SIST EN IEC 63181-2:2021

LCD multi-screen display terminals - Part 2: Measuring methods (IEC 63181-2:2020)

IEC 63181-2:2020 specifies measuring methods for LCD multi-screen display terminals. To evaluate the characteristics of LCD multi-screen display terminals, the following measurement items are specified:
– gap (physical, optical): detailed splicing precision;
– splicing deviation: splicing accuracy of active areas of LCD splicing screen;
– installation deviation: the flatness of terminal surfaces in vertical and horizontal directions;
– luminance uniformity: luminance uniformity of adjacent LCD units;
– chromatic uniformity: chromatic uniformity of adjacent LCD units.

LCD Multi-screen Anzeigeterminals - Teil 2: Messverfahren (IEC 63181-2:2020)

Terminaux d'affichage à plusieurs écrans LCD - Partie 2: Méthodes de mesure (IEC 63181-2:2020)

L'IEC 63181-2:2020 spécifie les méthodes de mesure des terminaux d'affichage à plusieurs écrans LCD. Pour évaluer les caractéristiques des terminaux d'affichage à plusieurs écrans LCD, les éléments de mesure suivants sont spécifiés:
– écartement (physique, optique): précision de raccordement détaillée;
– écart de raccordement: précision de raccordement des zones actives de l'écran de raccordement LCD;
– écart d'installation: la planéité des surfaces du terminal dans le sens vertical et le sens horizontal;
– uniformité de la luminance: uniformité de luminance des unités LCD adjacentes;
– uniformité chromatique: uniformité chromatique des unités LCD adjacentes.

Zaslonska oprema LCD z več zasloni - 2. del: Merilne metode (IEC 63181-2:2020)

General Information

• Status: Published
• Public Enquiry End Date: 04-Sep-2019
• Publication Date: 04-Mar-2021
• ICS: 33.160.60 - Multimedia systems and teleconferencing equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Aug-2020
• Due Date: 11-Oct-2020
• Completion Date: 05-Mar-2021
• Ref Project: EN IEC 63181-2:2020 - LCD multi-screen display terminals - Part 2: Measuring methods

EN IEC 63181-2:2020 - Overview

EN IEC 63181-2:2020 (adopted by CLC/CENELEC and published nationally as SIST EN IEC 63181-2:2021) defines standardized measuring methods for LCD multi-screen display terminals. It prescribes how to measure structural and optical-electrical characteristics of spliced LCD arrays so manufacturers, integrators and test laboratories can evaluate display quality consistently. Key measurement items include physical and optical gaps, splicing deviation, installation (flatness) deviation, and luminance and chromatic uniformity between adjacent LCD units.

Key topics and requirements

• Scope: Measurement methods for LCD multi-screen display terminals to assess splicing precision and optical uniformity.
• Measurement items:
  • Physical gap: largest mechanical gap between adjacent screen sides (measured with feeler gauge).
  • Optical gap: gap between adjacent active-area boundaries under full-white signal (measured with caliper).
  • Splicing deviation: pixel displacement of active areas (measured using test patterns such as graduations/circles).
  • Installation deviation: flatness of terminal surfaces in vertical and horizontal directions.
  • Luminance uniformity: luminance comparison across adjacent LCD units and edge/center point pairs.
  • Chromatic uniformity: color consistency across centre and adjacent edge-centre points of LCD units.
• Measuring conditions:
  • Temperature: (25 ± 3) °C
  • Relative humidity: 25 % RH to 85 % RH
  • Atmospheric pressure: 86 kPa to 106 kPa
  • Ambient illuminance: ≤ 1 lx
• Optical measuring distance options:
  • Option 1 (recommended): non-contact, distance = 3 × height of a single LCD unit; device perpendicular to test point.
  • Option 2: contact measurement, instrument touches the display surface.

Practical applications and users

Who uses EN IEC 63181-2:2020:

• Display manufacturers - for production quality control and design validation of spliced LCD walls.
• System integrators / AV installers - to verify installation flatness, gap tolerances and visual uniformity after assembly.
• Independent test laboratories - to perform repeatable, standardized performance assessments for procurement/specification compliance.
• Procurement and QA teams - to define acceptance criteria in contracts and evaluate vendor claims about splicing accuracy, luminance and chromatic uniformity.

Typical use-cases:

• Acceptance testing of video walls and control-room displays.
• R&D verification of tiled LCD modules and seam optics.
• Comparative benchmarking of display panels for uniformity and splicing performance.

