IEC 61747-20-3:2016

Liquid crystal display devices - Part 20-3: Visual inspection - Active matrix colour liquid crystal display modules

IEC 61747-20-3:2016(E) gives the details of the quality assessment procedures and provides general rules for visual inspection of the active area of transmissive type active matrix colour liquid crystal display modules by the human eye. Furthermore, this standard includes defect definitions and the method for visual defect inspection. This first edition cancels and replaces the first edition of IEC 61747-5-2 published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) document numbering was changed to align with the new numbering of IEC 61747.

General Information

• Status: Published
• Publication Date: 23-Feb-2016
• 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: 31-Mar-2016
• Completion Date: 24-Feb-2016

Relations

• Replaces: IEC 61747-5-2:2011 - Liquid crystal display devices - Part 5-2: Environmental, endurance and mechanical test methods - Visual inspection of active matrix colour liquid crystal display modules
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61747-20-3 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
colour
inside
Liquid crystal display devices –
Part 20-3: Visual inspection – Active matrix colour liquid crystal display modules
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IEC 61747-20-3 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
colour
inside
Liquid crystal display devices –

Part 20-3: Visual inspection – Active matrix colour liquid crystal display modules

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-3210-1

– 2 – IEC 61747-20-3:2016 © IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms, definitions and abbreviations . 6
3.1 General . 6
3.3 Abbreviations . 11
4 Visual inspection method and criteria . 11
4.1 Standard inspection conditions . 11
4.1.1 Ambient conditions . 11
4.1.2 Visual inspection conditions . 12
4.1.3 Electrical driving conditions . 12
4.2 Standard inspection method . 12
4.2.1 Setup of inspection equipment and liquid crystal display modules . 12
4.2.2 Inspector and limit sample for visual inspection . 12
4.2.3 Inspection and record of result . 12
4.3 Criteria . 12
4.3.1 Bright subpixel defects . 12
4.3.2 Dark subpixel defects . 12
4.3.3 Intermediate subpixel defects . 13
4.3.4 Cluster subpixel defects . 13
4.3.5 Bright line defects . 13
4.3.6 Dark line defects . 13
4.3.7 Scratch and dent defects . 13
4.3.8 Foreign material and bubble defects . 13
4.3.9 Light leakage defects . 14
Bibliography . 15

Figure 1 – Classification of defects by visual inspection . 7
Figure 2 – Examples of bright subpixel and adjacent subpixel defects in case of an
RGB primary colour display . 8
Figure 3 – Examples of dark subpixel and adjacent subpixel defects in case of RGB
primary colour display . 9
Figure 4 – Examples of minimum distance between subpixel defects . 10
Figure 5 – Example of light leakage between the top case and outer black matrix . 11
Figure 6 – Shape of scratch and dent defects . 13
Figure 7 – Shape of foreign material and bubble defects . 14

Table 1 – Criteria for scratch and dent defects . 13
Table 2 – Criteria for foreign material and bubble defects . 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 20-3: Visual inspection – Active matrix colour
liquid crystal display modules

FOREWORD
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International Standard IEC 61747-20-3 has been prepared by IEC technical committee 110:
Electronic display devices.
This first edition cancels and replaces the first edition of IEC 61747-5-2 published in 2011.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) document numbering was changed to align with the new numbering of IEC 61747.

– 4 – IEC 61747-20-3:2016 © IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
110/725/FDIS 110/740/RVD
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 of the IEC 61747 series, 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
This part of IEC 61747 facilitates the visual inspection of the image defect of LCD modules by
human eyes subjectively. Visual inspection is performed at specified conditions and criteria.
The objective measurement method of visual image defects with an instrument will be studied
and standardized.
– 6 – IEC 61747-20-3:2016 © IEC 2016
LIQUID CRYSTAL DISPLAY DEVICES –

Part 20-3: Visual inspection – Active matrix colour
liquid crystal display modules

1 Scope
This part of IEC 61747 gives the details of the quality assessment procedures and provides
general rules for visual inspection of the active area of transmissive type active matrix colour
liquid crystal display modules by the human eye. Furthermore, this standard includes defect
definitions and the method for visual defect inspection.
NOTE 1 Mura is excluded from this standard because it was not clearly specified at the time this standard was
developed.
NOTE 2 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 617
...