Overview
IEC TS 62715-5-2:2016 is a technical specification published by the International Electrotechnical Commission (IEC) that defines standardized optical measurement methods for curved flexible display devices, such as concave-shaped OLED and LCD modules. The standard focuses on large, non-portable curved displays with fixed or variable curvature radii and provides clear guidance for measuring key optical characteristics from a fixed vantage point, replicating typical real-world viewing conditions. IEC TS 62715-5-2 is intended to ensure consistent evaluation of critical display attributes-such as luminance, contrast, chromaticity, and uniformity-when assessing the performance of curved display modules.
Key Topics
- Vantage Point Measurement: Standardizes measurement from a single fixed observer point, ensuring reproducibility when evaluating curved displays.
- Curved Display Types: Applies to concave, large-format, non-portable displays (e.g., curved TVs and monitors) with curvature along a horizontal and/or vertical axis.
- Measuring Conditions: Specifies measurements in dark room conditions, under controlled temperature, humidity, and atmospheric pressure, to guarantee reliable and comparable results.
- Key Optical Characteristics:
- Luminance variation by viewing angle
- Contrast ratio variation by viewing angle
- Chromaticity variation of white and primary colors by viewing angle
- Color gamut area variation by viewing angle
- Luminance and chromaticity uniformity and their variations by viewing angle
- Viewing angles for half-luminance and half-contrast
- Measurement Procedures: Details equipment setup, such as the use of non-contact light measurement devices (LMDs), standardized measuring distances (typically 3V, where V is screen height), and specific measurement points and test patterns for thorough coverage.
- Reporting Requirements: Establishes recommendations for consistent documentation and reporting of measurement environments, configurations, and results.
Applications
IEC TS 62715-5-2:2016 is widely applicable across industries that design, manufacture, or test curved display technologies. Key areas of practical value include:
- Display Manufacturing: Enables display manufacturers to benchmark and optimize the optical performance of curved OLED and LCD displays, ensuring compliance with international quality expectations.
- Quality Control: Provides R&D and QA teams with standardized procedures to evaluate visual performance from typical viewing positions, addressing real-world user experiences.
- Product Comparison: Assists buyers, integrators, and OEMs in comparing performance data across different brands and models of curved displays using objectively measured optical parameters.
- Certification and Compliance: Supports conformity assessment processes for curved display devices, facilitating market access and regulatory approvals.
- Research and Development: Guides the testing of prototype or custom curved display modules, especially for public installations, control rooms, or advanced entertainment systems.
Related Standards
For comprehensive implementation and further reference, the following related IEC standards are relevant:
- IEC 62715-1-1: Flexible display devices – Part 1-1: Terminology and letter symbols (provides key definitions used throughout IEC TS 62715-5-2).
- IEC 62715 Series: Covers a broader range of flexible display device specifications, including various aspects of device performance, reliability, and interoperability.
- CIE Publications: For procedures related to colorimetry and luminance, integration with guidelines from the International Commission on Illumination (CIE) may be necessary.
- ISO/IEC Directives: General guidance on international standardization, document drafting, and harmonization across electronics and optical measurement fields.
IEC TS 62715-5-2:2016 plays a crucial role in unifying the methods for testing and reporting on the optical performance of curved display devices. By following these standardized procedures, stakeholders can ensure that curved display products meet the rising expectations of image quality, consistency, and user experience in today’s competitive display market.