IEC 63207:2022
(Main)Measurement methods of blue light characteristics and related optical performance for visual display terminals
Measurement methods of blue light characteristics and related optical performance for visual display terminals
IEC 63207:2022 specifies measurement methods for optical performance (luminance) and blue light characteristics (BLCs) of visual display terminals (VDTs), excluding displays for outdoor use only.
Méthodes de mesure des caractéristiques de la lumière bleue et des performances optiques associées des terminaux à écran de visualisation
L'IEC 63207:2022 spécifie des méthodes de mesure des performances optiques (luminance) et des caractéristiques de la lumière bleue (BLC) des terminaux à écran de visualisation (VDT), à l'exclusion des écrans destinés exclusivement à un usage extérieur.
General Information
Standards Content (Sample)
IEC 63207
®
Edition 1.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measurement methods of blue light characteristics and related optical
performance for visual display terminals
Méthodes de mesure des caractéristiques de la lumière bleue et des
performances optiques associées des terminaux à écran de visualisation
IEC 63207:2022-09(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63207
®
Edition 1.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measurement methods of blue light characteristics and related optical
performance for visual display terminals
Méthodes de mesure des caractéristiques de la lumière bleue et des
performances optiques associées des terminaux à écran de visualisation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.120; 33.160.60; 35.180 ISBN 978-2-8322-5702-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63207:2022 © IEC 2022
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 8
4 Measurement conditions . 8
4.1 Environmental conditions . 8
4.2 Power supply . 8
4.3 Stabilized condition of VDT . 9
4.4 Light-measurement device . 9
4.4.1 Spectral radiance meter . 9
4.4.2 Luminance meter . 9
4.4.3 Illuminance meter . 9
4.5 Test settings . 9
5 Measurement method of luminance . 11
5.1 General . 11
5.2 Measurement procedure . 11
6 Measurement methods of blue light performances . 12
6.1 Blue light radiance . 12
6.1.1 General . 12
6.1.2 Methods of measurement . 12
6.2 Narrow band blue light spectrum ratio . 12
6.2.1 General . 12
6.2.2 Methods of measurement . 12
7 Test report . 13
Bibliography . 14
Figure 1 – Layout diagram of measurement setup with terminology. 10
Figure 2 – Location of test point for luminance . 11
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IEC 63207:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT METHODS OF BLUE LIGHT CHARACTERISTICS AND
RELATED OPTICAL PERFORMANCE FOR VISUAL DISPLAY TERMINALS
FOREWORD
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IEC 63207 has been prepared by technical area 2: Colour measurement and management, of
IEC technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3798/FDIS 100/3819/RVD
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 International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
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at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
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– 4 – IEC 63207:2022 © IEC 2022
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
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IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
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contents. Users should therefore print this document using a colour printer.
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IEC 63207:2022 © IEC 2022 – 5 –
INTRODUCTION
Nowadays, visual display terminals (VDTs) are everywhere in daily life, in devices such as TVs,
monitors, tablets and mobile phones. Most people will watch VDTs for a long time every day for
various reasons. However, there are three undesirable effects caused by the blue light from
VDTs.
1
The first one is a possibility of injury to human retina [1] . The energy of blue light emitting from
VDTs is weak. However, the effects of long-term exposure (30 years or more) to weak energy
from the blue light of VDTs are unknown.
The second is a disturbance to the biological (circadian) clock [2], [3]. The blue light emitted
from VDTs at night-time can also cause disturbance to the biological clock.
The third is eye strain [4], [5].
To reduce these three issues, the demand of blue-light-reduced VDTs by the market is
dramatically increasing. In consequence, the industry of VDTs comprising well-known
companies is enthusiastic in promoting blue-light-reduced VDTs. On the other hand, the
reduction of blue light will certainly have drawbacks on the visual experience.
To address the defects above under the scope of IEC TC 100, this document contributes to
developing a set of novel measurement methods for VDTs, including methods to integrate both
the considerations of luminance-independent indicators of blue light characteristics (BLCs).
NOTE This document only provides objective measurement methods for measuring BLCs of VDTs, the action of
defining threshold values or assessment methods are out of the scope of this document. If necessary, manufacturers
can define their own threshold values and/or assessment methods in accordance with this document.
