IEC TR 62977-1-31:2021

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
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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
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