1、 IEC 62595-2-1 Edition 1.0 2016-04 INTERNATIONAL STANDARD Display lighting unit Part 2-1: Electro-optical measuring methods of LED backlight unit IEC 62595-2-1:2016-04(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherw
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10、sc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: 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 backlight unit INTERNATIONA
11、L ELECTROTECHNICAL COMMISSION ICS 31.120; 31.260 ISBN 978-2-8322-3299-6 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62595-2-1:2016 IEC 2016 CONTENTS FOREWORD . 3 1 Scop
12、e 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 measur
13、ement 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 unifor
14、mity 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 azimu
15、th 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 pat
16、tern . 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 w
17、orldwide 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 addition to othe
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24、 not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its tec
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26、C Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subj
27、ect of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62595-2-1 has been prepared by IEC Technical Committee 110: Electronic display devices. This first edition cancels and replaces the first edition of IEC 62595-2 published
28、 in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) changed the series title in order to cover frontlight unit; b) added the detailed measurement procedures particularly for block-wise BLU
29、; c) deleted Annex A; d) revised Figure 1 and Figure 2 and some editorial errors. 4 IEC 62595-2-1:2016 IEC 2016 The text of this standard is based on the following documents: FDIS Report on voting 110/731A/FDIS 110/743A/RVD Full information on the voting for the approval of this standard can be foun
30、d in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 62595 series, published under the general title Display lighting unit, can be found on the IEC website. Future standards in this
31、 series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “htt
32、p:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication 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 logo on the cover page of t
33、his 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 62595-2-1:2016 IEC 2016 5 DISPLAY LIGHTING UNIT Part 2-1: Electro-optical measuring methods of LE
34、D backlight unit 1 Scope This part of IEC 62595 specifies the standard measurement conditions and measuring methods for determining the electrical and optical parameters of LED backlight units for liquid crystal displays. 2 Normative references The following documents, in whole or in part, are norma
35、tively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61747-30-1, Liquid crystal display devices Part 30-1: Meas
36、uring methods for liquid crystal display modules Transmissive type IEC 62595-1-2, Display lighting unit Part 1-2: Terminology and letter symbols 13 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 62595-1-2 apply
37、. 3.2 Abbreviations BLU backlight unit FOV field of view LMD light measuring device LSF light spread function 4 General measurement conditions 4.1 Standard atmospheric conditions for LED BLU Unless otherwise specified, all tests and measurements for LED BLU shall be carried out after sufficient warm
38、-up time (see 4.3), under the standard environmental conditions, at a temperature of 25 C 3 C, a relative humidity of 25 % to 85 %, and an atmospheric pressure of 86 kPa to 106 kPa. When different environmental conditions are used, they shall be noted in the detail specification (see IEC 61747-30-1)
39、. _ 1To be published. 6 IEC 62595-2-1:2016 IEC 2016 4.2 Measuring setup Figure 1 shows a typical setup of a BLU, luminance meter, power source, block controller, voltmeters and current meters for electro-optical measurements for LED BLU. Figure 1 Example of measuring setup for LED BLU 4.3 Warm-up ti
40、me The luminance of LED backlights is affected by the transient temperature behaviour of LED output as in Figure 2. It takes a certain time for LEDs until their junction temperature reaches the steady state. Luminance measurement shall be carried out and recorded until the fluctuations of luminance
41、measured at an appropriate point (usually at the centre point) of the BLU become less than the range specified in IEC 61747-30-1 unless otherwise specified. The luminance measurement shall be carried out as in 5.2.2. All measuring conditions shall be kept constant during the measurements. Chromatici
42、ty measurement shall be carried out in the same manner as in the above, unless otherwise specified. The chromaticity measurement shall be carried out as in 5.2.5. The above measurements can be customized between the customer and the supplier, depending on various BLU sizes, applications, and so on.
43、LMD (Luminance meter) BLU FOV Measurement distance Power supply Block control signal (for block-wise BLU) BLU Power supply Block control signal (for block-wise BLU) V I I V V BLU I BLU V signal I signal Sample stage Ammeter I V Voltmeter IEC IEC 62595-2-1:2016 IEC 2016 7 Figure 2 Example of warm-up
44、characteristic of BLU 5 Measurement methods 5.1 Electrical measurement methods 5.1.1 Conditions The BLU shall be placed in the measurement arrangement and it shall be assured that all required conditions are fulfilled. After applying the initial electrical driving conditions (i.e. analogue input vol
45、tage(s) or digital input signals) of the BLU and waiting during the warm-up time specified in 4.3 in order to reach the steady state, the measurement of the electrical quantities of interest shall be started. 5.1.2 Current The measurement of input current should be performed under standard measuring
46、 conditions using the current meter shown in Figure 1. 5.1.3 Voltage The measurement of input voltage should be performed under standard measuring conditions using the voltage meter shown in Figure 1. 5.1.4 Power consumption The measurement of power consumption should be carried out under the standa
47、rd measuring conditions in 4.1, using a power meter, or calculated by the measured values of voltage and currents in 5.1.2 and 5.1.3. For block-wise BLUs, the power consumption of the control signal shall be considered. 5.2 Optical measurement methods 5.2.1 Conditions The LED BLU to be measured shou
48、ld be placed in the measurement arrangement and it shall be assured that all required conditions are fulfilled. IEC 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 0 10 20 30 40 50 60 Relative luminance Time (min) 8 IEC 62595-2-1:2016 IEC 2016 After applying the initial electrical driving conditions to the BLU and
49、waiting during the warm- up time specified in 4.3 in order to reach the steady state, the measurement of the optical quantities of interest shall be started. The measurement of this standard should be carried out at various angles between the BLU and the LMD. A polar coordinate system ( , ), with the zenith denoted by and the azimuth denoted by should be considered (see Figure 3). Figure 3 Definition of zenith angle and azimuth angle 5.2.2 Lumin