___________
1
Numbers in square brackets refer to the Bibliography.
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– 6 – IEC 63207:2022 © IEC 2022
MEASUREMENT METHODS OF BLUE LIGHT CHARACTERISTICS AND
RELATED OPTICAL PERFORMANCE FOR VISUAL DISPLAY TERMINALS
1 Scope
This document specifies measurement methods for optical performance (luminance) and blue
light characteristics (BLCs) of visual display terminals (VDTs), excluding displays for outdoor
use only.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
spectral radiance (L )
λ
for a wavelength interval dλ, in a given direction at a given point, quotient of the spectral radiant
power, dΦ (λ), passing through an infinitely small area enclosing that point and propagating
λ
within the solid angle, dΩ, in the given direction, to the product of the wavelength interval, dλ,
and the area of a section of that beam on a plane perpendicular to this direction (dA cosΘ)
containing the given point and to the solid angle, dΩ
−2 −1 −1
Note 1 to entry: unit: W·m ·nm ·sr
[SOURCE: CIE S 017:2014, 17-1228]
3.1.2
blue light
portion of visible light spectrum whose wavelength range is specified between 400 nm and
500 nm
3.1.3
blue light radiance
L
Blue
radiance in which the integrated spectral radiance is in the blue light range
500
L = Ldλ
Blue e, λ
∫
400
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IEC 63207:2022 © IEC 2022 – 7 –
where:
L is spectral radiance.
e,λ
−2 −1
Note 1 to entry: Unit: W·m ·sr
3.1.4
radiance of the full white signal
L
W
radiance in which the integrated spectral radiance is in the visible radiation range
780
L = Ldλ
W e, λ
∫
380
where:
L is spectral radiance.
e,λ
−2 −1
Note 1 to entry: Unit: W·m ·sr
3.1.5
blue light radiance per luminance
R
BlueV
ratio of blue light radiance L to luminance L
Blue V
L
Blue
R =
BlueV
L
V
−1
Note 1 to entry: Unit: W·lm
3.1.6
blue light radiance per radiance of the full white signal
R
Blue
ratio of blue light radiance L to luminance L
Blue W
L
Blue
R ×100
Blue
L
W
Note 1 to entry: Unit: %
3.1.7
narrow band blue light
wavelength range of blue light portion between 415 nm and 455 nm
3.1.8
narrow band blue light radiance
L
nBlue
radiance in which the integrated spectral radiance is in the narrow band blue light range
455
L = Ldλ
nBlue e, λ
∫
415
=
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– 8 – IEC 63207:2022 © IEC 2022
where:
L is spectral radiance.
e,λ
−2 −1
Note 1 to entry: Unit: W·m ·sr
3.1.9
narrow band blue light radiance per blue light radiance
R
nBlue
ratio of narrow blue light radiance L to blue light radiance L
nBlue Blue
L
nBlue
R ×100
nBlue
L
Blue
Note 1 to entry: Unit: %
3.2 Abbreviated terms
BLC blue light characteristic
LMD light-measurement device
MF measurement field
VDT visual display terminal
4 Measurement conditions
4.1 Environmental conditions
The measurement shall be performed in a dark room and not be affected by electromagnetic
interference. If electromagnetic interference affects the results, the measurement shall be
carried out in a dark and shielded room.
The illuminance of stray light on the VDT’s screen shall be ≤ 1 lx. It means the illuminance on
the VDT’s screen shall be ≤ 1 lx when the VDT has been shut down in a dark room.
Measurements shall be carried out under the following temperature, humidity and atmospheric
pressure:
Temperature: 25 °C ± 3 °C;
Humidity: 20 %RH to 80 %RH;
Atmospheric pressure: 86 kPa to 106 kPa.
When different environmental conditions are applied, they shall be noted in the measurement
report.
4.2 Power supply
The measurement of VDTs shall be performed under rated power supply. The fluctuation of the
power supply voltage shall be no more than ±2 %. When using built-in batteries, the remaining
battery power shall be no less than 80 %; when using an AC power supply, the fluctuation of
power frequency shall be no more than ±2 %, and the fluctuation of harmonic components shall
be no more than ±5 %.
