Organic light emitting diode (OLED) displays - Part 5-3: Measuring methods of image sticking and lifetime

IEC 62341-5-3:2019 is available as IEC 62341-5-3:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62341-5-3:2019 specifies the standard measuring methods for determining the image sticking and lifetime of organic light emitting diode (OLED) display panels and modules, except finalized display products for end customers, such as TV sets, monitor sets and mobile phones. The measuring method for the lifetime mainly applies to modules.
This edition includes the following significant technical changes with respect to the previous edition:
a) the measurement vehicle for lifetime is only for the module;
b) the measurement method for monitor or TV devices is modified;
c) the digital signage display is included as an example of OLED devices;
d) the measurement method with HDR (high dynamic range) for image sticking is added;
e) the analysis method with CIEDE 2000 is added for image sticking;
f) the information method for evaluating image sticking is modified.

General Information

Status
Published
Publication Date
08-Oct-2019
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
09-Oct-2019
Ref Project

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IEC 62341-5-3
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –
Part 5-3: Measuring methods of image sticking and lifetime
IEC 62341-5-3:2019-10(en)
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---------------------- Page: 2 ----------------------
IEC 62341-5-3
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –
Part 5-3: Measuring methods of image sticking and lifetime
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-7455-2

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62341-5-3:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 7

4 Measuring configuration .................................................................................................. 7

4.1 General ................................................................................................................... 7

4.2 Light measuring device ........................................................................................... 8

5 Standard measuring conditions ........................................................................................ 8

5.1 Standard measuring environmental conditions ........................................................ 8

5.2 Standard measuring darkroom conditions ............................................................... 8

5.3 Standard setup conditions ....................................................................................... 8

5.3.1 General ........................................................................................................... 8

5.3.2 Adjustment of OLED display ............................................................................ 8

5.3.3 Starting conditions of measurements ............................................................... 9

5.3.4 Test patterns ................................................................................................... 9

5.3.5 Conditions of measuring equipment ............................................................... 11

6 Measuring methods of image sticking ............................................................................ 11

6.1 Purpose ................................................................................................................ 11

6.2 Measuring method ................................................................................................ 11

6.2.1 Measuring equipment .................................................................................... 11

6.2.2 Measuring procedure ..................................................................................... 11

6.3 Analysis and report ............................................................................................... 12

6.3.1 Analysis ......................................................................................................... 12

6.3.2 Report ........................................................................................................... 14

7 Measuring methods of the luminance lifetime ................................................................ 16

7.1 Purpose ................................................................................................................ 16

7.2 Measuring method ................................................................................................ 16

7.2.1 Measuring equipment .................................................................................... 16

7.2.2 Measuring procedure ..................................................................................... 16

7.2.3 Estimation of luminance lifetime .................................................................... 17

Annex A (informative) Calculating method for equivalent signal level to reflect the

characteristics of the OLED display ...................................................................................... 19

A.1 Purpose ................................................................................................................ 19

A.2 Determining the equivalent signal level ................................................................. 19

A.2.1 General ......................................................................................................... 19

A.2.2 Calculation of the normalized luminance intensity .......................................... 19

A.2.3 Examples of extracted equivalent signal level ................................................ 22

Annex B (informative) Colour difference with CIEDE2000 .................................................... 25

B.1 Purpose ................................................................................................................ 25

B.2 Calculation of colour difference ............................................................................. 25

Bibliography .......................................................................................................................... 26

Figure 1 – Measuring system and arrangement ....................................................................... 7

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IEC 62341-5-3:2019 © IEC 2019 – 3 –

Figure 2 – Test pattern for SDR displays................................................................................. 9

Figure 3 – Image sticking measuring area ............................................................................. 10

Figure 4 – Test pattern for HDR displays .............................................................................. 11

Figure 5 – Example of the resulting image after image stress ............................................... 12

Figure 6 – Example of luminance behavior in operation for an OLED display module ............ 16

Figure 7 – Example of lifetime estimation with the extrapolation method ............................... 17

Figure 8 – Examples of estimated lifetime depending on the time elapsed ............................ 18

