WG 2 - TC 110/WG 2

IEC 61747-30-5:2019(E) specifies the standard measurement conditions and measuring methods for determining the optical properties of transparent liquid crystal display modules which operate in a transmissive mode. More specifically, this document focuses on three particular aspects of the transparent properties, i.e. transmittance, haze, and image distortion.

IEC 61747-40-5:2018(E) is a mechanical performance testing procedure for cover glass used in electronic displays in mobile devices. This document focuses on the measurement of surface impact energy required to fracture a specimen due to the collision of sharp particles onto the surface of a cover glass. This is achieved by dropping a ball on a sheet of coated abrasives placed on the cover glass, which is rigidly supported. The failure mode is associated with damage introduction via sharp contact. Crack propagation is enhanced by central tension in the case of strengthened glass. This failure mode represents one of several field failure modes observed in mobile devices.

IEC 61747-40-6:2018(E) is a mechanical performance testing procedure for cover glass used in electronic flat panel displays in mobile devices. This document focuses on the measurement of surface fracture load after flaw introduction via grit particle abrasion. After abrasion, the retained surface fracture load is measured with the method documented in IEC 61747-40-4.

IEC 61747-30-4:2016(E) specifies the standard measurement conditions and measuring methods for determining the optical performance and power consumption of active matrix liquid crystal display modules with dynamic backlight units.

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.

IEC 61747-2:2015(E) applies to liquid crystal display modules such as the following:
- static/segment type liquid crystal display modules;
- passive matrix monochrome liquid crystal display modules;
- passive matrix colour liquid crystal display modules;
- active matrix monochrome liquid crystal display modules;
- active matrix colour liquid crystal display modules.
It gives details of the quality assessment procedures, inspection requirements, screening sequences, sampling requirements, and test and measurement procedures required for the assessment of liquid crystal display modules. This edition includes the following significant technical changes with respect to the previous edition:
a) This version is applicable only for liquid crystal displays.
b) All the references to IECQ and QC were removed in accordance with ISO/IEC Directives.
c) The normative references were updated.
This publication is to be read in conjunction with IEC 61747-1-1:2014.

IEC 61747-3-1:2015(E) serves as a blank detail specification (BDS) for the IEC quality assessment system and contains requirements for style and layout and minimum content of the detail specifications. These requirements are applicable when the detail specification is published (e.g. for a standard product). This edition includes the following significant technical changes with respect to the previous edition:
- the new edition was editorially changed in accordance with current ISO/IEC directives.

IEC 61747-3:2015(E) applies to liquid crystal cells of the segment type monochrome. It gives details of the quality assessment procedures, inspection requirements, screening sequences, sampling requirements and test and measurement procedures required for the assessment of liquid crystal display cells. Instead of the qualification approval procedure, the capability approval procedure can be applied for all products manufactured in a defined process. This edition includes the following significant technical changes with respect to the previous edition:
a) All the references to IECQ and QC were removed in accordance with ISO/IEC Directives Part 2, 6.7.1 and 6.7.2;
b) Updated normative references.
This publication is to be read in conjunction with IEC 61747-1-1:2014.

IEC 61747-20-2:2015(E) gives the details of the quality assessment procedures and provides general rules for the visual inspection of the non-active and active areas of monochrome matrix liquid crystal display modules by the human eye and, if necessary, through an optical microscope. Furthermore this standard includes the defect definitions and the method for visual defect inspection. This first edition cancels and replaces Clause 5 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) editorial modification was done in accordance with the ISO/IEC Directives, Part 2;
b) document number was changed to align with the new numbering structure of the IEC 61747 series.

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.

IEC 61747-40-2:2015(E) is a mechanical performance testing procedure for cover glass used in electronic flat panel displays in mobile devices. This standard is focused on the measurement of as-received edge strength via uni-axial flexure generated by a four-point bend.

IEC 61747-40-4:2015(E) is a mechanical performance testing procedure for cover glass used in electronic flat panel displays in mobile devices. This standard is focused on the measurement of as-received surface fracture load via biaxial flexure generated by ring-on-ring.

