IEC 62341-6-3:2012

Organic light emitting diode (OLED) displays - Part 6-3: Measuring methods of image quality

IEC 62341-6-3:2012 specifies the standard measurement conditions and measuring methods for determining image quality of organic light emitting diode (OLED) display panels and modules. More specifically, this standard focuses on five specific aspects of image quality, i.e., the viewing angle range, cross-talk, flicker, static image resolution, and moving image resolution.

Afficheurs à diodes électroluminescentes organiques (OLED) - Partie 6-3: Méthodes de mesure de la qualité des images

La CEI 62341-6-3:2012 spécifie les conditions et les méthodes de mesure normalisées pour déterminer la qualité des images des panneaux et des modules d'affichage à diode électroluminescente organique (OLED: Organic Light Emitting Diode). Plus spécifiquement, la présente norme porte sur cinq aspects spécifiques de la qualité des images, à savoir la largeur d'angle de visualisation, la diaphonie, le papillotement, la résolution des images statiques et la résolution des images animées.

General Information

• Status: Published
• Publication Date: 08-Aug-2012
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 5 - TC 110/WG 5
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 13-Nov-2017

Relations

• Revised: IEC 62341-6-3:2017 - Organic light emitting diode (OLED) displays - Part 6-3: Measuring methods of image quality
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62341-6-3


®


Edition 1.0 2012-08



INTERNATIONAL



STANDARD



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INTERNATIONALE
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Organic light emitting diode (OLED) displays –
Part 6-3: Measuring methods of image quality

Afficheurs à diodes électroluminescentes organiques (OLED) –
Partie 6-3: Méthodes de mesure de la qualité des images



IEC 62341-6-3:2012

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IEC 62341-6-3



®



Edition 1.0 2012-08







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
colour

inside










Organic light emitting diode (OLED) displays –

Part 6-3: Measuring methods of image quality




Afficheurs à diodes électroluminescentes organiques (OLED) –

Partie 6-3: Méthodes de mesure de la qualité des images

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX V


ICS 31.260 ISBN 978-2-83220-294-4



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® Registered trademark of the International Electrotechnical Commission
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CONTENTS


FOREWORD . 4

1 Scope . 6

2 Normative references . 6

3 Terms, definitions, symbols, units and abbreviations . 6

3.1 Terms, definitions, symbols and units . 6

3.2 Abbreviations . 6

4 Standard measuring equipment and coordinate system . 7
4.1 Light measuring devices . 7
4.2 Viewing direction coordinate system . 7
5 Measuring conditions . 8
5.1 Standard measuring environmental conditions . 8
5.2 Power supply . 9
5.3 Warm-up time . 9
5.4 Standard measuring dark-room conditions . 9
5.5 Standard set-up conditions . 9
6 Measuring methods of image quality . 10
6.1 Viewing angle range . 10
6.1.1 Purpose . 10
6.1.2 Measuring conditions . 10
6.1.3 Set-up . 10
6.1.4 Measurement and evaluation . 11
6.1.5 Reporting. 12
6.2 Cross-talk . 13
6.2.1 Purpose . 13
6.2.2 Measuring conditions . 13
6.2.3 Measurement and evaluation . 13
6.2.4 Reporting. 16
6.3 Flicker . 16
6.3.1 Purpose . 16
6.3.2 Measuring conditions . 16
6.3.3 Set-up . 16

6.3.4 Measuring method . 17
6.3.5 Evaluation method . 17
6.3.6 Reporting. 19
6.4 Static image resolution . 19
6.4.1 Purpose . 19
6.4.2 Measuring conditions . 20
6.4.3 Measuring method . 20
6.4.4 Calculation and reporting . 20
6.5 Moving image resolution . 21
6.5.1 Purpose . 21
6.5.2 Measuring conditions . 21
6.5.3 Temporal integration method . 23
6.5.4 Image tracking method . 25
6.5.5 Dynamic MTF calculation . 27

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62341-6-3 © IEC:2012 – 3 –


6.5.6 Reporting. 27

Annex A (informative) Simple matrix method for correction stray light of imaging

instruments . 28

Bibliography . 30




Figure 1 – Representation of the viewing direction (equivalent to the direction of

measurement) by the angle of inclination, θ and the angle of rotation (azimuth angle),

φ in a polar coordinate system . 8

Figure 2 – DUT installation conditions . 9


Figure 3 – Geometry used for measuring viewing angle range . 11
Figure 4 – Standard measurement positions, indicated by P -P , are located relative
0 8
to the height (V) and display width (H) of active area. . 13
Figure 5 – Luminance measurement of 4 % window at P . 14
0
Figure 6 – Luminance measurement at P with windows A ,A , A and A . 15
0 W1 W2 B3 B4
Figure 7 – Luminance measurement at P with windows A , A , A and A . 15
0 W5 W8 B5 B8
Figure 8 – Apparatus arrangement . 16
Figure 9 – Temporal contrast sensitivity function . 18
Figure 10 – Example of flicker modulation waveform . 18
Figure 11 – Contrast modulation measurement . 21
Figure 12 – Peak luminance and amplitude of display test signal . 23
Figure 13 – Set-up for measurement of the temporal response of the DUT . 23
Figure 14 – Sinusoidal luminance pattern and corresponding gray level values . 24
Figure 15 – Input code sequences (left) and corresponding temporal luminance
transitions (right). 25
Figure 16 – Example of captured image . 26
Figure 17 – Example of Fourier transform . 27
Figure 18 – Example of limit resolution evaluation . 27
Figure A.1 – Result of spatial stray light correction for an imaging photometer used to
measure a black spot surrounded by a large bright light source. . 29

