SIST EN 62341-6-3:2012

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

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.

Anzeigen mit organischen Leuchtdioden (OLEDs) - Teil 6-3: Messverfahren für Bildqualität

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.

Prikazovalniki z organskimi svetlečimi diodami (OLED) - 6-3. del: Merilne metode za kakovost slike

Ta del standarda IEC 62341 določa standardne merilne pogoje in merilne metode za ugotavljanje kakovosti slike prikazovalnih modulov in plošč z organskimi svetlečimi diodami (OLED). Bolj natančno, ta standard se osredotoča na pet specifičnih vidikov kakovosti slike, na primer na širino vidnega kota, presluhov, utripanja, ločljivosti statične slike in premikajoče slike.

General Information

• Status: Published
• Publication Date: 16-Oct-2012
• ICS: 31.120 - Electronic display devices
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Oct-2012
• Due Date: 17-Dec-2012
• Completion Date: 17-Oct-2012
• Ref Project: EN 62341-6-3:2012 - Organic light emitting diode (OLED) displays - Part 6-3: Measuring methods of image quality

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62341-6-3:2012
01-december-2012
3ULND]RYDOQLNL]RUJDQVNLPLVYHWOHþLPLGLRGDPL2/('GHO0HULOQHPHWRGH
]DNDNRYRVWVOLNH
Organic light emitting diode (OLED) displays - Part 6-3: Measuring methods of image
quality
Anzeigen mit organischen Leuchtdioden (OLEDs) - Teil 6-3: Messverfahren für
Bildqualität
Afficheurs à diodes électroluminescentes organiques (OLED) - Partie 6-3: Méthodes de
mesure de la qualité des images
Ta slovenski standard je istoveten z: EN 62341-6-3:2012
ICS:
31.120 Elektronske prikazovalne Electronic display devices
naprave
SIST EN 62341-6-3:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62341-6-3:2012

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SIST EN 62341-6-3:2012

EUROPEAN STANDARD
EN 62341-6-3

NORME EUROPÉENNE
September 2012
EUROPÄISCHE NORM

ICS 31.260


English version


Organic light emitting diode (OLED) displays -
Part 6-3: Measuring methods of image quality
(IEC 62341-6-3:2012)


Afficheurs à diodes électroluminescentes Anzeigen mit organischen Leuchtdioden
organiques (OLED) - (OLEDs) -
Partie 6-3: Méthodes de mesure de la Teil 6-3: Messverfahren für Bildqualität
qualité des images (IEC 62341-6-3:2012)
(CEI 62341-6-3:2012)





This European Standard was approved by CENELEC on 2012-09-13. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62341-6-3:2012 E

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SIST EN 62341-6-3:2012
EN 62341-6-3:2012 - 2 -
Foreword
The text of document 110/374/FDIS, future edition 1 of IEC 62341-6-3, prepared by IEC/TC 110, "Flat
panel display devices", was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN 62341-6-3:2012.

The following dates are fixed:
(dop) 2013-06-13
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-09-13
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 62341-6-3:2012 was approved by CENELEC as a European
Standard without any modification.

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SIST EN 62341-6-3:2012
- 3 - EN 62341-6-3:2012
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 62341-1-2 2007 Organic light emitting diode displays - EN 62341-1-2 2009
Part 1-2: Terminology and letter symbols


CIE 15 2004 Colorimetry - -


ISO 11664-1/ - Colorimetry - - -
CIE S 014-1 Part 1: CIE standard colorimetric observers


ISO 11664-5 - Colorimetry - - -
CIE S 014-5 Part 5: CIE 1976 L*u*v* Colour space and u',
v' uniform chromaticity scale diagram

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SIST EN 62341-6-3:2012

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SIST EN 62341-6-3:2012




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



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

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SIST EN 62341-6-3:2012
– 2 – 62341-6-3 © IEC:2012
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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SIST EN 62341-6-3:2012
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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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 62341-6-3 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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SIST EN 62341-6-3:2012
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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.

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SIST EN 62341-6-3:2012
– 6 – 62341-6-3 © IEC:2012
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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SIST EN 62341-6-3:2012
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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SIST EN 62341-6-3:2012
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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SIST EN 62341-6-3:2012
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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 st
...