1、 IEC 62715-5-1 Edition 1.0 2017-05 INTERNATIONAL STANDARD Flexible display devices Part 5-1: Measuring methods of optical performance IEC 62715-5-1:2017-05(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specifie
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10、sh to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 62715-5-1 Edition 1.0 2017-05 INTERNATIONAL STANDARD Flexible display devices Part 5-1: Measuring methods of optical performance INTERNATIONAL ELECTROTECHNICAL COMMI
11、SSION ICS 31.120 ISBN 978-2-8322-4354-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62715-5-1:2017 IEC 2017 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 8 2 Normative
12、 references 8 3 Terms, definitions and abbreviated terms 8 3.1 Terms and definitions 8 3.2 Abbreviated terms . 9 4 Structure of measuring equipment . 9 4.1 Measuring configuration Display mounting . 9 4.1.1 General . 9 4.1.2 Display mounting for uniformity measurements 10 4.1.3 Display mounting for
13、viewing direction measurements . 10 4.2 Light measuring device . 11 4.3 Light source configurations . 13 4.3.1 General . 13 4.3.2 Uniform hemispherical diffuse illumination . 13 4.3.3 Directed source illumination . 14 5 Standard measuring conditions 15 5.1 Standard measuring environmental conditions
14、 15 5.2 Standard lighting conditions 15 5.2.1 Dark room conditions . 15 5.2.2 Standard ambient illumination spectra . 15 5.2.3 Standard illumination geometries . 17 5.2.4 Diffuse reflectance standard 17 5.3 Standard setup conditions . 17 5.3.1 Adjustment of display modules 17 5.3.2 Starting conditio
15、ns of measurements . 17 5.3.3 Conditions of measuring equipment . 18 5.4 Standard locations of measurement field. 18 6 Optical measuring methods in dark room conditions 18 6.1 Luminance and its uniformity. 18 6.1.1 General . 18 6.1.2 Measuring equipment 19 6.1.3 Screen centre luminance measuring met
16、hod 19 6.1.4 Luminance uniformity measuring method . 19 6.1.5 Luminance uniformity definition and evaluation 20 6.2 Contrast ratio 20 6.2.1 General . 20 6.2.2 Measuring equipment 20 6.2.3 Measuring method . 20 6.2.4 Definition and evaluation . 20 6.3 Chromaticity, colour uniformity, and colour gamut
17、 area . 21 6.3.1 General . 21 6.3.2 Measuring equipment 21 6.3.3 Screen centre chromaticity measuring method . 21 6.3.4 Screen centre colour gamut and colour gamut area measuring method 22 IEC 62715-5-1:2017 IEC 2017 3 6.3.5 Colour uniformity measuring method 24 6.4 Peak white field correlated colou
18、r temperature 25 6.4.1 General . 25 6.4.2 Measuring equipment 25 6.4.3 Measuring method . 25 6.5 Viewing direction dependence . 25 6.5.1 General . 25 6.5.2 Measuring equipment 25 6.5.3 Measuring method . 26 6.5.4 Definition and evaluation . 27 6.6 Cross-talk with display in bent state 28 6.6.1 Gener
19、al . 28 6.6.2 Measuring equipment 28 6.6.3 Measuring method . 29 7 Optical measuring method under ambient illumination . 31 7.1 Reflection measurements 31 7.1.1 General . 31 7.1.2 Measuring conditions . 32 7.2 Ambient contrast ratio . 35 7.2.1 General . 35 7.2.2 Measuring conditions . 36 7.2.3 Measu
20、ring method . 36 7.3 Ambient display colour 36 7.3.1 General . 36 7.3.2 Measuring conditions . 37 7.3.3 Measuring method . 37 7.4 Ambient colour gamut volume . 38 7.4.1 General . 38 7.4.2 Measuring conditions . 38 7.4.3 Measuring method . 38 7.4.4 Reporting . 40 Annex A (informative) Calculation met
21、hod of ambient colour gamut volume . 42 A.1 Purpose 42 A.2 Procedure for calculating the colour gamut volume . 42 A.3 Surface subdivision method for CIELAB gamut volume calculation 44 A.3.1 Purpose . 44 A.3.2 Assumptions 44 A.3.3 Algorithm . 44 A.3.4 Software example execution 45 Bibliography 49 Fig
22、ure 1 Example of the coordinate system used for a convex display of a constant radius of curvature about the y-axis 10 Figure 2 Top view example of how a convex display can be rotated within the measurement field 10 Figure 3 Top view example of display mount that rotates in the x-z plane for viewing
23、 direction measurements 11 Figure 4 Optical characteristics of a spot photometer, colorimeter, or spectroradiometer . 12 4 IEC 62715-5-1:2017 IEC 2017 Figure 5 Example of the relationship between measurement field diameter and inclinations angles 13 Figure 6 Example of reflection measurement geometr