=
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IEC 63207:2022 © IEC 2022 – 9 –
4.3 Stabilized condition of VDT
To stabilize the performance of the VDT before measurement, the VDT shall be turned on for
at least 30 min (under standard environmental conditions) until repeated measurements of the
display show a variation in luminance of no more than 2 % per minute for short-term stability,
and 5 % per hour for long-term stability.
4.4 Light-measurement device
4.4.1 Spectral radiance meter
For measurement of luminance and spectral radiance of the VDT’s screen, a spot-type spectral
radiance meter shall be used. Characteristics of the spectral radiance meter are defined in
IEC 61966-4:2000.
NOTE Since there is no international/regional/national standard for imaging (2D) spectral radiance meters, an
imaging (2D) spectral radiance meter is not recommended for measurement of luminance.
4.4.2 Luminance meter
A conventional spot type luminance meter shall be also used for luminance measurement of the
VDT’s screen. However, the following characteristics shall be maintained:
a) a conventional spot-type luminance meter with a general V(λ) mismatch index f’ of less
1
than 6 %;
b) the periodical calibration shall be performed by a calibration laboratory; local regulations
can apply with regard to traceability.
NOTE Since there is no international/regional/national standard for conventional spot type luminance colorimeters,
the luminance colorimeter is not recommended for measurement of luminance.
4.4.3 Illuminance meter
The illuminance meter shall be used for measurement of stray light on the VDT’s screen. The
following characteristics shall be maintained:
a) a conventional filter-type illuminance meter with a general V(λ) mismatch index f’ (see
1
ISO/CIE 19476:2014) of less than 6 %;
b) the periodical calibration shall be performed by a calibration laboratory; local regulations
can apply with regard to traceability.
4.5 Test settings
The LMD shall be focused on the image plane of the display and generally aligned perpendicular
to the display surface at the centre of the active display area, unless stated otherwise.
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– 10 – IEC 63207:2022 © IEC 2022
Figure 1 – Layout diagram of measurement setup with terminology
When measuring matrix displays, the spectral radiance or luminance shall be measured over
500 pixels or more in the field of view of the LMD, minimizing the influence of an unusually dim
or bright pixel in the measurement area. If smaller measurement areas (< 500 pixels) are
required, photometric equivalence to 500 pixels shall be confirmed and noted in the test report.
The LMDs shall be set positioned relative to the screen of the tested VDT.
Setup for testing is shown in Figure 1 (see IEC 61747-30-1:2012).
Except the specified requirement, luminance and spectral radiance at the centre point of the
VDT tested (P , in Figure 2) shall be measured.
0
The measurement distance between the screen of the tested VDT and the nearest point of the
LMD to the screen of the tested VDT shall be 50 cm. Other specified measurement distance by
manufacturers is allowed (e.g. the measurement distance is 1,5 times the height of the screen
for 4K UHD TVs). The measurement distance shall be reported in the test report.
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IEC 63207:2022 © IEC 2022 – 11 –
Figure 2 – Location of test point for luminance
5 Measurement method of luminance
5.1 General
This measurement provides the maximum luminance of the VDT.
The luminance of the centre point of the VDT shall be measured under the full white signal.
5.2 Measurement procedure
a) Set up the VDT to be tested and an LMD. Refer to 4.5.
b) Turned on the tested VDT and the LMD.
c) Set the tested VDT to the standard states, which is the factory default setting or the setting
specified by the manufacturer.
d) Set luminance level to maximum.
e) Turn off luminaires in the room.
f) Wait for the luminance to stabilize.
g) Measure luminance L or spectral radiance L in the wavelengths between 380 nm to
V e,λ
780 nm at the position of P shown in Figure 2.
0
−2
h) If the spectral radiance meter is used, calculate luminance L (unit: cd·m or nit) using the
V
following equation (see ISO 23539/CIE S010):
780
L=K⋅⋅LV λλd
( ) (1)
V m e, λ
∫
380
where
−1
K is the maximum luminous efficacy, 683 lm･W ;
m
L is the spectral radiance;
e,λ
V(λ) is the spectral luminous efficiency for photopic vision.