Related standards

• IEC TS 63181-1 - LCD multi-screen display terminals, Part 1: Conceptual model (normative reference).
• The EN IEC 63181-2 text aligns with international IEC 63181-2:2020 and is endorsed by CENELEC; consult national implementation (e.g., SIST EN IEC 63181-2:2021) for local adoption details.

Keywords: EN IEC 63181-2:2020, LCD multi-screen display terminals, measuring methods, luminance uniformity, chromatic uniformity, physical gap, optical gap, splicing deviation, installation deviation, CLC, CENELEC.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2021
Zaslonska oprema LCD z več zasloni - 2. del: Merilne metode (IEC 63181-2:2020)
LCD multi-screen display terminals - Part 2: Measuring methods (IEC 63181-2:2020)
LCD Multi-screen Anzeigeterminals - Teil 2: Messverfahren (IEC 63181-2:2020)
Terminaux d'affichage à plusieurs écrans LCD - Partie 2: Méthodes de mesure (IEC
63181-2:2020)
Ta slovenski standard je istoveten z: EN IEC 63181-2:2020
ICS:
33.160.60 Večpredstavni (multimedijski) Multimedia systems and
sistemi in oprema za teleconferencing equipment
telekonference
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63181-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2020
ICS 31.120
English Version
LCD multi-screen display terminals - Part 2: Measuring methods
(IEC 63181-2:2020)
Terminaux d'affichage à plusieurs écrans LCD - Partie 2: LCD Multi-screen Anzeigeterminals - Teil 2: Messverfahren
Méthodes de mesure (IEC 63181-2:2020)
(IEC 63181-2:2020)
This European Standard was approved by CENELEC on 2020-07-16. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63181-2:2020 E

European foreword
The text of document 100/3413/FDIS, future edition 1 of IEC 63181-2, prepared by IEC/TC 100
"Audio, video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN IEC 63181-2:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-04-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-07-16
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 shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 63181-2:2020 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 60107-1:1997 NOTE Harmonized as EN 60107-1:1997 (not modified)
IEC 61747-30-1:2012 NOTE Harmonized as EN 61747-30-1:2012 (not modified)

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC/TS 63181-1 - LCD multi-screen display terminals - Part - -
1: Conceptual model
IEC 63181-2 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
LCD multi-screen display terminals –

Part 2: Measuring methods
Terminaux d'affichage à plusieurs écrans LCD –

Partie 2: Méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.120 ISBN 978-2-8322-8444-5

– 2 – IEC 63181-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Measuring conditions . 5
4.1 Standard measuring environmental conditions . 5
4.2 Optical measuring distance . 6
5 Measurement methods of structure test for LCD multi-screen display terminals . 6
5.1 Physical gap . 6
5.1.1 General . 6
5.1.2 Method of measurement . 6
5.2 Optical gap . 7
5.2.1 General . 7
5.2.2 Method of measurement . 7
5.3 Splicing deviation . 7
5.3.1 General . 7
5.3.2 Method of measurement . 8
5.4 LCD multi-screen display terminals installation deviation . 8
5.4.1 General . 8
5.4.2 Method of measurement . 9
6 Measuring methods of LCD multi-screen display terminals' optical-electrical
performance . 10
6.1 Measuring methods of LCD multi-screen display terminals' luminance –
uniformity . 10
6.1.1 LCD splicing screen luminance uniformity . 10
6.1.2 Luminance uniformity of adjacent LCD units . 11
6.2 Measuring methods of chromatic uniformity for LCD splicing screen . 13
6.2.1 Chromatic uniformity of centre points of LCD units . 13
6.2.2 Chromatic uniformity of adjacent edge-centre points of adjacent LCD
units . 13
Bibliography . 15

Figure 1 – Illustration for physical gap and optical gap . 7
Figure 2 – Illustration for test signal . 8
Figure 3 – Illustration for diagonal distances . 9
Figure 4 – Illustration for ∠EBD . 10
Figure 5 – Illustration for testing units . 11
Figure 6 – Example for luminance measurements of edge-centre point pairs . 12

Table 1 – Example for luminance performance calculation of edge-centre point pairs
P . 13
1~4
IEC 63181-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LCD MULTI-SCREEN DISPLAY TERMINALS –

Part 2: Measuring methods
FOREWORD
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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 63181-2 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
100/3413/FDIS 100/3441/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 63181 series, published under the general title LCD multi-screen
display terminals, can be found on the IEC website.

– 4 – IEC 63181-2:2020 © IEC 2020
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• a
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