Overview
IEC TR 62977-5-2:2021, published by the International Electrotechnical Commission (IEC), addresses the visual assessment of electronic displays with a focus on colour discrimination according to viewing direction. As part of the IEC 62977 series for electronic display standards, this Technical Report presents a guideline for visually assessing changes in colour, luminance, and image structure in display devices as the viewer’s position shifts. This method uses specially designed test patterns and human observation to supplement traditional physical measurement approaches.
The standard is designed to identify image quality issues caused by variations in viewing angle, providing insights that support but do not replace quantitative performance tests. Visual assessments are influenced by both test pattern parameters and display setup conditions, reflecting a more holistic understanding of the user experience.
Key Topics
- Visual Assessment Methods: Describes structured procedures for evaluating how display characteristics-such as contrast, colour shift, and resolution-change as the viewing angle is altered.
- Test Patterns: Utilizes a variety of colour test patterns based on both chromatic and achromatic references, including variants inspired by the Macbeth colour chart. Test patterns are designed to provoke visible differences under various viewing directions.
- Observer Variability: Acknowledges that human perception of colour is complex and depends on several individual factors, including adaptation, experience, and observer fatigue.
- Measurement Equipment: The visual method supplements traditional use of light measuring devices (LMDs), helping to correlate human visual response with objective, instrument-based results.
- Interpretation of Results: Provides experimental frameworks for evaluating and presenting assessment results, considering statistical variations amongst observers.
Applications
The visual assessment method outlined in IEC TR 62977-5-2:2021 is highly relevant to:
- Display Manufacturers and Developers: Used during product development and quality assurance to identify visual flaws such as colour shift and diminished contrast that may not be captured by instruments alone.
- Display Calibration and Testing Laboratories: Supports comparative analysis alongside physical measurements, ensuring a thorough assessment of display quality from both human and technical perspectives.
- Standardization and Compliance: Acts as a reference point in aligning product features with industry best practices regarding display performance for various viewing angles.
- Consumer Electronics Evaluation: Useful in benchmarking televisions, monitors, and other displays, especially where wide or atypical viewing angles are expected (e.g., in shared spaces or public displays).
- Broadcast and Media Industries: Helps ensure consistent and reliable image quality in various real-world scenarios, supporting viewer satisfaction and professional content delivery.
Related Standards
- IEC 62977 Series: The broader series provides standardized methods for the measurement and assessment of electronic display characteristics.
- IEC TS 62977-3-1: Details physical measurement techniques for display viewing direction characteristics.
- IEC 61747, IEC 62341: Include additional methods for visual assessments and performance testing in display technology.
- ITU-R BT.500-13: Referenced as a foundation for the single stimulus method applied in visual assessments.
- IDMS:2012 (Information Display Measurements Standard): Offers comprehensive procedures for evaluating various aspects of display performance.
For organizations seeking more consistent, meaningful, and practical evaluations of display quality-especially as it relates to human perception at different viewing angles-IEC TR 62977-5-2:2021 is an essential reference aligning with evolving industry and user expectations for electronic displays.
Keywords: electronic display standards, visual assessment, colour discrimination, viewing direction, IEC TR 62977-5-2, display performance, test patterns, image quality, human perception, display testing standards.