IEC 61747-20-1:2015

IEC 61747-20-1 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
Liquid crystal display devices –
Part 20-1: Visual inspection – Monochrome liquid crystal display cells
(excluding all active matrix liquid crystal display cells)

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IEC 61747-20-1 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
Liquid crystal display devices –

Part 20-1: Visual inspection – Monochrome liquid crystal display cells

(excluding all active matrix liquid crystal display cells)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-2256-0

– 2 – IEC 61747-20-1:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 6
4 Visual inspection method and criteria . 6
4.1 Standard inspection conditions and methods . 6
4.1.1 Ambient conditions . 6
4.1.2 Inspection equipment and liquid crystal display cells . 7
4.1.3 Inspector and limit sample for visual inspection . 7
4.1.4 Inspection and record of result. 7
4.2 Visual inspection of display . 7
4.2.1 Display not activated . 7
4.2.2 Display activated . 9
4.2.3 Seal inspection . 11
4.2.4 Contact pad area . 12
4.2.5 Chipped material at the borders and edges of support plates of cells . 13
Bibliography . 14

Figure 1 – Defects within the viewing area . 8
Figure 2 – Deviations of dimensions and shape e1 to e4 . 9
Figure 3 – Defects within segments . 9
Figure 4 – Defects within the sealing area . 11
Figure 5 – Defects of contact pad area . 12
Figure 6 – Damage of a corner and an edge . 13

Table 1 – Visual defects to be inspected . 8
Table 2 – Properties of display area to be inspected . 10
Table 3 – Defects of display area to be inspected . 10
Table 4 – Defects of viewing area to be inspected . 10
Table 5 – Defects of sealing area to be inspected . 11
Table 6 – Visual defects of contact pad area to be inspected . 12
Table 7 – Defects of pin to be inspected . 13
Table 8 – Defects of lead to be inspected . 13
Table 9 – Defects of support plate to be inspected . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 20-1: Visual inspection – Monochrome liquid crystal display
cells (excluding all active matrix liquid crystal display cells)

FOREWORD
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International Standard IEC 61747-20-1 has been prepared by IEC technical committee 110:
Electronic display devices.
This first edition cancels and replaces Clause 6 of the first edition of IEC 61747-5 published in
1998. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The editorial modifications were done in accordance with the ISO/IEC Directives, Part 2,
Ed. 6.0:2011.
b) The document number was changed to align with the new numbering structure of the
IEC 61747 series.
– 4 – IEC 61747-20-1:2015 © IEC 2015
NOTE It is intended that the other clauses of IEC 61747-5:1998 will be replaced by new parts in the IEC 61747
series. The details of the intended changes are given in Annex D of IEC 61747-30-1:2012.
The text of this standard is based on the following documents:
CDV Report on voting
110/522/CDV 110/558A/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 parts in t
...