SIST EN 62595-1-1:2013

LCD Backlight Unit - Part 1-1: Generic specification

IEC 62595-1-1:2013 is a generic specification for backlight unit (BLU) for liquid crystal displays. It defines general procedures for quality assessment and gives general rules for the measuring methods of electrical and optical characteristics, rules for climatic and mechanical tests, and rules for endurance tests.

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Ecran LCD à rétroéclairage - Partie 1-1 : Spécification générique

La CEI 62595-1-1:2013 est une spécification générique pour les écrans à rétro-éclairage pour afficheurs à cristaux liquides. Il définit les procédures générales d'évaluation de la qualité et donne des règles générales pour les méthodes de mesure des caractéristiques électriques et optiques, des règles pour les essais climatiques et mécaniques et des règles pour les essais d'endurance.

Zaslon LCD z ozadnjo osvetlitvijo - 1-1. del: Generična specifikacija

Ta del standarda IEC 62282 določa minimalne varnostne zahteve za namestitev notranjih in zunanjih nepremičnih elektroenergetskih sistemov z gorivnimi celicami v skladu s standardom IEC 62282-3-100 in se uporablja za namestitev sistemov: – namenjenih za električno povezavo z glavnim električnim omrežjem, neposredno ali prek lahko dostopnega ročnega stikala ali odklopnika; – namenjenih za samostojni sistem za distribucijo električne energije; – namenjenih za dobavo enosmernega ali izmeničnega toka; – s sposobnostjo pridobivanja koristne toplote ali brez nje. Ta standard je omejen na pogoje, ki se lahko vzpostavijo med postopkom namestitve in so lahko nevarni za osebje ali poškodujejo opremo ali imetje izven elektroenergetskega sistema z gorivnimi celicami.

General Information

• Status: Published
• Publication Date: 10-Jul-2013
• ICS: 31.120 - Electronic display devices
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jul-2013
• Due Date: 14-Sep-2013
• Completion Date: 11-Jul-2013
• Ref Project: EN 62595-1-1:2013 - LCD backlight unit - Part 1-1: Generic specification

Overview

EN 62595-1-1:2013 (identical to IEC 62595-1-1:2013) is a generic European standard for LCD backlight units (BLUs). It defines high-level requirements and general procedures for quality assessment, and provides rules for measuring electrical and optical characteristics, climatic and mechanical testing, and endurance testing. The standard is intended to support consistent specification, testing and acceptance of BLUs used in liquid crystal display assemblies.

Key topics

• Scope and purpose – Generic specification for BLUs used in LCDs, covering quality assessment and test-rule definition.
• Quality assessment procedures – Requirements for qualification approval, manufacturing-stage controls, screening, lot formation, traceability, handling and certified records.
• Marking and packing – Identification, traceability and packaging requirements for BLUs to ensure supply-chain integrity.
• Test and measurement rules – General rules and precautions for electrical and optical measurements under defined atmospheric conditions; allows alternative methods where justified.
• Environmental and mechanical tests – Rules for climatic (temperature, humidity, pressure) and mechanical stress testing to validate robustness.
• Endurance and accelerated tests – Procedures for life and endurance testing, including guidance on failure definitions, sample selection and dealing with specified failure rates.
• Statistical sampling – Use of AQL and LTPD sampling plans, hypergeometric sampling for small lots, and other statistical acceptance criteria.
• Ancillary topics – Terminology, preferred environmental values, symbols and normative references used throughout the IEC 62595 series.

Applications and who uses it

EN 62595-1-1:2013 is practical for:

• BLU and LED backlight manufacturers establishing production control and qualification processes.
• OEMs and system integrators specifying acceptance criteria for display modules in consumer electronics, automotive displays, industrial panels and medical displays.
• Test laboratories and QA teams implementing standardized measurement, climatic, mechanical and endurance tests.
• Procurement and compliance officers ensuring supplier conformity, traceability and consistent lot inspection.
• Certification bodies referencing harmonized procedures for claims about durability and electrical/optical performance.

Using this standard helps reduce test ambiguity, improve supplier qualification, and align product acceptance across the supply chain.

