IEC 62341-6-2:2012

IEC 62341-6-2 ®
Edition 1.0 2012-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Organic light emitting diode (OLED) displays –
Part 6-2: Measuring methods of visual quality and ambient performance

Afficheurs à diodes électroluminescentes organiques (OLED) –
Partie 6-2: Méthodes de mesure de la qualité visuelle et des caractéristiques de
fonctionnement sous conditions ambiantes

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IEC 62341-6-2 ®
Edition 1.0 2012-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Organic light emitting diode (OLED) displays –

Part 6-2: Measuring methods of visual quality and ambient performance

Afficheurs à diodes électroluminescentes organiques (OLED) –

Partie 6-2: Méthodes de mesure de la qualité visuelle et des caractéristiques de

fonctionnement sous conditions ambiantes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 31.260 ISBN 978-2-88912-893-8

– 2 – 62341-6-2 © IEC:2012
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 9
4 Structure of measuring equipment . 9
5 Standard measuring conditions . 9
5.1 Standard measuring environmental conditions . 9
5.2 Standard lighting conditions . 10
5.2.1 Dark-room conditions . 10
5.2.2 Ambient illumination conditions . 10
5.3 Standard setup conditions . 15
5.3.1 General . 15
5.3.2 Adjustment of OLED display modules . 15
5.3.3 Starting conditions of measurements . 16
5.3.4 Conditions of measuring equipment . 16
6 Visual inspection of static images . 17
6.1 General . 17
6.2 Classification of visible defects . 17
6.2.1 Classification scheme . 17
6.2.2 Reference examples for subpixel defects . 17
6.2.3 Reference example for line defects . 19
6.2.4 Reference example for mura defects . 19
6.3 Visual inspection method and criteria . 20
6.3.1 Standard inspection conditions . 20
6.3.2 Standard inspection method . 21
6.3.3 Inspection criteria . 23
7 Electro-optical measuring methods under ambient illumination . 24
7.1 Reflection measurements . 24
7.1.1 Purpose . 24
7.1.2 Measuring conditions . 24
7.1.3 Measuring the hemispherical diffuse reflectance factor . 25
7.1.4 Measuring the reflectance factor for a directed light source . 27
7.2 Ambient contrast ratio . 29
7.2.1 Purpose . 29
7.2.2 Measuring conditions . 29
7.2.3 Measuring method . 30
7.3 Ambient display colour . 30
7.3.1 Purpose . 30
7.3.2 Measuring conditions . 30
7.3.3 Measuring method . 30
7.4 Ambient colour gamut volume . 31
7.4.1 Purpose . 31
7.4.2 Measuring conditions . 32
7.4.3 Measuring method . 32

62341-6-2 © IEC:2012 – 3 –
7.4.4 Reporting . 33
Annex A (informative)  Measuring relative photoluminescence contribution from
displays . 35
Annex B (informative) Calculation method of ambient colour gamut volume . 38
Bibliography . 44

Figure 1 – Example of visual inspection room setup for control of ambient room
lighting and reflections . 10
Figure 2 – Example of measurement geometries for diffuse illumination condition
using an integrating sphere and sampling sphere . 13
Figure 3 – Directional source measurement geometry using an isolated source . 15
Figure 4 – Directional source measurement geometry using a ring light source . 15
Figure 5 – Layout diagram of measurement set up . 16
Figure 6 – Classification of visible defects . 17
Figure 7 – Bright subpixel defects . 18
Figure 8 – Criteria for classifying bright and dark subpixel defects . 19
Figure 9 – Bright and dark line defects . 19
Figure 10 – Sample image of line mura defect associated with TFT non-uniformity . 20
Figure 11 – Example of spot mura defect in a grey background . 20
Figure 12 – Setup condition for visual inspection of electro-optical visual defects . 22
Figure 13 – Shape of scratch and dent defect . 24
Figure 14 – An example of range in colours produced by a given display as
represented by the CIELAB colour space . 33
Figure A.1 – Scaled bi-spectral photoluminescence response from a display . 36
Figure A.2 – Decomposed bi-spectral photoluminescence response from a display . 36
Figure B.1 – Analysis flow chart for calculating the colour gamut volume . 38
Figure B.2 – Graphical representation of the colour gamut volume for sRGB in the
CIELAB colour space . 39

Table 1 – Definitions for type of scratch and dent defects . 24
Table 2 – Eigenvalues M and M for CIE Daylight Illuminants D50 and D75 . 26
1 2
Table 3 – Example of minimum colours required for gamut volume calculation of a 3-
primary 8-bit display . 32
Table 4 – Measured tristimulus values for the minimum set of colours (see Table 3)
required for gamut volume calculation under the specified ambient illumination
condition .
...