IEC 62341-6-1:2009

IEC 62341-6-1 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Organic light emitting diode (OLED) displays –
Part 6-1: Measuring methods of optical and electro-optical parameters

Afficheurs à diodes électroluminescentes organiques (OLED) –
Partie 6-1: Méthodes de mesure des paramètres optiques et électro-optiques

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IEC 62341-6-1 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Organic light emitting diode (OLED) displays –
Part 6-1: Measuring methods of optical and electro-optical parameters

Afficheurs à diodes électroluminescentes organiques (OLED) –
Partie 6-1: Méthodes de mesure des paramètres optiques et électro-optiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 31.260 ISBN 978-2-88910-677-6
– 2 – 62341-6-1 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms, definitions and units .6
4 Structure of measuring equipment .6
5 Standard measuring conditions.6
5.1 Standard measuring environmental conditions.6
5.2 Standard measuring dark-room conditions.6
5.3 Standard setup conditions .7
5.3.1 Adjustment of OLED display modules .7
5.3.2 Starting conditions of measurements .7
5.3.3 Conditions of measuring equipment.7
6 Measuring methods for optical parameters .8
6.1 Luminance and its uniformity.8
6.1.1 Purpose.8
6.1.2 Measuring conditions.9
6.1.3 Measuring methods .9
6.2 Dark room contrast ratio.12
6.2.1 Purpose.12
6.2.2 Measuring conditions.12
6.2.3 Measuring method .12
6.3 Chromaticity, colour uniformity, colour gamut and white field correlated
colour temperature .13
6.3.1 Purpose.13
6.3.2 Measuring conditions.13
6.3.3 Measuring method .13
7 Measuring methods for power consumption .16
7.1 Purpose .16
7.2 Measuring conditions .16
7.3 Measuring method.17
7.3.1 Measuring the power consumption of the OLED display module .17
Annex A (normative) Response time of passive matrix display panels.19
Annex B (normative) Luminance current efficiency.21
Annex C (informative) Veiling glare frustum .23
Annex D (informative) Methods to obtain the correlated colour temperature (CCT) from
chromaticity coordinates .24
Bibliography.27

Figure 1 – Layout diagram of measurement setup.8
Figure 2 – Luminance measuring pattern .10
Figure 3 – Measurement points.11
Figure 4 – Example of the colour gamut.14
Figure 5 – Colour of blackbody source at various temperatures .16
Figure 6 – Example of measurement setup of power consumption .17
Figure A.1 – Relationship between driving signal and optical response times.20

62341-6-1 © IEC:2009 – 3 –
Figure B.1 – Example of a measurement configuration for measuring luminance
current efficiency .22
Figure C.1 – Pattern for veiling glare frustum.23
Figure D.1 – CIE 1931 XYZ chromaticity diagram .25
Figure D.2 – Blackbody locus (Planckian locus) and isotemperature lines in CIE 1931 XYZ.26

Table 1 – Example of luminance non-uniformity .12
Table 2 – Example of chromaticity non-uniformity .15
Table 3 – Example of a module power consumption measurements summary sheet .18
Table D.1 – x , y , A and t for equation (D.3) and equation (D.4).24
e e i i
– 4 – 62341-6-1 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –

Part 6-1: Measuring methods of optical and electro-optical parameters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62341-6-1 has been prepared by IEC technical committee 110:
Flat panel display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/170/FDIS 110/179/RVD
Full information on the voting for the approval on this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62341-6-1 © IEC:2009 – 5 –
A list of all the parts in the IEC 62341 series, under the general title Organic Light Emitting
Diode (OLED) Displays, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 6 – 62341-6-1 © IEC:2009
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –

Part 6-1: Measuring methods of optical and electro-optical parameters

1 Scope
This part of IEC 62341 specifies the standard measurement conditions and measuring
methods for determining optical and electro-optical parameters of organic light emitting diode
(OLED) display modules, and where specified, OLED display panels, in the following areas:
a) luminance and uniformity;
b) dark room contrast ratio;
c) chromaticity, colour uniformity, colour gamut and white field correlated colour temperature;
d) power consumption.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62341-1-2, Organic light emitting diode (OLED) displays – Part 1-2: Terminology and
letter symbols
CIE 15.2:1986, Colorimetry (second edition)
CIE S 014-1/E:2006, Colorimetry – Part 1: CIE Standard Colorimetric Observers
3 Terms, definitions and units
For the purposes of this part of IEC 62341, most of the definitions and units used comply with
IEC 62341-1-2.
4 Structure of measuring equipment
The system diagrams and/or operating conditions of the measuring equipment shall comply
with the structure specified in each item.
5 Standard measuring conditions
5.1 Standard measuring environmental conditions
Measurements shall be carried out under the standard environmental conditions at a
temperature of 25 ºC ± 3 ºC, at a relative humidity of 25 % to 85 %, and pressure of 86 kPa to
106 kPa. When different environmental conditions are used, they shall be noted in the report.
5.2 Standard measuring dark-room conditions
With the OLED display turned off, the ambient illuminance at all points on the screen shall be
less than 0,3 lx. When a higher ambient illuminance on the display is present, the background

62341-6-1 © IEC:2009 – 7 –
luminance measured when the display is OFF shall be subtracted from subsequent luminance
measurements of the display, and shall be reported.
5.3 Standard setup conditions
Standard setup conditions are given below. Any deviations from these conditions shall be
reported.
5.3.1 Adjustment of OLED display modules
The luminance, contrast, correlated colour temperature of the white field, and other relevant
parameters have to be adjusted to nominal values and they shall be reported in detail in the
specifications of the measurement. For a full colour display, the chromaticity of the white field
shall also be adjusted to match the product specification. When no levels are specified, the
maximum contrast and/or luminance level shall be used and the settings reported. These
adjustments shall be held constant for all measurements, unless stated otherwise. It is
important, however, to make sure that not only the adjustments are kept constant, but also
that the resulting physical quantities remain constant during the measurement. This is not
automatically the case because of, for example, warm-up effects.
5.3.2 Starting conditions of measurements
Warm-up time is defined as the time elapsed from the moment of switching on the supply
voltage until repeated measurements of the display show a variation in luminance of less than
2 % per minute. Repeated measurements shall be taken for at least a period of 15 min after
starting. The luminance variations shall also not exceed 5 % during the total measurement.
Measurements shall be started after the OLED displays and measuring instruments achieve
stability. Sufficient warm-up time has to be allowed for the OLED displays to reach
luminescence stability.
5.3.3 Conditions of measuring equipment
5.3.3.1 General conditions
The following general conditions apply.
a) The standard measurement setup is shown in Figure 1. The light measuring device (LMD)
may be any of the following meters:
1) a luminance meter with a spectral response approximating the spectral luminous
efficiency function for photopic vision;
2) a colorimetric meter with the spectral sensitivity as colour-matching functions for the
CIE 1931 standard colorimetric observer (specified in CIE S 014-1);
3) a spectroradiometer with a wavelength range from 380 nm to 780 nm;
4) an imaging photometer or colourimeter with the spectral sensitivity as colour-matching
functions for the CIE 1931 standard colorimetric observer.
Care shall be taken to ensure that the device is capable of performing the required task.
b) The light measuring device shall be aligned perpendicular to the area to be measured on
the image generating surface of the OLED display.
c) The relative uncertainty and relative repeatability of all the measuring devices shall be
maintained by following the instrument supplier’s recommended calibration schedule.

