IEC 62341-6-2:2015

Overview

IEC 62341-6-2:2015 is the international measurement standard for evaluating the visual quality and ambient performance of organic light emitting diode (OLED) display modules and panels, with a primary focus on colour display modules. The document defines standard measurement conditions and methods for lab and field testing of OLED visual characteristics under both dark-room and ambient illumination states. This is Edition 2.0 (2015) and contains technical updates from the prior edition, including revised content in clause 7.4, changes to Annex C, and the addition of Annex B.

Key topics and technical requirements

The standard organizes test methods and requirements to ensure repeatable, comparable results. Major technical topics include:

• Standard measuring conditions

  • Environmental and setup conditions for reproducible tests (dark-room and ambient lighting).
  • Requirements for equipment state and starting conditions before measurement.

• Visual inspection of static images

  • Classification and reference examples for visible defects (subpixel defects, line defects, mura).
  • Standard inspection methods, room/setup geometry and inspection criteria for human visual checks.

• Electro‑optical measurements under ambient illumination

  • Reflection measurements (hemispherical diffuse reflectance and directional reflectance factor).
  • Ambient contrast ratio measurement procedures to quantify readability in ambient light.
  • Display daylight colour measurement methods and reporting for colour appearance under ambient illumination.
  • Daylight colour gamut volume: procedures for measuring and calculating colour gamut volume in perceptual spaces (CIELAB), including reporting guidance.

• Informative annexes

  • Annex A: methods to measure relative photoluminescence contribution from displays.
  • Annex B: diagnostic procedures for luminance dependence on ambient illumination.
  • Annex C: algorithm and procedure for calculating daylight colour gamut volume.

Note: IEC 62341-6-2 defines measurement geometries, sample sets for gamut calculations, and reporting formats to enable consistent characterization without prescribing pass/fail thresholds.

Practical applications and users

IEC 62341-6-2 is used by organizations that design, manufacture, test, or certify OLED displays:

• Display manufacturers and module integrators - for product development, quality control and acceptance testing.
• Test laboratories and OEM QA teams - to perform standardized visual and electro-optical characterization.
• Mobile device, automotive and consumer electronics OEMs - to evaluate display readability, colour performance and ambient behavior in end‑products.
• Conformity assessment bodies - for consistent measurement procedures when validating claims about display visual quality and ambient performance.

Related standards

• Part of the IEC 62341 series for OLED displays (see IEC catalogue for other parts addressing electrical, reliability and optical test methods).
• Cross-references include normative measurement and colorimetry documents cited within the standard.

Keywords: IEC 62341-6-2, OLED displays, visual quality, ambient performance, measurement methods, colour gamut, ambient contrast ratio, reflection measurement, mura, subpixel defects.