1、 IEC 62679-3-3 Edition 1.0 2016-09 INTERNATIONAL STANDARD Electronic paper displays Part 3-3: Optical measuring methods for displays with integrated lighting units IEC 62679-3-3:2016-09(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reser
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11、tegrated lighting units INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120; 31.260 ISBN 978-2-8322-3616-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62679-3-3:2016 I
12、EC 2016 CONTENTS FOREWORD . 5 1 Scope 7 2 Normative references. 7 3 Terms, definitions and abbreviated terms . 7 3.1 Terms and definitions 7 3.2 Abbreviated terms . 8 4 Standard measuring conditions 8 4.1 Standard environmental measuring conditions . 8 4.2 Viewing direction coordinate system 8 4.3 S
13、tandard lighting conditions 9 4.3.1 General comments and remarks on the measurement of electronic paper displays . 9 4.3.2 Dark room conditions . 9 4.3.3 Standard indoor ambient illumination spectra 9 4.3.4 Standard illumination geometries 10 4.4 Adjustment of the EPD 11 4.5 Standard conditions of m
14、easuring equipment . 11 4.6 Working standards and references . 11 4.7 Standard locations of measurement field . 11 4.7.1 Matrix displays . 11 4.7.2 Segment displays . 12 5 Optical measuring methods 12 5.1 Reflection measurements 12 5.1.1 General . 12 5.1.2 Measuring conditions . 12 5.1.3 Measuring t
15、he hemispherical diffuse reflectance . 13 5.1.4 Measuring the reflectance factor for a directed light source . 15 5.2 Display photometric uniformity in a dark room 16 5.2.1 Purpose . 16 5.2.2 Measuring equipment . 16 5.2.3 Measurement method . 16 5.2.4 Definitions and evaluations. 17 5.3 Dark room c
16、ontrast ratio 17 5.3.1 Purpose . 17 5.3.2 Measuring equipment . 17 5.3.3 Measurement method . 17 5.3.4 Definitions and evaluations. 17 5.4 Contrast ratio under indoor illumination 18 5.4.1 Purpose . 18 5.4.2 Measurement conditions 18 5.4.3 Measurement method . 18 5.5 Cross-talk . 19 5.5.1 Purpose .
17、19 5.5.2 Measuring equipment . 19 5.5.3 Greyscale matrix displays. 19 5.5.4 Black and white (two-level) matrix displays . 21 IEC 62679-3-3:2016 IEC 2016 3 5.6 Display colour, colour gamut, and colour gamut area . 22 5.6.1 Purpose . 22 5.6.2 Measuring equipment . 22 5.6.3 Measurement method . 22 5.6.
18、4 Display colour gamut 22 5.6.5 Display colour gamut area 23 5.7 Display colorimetric uniformity in a dark room 25 5.7.1 Purpose . 25 5.7.2 Measuring equipment . 25 5.7.3 Measurement method . 25 5.7.4 Definitions and evaluations. 26 5.8 Display colour under indoor illumination . 26 5.8.1 Purpose . 2
19、6 5.8.2 Measurement conditions 26 5.8.3 Measurement method . 27 5.8.4 Definitions and evaluations. 27 5.9 Colour gamut volume under indoor illumination 28 5.9.1 Purpose . 28 5.9.2 Measurement conditions 28 5.9.3 Measurement method . 28 5.9.4 Definitions and evaluations. 29 5.9.5 Recording 30 5.10 Vi
20、ewing direction dependence in a dark room 30 5.10.1 Purpose . 30 5.10.2 Measuring conditions . 31 5.10.3 Measuring method . 31 5.10.4 Definitions and evaluations. 31 Annex A (informative) Calculation method of daylight colour gamut volume . 34 A.1 Purpose 34 A.2 Procedure for calculating the colour
21、gamut volume 34 A.3 Surface subdivision method for CIELAB gamut volume calculation . 36 A.3.1 Purpose . 36 A.3.2 Assumptions 36 A.3.3 Algorithm . 36 A.3.4 Software example 36 Bibliography . 41 Figure 1 Representation of the coordinate system used to specify the viewing or measurement orientation . 9
22、 Figure 2 Standard measurement positions 12 Figure 3 Window pattern for cross-talk measurement 20 Figure 4 Example representation of the same primary colours in the CIE 1931 (left) and CIE 1976 (right) chromaticity diagrams . 22 Figure 5 Example of evaluation results for the colour gamut area on the
23、 a*b* plane of the CIELAB colour space 25 Figure 6 An example of the range in colours produced by an sRGB display as represented by the CIELAB colour space 29 Figure 7 - Example of contrast ratio dependence on viewing direction . 32 4 IEC 62679-3-3:2016 IEC 2016 Figure A.1 Analysis flow chart for ca