Table 1 – Temporal contrast sensitivity function . 17

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –



Part 6-3: Measuring methods of image quality





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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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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 62341-6-3 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
110/374/FDIS 110/399/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.
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.

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62341-6-3 © IEC:2012 – 5 –


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

the stability 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.





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ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –



Part 6-3: Measuring methods of image quality








1 Scope


This part of IEC 62341 specifies the standard measurement conditions and measuring

methods for determining image quality of organic light emitting diode (OLED) display panels
and modules. More specifically, this standard focuses on five specific aspects of image quality,
i.e., the viewing angle range, cross-talk, flicker, static image resolution, and moving image
resolution.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62341-1-2:2007, Organic light emitting diode (OLED) displays – Part 1-2: Terminology
and letter symbols
CIE 015:2004, Colorimetry, 3rd Edition
ISO 11664-1/CIE S 014-1, Colorimetry – Part 1: CIE standard colorimetric observers
ISO 11664-5/CIE S 014-5, Colorimetry – Part 5: CIE 1976 L*u*v* Colour space and u', v'
uniform chromaticity scale diagram
3 Terms, definitions, symbols, units and abbreviations
3.1 Terms, definitions, symbols and units
For the purposes of this document, the terms, definitions, symbols and units given in
IEC 62341-1-2 apply.

3.2 Abbreviations
CCD Charge coupled device
CIE International Commission on Illumination
(Commission Internationale de L’Éclairage)
CFF Critrical flicker frequency
CIELAB CIE 1976 (L*a*b*) colour space
DUT Device under test
HVS Human visual system
LED Light emitting diode
LMD Light measuring device
OLED Organic light emitting diode
ppf pixels per frame

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62341-6-3 © IEC:2012 – 7 –


PSF Point spread function

RGB Red, green, blue


SLSF Spectral line spread function


4 Standard measuring equipment and coordinate system


4.1 Light measuring devices


The system configurations and/or operating conditions of the measuring equipment shall

comply with the structure specified in each item.

To ensure reliable measurements, the following requirements apply to the light measuring
equipment, listed below:
1
a) Luminance meter [1] : the instrument's spectral responsivity shall comply with the CIE
’
photopic luminous efficiency function with a CIE-f value no greater than 3 % [2]; the
1
relative luminance uncertainty of measured luminance (relative to CIE illuminant A source)
2
shall not be greater than 4 % for luminance values over 10 cd/m and not be greater than
2
10 % for luminance values 10 cd/m and below.
b) Colorimeter: the detector’s spectral responsivity shall comply with the colour matching
functions for the CIE 1931 standard colorimetric observer (as defined in
ISO 11664-1/CIE S 014-1) with a colorimetric accuracy of 0,002 for the CIE chromaticity
coordinates x and y (relative to CIE illuminant A source). A correction factor can be used
for required accuracy by application of a standard source with similar spectral distribution
as the display to be measured.
c) Spectroradiometer: the wavelength range shall be at least from 380 nm to 780 nm, and
the wavelength scale accuracy shall be less than 0,5 nm. The relative luminance
uncertainty of measured luminance (relative to CIE illuminant A source) shall not be
2
greater than 4 % for luminance values over 10 cd/m and not be greater than 10 % for
2
luminance values 10 cd/m and below. Note that errors from spectral stray light within a
spectroradiometer can be significant and shall be corrected. A simple matrix method may
be used to correct the stray light errors, by which stray light errors can be reduced for one
to two orders of magnitudes. Details of this correction method are discussed in [3].
d) Goniophotometric mechanism: the DUT or LMD can be driven rotating around a horizontal
axis and vertical axis; angle accuracy shall be better than 0,5°.
e) Imaging colorimeter: number of pixels of the detector shall not be less than 4 for each
display sub-pixel within the colorimeter's measurement field of view; more than 12 bit
digital resolution; spectral responsivity complies with colour matching functions for the
CIE 1931 standard colorimetric observer with colorimetric accuracy of 0,004 for the CIE
’
coordinates x and y, and photopic vision response function with CIE-f no greater than
1
3 %.
f) Fast-response photometer: the linearity shall be better than 0,5 % and frequency
’
response higher than 1 kHz; and photopic vision response function with CIE-f no greater
1
than 5 %.
4.2 Viewing direction coordinate system
The viewing direction is the direction under which the observer looks at the spot of interest on
the DUT (see also IEC 62341-1-2:2007, Figure A.2). During the measurement, the LMD is
replacing the observer, looking from the same direction at a specified spot (i.e. measuring
spot, measurement field) on the DUT. The viewing direction is conveniently defined by two
angles: the angle of inclination θ (related to the surface normal of the DUT) and the angle of
rotation φ (also called azimuth angle) as illustrated in Figure 1. The azimuth angle is related to
—————————
1
  Numbers in square brackets refer to the bibliography.