– 8 – 62341-6-1 © IEC:2009
Acceptance
area
Luminance
Field of view
meter with
viewport
Anglar aperture
Measurement angle
Focus on object
Measurement field
being measured
IEC  614/09
Figure 1 – Layout diagram of measurement setup
d) The LMD lens shall be focused on the light emitting plane of the display, and the LMD
integration time shall be an integer number (≥10) of one frame period. Shorter integration
times are acceptable if the detector is synchronized with the display frame rate.
5.3.3.2 High pixel count matrix displays (≥320 × 240 pixels)
The following high pixel count matrix applies.
a) When measuring matrix displays, the measurement field shall include more than 500
pixels.
b) The standard measuring distance l is 2,5V (for V ≥ 20 cm) or 50 cm (for V < 20 cm),
xo
where V is the height of the display active area or the shorter of the screen width and
height dimensions. The measuring distance shall be reported.
c) The angular aperture shall be less than or equal to 5°, and measurement field angle shall
be less than or equal to 2°. The measuring distance and the measurement field angle may
be adjusted to achieve a measuring field greater than 500 pixels area if setting the above
aperture angle is difficult.
d) Displays shall be operated at their design frame frequency. When using separate driving
signal equipment to operate a panel, the drive conditions shall be reported.
5.3.3.3 Low pixel count matrix displays (<320 × 240 pixels) and segmented displays
The following low pixel count matrix applies.
a) Low pixel count displays may contain fewer than 500 pixels. When the pixel number of the
measuring field is less than 500, it shall be noted in the report. The angular aperture shall
be less than or equal to 5°, and measurement field angle shall be less than or equal to 2°.
b) For segment displays, the angular aperture shall be less than or equal to 5°, and
measurement field angle shall be less than or equal to 2°. All measurements shall be
performed at the centre of a segment with the measuring area completely contained within
the segment.
c) When the measurement conditions do not satisfy the requirement of ≤2° for the
measurement field angle, or the measurement field includes fewer than 500 pixels, the
measured values for these parameters shall be reported.
6 Measuring methods for optical parameters
6.1 Luminance and its uniformity
6.1.1 Purpose
The purpose of this method is to measure the full screen display luminance and luminance
uniformity of OLED display modules under test.

62341-6-1 © IEC:2009 – 9 –
6.1.2 Measuring conditions
The following measuring conditions apply.
a) Apparatus: A light measuring device that can measure luminance, driving power source,
and driving signal equipment.
b) Standard measuring environmental conditions; Darkroom conditions; Standard setup
conditions.
6.1.3 Measuring methods
6.1.3.1 Maximum full screen luminance
For full screen luminance proceed as follows.
a) Set the OLED display and the LMD under the standard measuring conditions.
b) Set up the measurement following the layout diagram shown in Figure 1.
c) For a monochromatic display, apply a signal to make the full screen emit at the highest
grey level. For a colour display, apply a white signal level of 100 % over the entire screen.
d) The measurement position is at the centre of the screen.
e) If luminance is measured for displays with impulse-driving or duty driving, the high peak
luminance of these displays can cause detector saturation errors. The accuracy of these
measurements can be checked by attenuating the light with a neutral density filter. If the
change in signal amplitude of the detector is proportional to the transmittance of the
neutral density filter, then there are no detector saturation errors. This method is for
measuring the maximum time-averaged full screen luminance.
f) For a segmented display, measure the luminance inside each unique colour segment
closest to the centre at its maximum signal level. The segment location measured shall be
reported.
6.1.3.2 4 % window luminance
This method shall measure the maximum time-averaged luminance of a small emitting region
in the centre of the active area. The centre luminance of a 4 % window is the maximum
window luminance.
a) Set the OLED display and the LMD under the standard measuring conditions.
b) Set up the measurement following the layout diagram shown in Figure 1.
c) Create a 4 % white window pattern on a black background in the centre of the active area,
as shown in Figure 2. The 4 % window (100 %, white screen) has corresponding sides that
are 1/5 the vertical and horizontal dimensions of the active area.
d) For a monochrome display, apply a signal at the highest grey level. For a colour display,
apply a white signal level of 100 %.
e) Measure the time-averaged luminance at the centre of the active area (position P in
Figure 3).
f) If luminance is measured for displays with impulse-driving or duty driving, the high peak
luminance of these displays can cause detector saturation errors. The accuracy of these
measurements can be checked by attenuating the light with a neutral density filter.
g) If luminance loading effects exist, reduce the area of the white window pattern and
measure the luminance in the centre. If this luminance is larger than the 4 % window
luminance, continue reducing the emitting area and take luminance measurements until
the luminance no longer increases, or the measurement area becomes too small (≤500
pixels). The maximum window luminance is the stable maximum luminance value reached
when reducing the emitting area. If no stable maximum luminance value can be obtained,
then the luminance measured with the 4 % white window pattern shall be used as the
maximum window luminance.
– 10 – 62341-6-1 © IEC:2009
Luminance
measuring
position (P )
A
2H/5 H/5
H
IEC  615/09
4 % window luminance measuring pattern