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– 12 – IEC 63207:2022 © IEC 2022
6 Measurement methods of blue light performances
6.1 Blue light radiance
6.1.1 General
This measurement provides the maximum blue light luminance of the VDT under the full white
signal.
6.1.2 Methods of measurement
6.1.2.1 Measurement conditions
Refer to Clause 4.
6.1.2.2 Measurement procedure
a) Set up the VDT to be tested and a spectral radiance meter. Refer to 4.5.
b) Turned on the tested VDT and the spectral radiance meter.
c) Set the tested VDT to the standard state, which is the factory default setting or the setting
specified by the manufacturer.
d) Set luminance control to maximum.
e) Turn off luminaires in the room.
f) Wait for the luminance to stabilize.
g) Measure the spectral radiance in the wavelengths between 400 nm and 500 nm.
h) Calculate the blue light radiance L .
Blue
i) Calculate the blue light radiance per luminance R .
BlueV
6.2 Narrow band blue light spectrum ratio
6.2.1 General
The measurement and evaluation of the ratio of narrow band blue light radiance (defined in
3.1.8) over the sum of the visible spectrum range (380 nm to 780 nm) or the sum of blue
spectrum range (400 nm to 500 nm) are described.
6.2.2 Methods of measurement
6.2.2.1 Measurement procedure
a) Set up the VDT to be tested and the spectral radiance meter. Refer to 4.5.
b) Turned on the tested VDT and the spectral radiance meter.
c) Set the tested VDT to the standard state, which is the factory default setting or the setting
specified by the manufacturer.
d) Set luminance control to maximum.
e) Turn off luminaires in the room.
f) Wait for the luminance to stabilize.
g) Measure the spectral radiance in the wavelengths between 380 nm and 780 nm.
h) Calculate blue light characteristics as follows:
,
• the radiance of the full white signal, L
W
• the blue light radiance, L ,
Blue
• the narrow band blue light radiance, L ,
nBlue
• the blue light radiance per luminance, R ,
BlueV
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IEC 63207:2022 © IEC 2022 – 13 –
• the blue light radiance per radiance of the full white signal, R ,
Blue
• the narrow band blue light radiance per blue light radiance, R .
nBlue
7 Test report
The following blue light characteristics and optical performances of VDTs shall be reported. If
different conditions are applied, the conditions shall be described:
• the luminance, L ,
V
• the radiance of the full white signal, L ,
W
• the blue light radiance, L ,
Blue
• the narrow band blue light radiance, L ,
nBlue
• the blue light radiance per luminance, R ,
BlueV
• the blue light radiance per radiance of the full white signal, R ,
Blue
• the narrow band blue light radiance per blue light radiance, R .
nBlue
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– 14 – IEC 63207:2022 © IEC 2022
Bibliography
[1] Moon, J., Yun, J., Yoon, Y. D., et al. Blue light effect on retinal pigment epithelial cells
by display devices. 2017. Integrative Biology
[2] Christian C., Sylvia F., Doreen A., et al. Evening exposure to a light-emitting diodes
(LED)-backlit computer screen affects circadian physiology and cognitive performance.
2011. Journal of Applied Physiology
[3] Masahiko A., Atsuhiko H., Yusuke M., et al. Protective effect of blue-light shield eyewear
for adults against light pollution from self-luminous devices used at night. 2016.
Chronobiology International
[4] Haruo I., Apurva K.,Takuya K., et al. The Effect of Blue Light on Visual Fatigue When
Reading on LED-backlit Tablet LCDs. 2013. Proc. of the 20th International Display
Workshops (IDW’13), VHFp-9L (2013)
[5] Jonathan B. L., Blair W. G., Carl J. B., et al. Short-Wavelength Light-Blocking
Eyeglasses Attenuate Symptoms of Eye Fatigue. 2017. Investigative Ophthalmology &
Visual Science
[6] CIE S 017:2014, International lighting vocabulary
[7] IEC 61747-30-1:2012, Liquid crystal display devices – Part 30-1: Measuring methods for
liquid crystal display modules – Transmissive type
[8] IEC 61966-4:2000, Multimedia systems and equipment-Colour measurement and
managem
...
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