Related standards

• IEC 62595-1-2 / EN 62595-1-2 - Terminology and letter symbols for BLUs
• IEC 62595-2 / EN 62595-2 - Electro‑optical measurement methods for LED BLUs
• IEC 61747-10-2 - Environmental, endurance and mechanical test methods for LCD devices
• Other referenced documents: IEC 60027, IEC 60410, ISO 80000-1.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2013
=DVORQ/&']R]DGQMRRVYHWOLWYLMRGHO*HQHULþQDVSHFLILNDFLMD
LCD Backlight Unit - Part 1-1: Generic specification
/
Ecran LCD à rétroéclairage - Partie 1-1 : Spécification générique
Ta slovenski standard je istoveten z: EN 62595-1-1:2013
ICS:
31.120 Elektronske prikazovalne Electronic display devices
naprave
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62595-1-1
NORME EUROPÉENNE
July 2013
EUROPÄISCHE NORM
ICS 31.120; 31.260
English version
LCD backlight unit -
Part 1-1: Generic specification
(IEC 62595-1-1:2013)
Ecran LCD à rétroéclairage -  LCD-Hinterleuchtungseinheiten – Teil 1-1:
Partie 1-1 : Spécification générique Allgemeine Anforderungen
(CEI 62595-1-1:2013) (IEC 62595-1-1:2013)

This European Standard was approved by CENELEC on 2013-05-14. 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 62595-1-1:2013 E
Foreword
The text of document 110/387/CDV, future edition 1 of IEC 62595-1-1, prepared by IEC/TC 110
"Electronic display devices" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62595-1-1:2013.
The following dates are fixed:
(dop) 2014-02-14
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-05-14
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 62595-1-1:2013 was approved by CENELEC as a
European Standard without any modification.

- 3 - EN 62595-1-1:2013
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 60027 all parts Letter symbols to be used in electrical EN 60027 all parts
technology -
Part 1: General
IEC 60410 1973 Sampling plans and procedures for - -
inspection by attributes
IEC 60617 all parts Graphical symbols for diagrams - -

IEC 60747-1 2006 Semiconductor devices - - -
+ corr. August 2008 Part 1: General

IEC 60747-10 1991 Semiconductor devices - Discrete devices - - -
Part 10: Generic specifictaion for discrete
divices and integrated circuits

IEC 61747-10-2 Liquid crystal display devices - - -
Part 10-2: Environmental, endurance and
mechanical test methods - Environmental
and endurance
IEC 62595-1-2 2011 LCD backlight unit - EN 62595-1-2 2012
Part 1-2: Terminology and letter symbols

IEC 62595-2 LCD backlight unit - EN 62595-2
Part 2: Electro-optical measurement
methods of LED backlight unit for liquid
crystal displays
ISO 80000-1 2009 Quantities and units - EN ISO 80000-1 2013
Part 1: General
IEC QC 001002-2 1998 IEC Quality Assessment System for - -
Electronic Components (IECQ) - Rules of
Procedure - Part 2: Documentation

IEC QC 001002-3 2005 IEC Quality Assessment System for - -
Electronic Components (IECQ) - Rules of
Procedure - Part 3: Approval procedures

IEC 62595-1-1 ®
Edition 1.0 2013-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
LCD backlight unit –
Part 1-1: Generic specification

Écran LCD à rétro-éclairage –
Partie 1-1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 31.120; 31.260 ISBN 978-2-83220-715-4

– 2 – 62595-1-1 © IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Technical aspects . 7
3.1 Order of precedence. 7
3.2 Terminology, units and symbols . 7
3.3 Preferred values of temperature, humidity and pressure . 7
3.4 Marking . 7
3.4.1 BLU identification . 7
3.4.2 BLU traceability . 7
3.4.3 Packing . 7
3.5 Categories of assessed quality . 8
3.6 Screening . 8
3.7 Handling . 8
4 Quality assessment procedures . 8
4.1 General . 8
4.2 Eligibility for qualification approval . 8
4.3 Primary stage of manufacture . 9
4.4 Commercially confidential information . 9
4.5 Formation of inspection lots . 9
4.6 Structurally similar devices . 9
4.7 Granting of qualification approval . 9
4.8 Quality conformance inspection . 9
4.8.1 General . 9
4.8.2 Division into groups and subgroups . 9
4.8.3 Inspection requirements . 11
4.8.4 Supplementary procedure for reduced inspection . 12
4.8.5 Sampling requirements for small lots . 12
4.8.6 Certified records of released lots (CRRL) . 12
4.8.7 Delivery of devices subjected to destructive or non-destructive tests . 12
4.8.8 Delayed deliveries . 13
4.8.9 Supplementary procedure for deliveries . 13
4.9 Statistical sampling procedures . 13
4.9.1 General . 13
4.9.2 AQL sampling plans . 13
4.9.3 LTPD sampling plans . 13
4.10 Endurance tests . 13
4.11 Endurance tests where the failure rate is specified . 13
4.11.1 Specification of failure rate . 13
4.11.2 General . 13
4.11.3 Selection of samples . 13
4.11.4 Failure . 13
4.11.5 Endurance test time and sample size . 14
4.11.6 Procedure to be used if the number of observed failures exceed the
acceptance number . 14
4.12 Accelerated test procedures . 14