Figure 2 – Luminance measuring pattern
6.1.3.3 Sampled luminance non-uniformity
To achieve luminance non-uniformity, proceed as follows.
a) Set up the measurement following the layout diagram shown in Figure 1.
b) For a monochrome display, apply a signal to make the full screen emit at the highest grey
level. For a colour display, apply a white signal level of 100 % over the entire screen.
c) Either 5 or 9 measurement points shall be used. For 5 points, use P to P . For 9 points,
0 4
use P to P , see Figure 3.
0 8
V
2V/5
V/5
62341-6-1 © IEC:2009 – 11 –
H/2 H/10
P P P
1 5 2
P P P
8 0 6
P P P
4 7 3
H
IEC  616/09
Figure 3 – Measurement points
The average luminance is:
n
= L
i (1)
L ∑
av
()
n + 1
=0
i
where
n = 4 or 8. L is the measured luminance at location P .
i i
The luminance deviation at P is: ΔL = L - L .
i i i av
The result of measurement shall be recorded as shown in Table 1.
The luminance non-uniformity of the display is characterized as the maximum ΔL /L × 100 %.
i av
V/2
V/10
V
– 12 – 62341-6-1 © IEC:2009
Table 1 – Example of luminance non-uniformity
Measuring point Luminance L (ΔL /L ) × 100 %
i i av
cd/m
%
P 210 +1,9
P 205 –0,5
P 208 +1,0
P 199 –3,4
P 195 –5,3
P 211 +2,4
P 215 +4,4
P 204 –1,0
P 207 +0,5
2 2 2
L : 215 cd/m ; L : 195 cd/m ; Average luminance: 206 cd/m
max min
The type of driving signal shall be specified. Report the number of samples used, L , L ,
max min
and the luminance non-uniformity. Report the non-uniformity in percent to no more than three
significant figures.
6.2 Dark room contrast ratio
6.2.1 Purpose
The purpose of this method is to measure the dark-room contrast ratio (DRCR) of the OLED
display under test.
6.2.2 Measuring conditions
The following measuring conditions apply.
a) Apparatus: A light measuring device that can measure luminance; a driving power source,
and driving signal equipment.
b) Standard measuring environmental conditions; Dark-room condition; Standard setup
conditions.
6.2.3 Measuring method
6.2.3.1 Measuring method of full screen dark-room contrast ratio
For full screen dark room contrast ratio, proceed as follows.
a) Measuring luminance of a full white screen
Apply a test input signal displaying the maximum full screen luminance (100 %, white
screen) on the OLED display with the driving signal equipment. Measure the luminance
L at the centre of the screen.
DRfmax
b) Measuring luminance of a full black screen
Apply a test input signal displaying the minimum luminance (0 %, black screen) on the full
screen to the OLED display from the driving signal equipment. Measure the luminance
L at the centre of the screen.
DRfmin
c) Procedure to determine the dark-room contrast ratio
The full screen dark-room contrast ratio DRCR is given as follows:
f
L
DRf max
=
DRCR (2)
f L
DRf min
62341-6-1 © IEC:2009 – 13 –
6.2.3.2 Measuring method of 4 % window dark-room contrast ratio
For 4 % window dark room contrast ratio, proceed as follows.
a) Measurement of 4 % window luminance
Apply a test input signal to the OLED display module that generates a 4 % white window
(A ) centred on a black background. The 4 % window (100 %, white screen) has
corresponding sides that are 1/5 the vertical and horizontal dimensions of the active area
(see Figure 2). Measure the luminance at the centre of the 4 % white window (L ).
BR0,04
b) Measurement of minimum luminance
Apply a test input signal displaying the minimum full screen luminance (0 %, black screen)
on the OLED display with the driving signal equipment. Measure the luminance L at
DRmin
the centre of the screen.
c) Procedure to determine the dark-room contrast ratio
The 4 % window dark-room contrast ratio DRCR is given as follows:
w
L
DR0,04
=
DRCR (3)
w L
DR min
6.3 Chromaticity, colour uniformity, colour gamut and white field correlated colour
temperature
6.3.1 Purpose
The purpose of this method is to measure the CIE 1931 chromaticity coordinates (x, y) or CIE
1976 UCS (Uniform Colour Space) chromaticity coordinates (u′, v′), colour gamut, the colour
uniformity and the white field correlated colour temperature (CCT) of an OLED display under
test.
6.3.2 Measuring conditions
The following measuring conditions apply.
a) Apparatus: A light measuring device that can measure the chromaticity of the emitted light,
driving power source, and driving signal equipment.
b) Standard measuring environmental conditions; Darkroom condition; Standard setup
conditions.
6.3.3 Measuring method
6.3.3.1 Centre chromaticity, colour gamut and colour gamut area metric
Proceed as follows.
a) For segmented displays measure the CIE 1931 chromaticity coordinates (x, y) inside each
uniquely addressable colour segment closest to the display centre at its maximum signal
level. The segment locations measured shall be reported.
b) For monochrome displays:
Apply a signal to produce a full screen light at the highest grey level. Measure the CIE
1931 chromaticity coordinates (x, y) at the centre of the display (P ), as shown in Figure 3.
c) For colour displays:
1) Apply a full screen white signal at a 100 % grey level.
2) Measure the CIE 1931 chromaticity coordinates W(x, y) at the centre.
3) Turn on the red signal to ensure only the red light is emitting from the module.
4) Measure the chromaticity coordinates R(x, y) of the red light at the centre.
5) Turn on the green signal to ensure only the green light is emitting from the module.

