IEC 62899-502-2:2019

Overview

IEC 62899-502-2:2019 - Printed electronics, Part 502-2 - defines combined mechanical and environmental stress test methods for flexible OLED elements fabricated by printing processes. The standard provides methods to subject printed, flexible organic light emitting diode (OLED) elements to mechanical deformation (bending and rolling) together with environmental exposure, and to measure the resulting optical, electrical and mechanical performance changes.

Key points:

• Applies to flexible OLED elements made using printing methods.
• Specifies combined mechanical (deformation) and environmental stress tests.
• Focuses on reliability and quality assessment for foldable, rollable or conformable printed OLED devices.

Key Topics and Technical Requirements

The standard organizes testing and measurement to enable repeatable quality assessment. Main technical topics include:

• Mechanical stress tests
  • Cyclic bending (cyclic bending test)
  • Static bending (static bending test)
  • Dynamic and static rolling (rolling tests)
• Combined mechanical + environmental testing
  • Procedures for subjecting samples to deformation while controlling temperature and atmospheric conditions
  • Recovery and operating condition definitions
• Measurements and analysis
  • Sample preparation for optical and electrical measurements
  • Visual inspection and mechanical status assessment
  • IVL (current‑voltage‑luminance) characteristics and luminous flux measurements
• Test apparatus and configuration
  • Structure of measuring equipment and examples of apparatus for bending and rolling tests
• Standard and referee atmospheric/operating conditions
  • Guidance on standard conditions for repeatable referee measurements and tests
• Normative annexes
  • Annex A: IVL measurement methods
  • Annex B: Luminous flux measurement methods

Note: IEC 62899-502-2 references related IEC standards for measuring methods, environmental testing, and flexible display mechanical tests.

Practical Applications and Who Uses This Standard

IEC 62899-502-2 is intended for stakeholders involved in the development, manufacturing and evaluation of printed flexible OLED products:

• OLED manufacturers and process engineers - to validate printed device robustness under bending/rolling and environmental stress.
• Quality control and reliability labs - to implement standardized test procedures for batch acceptance and failure analysis.
• Product designers and OEMs - to verify design durability for foldable, rollable or conformable lighting and display applications.
• Test houses and certification bodies - to provide objective, repeatable test reports for supplier qualification and compliance.
• R&D and material suppliers - to compare material/process choices and characterize deformation-related failure modes.

Related Standards

Normative references cited in IEC 62899-502-2 include (selection):

• IEC 60068-1:2013 (Environmental testing - General)
• IEC 60068-2-2 (Dry heat)
• IEC 62341 series (OLED display measurement methods)
• IEC 62715 series (Flexible display measurement and mechanical tests)
• IEC 62899-502-1 (Mechanical stress testing of OLED elements)
• IEC 62922 (OLED panels for general lighting)

Keywords: IEC 62899-502-2, flexible OLED, printed electronics, mechanical stress test, cyclic bending, rolling test, environmental stress testing, IVL, luminous flux, OLED quality assessment.