Overview
IEC TR 62595-1-3:2019 is a technical report published by the International Electrotechnical Commission (IEC) focusing on display lighting units with arbitrary shapes, primarily flexible lighting sources (FLSs). As the demand for flexible, stretchable, and conformable displays grows - particularly in electronics and wearable technology - it is crucial to address new challenges in the characterization and measurement of light emission from lighting units that are no longer flat, but exhibit various geometric curvatures.
This document provides a comprehensive framework for understanding and modeling the light emission properties of curved and flexible lighting units. It considers critical aspects such as spatial and angular uniformity of luminance and colour, and the implications of arbitrary shapes on measurement accuracy using current technologies. IEC TR 62595-1-3:2019 serves as a foundational guideline for developing future measurement standards, supporting the evolving requirements of innovative display and lighting applications.
Key Topics
- Flexible Lighting Units (FLSs): Covers the various forms of FLSs including foldable, bendable, rollable, and stretchable types. Flexible lighting units differ from traditional rigid lighting units due to their unique mechanical and optical characteristics.
- Optical Measurement Challenges: Highlights complexities in measuring optical quantities (such as luminance, luminance uniformity, chromaticity, and angular light distribution) on curved surfaces versus flat surfaces.
- Measurement Models and Methods:
- Modeling and analyzing the projection of the measurement field (MF) on curved surfaces.
- Geometrical characterization of FLSs with single and arbitrary curvatures.
- Addressing the effects of curvature on depth of focus and measurement device accuracy.
- Spatial and Angular Characteristics: Examination of spatial uniformity, angular distribution of luminance and colour, and how display unit curvature influences perceived optical performance.
- Implications for Standards Development: Provides guidance for the development of future standards, especially for new generations of flexible liquid crystal panels and related display techniques.
Applications
IEC TR 62595-1-3:2019 is significant for a wide range of stakeholders in the electronics, display, and lighting industries, including:
- Manufacturers of Flexible Displays: Enables accurate evaluation of curved OLED and LED panels used in televisions, smartphones, advertising displays, and wearable devices.
- Automotive and Aerospace Sectors: Supports integration of flexible lighting units into vehicles and aircraft where lightweight, adaptive, and durable lighting or display elements enhance design and functionality.
- Healthcare and IoT Solutions: Provides a foundation for flexible light-based devices such as medical wearables or smart textiles where conformable and biocompatible lighting is essential.
- Measurement Equipment Developers: Offers insights into adapting or designing new luminance and chromaticity measurement devices capable of reliable performance on non-planar surfaces.
- Research and Development: Serves as an essential resource for academic and industrial research on next-generation flexible light sources and their standardization requirements.
Related Standards
Professionals applying IEC TR 62595-1-3:2019 will find value in consulting related international standards, including but not limited to:
- IEC 62715 Series: Focuses on flexible display devices, including terminology, measuring methods for optical performance, visual assessment, and mechanical/environmental testing (e.g., IEC 62715-1-1, 62715-5-1, 62715-6-1).
- IEC 62899 Series: Pertains to printed electronics, which encompass technologies crucial for flexible lighting unit manufacturing and integration.
- IEC TS 62715-5-2: Provides further measuring methods of optical characteristics from the vantage point for curved displays.
- JEITA Et4501: Addresses printed electronics – OLED elements relevant to FLS production.
By referencing IEC TR 62595-1-3:2019 alongside these standards, organizations can ensure comprehensive compliance and stay at the forefront of flexible lighting and display technology development.