IEC TR 62977-1-31:2021

Electronic displays - Part 1-31: Generic - Practical information on the use of light measuring devices

IEC TR 62977-1-31:2021(E) provides practical information on light measuring devices (luminance meters, colorimeters, and spectroradiometers) with luminance measuring optics for the characterization of electronic displays.

General Information

• Status: Published
• Publication Date: 13-Mar-2022
• ICS: 31.120 - Electronic display devices
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 13 - TC 110/WG 13
• Current Stage: PPUB - Publication issued
• Start Date: 19-May-2021
• Completion Date: 26-Apr-2021

Relations

• Amended By: IEC TR 62977-1-31:2021/AMD1:2022 - Amendment 1 - Electronic displays - Part 1-31: Generic - Practical information on the use of light measuring devices
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TR 62977-1-31 ®
Edition 1.0 2021-04
TECHNICAL
REPORT
colour
inside
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices
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 Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
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
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IEC TR 62977-1-31 ®
Edition 1.0 2021-04
TECHNICAL
REPORT
colour
inside
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-9716-2

– 2 – IEC TR 62977-1-31:2021 © IEC 2021
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 10
4 General information on LMDs for photometry and colorimetry . 10
4.1 General . 10
4.2 Photometry and colorimetry for electronic displays . 10
4.3 LMDs for luminance and chromaticity measurements . 11
4.3.1 Configuration of LMDs . 11
4.3.2 Input optics of LMDs . 13
4.3.3 Electronic system of LMDs . 13
4.3.4 Calibration of LMDs . 14
4.3.5 Maintenance of LMDs . 14
4.4 Setup conditions for measurement . 14
4.4.1 LMDs . 14
4.4.2 DUTs . 14
4.4.3 Environment . 14
5 Influence of LMD properties on luminance and chromaticity measurements . 14
5.1 General . 14
5.2 Repeatability . 15
5.2.1 General . 15
5.2.2 Example of the repeatability of an LMD. 15
5.3 Accuracy . 16
5.3.1 General . 16
5.3.2 Example of the accuracy of an LMD . 16
5.3.3 Linearity . 16
5.3.4 Range change . 17
5.4 Luminance range . 17
5.5 Spectral properties of the spectroradiometer . 17
5.5.1 General . 17
5.5.2 Wavelength accuracy and spectral bandwidth . 17
5.6 Spectral properties of the filter-type luminance meter and colorimeter . 23
5.6.1 General . 23
5.6.2 Spectral responsivity . 23
5.6.3 Methods to reduce the measurement difference . 25
5.7 Angular response of LMDs . 26
5.7.1 General . 26
5.7.2 Subtended angles . 26
5.7.3 Consideration of the input optics . 27
5.8 Measurement field . 28
5.8.1 General . 28
5.8.2 Number of pixels within the measurement field . 29
5.9 Polarization . 29

5.9.1 General . 29
5.9.2 Polarization dependence of LMDs. 30
5.10 Temporal synchronization . 31
5.10.1 General . 31
5.10.2 Temporal synchronization of the LMD and DUT . 31
6 Influence of LMD properties on measurements of the optical characteristics of
electronic displays . 32
6.1 General . 32
6.2 Contrast ratio . 32
6.2.1 General . 32
6.2.2 Calculated influence of LMD properties on the contrast ratio
measurements . 32
6.3 Electro-optical transfer function (EOTF) . 35
6.3.1 General . 35
6.3.2 Calculated influence of the LMD properties on the EOTF measurements . 35
6.4 Chromaticity gamut area . 36
6.4.1 General . 36
6.4.2 Calculated influence of LMD properties on the chromaticity gamut area
measurements . 36
6.5 Viewing direction characteristics . 38
6.5.1 General . 38
6.5.2 Calculated influence of the LMD properties on the viewing direction
characteristics measurements . 38
6.5.3 Measurement field at an oblique direction . 40
6.6 Spatial uniformity . 41
6.6.1 General . 41
6.6.2 Calculated influence of LMD properties on uniformity and non-uniformity

measurements . 41
6.7 Response time . 43
6.7.1 General . 43
6.7.2 Measurement of the response time . 43
6.8 Flicker . 46
6.8.1 General . 46
6.8.2 Measurement method of the flicker . 46
6.8.3 Low-pass filter of LMDs . 47
Annex A (informative) Photometry and colorimetry . 49
A.1 General . 49
A.2 Photometry . 49
A.3 Colorimetry . 49
A.3.1 General . 49
A.3.2 Standard colorimetric observer . 50
A.3.3 Tristimulus values . 50
A.3.4 Chromaticity diagram and colour space . 50
Annex B (informative) Method for reducing the measurement difference of
colorimeters . 53
B.1 General . 53
B.2 Matrix calibration methods for colorimeters . 53
B.2.1 Matrix calibration process 1: RGB calibration . 53
B.2.2 Matrix calibration process 2: RGBW calibration . 54

– 4 – IEC TR 62977-1-31:2021 © IEC 2021
Annex C (informative) Input data in Clause 5 and Clause 6, and calculation methods
in 5.8 and 6.5 . 56
C.1 General . 56
C.2 Characteristics of DUTs .
...