2 2
Figure A.1 – Measured 10 mA/cm to 80 mA/cm OLED degradation values and

corresponding modelled functions with m = 1 / 1,7 ................................................................ 20

Figure A.2 – Example of accumulated colour intensity of IEC 62087:2011 10-min video

loop in RGB subpixel format with equivalent signal distribution chart based on the left

images .................................................................................................................................. 23

Figure A.3 – Example of accumulated colour intensity of the IEC 62087:2011 10-min

video loop in W, R, G, and B format, with equivalent signal distribution chart based on

the left images ...................................................................................................................... 24

Table 1 – Examples of maximum and average code value extracted from video

samples ................................................................................................................................ 10

Table 2 – Information on test pattern .................................................................................... 14

Table 3 – Example of typical value ........................................................................................ 15

Table 4 – Reporting format of the image sticking data at target time ..................................... 15

Table 5 – Reporting format of the image sticking time with threshold .................................... 15

Table A.1 – Examples of the maximum and the average equivalent signal

levels (8 bits) ........................................................................................................................ 22

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– 4 – IEC 62341-5-3:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –
Part 5-3: Measuring methods of image sticking and lifetime
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

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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 62341-5-3 has been prepared by IEC technical committee 110:

Electronic displays.

This second edition replaces the first edition published in 2013. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) the measurement vehicle for lifetime is only for the module;
b) the measurement method for monitor or TV devices is modified;
c) the digital signage display is included as an example of OLED devices;

d) the measurement method with HDR (high dynamic range) for image sticking is added;

e) the analysis method with CIEDE 2000 is added for image sticking;
f) the information method for evaluating image sticking is modified.
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IEC 62341-5-3:2019 © IEC 2019 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
110/1134/FDIS 110/1154/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.

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.
A bilingual version of this publication may be issued at a later date.

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

contains colours which are considered to be useful for the correct
that it

understanding of its contents. Users should therefore print this document using a

colour printer.
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– 6 – IEC 62341-5-3:2019 © IEC 2019
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –
Part 5-3: Measuring methods of image sticking and lifetime
1 Scope

This part of IEC 62341 specifies the standard measuring methods for determining the image

sticking and lifetime of organic light emitting diode (OLED) display panels and modules,

except finalized display products for end customers, such as TV sets, monitor sets and mobile

phones. The measuring method for the lifetime mainly applies to modules.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60050-845, International Electrotechnical Vocabulary (IEV) – Part 845: Lighting

(available at )

IEC 62341-1-2, Organic light emitting diode (OLED) displays – Part 1-2: Terminology and

letter symbols

IEC 62341-6-1:2017, Organic light emitting diode (OLED) displays – Part 6-1: Measuring

methods of optical and electro-optical parameters
ISO 11664-1, Colorimetry – Part 1: CIE standard colorimetric observers
CIE 15, Colorimetry
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62341-1-2 and

IEC 60050-845 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
equivalent current density

average current density of a certain pixel calculated from a varying luminance per frame

image in a moving picture so that luminance degradation becomes similar at the same time

Note 1 to entry: See Annex A.
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IEC 62341-5-3:2019 © IEC 2019 – 7 –
3.1.2
equivalent signal level

digital code value from 0 to 255 (in the case of 8 bits) transformed from the normalized

luminance of a certain pixel by a specified opto-electronic transfer function (OETF)

Note 1 to entry: See Annex A.
3.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
APL average picture level
CIELAB CIE 1976(L*a*b*) colour space
DUT devices under test
EOTF electro-optical transfer function
FWHM full-width-at-half-maximum
HDR high dynamic range
LMD light measuring device
OETF opto-electronic transfer function
OLED organic light emitting diode
PQ perceptual quantizer
SDR standard dynamic range
4 Measuring configuration
4.1 General

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

with the structure specified in each item. The measuring system and its arrangement are

shown in Figure 1. The details are given in Clause 5.
Figure 1 – Measuring system and arrangement
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– 8 – IEC 62341-5-3:2019 © IEC 2019
4.2 Light measuring device

The optical properties of displays shall generally be expressed in photometric or colorimetric

units using the CIE 1931 standard colorimetric two-degree observer (see ISO 11664-1).

