LCD multi-screen display terminals - Part 2: Measuring methods

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.

Terminaux d'affichage à plusieurs écrans LCD - Partie 2: Méthodes de mesure

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.

General Information

Status
Published
Publication Date
10-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
11-Jun-2020
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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
IEC 63181-2:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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
---------------------- Page: 3 ----------------------
– 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
---------------------- Page: 4 ----------------------
IEC 63181-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LCD MULTI-SCREEN DISPLAY TERMINALS –
Part 2: Measuring methods
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

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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 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.
---------------------- Page: 5 ----------------------
– 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
• amended.
---------------------- Page: 6 ----------------------
IEC 63181-2:2020 © IEC 2020 – 5 –
LCD MULTI-SCREEN DISPLAY TERMINALS –
Part 2: Measuring methods
1 Scope

This part of IEC 63181 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.
2 Normative references

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.
IEC TS 63181-1, LCD multi-screen display terminals – Part 1: Conceptual model
3 Terms and definitions

For the purposes of this document, the terms and definitions defined in IEC TS 63181-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Measuring conditions
4.1 Standard measuring environmental conditions

Measurements shall be carried out under the following standard environmental conditions:

• Temperature: (25 ± 3) °C;
• Relative humidity: 25 % RH to 85 % RH;
• Atmospheric pressure: 86 kPa to 106 kPa;
• Illuminance range: ≤ 1 lx.

When different environmental conditions are applied, they shall be noted in the measurement

report.
---------------------- Page: 7 ----------------------
– 6 – IEC 63181-2:2020 © IEC 2020
4.2 Optical measuring distance
Two measurement distance options are provided to perform the measurement:
– Option 1 (recommended): non-contact measurement

In this option, the measurement distance shall be set to 3 times the height of a single LCD

unit; the measurement device shall be perpendicular to the test point(s) during the entire

measurement.
– Option 2: contact measurement
In this option, there is no measurement distance between the LCD units and the

measurement device, which means that the measurement device is in direct contact with

the surface of the LCD units at the test point(s) during the entire measurement.
5 Measurement methods of structure test for LCD multi-screen display
terminals
5.1 Physical gap
5.1.1 General

The purpose of this test is to measure the gap(s) between adjacent screen sides for all the

adjacent LCD units.
5.1.2 Method of measurement

Apply a feeler gauge(s) to measure the gap(s) between the adjacent screen sides for all the

adjacent LCD units. The physical gap is the largest measurement recorded (see Figure 1).

---------------------- Page: 8 ----------------------
IEC 63181-2:2020 © IEC 2020 – 7 –
Key
V , H the optical gap
1 1
V , H the physical gap
2 2

NOTE This figure shows a 2-by-2 LCD unit matrix as an example only. The relevant requirements are compatible

for an m-by-n LCD unit matrix, with m + n > 2.
Figure 1 – Illustration for physical gap and optical gap
5.2 Optical gap
5.2.1 General

The purpose of this test is to measure the gap(s) between adjacent active area boundaries for

all the adjacent LCD units.
5.2.2 Method of measurement

a) Input a full white signal to the LCD multi-screen display terminals, set all LCD units of the

LCD splicing screen to standard states that are factory default settings or manufacturer-

specified settings.

b) Use a calliper to measure the gap(s) between adjacent active area boundaries for all the

adjacent LCD units; record the largest measurement as the optical gap (see Figure 1).

5.3 Splicing deviation
5.3.1 General

The purpose of this test is to measure the displacement of active areas (in pixels) of an LCD

splicing screen.
---------------------- Page: 9 ----------------------
– 8 – IEC 63181-2:2020 © IEC 2020
5.3.2 Method of measurement

a) Set all LCD units in the LCD splicing screen to standard states that are factory default

settings or manufacturer-specified settings.

b) Input a signal which is composed of a graduation and a circle. Then, let the signal roam

over each group of the 2-by-2 (1-by-2 or 2-by-1 are acceptable when 2-by-2 is not

possible) LCD units in the LCD splicing screen, without any overlaps for any adjacent

groups.

c) Preliminarily, measure the effect of the circle signal over the whole group (see Figure 2 a)).

d) Accurately measure the displacement of the adjacent active area boundaries in the

vertical and horizontal directions of the LCD units with the partial graduation signal (see

Figure 2 b).
a) Test signal
b) Partial test signal
Figure 2 – Illustration for test signal
5.4 LCD multi-screen display terminals installation deviation
5.4.1 General

The purpose of this test is to verify the flatness and installation deviation of LCD multi-screen

display terminals, including diagonal deviation, edge flatness, LCD splicing screen display

surface flatness, vertical installation deviation.
---------------------- Page: 10 ----------------------
IEC 63181-2:2020 © IEC 2020 – 9 –
5.4.2 Method of measurement

a) Define the four corners of the LCD splicing screen as A, B, C, D (see Figure 3).