– 14 – 62341-6-1 © IEC:2009
6) Measure the chromaticity coordinates G(x, y) of the green light at the centre.
7) Turn on the blue signal to ensure only the blue light is emitting from the module.
8) Measure the chromaticity coordinates B(x, y) of the blue light at the centre.
For displays with more than three primaries, repeat the measurement for each primary.
9) The colour gamut is represented by the triangle (polygon for displays with more than
three primaries) in the CIE 1931 chromaticity diagram formed by the colour points R(x,
y), G(x, y), B(x, y) as corner points. An example of measuring results is shown in
Figure 4.
′ ′
NOTE It is permitted to represent the colour gamut in the CIE 1976 UCS chromaticity coordinates u , v
using the following transformation from the CIE 1931 chromaticity coordinates x, y:
4x 9y
,  (4)
′ ′
u = v =
3 − 2x +12y 3 − 2x +12y
CIE 1931 Chromaticity Diagram
1,0
0,8
(0,22, 0,66)
G
0,6
y
0,4
W
R
(0,33, 0,33)
(0,60, 0,30)
0,2
B
(0.19, 0.13)
0,0 380
0,0 0,2 0,4 0,6 0,8
x IEC  617/09
Figure 4 – Example of the colour gamut
10) The colour gamut area metric is defined as the percent colour space area enclosed by
the colour gamut relative to the entire spectrum locus in the CIE 1976 UCS. For three-
primary displays, this is calculated as A = 256,1|(u′ -u′ )(v′ -v′ )-(u′ -u′ )(v′ -v′ )|,
R B G B G B R B
where the subscripts R, G and B refer to the red, green, and blue primaries,
respectively. For example, the colour gamut area metric for the 1953 NTSC primaries
would be 38 %, using the x, y-chromaticities Red (0,67, 0,33), Green (0,21, 0,71), and
Blue (0,14, 0,08).
NOTE For more than three-primary colour displays, centre chromaticity, colour gamut is measured according
to similar principle as RGB full-colour displays.
6.3.3.2 Sampled colour non-uniformity
Proceed as follows.
a) For a monochrome display, apply a signal to make the full screen emit at the highest grey
level. For a colour display, apply a white level of 100 % over the entire screen.