Luminance can be measured by a photometer, and the CIE tristimulus values (X, Y, Z) or CIE

chromaticity coordinates by a colorimeter. A spectroradiometer can also obtain photometric

and colorimetric values through a numerical conversion of the measured spectral radiance

data (see, for example, [1] ). The following requirements are given for these instruments:

The LMD shall be a luminance meter, colorimeter, or a spectroradiometer. For DUTs that

have sharp spectral peak full-width-at-half-maximums (FWHMs) smaller than 20 nm, a

spectroradiometer should be used. A filter colorimeter should generally not be used for light

sources with sharp spectral peaks. If they are used, the colorimeter shall be calibrated with a

narrow bandwidth spectroradiometer to give the same results for the specific spectrum.

Report the characteristics of the spectroradiometer which is used for calibration. For light

sources with sharp spectral peaks, the maximum bandwidth of the spectroradiometer shall be

≤ 5 nm. The higher resolution spectroradiometer produces a more accurate colour

measurement. In those cases, the wavelength accuracy shall be within ±0,5 nm. The

spectroradiometer shall be capable of measuring spectral radiance over at least the 380 nm to

780 nm wavelength range, with a maximum bandwidth of 10 nm for smooth broadband
spectra (i.e. broad spectrum with no sharp spikes).

Care shall be taken to ensure that the LMD has enough sensitivity and dynamic range to

perform the required task. Before measuring the DUT, the LMD specification shall be checked.

5 Standard measuring conditions
5.1 Standard measuring environmental conditions

The standard measuring environmental conditions specified in IEC 62341-6-1:2017, 5.1, shall

be applied. For image sticking measurements, the environmental temperature shall be

controlled at 25 °C ± 3 °C, otherwise a temperature-controlled detector shall be used. (The

stability of the LMD shall be less than 1/5 of the intended detecting difference levels of

luminance and colour.)
5.2 Standard measuring darkroom conditions

The standard measuring darkroom conditions specified in IEC 62341-6-1:2017, 5.2, shall be

applied.
5.3 Standard setup conditions
5.3.1 General

Standard setup conditions are given below. Any deviations from these conditions shall be

recorded.
5.3.2 Adjustment of OLED display

The adjustment of the OLED display specified in IEC 62341-6-1:2017, 5.3.2, shall be applied.

____________
Numbers in square brackets refer to the Bibliography.
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IEC 62341-5-3:2019 © IEC 2019 – 9 –
5.3.3 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 %/min. Repeated measurements shall be taken for a period of at least 15 min after starting.

The luminance variations shall also not exceed 5 % during the total measurement.
5.3.4 Test patterns
5.3.4.1 SDR displays

The test patterns for SDR display devices such as mobile phones, tablet PCs, monitors, TVs

and digital signage are shown in Figure 2. The test pattern for SDR displays is divided into

two groups.
1) Test pattern for mobiles and tablet PC displays

In the case of mobiles and tablet PCs, the measurement distance between the display and the

LMD depends on the size of the OLED display panels or modules. The measuring distance

and the aperture angle may be adjusted to achieve a measuring field greater than 500 pixels

if the setting of the measurement field angle is not applied. For display devices except

monitors, TVs and digital signage, the test pattern with a white level at the 4 % window box

located in the centre and a black level in the background, is used in Figure 2a).

2) Test pattern for monitors, TVs and digital signage displays

For monitors, TVs and digital signage, the test pattern is extracted by video analysis to reflect

the characteristics of the video sample. For the test pattern, the maximum code value is

allocated at the 4 % window box in the centre and the average code value is in the

background. The examples of the maximum and average gray code values are shown in

Table 1. The example of the test pattern is shown in Figure 2b). The maximum and average

code values between 0 and 255 (in the case of 8 bits) could be extracted from the

accumulating image for all frames of the video sample, which is converted as equivalent

grayscale from each colour channel.

