SIST EN 62595-2:2013

SLOVENSKI STANDARD
SIST EN 62595-2:2013
01-julij-2013
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LCD backlight unit - Part 2: Electro-optical measurement methods of LED backlight unit
LCD-Hinterleuchtungseinheiten - Teil 2: Elektro-optische Messverfahren für LED-
Hinterleuchtungseinheiten
Ecran LCD à rétro-éclairage - Partie 2: Méthodes de mesures électro-optiques d'un
écran à retro-éclairage à DEL
Ta slovenski standard je istoveten z: EN 62595-2:2013
ICS:
31.120 Elektronske prikazovalne Electronic display devices
naprave
SIST EN 62595-2:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62595-2:2013

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SIST EN 62595-2:2013

EUROPEAN STANDARD
EN 62595-2

NORME EUROPÉENNE
February 2013
EUROPÄISCHE NORM

ICS 31.120; 31.260


English version


LCD backlight unit -
Part 2: Electro-optical measurement methods of LED backlight unit
(IEC 62595-2:2012)


Ecran LCD à rétro-éclairage -  LCD-Hinterleuchtungseinheiten -
Partie 2: Méthodes de mesures Teil 2: Elektro-optische Messverfahren
électro-optiques d'un écran für LED-Hinterleuchtungseinheiten
à retro-éclairage à DEL (IEC 62595-2:2012)
(CEI 62595-2:2012)




This European Standard was approved by CENELEC on 2012-11-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62595-2:2013 E

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SIST EN 62595-2:2013
EN 62595-2:2013 - 2 -
Foreword
The text of document 110/384/FDIS, future edition 1 of IEC 62595-2, prepared by IEC/TC 110
"Electronic display devices" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62595-2:2013.
The following dates are fixed:
(dop) 2013-08-08
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-11-01
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 62595-2:2012 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61747-1 NOTE Harmonised as EN 61747-1.
ISO 11664-1:2007 NOTE Harmonised as EN ISO 11664-1:2011 (not modified).
ISO 11664-5:2009 NOTE Harmonised as EN ISO 11664-5:2011 (not modified).

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SIST EN 62595-2:2013
- 3 - EN 62595-2:2013
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050 Series International Electrotechnical Vocabulary - -
(IEV)


IEC 61747-6 - Liquid crystal and solid-state display EN 61747-6 -
devices -
Part 6: Measuring methods
for liquid crystal modules - Transmissive type


IEC 62595-1-2 - LCD backlight unit - EN 62595-1-2 -
Part 1-2: Terminology and letter symbols


CIE publication 15 2004 Colorimetry - -

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SIST EN 62595-2:2013

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SIST EN 62595-2:2013




IEC 62595-2

®


Edition 1.0 2012-09




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










LCD backlight unit –

Part 2: Electro-optical measurement methods of LED backlight unit




Écran LCD à rétro-éclairage –

Partie 2: Méthodes de mesures électro-optiques d'un écran à rétro-éclairage à

DEL














INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX P


ICS 31.120; 31.260 ISBN 978-2-83220-344-6



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62595-2:2013
– 2 – 62595-2 © IEC:2012
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General measurement conditions . 5
4.1 Standard atmospheric conditions for LED BLU . 5
4.2 Measuring setup . 5
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 . 8
5.2.1 Conditions . 8
5.2.2 Luminance . 8
5.2.3 Luminance uniformity. 8
5.2.4 Spectral power distribution . 10
5.2.5 Chromaticity . 10
5.2.6 Colour uniformity . 10
5.2.7 Correlated colour temperature . 11
5.2.8 Angular luminance uniformity . 11
5.2.9 Angular colour uniformity . 11
5.2.10 Measurement methods of block-wise BLU. 12
Annex A (informative) Practical measurement methods of block-wise BLU . 14
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 θ and azimuth angle ϕ. . 8
Figure 4 – Examples of measurement point layout . 10
Figure 5 – Angular luminance uniformity measurement . 11
Figure 6 – Example of test pattern (8 × 10 segments) for block-wise BLU . 12
Figure 7 – Example of incoherent point spread function . 12
Figure 8 – Example of test pattern of incoherent point spread function . 13
Figure 9 – Example of test pattern of crosstalk . 13
Figure A.1 – Measurement of average slope of incoherent point spread function . 14
Figure A.2 – Black box pattern for crosstalk measurement using LCD . 15
Figure A.3 – Example of crosstalk measurement results using LCD . 15

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SIST EN 62595-2:2013
62595-2 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

LCD BACKLIGHT UNIT –

Part 2: Electro-optical measurement 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 addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is 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 technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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 subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62595-2 has been prepared by IEC Technical Committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/384/FDIS 110/406/RVD

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 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 LCD backlight unit,
can be found on the IEC website.

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SIST EN 62595-2:2013
– 4 – 62595-2 © IEC:2012
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://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.

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.

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SIST EN 62595-2:2013
62595-2 © IEC:2012 – 5 –
LCD BACKLIGHT UNIT –

Part 2: Electro-optical measurement methods of LED backlight unit



1 Scope
This part of IEC 62595 series specifies the standard measurement conditions and measuring
methods for determining electrical, optical, and electro-optical parameters of LED backlight
units for liquid crystal displays.
NOTE Other backlights (Cold Cathode Fluorescent Lamps (CCFLs), External Electrode Fluorescent Lamps
(EEFLs), Hot Cathode Fluorescent Lamps (HCFLs), Carbon Nano Tube (CNT),
...