24、lculating the colour gamut volume 34 Figure A.2 Graphical representation of the colour gamut volume for sRGB in the CIELAB colour space 35 Table 1 Eigenvalues M 1and M 2for CIE daylight Illuminant D50 . 14 Table 2 Input signals for CIELAB and CIE UCS uv colour gamut area measurements 24 Table 3 Exam
25、ple data of in-plane colour non-uniformity 26 Table 4 Example of minimum colours required for gamut volume calculation of a 3- primary 8-bit display . 29 Table 5 Measured tristimulus values for the minimum set of colours (see Table 4) required for gamut volume calculation under the specified indoor
26、illumination conditions . 30 Table 6 Calculated white point in the darkened room and indoor ambient condition . 30 Table 7 Colour gamut volume in the CIELAB colour space 30 Table 8 Example format used for recording viewing direction performance 33 Table A.1 Tristimulus values of the sRGB primary col
27、ours 35 Table A.2 Example of sRGB colour set represented in the CIELAB colour space . 35 Table A.3 Example of an sRGB colour gamut volume in the CIELAB colour space . 36 IEC 62679-3-3:2016 IEC 2016 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRONIC PAPER DISPLAYS Part 3-3: Optical measuring me
28、thods for displays with integrated lighting units 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
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39、 110: Electronic display devices. The text of this standard is based on the following documents: CDV Report on voting 110/723/CDV 110/780/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been
40、drafted in accordance with the ISO/IEC Directives, Part 2. 6 IEC 62679-3-3:2016 IEC 2016 A list of all parts in the IEC 62679 series, published under the general title Electronic paper displays, can be found on the IEC website. The committee has decided that the contents of this publication will rem
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42、ssued at a later date. 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. IEC 62679-3-3:2016 IEC
43、2016 7 ELECTRONIC PAPER DISPLAYS Part 3-3: Optical measuring methods for displays with integrated lighting units 1 Scope This part of IEC 62679 specifies the standard measurement conditions and measurement methods for determining the optical performance of electronic paper display (EPD) devices whic
44、h have an operating integrated lighting unit (such as a front light). The scope of this document is restricted to EPDs using segmented or matrix structures with either monochromatic or colour type displays. The measurement methods are intended for EPDs operated in a reflective mode with the integrat
45、ed lighting unit (ILU) turned on in a dark or indoor ambient lighting environment. Colour systems beyond three primaries are not covered in this document. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requiremen
46、ts for 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 62679-1-1, Electronic paper displays Part 1-1: Terminology IEC 62679-3-1:2014, Electronic paper displays Part 3-1:
47、 Optical measuring methods IEC 61966-2-1, Multimedia systems and equipment Colour measurement and management Part 2-1: Colour management Default RGB colour space sRGB CIE 15, Colorimetry 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms
48、 and definitions given in IEC 62679-1-1, 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
49、/obp 3.1.1 ILU integrated lighting unit light source integrated into an EPD device to provide supplementary illumination to compensate for the lack of adequate ambient illumination 8 IEC 62679-3-3:2016 IEC 2016 3.1.2 ambient contrast ratio contrast ratio of a display with both hemispherical diffuse and directional illumination incident onto its surface used to simulate real lighting environments Note 1 to entry: In this document, the ambient contrast