62341-6-1 © IEC:2009 – 15 –
b) The chromaticity non-uniformity is obtained by measuring the CIE 1931 chromaticity
coordinate x , y at special points P (where i is 0 to 4 or 0 to 8) on the display panel shown
i i i
in Figure 2. Either 5 or 9 measurement points shall be used. For 5 points, use P to P .
0 4
For 9 points, use P to P .
0 8
′ ′
c) Formula 4 shall be used to obtain the CIE 1976 UCS chromaticity coordinates u , v from

the CIE 1931 chromaticity coordinates x, y (both specified in CIE S 014-1).
′ ′
d) Use the CIE 1976 chromaticity coordinates u , v at each location P to determine the
i
colour difference between pairs of sampled colours using the following colour difference
equation:
2 2
′ ′ ′ ′ ′ ′
Δu v =()u − u ＋(v − v) (5)
i j i j
for i, j = 0 to 4 or i, j = 0 to 8, and i ≠ j. Colour non-uniformity is defined as the largest
sampled colour difference (Δu’v’) between any two points.
max
e) Determine the largest chromaticity difference.
The measurement results shall be recorded. An example of a 9 points measurement is
given in Table 2. The largest colour difference can be narrowed down by plotting the nine
(u’, v’) coordinates rather than calculating all (u’, v’) pairs. Report the largest chromaticity
difference to no smaller uncertainty than ±0,001.
Table 2 – Example of chromaticity non-uniformity
Δu’v’
Measuring
point x y u′ v′
P P P P P P P P P
i i i i
0 1 2 3 4 5 6 7 8
P 0,311 0,325 0,198 0,466 0,000
P 0,330 0,320 0,214 0,466 0,016 0,000
P 0,307 0,323 0,196 0,464 0,003 0,018 0,000
P 0,309 0,328 0,196 0,467 0,002 0,018 0,003 0,000
P 0,310 0,326 0,197 0,466 0,001 0,017 0,002 0,001 0,000
P 0,303 0,319 0,195 0,461 0,006 0,020 0,003 0,006 0,005 0,000
P 0,311 0,324 0,199 0,465 0,001 0,015 0,003 0,004 0,002 0,006 0,000
P 0,315 0,320 0,203 0,464 0,005 0,011 0,007 0,008 0,006 0,009 0,004 0,000
P 0,314 0,327 0,199 0,467 0,001 0,015 0,004 0,003 0,002 0,007 0,002 0,005 0,000
MaxΔu′v′ = 0,020
6.3.3.3 White field correlated colour temperature
Proceed as follows.
a) A light source whose chromaticity is closest to that of a blackbody radiator at a specific
temperature (a point on the Planckian locus) is defined to have a correlated colour
temperature (CCT) at this temperature (see Figure 5).
b) For a monochrome OLED display, apply a signal to make the full screen, emit at the
highest grey level. For a colour OLED display, apply a signal to make the full screen, emit
at 100 % white level.
If the measurement instrument does not provide the CCT directly, there are some methods
to obtain the CCT from chromaticity coordinates (see Annex D). The CCT is typically only
valid for white colours, not individual primaries.
Measure the white field colour temperature at the centre of the display.

– 16 – 62341-6-1 © IEC:2009
1,0
520 nm
0,80
550 nm
500 nm
0,60
575 nm
y
3 000 K
600 nm
0,40 5 000 K
625 nm
10 000 K
2 000 K
1 000 K
0,20
20 000 K
770 nm
0,0
0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8
x
IEC  618/09
Figure 5 – Colour of blackbody source at various temperatures
7 Measuring methods for power consumption
7.1 Purpose
The purpose of this method is to measure the power consumption of the OLED display
module under full white screen condition.
7.2 Measuring conditions
The following measuring conditions apply.
a) Apparatus: A light measuring device that can measure luminance; current meter; voltage
meter; DC power source; image signal generator.
b) Standard measuring environmental conditions; dark-room condition; standard setup
conditions.
62341-6-1 © IEC:2009 – 17 –
7.3 Measuring method
7.3.1 Measuring the power consumption of the OLED display module