IEC TR 62977-1-31 ®
Edition 1.1 2022-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices
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.: [phone]
3, rue de Varembé [e-mail]
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: [e-mail].
IEC TR 62977-1-31 ®
Edition 1.1 2022-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-4572-9

IEC TR 62977-1-31 ®
Edition 1.1 2022-03
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices

– 2 – IEC TR 62977-1-31:2021+AMD1:2022 CSV
© IEC 2022
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
INTRODUCTION to Amendment 1 . 9
1 Scope . 10
2 Normative references . 10
3 Terms, definitions, and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 11
4 General information on LMDs for photometry and colorimetry . 11
4.1 General . 11
4.2 Photometry and colorimetry for electronic displays . 11
4.3 LMDs for luminance and chromaticity measurements . 12
4.3.1 Configuration of LMDs . 12
4.3.2 Input optics of LMDs . 15
4.3.3 Electronic system of LMDs . 15
4.3.4 Calibration of LMDs . 16
4.3.5 Maintenance of LMDs . 16
4.4 Setup conditions for measurement . 16
4.4.1 LMDs . 16
4.4.2 DUTs . 16
4.4.3 Environment . 16
5 Influence of LMD properties on luminance and chromaticity measurements . 16
5.1 General . 16
5.2 Repeatability . 17
5.2.1 General . 17
5.2.2 Example of the repeatability of an LMD. 17
5.3 Accuracy . 18
5.3.1 General . 18
5.3.2 Example of the accuracy of an LMD . 18
5.3.3 Linearity . 18
5.3.4 Range change . 19
5.4 Luminance range . 19
5.5 Spectral properties of the spectroradiometer . 19
5.5.1 General . 19
5.5.2 Wavelength accuracy and spectral bandwidth . 19
5.6 Spectral properties of the filter-type luminance meter and colorimeter . 26
5.6.1 General . 26
5.6.2 Spectral responsivity . 27
5.6.3 Methods to reduce the measurement difference . 30
5.7 Angular response of LMDs . 31
5.7.1 General . 31
5.7.2 Subtended angles . 31
5.7.3 Consideration of the input optics . 32
5.8 Measurement field . 33
5.8.1 General . 33
5.8.2 Number of pixels within the measurement field . 34

© IEC 2022
5.9 Polarization . 34
5.9.1 General . 34
5.9.2 Polarization dependence of LMDs. 35
5.10 Temporal synchronization . 36
5.10.1 General . 36
5.10.2 Temporal synchronization of the LMD and DUT . 36
6 Influence of LMD properties on measurements of the optical characteristics of
electronic displays . 37
6.1 General . 37
6.2 Contrast ratio . 37
6.2.1 General . 37
6.2.2 Calculated influence of LMD properties on the contrast ratio
measurements . 37
6.3 Electro-optical transfer function (EOTF) . 40
6.3.1 General . 40
6.3.2 Calculated influence of the LMD properties on the EOTF measurements . 40
6.4 Chromaticity gamut area . 41
6.4.1 General . 41
6.4.2 Calculated influence of LMD properties on the chromaticity gamut area
measurements . 41
6.5 Viewing direction characteristics . 43
6.5.1 General . 43
6.5.2 Calculated influence of the LMD properties on the viewing direction
characteristics measurements . 43
6.5.3 Measurement field at an oblique direction . 45
6.6 Spatial uniformity . 46
6.6.1 General . 46
6.6.2 Calculated influence of LMD properties on uniformity and non-uniformity
measurements . 46
6.7 Response time . 48
6.7.1 General . 48
6.7.2 Measurement of the response time . 48
6.8 Flicker . 51
6.8.1 General . 51
6.8.2 Measurement method of the flicker . 51
6.8.3 Low-pass filter of LMDs . 52
Annex A (informative) Photometry and colorimetry . 54
A.1 General . 54
A.2 Photometry . 54
A.3 Colorimetry . 54
A.3.1 General . 54
A.3.2 Standard colorimetric observer . 55
A.3.3 Tristimulus values . 55
A.3.4 Chromaticity diagram and colour space . 55
Annex B (informative) Method for reducing the measurement difference of
colorimeters . 58
B.1 General . 58
B.2 Matrix calibration methods for colorimeters . 58
B.2.1 Matrix calibration process 1: RGB calibration . 58
B.2.2 Matrix calibration process 2: RGBW calibration . 59

– 4 – IEC TR 62977-1-31:2021+AMD
...