IEC 61747-20-1:2015

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

IEC 61747-20-1:2015(E) gives the details of testing and provides general rules for visual inspection of the non-active and active area of monochrome liquid crystal display cells by the human eye, if necessary, through an optical microscope. Furthermore this standard includes defect definitions and the methods for visual defect inspection. 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.

General Information

• Status: Published
• Publication Date: 16-Feb-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.120 - Electronic display devices
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 2 - TC 110/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 30-Apr-2015
• Completion Date: 17-Feb-2015

Standards Content (Sample)

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
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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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 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 the IEC 61747 series, published under the general title Liquid crystal
display devices, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
This part of IEC 61747 facilitates the visual inspection of image defects of monochrome LCD
cells by human eyes subjectively. Visual inspection is performed at specified conditions and
criteria. The objective measurement method of visual image defect with an instrument will be
studied and standardized.
– 6 – IEC 61747-20-1:2015 © IEC 2015
LIQUID CRYSTAL DISPLAY DEVICES –

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

1 Scope
This part of IEC 61747 gives the details of testing and provides general rules for visual
inspection of the non-active and active area of monochrome liquid crystal display cells by the
human eye, if necessary, through an optical microscope. Furthermore this standard includes
defect definitions and the methods for visual defect inspection.
NOTE Restrictions on defect types, number, and sizes are specified in the quality contract (customer acceptance
specification and incoming inspection specification).
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 61747-1-2:2014, Liquid crystal display device
...