b) Measure the edge lengths of AB, BD, CD, AC, compare the lengths of AB and CD with the

width of the LCD splicing screen without installation deviation, record the differences as

ΔL and ΔL ; compare AC and BD with the accurate height of the LCD splicing
width,1 width,2
screen without installation deviation, record the differences as ΔL and ΔL .
height,1 height,2
The differences correspond to the flatness of the edges.

c) Measure and record the length of AD and BC. Then, measure the LCD splicing screen

display surface flatness by calculating the length differences of AD and BC as
ΔLL− L in part b), with the assumption that all the outer edges of LCD splicing
AD BC

screen are aligned. If Δ0L≠ , it means that the surface of the LCD splicing screen is not

flat.

d) Hang a vertical plumb from point B, measure and calculate ∠EBD in degrees, which is the

LCD splicing screen's vertical installation deviation (see Figure 4).
NOTE 1 A, B, C, D are the four vertexes of the LCD splicing screen.
NOTE 2 The ideal gap between LCD units at any installation for calculation is 0.

NOTE 3 This figure shows a 2-by-2 LCD unit matrix as an example only. The relevant requirements are

compatible for an m-by-n LCD unit matrix, with m + n > 2.
Figure 3 – Illustration for diagonal distances
---------------------- Page: 11 ----------------------
– 10 – IEC 63181-2:2020 © IEC 2020
Key
a ∠EBD, the angle between BE and BD

NOTE This figure shows a 2-by-2 LCD unit matrix as an example only. The relevant requirements are compatible

for an m-by-n LCD unit matrix, with m + n > 2.
Figure 4 – Illustration for ∠EBD
6 Measuring methods of LCD multi-screen display terminals' optical-electrical
performance
6.1 Measuring methods of LCD multi-screen display terminals' luminance –
uniformity
6.1.1 LCD splicing screen luminance uniformity
6.1.1.1 General

The purpose of this test is to verify the luminance uniformity of the LCD splicing screen

through each LCD unit in the LCD splicing screen. This test procedure is modified from

IEC 61747-30-1:2012, 6.7.3.2.
6.1.1.2 Method of measurement

a) Input a full white signal to LCD splicing screen, set all LCD units of LCD splicing screen to

standard states that are factory default settings or manufacturer-specified settings.

b) Use a light measurement device (LMD) to measure the centre point luminance for all LCD

units and record as L with i= 1,2,3,... (see Figure 5).
c) Calculate the average luminance of the LCD splicing screen (see Formula (2));

d) Calculate the luminance uniformity of LCD splicing screen (see Formula (1) with

lum
result expressed as a percentage).
i=1,2,3...
U = Max (1)
lum
ave
LL=
(2)
ave
i=1,2,3,... i
where
L is the LCD multi-screen display terminals' average luminance;
ave
n is the total number of LCD units.
---------------------- Page: 12 ----------------------
IEC 63181-2:2020 © IEC 2020 – 11 –
Key
W represents the full width of each LCD unit
H represents the full height of each LCD unit

NOTE This figure shows a 3-by-3 LCD unit matrix as an example only. The relevant requirements are compatible

for an m-by-n LCD unit matrix, with m + n > 2.
Figure 5 – Illustration for testing units
6.1.2 Luminance uniformity of adjacent LCD units
6.1.2.1 General

The purpose of this test is to verify luminance uniformity of all adjacent LCD units in an LCD

splicing screen.

For all measurements in 6.1.2, to make the measurement methods easily understood, the 3-

by-3 LCD splicing screen is provided as an example (see Figure 6). The actual measurements

shall be made at all adjacent edge-centre point pairs of all LCD units in an m-by-n LCD

splicing screen. Each adjacent edge-centre point pair shall be tested once only, or the

duplicate values will have an effect on the accuracy of the final result.
6.1.2.2 Method of measurement

a) Set all LCD units to standard states that are factory default settings or manufacturer-

specified settings, and ensure the LCD splicing screen displays a full white signal.

b) Use an LMD to measure the luminance of each pair of adjacent edge-centre points for all

pairs P, record and sort the luminance values as ( L , L ) for each pair P
adj,1 adj,2
(see Figure 6).

c) Compare luminance in each pair of adjacent edge-centre points for all pairs P, record and

calculate luminance uniformity all non-redundant adjacent pairs of LCD units U with

adj
Formula (3) and Formula (4) (see Table 1 for the calculation example of P ).
1~4
---------------------- Page: 13 ----------------------
– 12 – IEC 63181-2:2020 © IEC 2020
Max(LL, )− L Min(LL, )− L
P,n P,n
adj,1 adj,2 adj,1 adj,2
U 1− or 1− (3)
adj
L L
P,n P,n
where
n is the identity number of the adjacent edge-centre points pair P, n = 1,2,3…
LL+
adj,1 adj,2
(4)
LP,n=
where
n is the identity number of the adjacent edge-centre points pair P, n = 1,2,3…
Key
W represents the full width of each LCD unit
H represents the full height of each LCD unit

Luminance values of the adjacent edge-centre points pairs P shall be measured for this example.