IEC 61747-40-3:2015(E) is a mechanical performance testing procedure for cover glass used in electronic flat panel displays in mobile devices. This standard is focused on the measurement of surface impact resistance via biaxial flexure generated by a ball drop.

IEC 61747-2-2:2014(E) serves as a blank detail specification (BDS) for testing and contains requirements for style and layout and minimum content of detail specifications. These requirements are applicable when the detail specification is published (e.g. for a standard product). This edition includes the following significant technical changes with respect to the previous edition:
1) The new edition was editorially changed to follow the current ISO/IEC Directives, for example:
- added the scope;
- re-arranged the numbering scheme;
- added titles to the tables;
- added an Annex A, and put some text from Clause 4 and Clause 10 in it;
- removed IECQ reference;
- deleted some unnecessary text.
2) Several words and test conditions were added in Clause 7 and Clause 8.

IEC 61747-4-1:2014(E) describes the essential ratings and characteristics of matrix colour liquid crystal display (LCD) modules. This edition includes the following significant technical changes with respect to the previous edition: Adding the contents of the IEC 61747 series, adding the TFT technical kinds, revising the electrical and optical characteristics in Table 1 and correcting some editorial errors.
This publication is to be read in conjunction with IEC 61747-1-1:2014.

IEC 61747-10-2:2014(E) lists test methods applicable to liquid crystal display devices. It takes into account, wherever possible, the environmental test methods outlined in IEC 60068. The object of this standard is to establish uniform preferred test methods with preferred values for stress levels for judging the environmental properties of liquid crystal display devices. This first edition of IEC 61747-10-2 cancels and replaces Clauses 1 and 3 of the first edition of IEC 61747-5 published in 1998. This edition constitutes a technical revision with the following significant technical changes with respect to the previous edition:
a) Examples of the test conditions have been added to each test method;
b) References cited have been updated.

IEC 61747-1-1:2014 is a generic specification for liquid crystal display devices. It defines general procedures for testing and gives general rules for the measuring methods of the electrical and optical characteristics, the rules for climatic and mechanical tests, and the rules for endurance tests. This first edition cancels and replaces the first edition of IEC 61747-1 published in 1998 and Amendment 1:2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) IEC 61747-1, has been divided into IEC 61747-1-1, Liquid crystal display devices - Part 1-1: Generic - Generic specification and IEC 61747-1-2, Liquid crystal display devices - Part 1-2: Generic - Terminology and letter symbols;
b) the contents of the terminology have been transferred to IEC 61747-1-2;
c) Annex C has been changed from normative to informative, because Tables C.1 and C.2 mismatch some of the large scale production practices of recent date;
d) References cited have been updated.

IEC 61747-1-2:2014 gives the preferred terms, their definitions and symbols for liquid crystal devices, with the object of using the same terminology when publications are prepared in different countries. This first edition cancels and replaces the first edition of IEC 61747-1 published in 1998 and Amendment 1:2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) The former IEC 61747-1, Generic specification was divided into IEC 61747-1-1, Liquid crystal display devices - Part 1-1: Generic - Generic specification and IEC 61747-1-2, Liquid crystal display devices - Part 1-2: Generic - Terminology and letter symbols;
b) In this part of IEC 61747, new terms have been added and some of the terms and the definitions have been updated.

IEC 61747-10-1:2013 lists test methods applicable to liquid crystal display devices. It takes into account, wherever possible, the mechanical robustness test methods as outlined in IEC 60068. The object of this standard is to establish uniform preferred test methods with preferred values for stress levels for judging the mechanical properties of liquid crystal display devices. This first edition of IEC 61747-10-1 cancels and replaces Clauses 1 and 2 of the first edition of IEC 61747-5 published in 1998. This edition constitutes a technical revision.

IEC 61747-40-1:2013 is a mechanical performance testing guideline for cover glass used in electronic flat panel displays in mobile devices. This document focuses on key mechanical testing performance parameters and covers mainly strength and damage resistance attributes. The test methods will focus on the cover glass level testing only.