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the directions on a watch-dial as follows: φ = 0° is referred to as the 3 o'clock direction

("right"), φ = 90 ° as the 12 o'clock direction ("top"), φ = 180° as the 9 o'clock direction ("left")

and φ = 270 ° as the 6 o'clock direction ("bottom").



Normal direction

θ = 0°

Viewing direction
z

(θ , φ)


θ

12 o’clock
φ = 90°
Upside
y
φ
9 o’clock x′ x 3 o’clock
φ = 180° φ = 0°
Display plane
y′
Down side
6 o’clock
IEC  1573/12
z′
φ = 270°



Key
θ   incline angle from normal direction
φ   azimuth angle
3 o’clock right edge of the screen as seen from the user
6 o’clock bottom edge of the screen as seen from the user
9 o’clock left edge of the screen as seen from the user
12 o’clock top edge of the screen as seen from the user
Figure 1 – Representation of the viewing direction (equivalent to the direction of
measurement) by the angle of inclination, θ, and the angle of rotation (azimuth angle),

φ in a polar coordinate system
5 Measuring conditions
5.1 Standard measuring environmental conditions
Measurements shall be carried out under the standard environmental conditions:
• temperature:  25 ºC ± 3 ºC;
• relative humidity: 25 % RH to 85 % RH;
• atmospheric pressure: 86 kPa to 106 kPa.
When different environmental conditions are used, they shall be noted in the measurement
report.

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62341-6-3 © IEC:2012 – 9 –


5.2 Power supply


The power supply for driving the DUT shall be adjusted to the rated voltage ± 0,5 %. In

addition, the frequency of power supply shall provide the rated frequency ± 0,2 %.


5.3 Warm-up time


Measurements shall be carried out after sufficient warm-up. Warm-up time is defined as the

time elapsed from when the supply source is switched on, and a 100 % gray level of input
signal is applied to the DUT, until repeated measurements of the display show a variation in

luminance of no more than 2 % per minute and 5 % per hour.


5.4 Standard measuring dark-room conditions
The luminance contribution from the background illumination reflected off the test display
2
shall be < 0,01 cd/m or less than 1/20 the display’s black state luminance, whichever is lower.
If these conditions are not satisfied, then background subtraction is required and it shall be
noted in the measurement report. In addition, if the sensitivity of the LMD is inadequate to
measure these low levels, then the lower limit of the LMD shall be noted in the measurement
report.
5.5 Standard set-up conditions
By default, the display shall be installed in the vertical position (Figure 2a), but the horizontal
alternative (Figure 2b) is also allowed. When the latter alternative is used, it shall be noted in
the measurement report.
Luminance, contrast and chromaticity of the white field and other relevant parameters of the
displays have to be adjusted to nominal status in the detailed specification and they shall be
noted in the measurement report. When there is no level specified, the maximum contrast
and/or luminance level shall be used. These adjustments shall be held constant for all
measurements, unless noted otherwise in the measurement report. Additional conditions are
specified separately for each measuring method.

12 o’clock
φ = 90°
θ = 0°
LMD
y
Vertical
12 o’clock
z
φ = 90°
Vertical
9 o’clock
(normal) y
φ = 180°
Horizontal
9 o’clock
Horizontal
φ = 180°

x
3 o’clock
x
Normal
φ = 0°
3 o’clock
z
φ = 0°
LMD
θ = 0°
6 o’clock
6 o’clock
φ = 270°
φ = 270°
IEC  1574/12 IEC  1575/12



Figure 2a – Primary installation Figure 2b – Alternative installation
Figure 2 – DUT installation conditions

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6 Measuring methods of image quality


6.1 Viewing angle range


6.1.1 Purpose


The purpose of this method is to measure the viewing angle range of an OLED display module

in the horizontal (φ = 0˚, φ = 180˚) and vertical (φ = 90˚, φ = 270˚) viewing direction. Different

evaluation criteria are described with which the viewing angle range can be determined.

Several studies [4 – 8] have indicated that the contrast ratio (CR > 10:1) is, from a visual
quality point of view, not very useful to determine the viewing angle range for matrix displays.

When colour differences are included in a viewing angle metric, the correlation between the

metric value and a visual assessment value is significantly increased [9]. A more recent study

[10] revealed that a metric, combining viewing angle related luminance degradation and colour
deviation can accurately predict the relative change in visual assessment value. This
information is the basis for the determination of the image quality based viewing angle range,

which has relevance from a visual quality point of view.
6.1.2 Measuring conditions
Standard measuring is implemented under standard d
...