IEC_62595-2-1-2016.pdf

IEC 62595-2-1 Edition 1.0 2016-04 INTERNATIONAL STANDARD Display lighting unit Part 2-1:Electro-optical measuring methods of LED back light unit IEC 62595-2-1:2016-04(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch A bout the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical infor mation on IEC Inter national Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Andr oid Tablets and iPad.IEC publications search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criter ia(r efer ence number,text,technical committee,).It also gives information on pr ojects,replaced and w ithdr awn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and also once a month by email.Electropedia-www.electropedia.org The w or lds leading online dictionary of electronic and electr ical terms containing 20 000 ter ms and definitions in English and French,w ith equivalent terms in 15 additional languages.Also k now n as the International Electr otechnical Vocabulary (IEV)online.IEC Glossary -std.iec.ch/glossary 65 000 electrotechnical ter minology entr ies in English and French extr acted from the Terms and Definitions clause of IEC publications issued since 2002.Some entr ies have been collected fr om earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Serv ice Centre-webstore.iec.ch/csc If you w ish to give us y our feedback on this publication or need further assistance,please contact the Customer Ser vice Centr e:csciec.ch.IEC 62595-2-1 Edition 1.0 2016-04 INTERNATIONAL STANDARD Display lighting unit Part 2-1:Electro-optical measuring methods of LED back light unit INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120;31.260 ISBN 978-2-8322-3299-6 Registered trademark of the International Electrotechnical Commission Warning!Make sure that y ou obtained this publication from an authorized distributor.colourinside 2 IEC 62595-2-1:2016 IEC 2016 CONTENTS FOREWORD.3 1 Scope.5 2 Normative references.5 3 Terms,definitions and abbreviations.5 3.1 Terms and definitions.5 3.2 Abbreviations.5 4 General measurement conditions.5 4.1 Standard atmospheric conditions for LED BLU.5 4.2 Measuring setup.6 4.3 Warm-up time.6 5 Measurement methods.7 5.1 Electrical measurement methods.7 5.1.1 Conditions.7 5.1.2 Current.7 5.1.3 Voltage.7 5.1.4 Power consumption.7 5.2 Optical measurement methods.7 5.2.1 Conditions.7 5.2.2 Luminance.8 5.2.3 Luminance uniformity or non-uniformity.9 5.2.4 Spectral power distribution.10 5.2.5 Chromaticity.10 5.2.6 Colour uniformity.10 5.2.7 Angular luminance uniformity.11 5.2.8 Angular colour uniformity.11 5.2.9 Measurement methods of block-wise BLUs.11 Bibliography.16 Figure 1 Example of measuring setup for LED BLU.6 Figure 2 Example of warm-up characteristic of BLU.7 Figure 3 Definition of zenith angle and azimuth angle .8 Figure 4 Examples of measurement point layout.10 Figure 5 Angular luminance uniformity measurement.11 Figure 6 Example of checkerboard pattern (8 segments 10 segments)for block-wise BLU.12 Figure 7 Example of single block white pattern.12 Figure 8 Example of single block black pattern.13 Figure 9 Example of incoherent point spread function.13 IEC 62595-2-1:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DISPLAY LIGHTING UNIT Part 2-1:Electro-optical measuring methods of LED backlight unit 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 a