24、ies for spherical illumination 14 Figure 7 Example of convex display illuminated by a directed light source . 14 Figure 8 Example of convex display illuminated by a ring light source 15 Figure 9 Standard measurement positions . 18 Figure 10 Test pattern used for 4 % area window measurements . 19 Fig
25、ure 11 Examples of the colour gamut as represented in two common chromaticity diagrams . 23 Figure 12 Example of contrast ratio dependence on viewing direction 27 Figure 13 Cross-talk pattern with diagonal 4 % white window boxes on grey background . 29 Figure 14 Cross-talk pattern with diagonal 4 %
26、black window boxes on grey background . 30 Figure 15 Cross-talk pattern with perpendicular 4 % white window boxes on grey background . 30 Figure 16 Cross-talk pattern with perpendicular 4 % black window boxes on grey background . 31 Figure 17 Example of the range in colours produced by a display 40
27、Figure A.1 Analysis flow chart for calculating the colour gamut volume . 42 Figure A.2 Graphical representation of the colour gamut volume for sRGB in the CIELAB colour space 43 Table 1 Input signals for CIELAB, CIE 1931 and CIE 1976 UCS colour gamut measurements 22 Table 2 Example of CIE 1976 UCS c
28、hromaticity non-uniformity 24 Table 3 Example format used for reporting viewing direction performance . 28 Table 4 Eigenvalues M 1and M 2for CIE daylight Illuminants D50 and D75 33 Table 5 An example of minimum colours required for gamut volume calculation of a 3-primary 8-bit display 39 Table 6 Mea
29、sured tristimulus values for the minimum set of colours . 41 Table 7 Calculated white point in the dark room and ambient illumination conditions 41 Table 8 Colour gamut volume in the CIELAB colour space 41 Table A.1 Tristimulus values of the sRGB primary colours . 43 Table A.2 Example of sRGB colour
30、 set represented in the CIELAB colour space 43 Table A.3 Example of sRGB colour gamut volume in the CIELAB colour space . 44 IEC 62715-5-1:2017 IEC 2017 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FLEXIBLE DISPLAY DEVICES Part 5-1: Measuring methods of optical performance FOREWORD 1) The Internati
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41、ments 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 62715-5-1 has been prepared by IEC technical committee 110: Electronic display devices. The text of this International Standa
42、rd is based on the following documents: FDIS Report on voting 110/859/FDIS 110/870/RVD Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Direc
43、tives, Part 2. A list of all parts of the IEC 62715 series, published under the general title Flexible display devices, can be found on the IEC website. 6 IEC 62715-5-1:2017 IEC 2017 The committee has decided that the contents of this document will remain unchanged until the stability date indicated
44、 on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document 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 log
45、o 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. IEC 62715-5-1:2017 IEC 2017 7 INTRODUCTION This part of IEC 62715 was designe
46、d for the standardization of measuring methods and detailed setup conditions that are used to characterize the optical performance of flexible display devices. The surface conditions and shape of flexible displays can change depending on the application. For example, a smart watch may have a fixed c
47、onvex display, a cell phone or TV a fixed concave display, and a bendable display may have either a concave or convex shape with a variable radius of curvature. Up to now, all of these displays would usually be characterized in their flat state. However, since it is possible that mechanical stress i
48、nduced by bending the display can change its optical characteristics, the display should be measured in its designed bent state. This ensures that the displays optical performance is representative of its intended application. This document specifies the necessary conditions and methods to measure t
49、he optical performance of a display in a bent state. 8 IEC 62715-5-1:2017 IEC 2017 FLEXIBLE DISPLAY DEVICES Part 5-1: Measuring methods of optical performance 1 Scope This part of IEC 62715 specifies the standard measuring conditions and measuring methods for determining the optical performance of flexible displays in the dark or under ambient illumination. This document mainly applies to display modules that are bendable about one axis. The dis
