IEC 63181-2:2020

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
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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
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LCD MULTI-SCREEN DISPLAY TERMINALS –

Part 2: Measuring methods
FOREWORD
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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
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