivity function . 26
6.4 Functional tone quantization . 27
6.4.1 Measuring method . 27
6.4.2 Evaluation of functional tone quantization . 28
7 Reporting. 30
7.1 Required reporting . 30
7.2 Measurement results . 31
Annex A (informative) Interlevel gamma . 32
A.1 General . 32
A.2 Interlevel gamma calculation . 33
Bibliography . 36

Figure 1 – Hue saturation lightness (HSL) colour model . 6
Figure 2 – Measuring layout for non-close-up measurement . 10

Figure 3 – Measuring layout for close-up type LMD . 10
Figure 4 – Setup for viewing directional measurements. 11
Figure 5 – RGB input ranges for 7 tones and 6 colour saturations . 13
Figure 6 – Multi-colour pattern for grey tone measurement . 14
Figure 7 – Multi-colour pattern for colour tone measurement (example for red tone) . 15
Figure 8 – Equivalent pattern for APL calculation of multi-colour pattern (example for
grey tone) . 15
Figure 9 – Multi-colour pattern for colour saturation tone measurement (example for
red saturation) . 16
Figure 10 – Example of a measured EOTF compared with ideal power law curves . 20
Figure 11 – Example of linear regression formula and plot for log-log gamma . 21
Figure 12 – Example of colour saturation tone evaluation . 25
Figure 13 – Examples of tone additivity functions for non-additive displays with (solid
line) and without (dashed line) tone clipping . 27
Figure 14 – Minimum luminance difference between neighbouring inputs . 28
Figure 15 – Graphic result for the bit depth evaluation in Table 9 . 30
Figure A.1 – Example of EOTF variation by enhancement processing . 33
Figure A.2 – Example of interlevel gamma graph . 35

Table 1 – RGB input level for 11 steps and 17 steps . 14
Table 2 – RGB input composition for grey tone and colour tone . 15
Table 3 – RGB input composition for colour saturation tone . 16
Table 4 – Selected measured data for display gamma from the 602-point measurement . 17
Table 5 – Example of average gamma calculation . 19
Table 6 – Example of log-log gamma calculation. 21
Table 7 – Selected measured data for colour saturation tone function from the 602-
point measurement . 23
Table 8 – Example of colour saturation tone evaluation (cyan saturation) . 25
Table 9 – Example of bit depth evaluation . 29
Table A.1 – Example of Interlevel gamma calculation . 34

– 4 – IEC 62977-3-7:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRONIC DISPLAYS –
Part 3-7: Evaluation of optical performance –
Tone characteristics
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
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
...