IEC 62977-2-2:2020

Overview

IEC 62977-2-2:2020 is an International Electrotechnical Commission (IEC) standard that defines standardized measurement methods for evaluating the optical characteristics of electronic displays under both indoor and outdoor illumination conditions. The standard ensures consistency and reliability in testing across various display types, including emissive, transmissive, and reflective technologies. By specifying controlled measurement environments, illumination geometries, and reference illumination spectra, this standard allows manufacturers, designers, and evaluators to objectively assess the ambient performance of flat-screen displays. Accurate measurement of photometric and colorimetric properties in realistic ambient conditions supports quality assurance, product development, and compliance with industry requirements.

Key Topics

• Measurement Environments:

  • Outlines standard conditions for temperature, humidity, and atmospheric pressure during optical testing.
  • Prescribes simulation of indoor (e.g., office) and outdoor (e.g., daylight) lighting conditions relevant to electronic display use.

• Illumination Geometries:

  • Details standard lighting geometries, including diffuse and directional light, used to assess reflective properties and visibility in ambient environments.
  • Specifies positioning and spectral characteristics of light sources to ensure reproducibility.

• Optical Quantities Evaluated:

  • Includes luminance, contrast ratio, chromaticity, and color gamut.
  • Details how to measure these characteristics using standardized test patterns and environmental setups.

• Reflection and Ambient Performance:

  • Methods for measuring and calculating reflection properties of display surfaces under various illumination levels.
  • Simulates real-world scenarios to determine how well electronic displays perform with ambient light present.

• Standardized Reporting:

  • Requires documentation of all measurement conditions, setup, and results for transparency and comparison.
  • Includes recommendations for handling deviations from prescribed test conditions.

Applications

IEC 62977-2-2:2020 is essential for:

• Display Manufacturers:

  • Enables reliable optical performance testing under ambient conditions used in product development, quality control, and performance benchmarking.
  • Supports claims about visibility and readability in marketing material.

• Third-party Test Labs:

  • Provides consistent methodologies for evaluating displays' ambient performance, facilitating credible third-party certification and compliance checks.

• Procurement and Regulatory Bodies:

  • Offers objective criteria to compare display products across different brands or technologies based on real-world usage scenarios.

• System Integrators and OEMs:

  • Assists in selecting displays that meet performance requirements for specific applications, such as digital signage, automotive displays, mobile devices, and monitors.

• End-users and Buyers:

  • Helps in understanding which displays offer superior visibility, color fidelity, and contrast under typical ambient environments.

Related Standards

IEC 62977-2-2:2020 complements and references several other standards related to electronic display measurements and colorimetry:

• IEC 62977 Series - Addresses other measurement aspects for electronic displays.
• IEC 61747-6-2 - LCD optical measurement methods.
• IEC 62341-6-2 - OLED display optical measurements.
• IEC 61988-2-2 - Plasma display panel measurements.
• IEC 62679-3-1 - Electronic paper display measurements.
• ISO/CIE 11664 Series - Colorimetry standards, including CIE Lab* color space.
• IEC 61966-2-1 - sRGB color space for multimedia equipment.
• CIE 15 - Defines colorimetric calculations and standard illuminants.

For a comprehensive list, consult the full IEC 62977 series and referenced international color measurement and lighting standards.

Adhering to IEC 62977-2-2:2020 ensures accurate assessment of electronic display performance in ambient light, supporting quality assurance and market transparency for both manufacturers and consumers. For up-to-date publications and related documents, consult the IEC webstore.