IEC 62341-6-4:2017

IEC 62341-6-4 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –
Part 6-4: Measuring methods of transparent properties
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IEC 62341-6-4 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Organic light emitting diode (OLED) displays –

Part 6-4: Measuring methods of transparent properties

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-4297-1

– 2 – IEC 62341-6-4:2017  IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Measuring conditions . 7
4.1 Standard measuring environmental conditions . 7
4.2 Standard lighting conditions . 7
4.2.1 Darkroom conditions . 7
4.2.2 Ambient illumination conditions . 7
4.2.3 Ambient illumination spectra . 8
4.3 Standard setup conditions . 8
4.3.1 Starting conditions of measurements . 8
4.3.2 Conditions of measuring equipment . 9
5 Measuring methods of transparent properties . 10
5.1 Measuring methods of transmission performance . 10
5.1.1 Hemispherical transmittance factor with specular included . 10
5.1.2 Transmitted haze under hemispherical illumination . 12
5.1.3 Directional transmittance factor . 14
5.1.4 Measurement method of purity . 16
5.1.5 Colour variation caused by a transparent display . 19
5.2 Measuring methods of on-screen performance in a darkroom. 20
5.2.1 Luminance and its uniformity . 20
5.2.2 Chromaticity and colour non-uniformity . 23
5.2.3 Darkroom contrast ratio . 24
5.2.4 Grey scale and gamma characteristics . 25
5.2.5 Colour gamut . 27
5.2.6 Directional optical characteristics . 29
6 Measuring methods of reflection properties . 30
6.1 Hemispherical reflectance factor with specular included . 30
6.1.1 Purpose . 30
6.1.2 Measuring conditions . 30
6.1.3 Measuring method . 30
6.2 Directional reflectance factor . 31
6.2.1 Purpose . 31
6.2.2 Measuring conditions . 31
6.2.3 Measuring method . 31
7 Optical on-screen performance under ambient illumination . 31
7.1 Ambient contrast ratio . 31
7.1.1 Purpose . 31
7.1.2 Measuring conditions . 32
7.1.3 Measuring method . 32
7.2 Display ambient colour measurement . 33
7.2.1 Purpose . 33
7.2.2 Measuring conditions . 33
7.2.3 Measuring method . 34

Annex A (normative) Alternative method for measuring the hemispherical
transmittance factor of a transparent OLED display . 36
A.1 Purpose . 36
A.2 Measuring conditions . 36
A.3 Measuring the transmittance . 36
Bibliography . 39

Figure 1 – Layout diagram of measurement setup . 9
Figure 2 – Side view of measuring concept for the hemispherical transmittance factor
measurement with specular included or excluded . 12
Figure 3 – Schematic arrangement of haze measurement . 14
Figure 4 – Side view of measuring concept for the hemispherical transmittance factor
measurement with specular included or excluded . 16
Figure 5 – Measuring configuration for purity measurement . 18
Figure 6 – Test patterns for purity measurement . 18
Figure 7 – Test pattern for 4 % window luminance . 21
Figure 8 – Example of luminance loading measurement . 22
Figure 9 – Measurement locations . 23
Figure 10 – Measuring patterns for gamma measurement . 26
Figure A.1 – Measurement geometry using a sampling sphere . 37

Table 1 – Standard ambient conditions . 8
Table 2 –Measuring conditions of the ports . 14
Table 3 – Measured example for purity . 19
Table 4 – Working example for colour variation index . 20
Table 5 – Worked example for luminance loading . 22
Table 6 – Example of luminance non-uniformity . 23
Table 7 – Example of colour uniformity measurement . 24
Table 8 – Example of gamma measurement . 26
Table 9 – Reference areas for the colour reproduction range . 28
Table 10 – Example of measurement for the colour gamut variation ratio . 28
Table 11 – Example of measurement for the directional electro-optical characteristic . 30

– 4 – IEC 62341-6-4:2017  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS –

Part 6-4: Measuring methods of transparent properties

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