1~12

NOTE The distance of all edge-centre points to the corresponding edges are either 1/9 height of a single LCD unit

or 1/9 width of a single LCD unit. Based on the distances in IEC 60107-1:1997, Figure 82.

Figure 6 – Example for luminance measurements of edge-centre point pairs
---------------------- Page: 14 ----------------------
IEC 63181-2:2020 © IEC 2020 – 13 –
Table 1 – Example for luminance performance calculation
of edge-centre point pairs P
1~4
Example P P P P
1 2 3 4
pairs
Parameters
L L L L L L L L
adj,1 adj,2 adj,1 adj,2 adj,1 adj,2 adj,1 adj,2
Data xx xx xx xx xx xx xx xx
Max (or Min)
M M M M
P,1 P,2 P,3 P,4
in each pair
= Max( L , L ) or = Max( L , L ) or = Max( L , L ) or = Max( L , L ) or
adj,1 adj,2 adj,1 adj,2 adj,1 adj,2 adj,1 adj,2
L , L ) L , L ) L , L ) L , L )
= Min( = Min( = Min( = Min(
adj,1 adj,2 adj,1 adj,2 adj,1 adj,2 adj,1 adj,2
Average
luminance
LL+ LL+ LL+ LL+
adj,1 adj,2 adj,1 adj,2 adj,1 adj,2 adj,1 adj,2
L = L = L = L =
P,1 P,2 P,3 P,4
L of each
P 2 2 2 2
pair
Luminance
uniformity
ML+ ML+ ML+ ML+
P,1 P,2 P,3 P,4
P,1 P,2 P,3 P,4
1− 1− 1− 1−
U of each
adj
L L L L
P,1 P,2 P,3 P,4
pair

In row 4, for each edge-centre points pair, if the measurement purpose is to measure the performance difference

between the Max value and the average value, choose the Max value; otherwise, choose the Min value.

Alternatively, report the maximum value from the U of all pairs as the final result.

adj
6.2 Measuring methods of chromatic uniformity for LCD splicing screen
6.2.1 Chromatic uniformity of centre points of LCD units
6.2.1.1 General

The purpose of this test is to verify the chromatic deviations for all LCD unit centre points in

an LCD splicing screen. This test procedure is modified from IEC 61747-30-1:2012, 6.7.5.2.

6.2.1.2 Method of measurement

a) Set all LCD splicing units to standard states that are factory default settings or

manufacturer-specified settings, and ensure the LCD splicing screen displays a full white

signal.

b) Use an LMD to measure the chromatic coordinates ( u , v ) with i= 1,2,3,... , for all

c,i c,i
centre points of the LCD units (see Figure 5).

c) Set one of the pairs of ( u , v ) as the overall reference pair ( u , v ), calculate the

c,i c,i 0 0
chromatic uniformity Δuv for the LCD splicing screen (see Formula (5)):
(5)
Δuv Maxu−u+−v v
( ) ( )
c c,ii0 c, 0
6.2.2 Chromatic uniformity of adjacent edge-centre points of adjacent LCD units
6.2.2.1 General

The purpose of this test is to verify the chromatic uniformity of edge-centre point pairs for all

adjacent edge pairs of all LCD units in the LCD splicing screen.
---------------------- Page: 15 ----------------------
– 14 – IEC 63181-2:2020 © IEC 2020
6.2.2.2 Method of measurement

a) Set all LCD splicing units to standard states that are factory default settings or

manufacturer-specified settings, and ensure the LCD splicing screen displays a full white

signal.

b) Use an LMD to measure the chromatic coordinate pairs ( u , v ) and ( u , v ) ( ij≠ ,

i i j j

ij, = 1,2,3,... ) for all edge-centre point pairs of all adjacent edge pairs of all LCD units in

the LCD splicing screen (see Figure 6).

c) Calculate the chromatic uniformity Δuv with n= 1,2,3,... for all non-redundant chromatic

P,n

coordinate pairs of all adjacent edge pairs of all LCD units in the LCD splicing screen

(see Formula (7)).

d) The chromatic uniformity Δuv of adjacent edge-centre points of adjacent LCD units shall

be the maximum value from all Δuv obtained from part c) (see Formula (6)).
P,n
(6)
Δuv =MaxΔuv
( )
P P,n
(7)
2 2
Δuv u−u +−v v
( ) ( )
P,n i j ij
---------------------- Page: 16 ----------------------
IEC 63181-2:2020 © IEC 2020 – 15 –
Bibliography
IEC 60107-1:1997, Method of measurement on receivers for television broadcast
transmissions – Part 1: General considerations – Measurements at radio and video
frequencies
IEC 61747-30-1:2012, Liquid
...

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