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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
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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 .
...