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

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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
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IEC TR 62977-1-31
Edition 1.0 2022-03
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices
IEC TR 62977-1-31:2021-04/AMD1:2022-03(en)
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IEC TR 62977-1-31
Edition 1.0 2022-03
Electronic displays –
Part 1-31: Generic – Practical information on the use of light measuring devices
ICS 31.120; 31.260 ISBN 978-2-8322-1087-8

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
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– 2 – IEC TR 62977-1-31:2021/AMD1:2022
© IEC 2022
Part 1-31: Generic – Practical information
on the use of light measuring devices

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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Amendment 1 to IEC 62977-1-31:2021 has been prepared IEC technical committee 110:

Electronic displays.
The text of this Amendment is based on the following documents:
Draft Report on voting
110/1380/DTR 110/1404A/DVDTR

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 Amendment is English.
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IEC TR 62977-1-31:2021/AMD1:2022 – 3 –
© IEC 2022

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at The main document types developed by IEC are

described in greater detail at

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it

contains colours which are considered to be useful for the correct understanding of its

contents. Users should therefore print this document using a colour printer.
INTRODUCTION to Amendment 1

This document provides additional information to IEC TR 62977-1-31:2021 regarding the

influence of spectral stray light and spectral bandwidth of a spectroradiometer on chromaticity

measurements. It is described in Annex E.

This document also provides the corrections of editorial errors of IEC TR 62977-1-31:2021. The

corrections are:
– Typos are fixed:

• “fiber” and “x(λ), y(λ), z(λ)” is replaced with “fibre” and “𝑥𝑥(𝜆𝜆),𝑦𝑦(𝜆𝜆),𝑧𝑧(𝜆𝜆)”, respectively in

Figure 2,

• “(%)” in the label of vertical axis is removed in Figure 9, Figure 10, and Figure 12,

• “0” label of the tick mark of vertical axis is replaced with “1” in Figure C.4.

– The lists for Formula (A.1) and Formula (B.1) are aligned.
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– 4 – IEC TR 62977-1-31:2021/AMD1:2022
© IEC 2022
Figure 2 – Example of configurations for the input optics and detector

Replace, in Figure 2, Figure 2b) and Figure 2c) with the following new Figure 2b) and Figure

b) Colorimeter c) Spectroradiometer with spectrometer using
grating and array detector General
Replace, in NOTE 2, the fourth sentence with the following new sentence:

Experimental data demonstrating the influence of spectral stray light in a specific application are shown in Annex E

Add, after NOTE 2, the following new NOTE 3:

NOTE 3 The influence of spectral bandwidth on chromaticity measurements of narrow spectral linewidth light is

shown in Annex E.
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IEC TR 62977-1-31:2021/AMD1:2022 – 5 –
© IEC 2022
Figure 9 – Calculated chromaticity differences as a function of wavelength error
Replace Figure 9 with the following new figure:
a) DUT-1 (chromaticity coordinate, x) b) DUT-1 (chromaticity coordinate, y)
c) DUT-2 (chromaticity coordinate, x) d) DUT-2 (chromaticity coordinate, y)
e) DUT-3 (chromaticity coordinate, x) f) DUT-3 (chromaticity coordinate, y)
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– 6 – IEC TR 62977-1-31:2021/AMD1:2022
© IEC 2022

Figure 10 – Calculated chromaticity differences as a function of spectral bandwidth

Replace Figure 10 with the following new figure:
a) DUT-1 (chromati

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