IEC 61747-2-1:2013 serves as a Blank Detail Specification (BDS) for a high quality approval system and contains requirements for style and layout and minimum content of detail specifications. These requirements are applicable when the detail specification is published (e.g. for standard product). This second edition of IEC 61747-2-1 cancels and replaces the first edition published in 1998, and constitutes a technical revision. The main changes from the previous edition are as follows:
- several words and test conditions were added in Clause 7 and Clause 8;
- the new edition was editorially changed according to the current ISO/IEC Directives - Part 2.

IEC 61747-4:2012 describes the essential ratings and characteristics of LCD cells and passive matrix monochrome liquid crystal display modules. It does not apply to active matrix LCD cells nor to multicolour cells. This edition includes the following significant technical changes with respect to the previous edition:
- 2.1 and 3.1 of IEC 61747-4:1998 were deleted because these items are defined in IEC 61747-1;
- 2.7.6, in 2.7, Supplementary information, of IEC 61747-4:1998 was deleted because the scope of this standard is about passive matrix monochrome liquid crystal display modules;
- The item "Gray scale: digital or analog" in 2.3.1 of IEC 61747-4:1998 was changed to "Gray scale: number" because it is more accurate;
- Contrast mode: light symbol on dark background ("LOD" or "positive image") or dark symbol on light background ("DOL" or "negative image") was introduced in this part of IEC 61747 to replace the description in 2.3.1 and 3.3.1 of IEC 61747-4:1998.
This publication is to be read in conjunction with  IEC 61747-1:1998.

IEC 61747-30-1:2012 is restricted to transmissive liquid crystal display-modules using either segment, passive or active matrix and achromatic or colour type LCDs. Furthermore, the transmissive modes of transflective LCD modules with backlights ON are comprised in this document. An LCD module in combination with a touch-panel or a front-light-unit is excluded from the scope because measurements are frequently inaccurate. Touch-panels or front-light-units are removed before measurement. Throughout the main body of this standard, an integrated backlight is assumed to provide the illumination for the measurements. Deviations from this (e.g. segmented displays without integrated backlights) may usually be handled in the same way as display modules with integrated backlight, if an external backlight is provided. However, in the case where one of the two situations should be handled differently, this will be specifically stated. This first edition cancels and replaces IEC 61747-6 published in 2004. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) the document structure was brought in line with 61747-6-2; and
b) various technical and editorial changes were made.
This publication is to be read in conjunction with IEC 61747-1:1998.

IEC 61747-6-2:2011 gives details of the quality assessment procedures, the inspection requirements, screening sequences, sampling requirements, and test and measurement procedures required for the assessment of liquid crystal display modules. The purpose of this standard is to indicate and list the procedure-dependent parameters and to prescribe the specific methods and conditions that are to be used for their uniform numerical determination. The contents of the corrigendum of January 2012 have been included in this copy.

IEC 61747-5-3:2009 applies to commercially available liquid crystal displays (LCDs). This standard applies to all LCD types, including transmissive, reflective or transflective liquid crystal display (LCD) modules using either segment, passive or active matrix and achromatic or colour type LCDs that are equipped with their own integrated source of illumination or without their own source of illumination. The objective of this standard is to establish uniform requirements for accurate and reliable measurements of the following LCD parameters:
a) quasistatic strength,
b) quasistatic fatigue.
The methods described in this standard apply to all sizes, small and large, liquid crystal displays.
This publication is to be read in conjunction with IEC 61747-1:1998. The contents of the corrigendum of November 2011 have been included in this copy.

IEC 61747-6-3:2011 applies to transmissive type active matrix liquid crystal displays. This standard defines general procedures for quality assessment related to the motion performance of LCDs. It defines artifacts in the motion contents and methods for motion artifact measurement. NOTE: Motion blur measurement methods and analysis methods introduced in this standard could not be universal tools for all different LCD motion enhancement technologies due to its complexity. Users shall be notified of these circumstances.

IEC 61747-5-2:2011 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) between panel and set makers.