IEC 62977-3-5:2023

Overview

IEC 62977-3-5:2023 is an international standard published by the International Electrotechnical Commission (IEC) that specifies standardized evaluation methods for determining the colour capabilities of electronic display modules and systems. This document focuses on the objective measurement of colour accuracy, colour gamut volume, chromaticity gamut area, and the intersection of a display's colour capabilities with reference colour spaces. It applies to both emissive and transmissive direct view displays, including flat panels and curved panels with a local radius of curvature greater than 1,500 mm. Evaluations are carried out under darkroom conditions to ensure precise assessments of colour performance.

This standard is especially valuable for R&D engineers, quality control experts, and third-party reviewers engaged in electronic display development, verification, and testing. It helps to prevent miscommunication and to standardize the assessment procedures across the industry.

Key Topics

• Colour Accuracy: Methods for quantifying how faithfully an electronic display renders intended colours, facilitating comparison between the display output and reference standards.
• Colour Gamut Volume: Techniques for assessing the three-dimensional capability of a display to reproduce a broad range of colours, including in different viewing directions.
• Chromaticity Gamut Area: Analysis of a display’s ability to render colours within a specified two-dimensional reference colour space, often mapped against industry standards such as ITU-R BT.709.
• Intersection with Reference Colour Spaces: Evaluation methods to determine where and how much a display’s colour capabilities overlap with reference standards, such as sRGB or DCI-P3.
• Standard Measurement Conditions: Requirement for consistent test environments, including the use of darkroom conditions, carefully calibrated equipment, and standardized warm-up sequences for displays prior to testing.
• Applicable Input Signals: The standard applies only to typical opto-electronic transfer functions (OETFs) such as those defined in IEC 61966-2-1 (sRGB), ITU-R BT.601, ITU-R BT.709, and ITU-R BT.2020, using relative RGB input signals without absolute luminance encoding.
• Reporting Requirements: Clear guidelines on how to document, record, and report measurement results for repeatable and transparent performance evaluation.

Applications

The practical applications of IEC 62977-3-5:2023 span various facets of the electronic display industry:

• Display Development: Offers R&D teams consistent metrics to design, benchmark, and enhance display colour performance during prototyping.
• Product Testing and Verification: Enables manufacturers and independent laboratories to evaluate and certify displays, ensuring compliance with industry standards for colour representation and chromaticity.
• Quality Assurance: Facilitates sample and batch testing in pre-production environments to detect colour inconsistencies or deviations before mass manufacturing.
• Comparative Performance Analysis: Supports side-by-side evaluations of display modules and systems from different manufacturers using harmonized criteria, benefiting purchasing departments and technical reviewers.
• Consumer Electronics: Applies to televisions, monitors, digital signage, and professional displays where accurate colour rendering is critical for user experience, content creation, or broadcasting.

Related Standards

The methods and requirements outlined in IEC 62977-3-5:2023 interface closely with several other international standards, including:

• IEC 62977-2-1: Measurements of optical characteristics – guidelines for fundamental display measurements.
• IEC TS 62977-3-1: Evaluation of optical performance – methods for assessing colour difference based on viewing direction dependence.
• IEC 61966-2-1: Colour management in multimedia systems – defines sRGB colour space.
• Recommendation ITU-R BT.709 / BT.2020: Internationally recognized standards for HD and UHD television colourimetry.
• CIE 015:2018: Core document on colorimetry principles.
• CIE 168:2005: Criteria for evaluating extended-gamut colour encodings.

Summary

Implementing IEC 62977-3-5:2023 ensures that display colour capabilities are measured and communicated using internationally recognized, repeatable methods. By focusing on key performance indicators such as colour accuracy, gamut volume, and chromaticity, this standard supports the evolving need for high-quality colour reproduction in today’s electronic displays. Its alignment with other foundational standards maximizes interoperability and industry confidence in display evaluation outcomes, making it an essential reference for stakeholders in display technology.