Image signal
OLED display module
generator
(panel + driving circuit + control circuit)
AC/DC DC/DC DC/DC
converter converter converter
Voltmeter Voltmeter Voltmeter
Power
Ammeter Ammeter
Power source meter
P
U    (AC)
1 I I
2 3
U    (DC )
2 1
U    (DC )
3 2
GND
IEC  619/09
Figure 6 – Example of measurement setup of power consumption
Proceed as follows.
a) Make all electrical connections needed to operate the module under standard conditions.
See example setup in Figure 6.
b) Apply a full white screen driving signal to the OLED at 100 % grey level, and set all power
supplies to the standard voltage specification value. However, for some display
applications (such as video and still images), the full screen luminance can be reduced.
For example, TVs, digital camera displays and cell phone displays should use a full grey
screen at 15 %, 20 %, and 30 % of the maximum 4 % window luminance, respectively. For
display applications using a large amount of white background content, 60 % of the
maximum full screen white luminance value should be used. The luminance and grey level
value used shall be noted in the test report.
NOTE For TV applications, it is also permissible to use the video content recommended in “IEC 62087, 11.6,
to simulate TV power consumption.
c) Measure the display centre luminance following Figure 1.
d) Record all relevant power, voltage and current readings of all meters in Figure 6. See
example in Table 3.
– 18 – 62341-6-1 © IEC:2009
Table 3 – Example of a module power consumption measurements summary sheet
Voltage Current Electrical Power
Source
Power source Remarks
number
U mA mW
1 AC power source AC U _ P
1 1 1
DC power source DC U I P = U × I
1 2 2 2 2 2
DC power source DC U I P = U × I
1 3 3 3 3 3
Total Total power consumption  P = P + P + P At 100 % white level
Tot 1 2 3
e) The total module power may also be measured at other luminance levels and/or with a
uniformly distributed pattern lighting a fraction of the total pixels. It could give significantly
different results from the specified method depending on the efficiency versus luminance
curve of the display. In this case, the luminance level and fraction shall be reported.
NOTE The rated luminance and the driving signal shall be specified in the report.

62341-6-1 © IEC:2009 – 19 –
Annex A
(normative)
Response time of passive matrix display panels

A.1 Purpose
The purpose of this method is to measure the response time of the passive matrix display
panels.
A.2 Measuring conditions
The following measuring conditions apply.
a) Apparatus: Drive signal equipment that can output an invertible plain field voltage signal
(full screen white and black), a light measuring device that can produce a linear response
to rapid changes in luminance and can transform the luminance signal into an electrical
signal. The response time and sample time of the light measuring device shall be less
than one tenth the response time of the passive matrix display panel.
NOTE A signal recorder having sufficient frequency bandwidth is needed to accurately record the driving
signal.
b) Standard measuring environmental conditions; dark-room condition; standard setup
conditions.
A.3 Measuring method
Proceed as follows.
a) Connect the voltage power source to the panel and ensure that only a certain area (e.g.
5 mm × 5 mm) in the centre of the display panel can be lit when the panel is in ON state.
b) Operate the display at a steady OFF state, and then change driving voltage to make the
display skip to ON state in an instant. Measure and record the luminance-time and driving
voltage-time curves of the display by using the signal recorder, and obtain the turn-on
time t
on.
c) Operate the display at a steady ON state, and then change driving voltage to make the
display panel skip to OFF state in an instant. Measure and record the luminance-time and
driving voltage-time curves of the display panel by using the signal recorder, and obtain
the turn-off time t .
off
d) The lighted area, the response times of the light measuring device, driving voltage source,
signal recorder, and the waveform of driving voltage shall be reported.
e) As an example, the relationship between driving signal and optical response times is
shown in Figure A.1.
– 20 – 62341-6-1 © IEC:2009
100 %
90 %
10 %
0 %
t
t t
d r
t t
f
d′
t
on
t
off
On state
t
Off state
IEC  620/09
Figure A.1 – Relationship between driving signal and optical response times
Response time of the display panel includes turn-on time t and turn-off time t . The turn-on
on off
time includes turn-on delay time t and rise time t , and the turn-off time includes turn-off
d r
delay time t and fall time t .
d´ f
The turn-on time t is defined as the time interval from the moment when the off-state
on
voltage firstly skips to on-state voltage (not including the skipping time) to the moment when
the variational value of luminance reaches to 90 % of the maximum variational value. The
turn-on delay time t is defined as the time interval from the moment when the off-state
d
voltage firstly skips to on-state voltage (not including the skipping time) to the moment when
the variational value of luminance reaches 10 % of the maximum variational value. And the
rise time t is defined as the time interval between 10 % and 90 % of the maximum variational
r
value (as shown in Figure A.1).
The turn-off time t is defined as the time interval
...