62595-1-1 © IEC:2013 – 3 –
4.13 Capability approval . 14
5 Test and measurement procedures . 15
5.1 Standard atmospheric conditions . 15
5.2 Physical examination . 15
5.2.1 Visual examination . 15
5.2.2 Dimensions. 15
5.2.3 Permanence of marking . 15
5.3 Electrical and optical measurements . 15
5.3.1 General conditions and precautions . 15
5.3.2 Alternative methods . 16
5.4 Environmental tests . 16
Annex A (informative) Examples of BLU drawings . 17
Annex B (informative) Lot tolerance percentage defective (LTPD) sampling plans . 19

Figure A.1 – A front view of BLU . 17
Figure A.2 – A rear view of BLU . 17
Figure A.3 – A lateral view of BLU . 18
Figure A.4 – Example of LED edge backlight unit . 18
Figure A.5 – Example of LED direct backlight unit . 18

Table B.1 – LTPD sampling plans (1 of 2) . 20
Table B.2 – Hypergeometric sampling plans for small lot sizes of 200 or less . 22

– 4 – 62595-1-1 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LCD BACKLIGHT UNIT –
Part 1-1: Generic specification

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 62595-1-1 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
CDV Report on voting
110/387/CDV 110/440/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 drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 62595 series, under the general title LCD backlight unit, can
be found on the IEC website.
62595-1-1 © IEC:2013 – 5 –
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.
– 6 – 62595-1-1 © IEC:2013
LCD BACKLIGHT UNIT –
Part 1-1: Generic specification

1 Scope
This part of IEC 62595 is a generic specification for backlight unit (BLU) for liquid crystal
displays. It defines general procedures for quality assessment and gives general rules for the
measuring methods of electrical and optical characteristics, rules for climatic and mechanical
tests, and rules for endurance tests.
2 Normative references
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.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 60747-1:2006, Semiconductor devices – Part 1: General
IEC 60747-10:1991, Semiconductor devices – Part 10: Generic specification for discrete
devices and integrated circuits
IEC 61747-10-2, Liquid crystal display devices – Part 10-2: Environmental, endurance and
mechanical test methods – Environmental and endurance1
IEC 62595-1-2:2012, LCD backlight unit – Part 1-2: Terminology and letter symbols
IEC 62595-2, LCD backlight unit – Part 2: Electro-optical measurement methods of LED
backlight unit
IECQ QC 001002-2:1998, IEC Quality Assessment System for Electronic Components (IECQ
System) – Rules of Procedure– Part 2: Documentation
IECQ QC 001002-3:2005, IEC Quality Assessment System for Electronic Components (IECQ
System) – Rules of Procedure – Part 3: Approval procedures
ISO 80000-1:2009, Quantities and units – Part 1: General
—————————
To be published
62595-1-1 © IEC:2013 – 7 –
3 Technical aspects
3.1 Order of precedence
Where there are conflicting requirements, documents shall rank in the following order of
authority:
a) the detail specification;
b) the blank detail specification;
c) the family specification, if any;
d) the sectional specification;
e) the generic specification;
f) the basic specification;
g) any other international (e.g. IEC) documents to which reference is made;
h) a national document.
The same order of precedence shall apply to equivalent national documents.
3.2 Terminology, units and symbols
For the purposes of this document, the terms, definitions, units, and symbols given in
IEC 62595-1-2 apply.
Units, graphical and letter symbols shall, wherever possible, be taken from IEC 60027,
IEC 60617 and ISO 80000-1.
Any other units, symbols or terminology peculiar to some parts of the BLU covered by this
generic specification shall be taken from the relevant IEC or ISO standards or derived in
accordance with the principles of the standards listed above.
3.3 Preferred values of temperature, humidity and pressure
Preferred values of temperature, humidity and pressure for the measurement of
characteristics for tests and for operating conditions will be given in the detail specification.
3.4 Marking
3.4.1 BLU identification
The marking on the BLU shall enable clear identification of the BLU.
3.4.2 BLU traceability
The BLU shall be provided with a traceability code which enables back-tracing of the BLU to a
certain production or inspection lot.
3.4.3 Packing
Marking on the packing shall state:
a) the BLU identification code;
b) the traceability code(s) of the enclosed BLU;
c) the number of enclosed BLUs;
d) the required precautions, if any.
This marking shall be in accordance with custom regulations.