NOTE 1 Image sticking is influenced by the characteristics of the OLED displays [5], [7]. Some manufacturers of

OLED displays apply various algorithms to optimize the quality of each device, and this also influences the image

sticking. To consider the characteristics of an OLED display, the method in Annex A is used for the test pattern

reflecting the characteristics of the OLED display.
a) Test pattern for mobiles b) Test pattern for monitors, TVs
and tablet PC displays and digital signage displays
Figure 2 – Test pattern for SDR displays
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– 10 – IEC 62341-5-3:2019 © IEC 2019

Table 1 – Examples of maximum and average code value extracted from video samples

Examples of test video Maximum code value Average code value
IEC 62087:2011 107 84
Broadcast video sample 183 102

NOTE 2 For the test pattern, any video samples could be selected as needed. Table 1 shows two kinds of

representative examples. The broadcast video sample example is constructed by considering the viewing ratio of

the content of TV programmes based on the Korea broadcast media use environmental survey report:

entertainment (30,9%), news (20,2 %), drama (16,8 %), and so on [4]. The average gray level and test pattern size

are different between SDR and HDR in TVs. Depending on the purpose of the test, Figure 2b) or Figure 4a) would

apply.
3) Measuring area

In order to get repeatability of measurement, the measuring area from P to P for displays is

0 4

set to consider the uniformity of the OLED display panels or modules, as shown in Figure 3. If

the centre window size is changed, then it should be reported in Table 2.
Figure 3 – Image sticking measuring area
4) Checking the test pattern

For SDR displays, the output luminance can be different although they have the same digital

code value inputs. To check the brief information of the selected test pattern, the output

luminance for the test pattern should be measured and reported.

Apply the test pattern on OLED displays and measure the output luminance on the measuring

area from P to P as shown in Figure 3. The results of the output luminance of the test

0 4
pattern should be reported in Table 2.
5.3.4.2 HDR displays

In 5.3.4.1, the test pattern for SDR displays is described. The test pattern for HDR displays is

shown in Figure 4a). It is based on the PQ curve and 10 bits. The test pattern for HDR

displays is proposed separately because the characteristics of the contents of the SDR and

HDR are different. The test pattern for SDR or HDR can be used as needed. The background

code value should be 510. The size of the box window should be 10 %, which is located in the

centre. The code value of the 10 % box window should be 710. The measured luminance of

the box window and the background luminance should be reported. To get repeatability of the

measurement data, the measuring area from P to P is the centre of the boxes, as shown in

0 4
Figure 4b). The measurement data should be reported in Table 2.
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IEC 62341-5-3:2019 © IEC 2019 – 11 –
a) HDR test pattern b) Measurement area
Figure 4 – Test pattern for HDR displays

NOTE The code value of the 10 % box window and background is the result of the analysed data of HDR contents

which are HDR games, drama and documentary.
5.3.5 Conditions of measuring equipment
The general conditions in IEC 62341-6-1:2017, Clause 5, shall be applied.
6 Measuring methods of image sticking
6.1 Purpose
The purpose of this method is to measure the image sticking of an OLED display.
6.2 Measuring method
6.2.1 Measuring equipment
The following equipment defined in IEC 62341-6-1:2017, 5.3.4, shall be used:
a) power supplies and signal sources for driving,
b) LMD.
6.2.2 Measuring procedure
The OLED display shall be set in darkroom conditions for measurement.
a) Initial measurements on full screen pattern

Apply a full white screen driving signal to the OLED display, and set all power supplies to the

standard operation conditions.

Measure the initial spectral radiance or tristimulus values at P to P as shown in Figure 3.

0 4

The initial spectra radiance or tristrimulus values of the primary colours may also be

measured individually.
b) Image stress using the test pattern

For image stress, the test pattern based on 5.3.4 for display devices should be applied to the

OLED display.
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– 12 – IEC 62341-5-3:2019 © IEC 2019

Keep the test pattern until the specified time, considering the luminance degradation curve.

For example, the measurement time can be every 1 h during the first 6 h, and every 24 h

during the first 120 h, then every 72 h until the target time in the standard measurement

condition. Alternatively keep the test pattern until the target time in the standard measurement

condition.
c) Measurements on full screen pattern after image stress
Before the measurement, turn off the OLED display and stabilize
...

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