WG 8 - TC 110/WG 8

IEC 62715-6-22:2023 specifies the standard measurement conditions and methods for determining the surface crease and waviness for the evaluation of foldable displays. The measurement methods are used to specify the extent of geometrical distortions in foldable display surfaces. This document applies to foldable display panels and modules (e.g. in-folding and out-folding) with one axis.

IEC TR 62715-6-21:2022, which is a technical report, provides information about various folding types and hinge structures of foldable products which can affect the durability of a foldable panel. This document focuses only on the issues concerning the foldable products and will not include product parts that do not affect display durability such as speakers, batteries, communication ports.

IEC 62715-2:2022(E) specifies the essential ratings and characteristics of flexible display modules.

IEC 62715-6-3:2020 (E) is to define the standard test methods to evaluate the mechanical robustness of flexible display modules, especially mechanical robustness regarding impact and hardness, which include displays such as liquid crystal displays (LCDs), e-paper, and organic light emitting diode (OLED) displays, against external forces applied to a panel.

IEC TS 62715-5-4:2019 (E) specifies the measuring conditions and measuring methods for determining the blur of objects when viewed through a flexible transparent display. This document mainly applies to flexible transparent display modules that have a constant radius curvature about a single axis. The display is measured in a static mechanical state.

IEC 62715-6-1:2018 is available as IEC 62715-6-1:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62715-6-1:2018 defines the standard test methods to evaluate the mechanical stability of flexible display modules, specifically mechanical stability against deformation, such as bending, rolling, twisting, and stretching. Display modules include displays such as LCD, e-paper, and OLED. This document takes into account, wherever possible, the mechanical test methods outlined under mechanical stress. This second edition cancels and replaces the first edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) changed the part title to differentiate it from other parts;
b) added new bending testing methods;
c) added detailed testing procedures.

IEC 62715-6-2:2017(E) specifies testing methods for evaluating the environmental endurance of flexible display panels and modules for use, storage and transport under assumed usage environment. This part of IEC 62715 is applicable to flexible display panels and modules such as liquid crystal display devices (LCDs), electric paper display devices (EPDs), and organic light emitting diode display devices (OLEDs). This part of IEC 62715 will also be suitable for flexible panel or module with mechanical operation.

IEC 62715-5-1:2017(E) specifies the standard measuring conditions and measuring methods for determining the optical performance of flexible displays in the dark or under ambient illumination. This document mainly applies to display modules that are bendable about one axis. The display is measured in a static mechanical state. The measuring methods apply to monochrome or colour displays with a single radius of curvature of 35 mm or greater.

IEC 62715-5-3:2017(E) provides the framework and procedures for performing the visual assessment of flexible display devices.
Visual assessment stipulated in this document is applicable to flexible display modules in the following states:
- initial states and ageing states under standard ambient conditions,
- mechanically or environmentally stressed conditions,
- states after mechanical endurance test(s), after environmental endurance test(s) and after a combination of mechanical and environmental endurance tests.
Visual assessment is performed by comparing a test sample to a limit sample or to a set of grade samples. This document provides the framework and procedures for visual assessments that use a limit sample or a set of grade samples. This document describes the framework and procedure that are followed while preparing limit samples and a set of grade samples. This document also describes visual assessment when limit samples and grade samples are not available for the same type of defect.
This document provides sets of test patterns that can be used in visual assessments.

IEC TS 62715-5-2:2016(E) specifies the general rules and the details of optical measuring methods from a fixed point (the so-called vantage point) for curved emissive and transmissive type displays such as OLED and LCD in dark room conditions. This document focuses on concave shape large screen displays (non-portable) around a horizontal and/or vertical axis with fixed or variable curvature radius. The measuring method stipulated in this technical specification is applied to the curved display modules under the following states:
- vantage-point luminance variation by viewing angles
- vantage-point contrast ratio variation by viewing angles
- vantage-point chromaticity variation of white colour by viewing angles
- vantage-point colour gamut area variation by viewing angles
- vantage-point chromaticity variation of primary colours by viewing angles
- luminance uniformity and its uniformity variation by viewing angles
- chromaticity uniformity and its uniformity variation by viewing angles
- viewing angle of half-luminance
- viewing angle of half-contrast.

IEC 62715-6-1:2014 is to define the standard test methods to evaluate the mechanical stability of flexible display modules which include displays such as LCD, e-paper, and OLED. It takes into account, wherever possible, the mechanical test methods outlined under mechanical stress.

IEC 62715-1-1:2013 gives the preferred terms, their definitions and symbols for flexible display devices, with the object of using the same terminology when standards are prepared in different countries.