– 8 – 62595-1-1 © IEC:2013
NOTE Additional requirements can be specified in the relevant detail specification.
3.5 Categories of assessed quality
This generic specification provides three categories of assessed quality. The BLUs are
grouped in an identified and date-coded inspection lot, which is tested to the specified quality
categories. The AQLs or LTPDs associated with the same inspection group may vary for each
category and shall be as specified in the detail specification or in the assessed quality which
is negotiated with a customer.
The minimum requirements of the categories are as follows:
Category I The type meets the requirements of qualification approval of categories II or III.
Each lot meets the inspection requirements of group A which includes functional
tests. Every three months, one lot meets the inspection requirements for
interconnection ability. Annually, one lot meets the group B and group C
inspection requirements (see 4.8.1).
Category II The lot meets the inspection requirements of group A and group B on a lot-by-lot
basis, and of group C on a periodic basis.
Category III The lot is 100 % screened and meets the inspection requirements of group A
and group B on a lot-by-lot basis, and of group C on a periodic basis.
3.6 Screening
A screening is an examination or test applied to all BLUs in a lot.
When required by the detail specification, all BLUs in the lot shall be screened by submitting
them to one of the sequences given in the relevant table of the sectional or blank detail
specification, and all defectives removed. Other sequences not specified in this standard are
applicable only where the above sequences are not correlated or are in contradiction with
recognized failure mechanisms. When a part of the screening process as given in the relevant
table of the sectional or blank detail specification forms a part of the manufacturing process in
the prescribed sequence, these procedures need not to be repeated. For the purpose of this
specification, burn-in is defined as electrical stress applied to all BLUs in a lot for a specified
period of time for the purpose of detecting and removing potential early failures.
3.7 Handling
See IEC 60747-1:2006, Clause 8.
Adequate warning shall be displayed in the case of harmful products.
4 Quality assessment procedures
4.1 General
Quality assessment comprises the procedure for obtaining qualification approval as defined in
4.7, followed by quality conformance inspection on a lot-by-lot basis (including screening if
required) and on a periodic basis as qualified in the detail specification. The quality
assessment tests are subdivided into group A, B and C tests; these are performed lot by lot or
periodically, as defined in 4.8.1. In some cases, group D tests may also be specified, for
example, for qualification approval.
4.2 Eligibility for qualification approval
A type of BLU becomes eligible for qualification approval when the rules of procedure of
IECQ QC 001002-3:2005, are satisfied.

62595-1-1 © IEC:2013 – 9 –
4.3 Primary stage of manufacture
The primary stage of manufacture is defined in the sectional or blank detail specification.
4.4 Commercially confidential information
If any part of the manufacturing process is commercially confidential, this shall be suitably
identified, and the designated management representative (DMR) shall demonstrate to the
satisfaction of the National Supervising Inspectorate (NSI) that the requirements of the rules
of procedure given in 2.3.1 of IECQ QC 001002-3:2005, have been complied with.
4.5 Formation of inspection lots
See the rules of procedure given in 3.3.1 of IECQ QC 001002-3:2005.
4.6 Structurally similar devices
See the rules of procedure given in 3.3.2 of IECQ QC 001002-3:2005.
Details concerning grouping are given in the relevant sectional or blank detail specifications.
4.7 Granting of qualification approval
See the rules of procedure given in 3.1.5 of IECQ QC 001002-3:2005.
Method a) or b) of the rules of procedure may be used at the manufacturer's discretion in
accordance with the inspection requirements given in the sectional or blank detail
specifications. Samples may be composed of appropriate structurally similar devices. In some
cases, group D tests are required for qualification approval. All variables measurements
called for as post-test end-points in the detail specification shall be recorded as variables data.
The qualification report shall include a summary of all the test results for each group and
subgroup, including number of devices tested and number of devices failed. This summary
shall be derived from variables and/or attributes data. The manufacturer shall retain all data
for submission to the NSI on demand.
4.8 Quality conformance inspection
4.8.1 General
Quality conformance inspection shall consist of the examinations and tests of groups A, B, C
and D, as specified.
For groups B and C inspection, samples may be composed of structurally similar devices.
Samples for periodic tests shall be drawn from one or more lots which have passed groups A
and B inspection. Individual BLUs shall have passed the group A measurements called for in
the detail specification.
4.8.2 Division into groups and subgroups
4.8.2.1 General
The following guidelines shall be used in the preparation of detail specifications.
4.8.2.2 Group A inspection (lot-by-lot)
This group prescribes the visual inspection and the electrical measurements to be made on a
lot-by-lot basis to assess the principal properties of BLUs. Unless otherwise specified,
structural similarity groupings are not permitted. Group A inspection is divided into
appropriate subgroups as follows:

– 10 – 62595-1-1 © IEC:2013
Subgroup A1: This subgroup comprises a visual examination as specified in 5.2
...