Overview
IEC 61747-30-5:2019 is an international standard published by the International Electrotechnical Commission (IEC) that establishes the measurement conditions and methods for determining the optical properties of transmissive transparent liquid crystal display (LCD) modules. This standard is critical for ensuring reliable, repeatable, and comparable results when evaluating transparent LCD modules, particularly those used in high-precision display applications.
Key optical properties addressed include transmittance, haze, and image distortion. The document provides guidance on standard environmental and measurement conditions, apparatus configuration, and detailed measurement procedures, supporting manufacturers, researchers, and testing laboratories in the display industry.
Key Topics
Standard Measurement Conditions
- Environmental conditions: Prescribes temperature (25 °C ± 3 °C), relative humidity (25% RH to 85% RH), and atmospheric pressure (86 kPa to 106 kPa).
- Darkroom conditions: Ensures low background luminance to prevent interference in optical measurements.
Measurement of Optical Properties
- Transmittance: Evaluates the ratio of light passing through the LCD module to the incident light, including the calculation of uniformity across multiple points.
- Haze: Assesses the percentage of transmitted light scattered away from the direction of the incident beam, crucial for clarity and display quality.
- Image Distortion: Includes evaluation of parameters such as sharpness, color shift, and contrast ratio offset, using precise test equipment and reference objects.
- Measurement Equipment: Procedures use instruments like luminance meters, spectroradiometers, integrating spheres, and standardized light sources.
- Measurement points: Specifies multiple locations on the display module for comprehensive sampling and uniformity checks.
Reporting and Documentation
- Emphasizes thorough reporting of test conditions, measurement distance, panel specifications, and any deviations to support transparency and traceability.
Applications
IEC 61747-30-5:2019 provides practical value in several areas of the electronics and display industries:
- Quality Assurance: Enables manufacturers of transparent transmissive LCD panels to validate product performance and consistency against recognized international benchmarks.
- Product Development: Supports R&D teams in optimizing panel design for improved transparency and minimal haze, which is essential for applications like augmented reality (AR), heads-up displays, and advanced retail or presentation screens.
- Supply Chain and Procurement: Offers standardized evaluation criteria for buyers and specifiers to compare LCD modules from different suppliers.
- Certification and Compliance: Ensures that products meet global requirements for optical quality, facilitating international trade and acceptance in regulated markets.
- Academic and Industrial Research: Provides a reference methodology for studies concerning the optical properties of advanced transparent displays.
Related Standards
Several standards are referenced and related to IEC 61747-30-5:2019, which collectively form a foundation for consistent measurement practices in the field of liquid crystal display technology:
- IEC 61747-1-2: Liquid crystal display devices – Part 1-2: Generic – Terminology and letter symbols
- IEC 61747-30-1: Liquid crystal display devices – Measuring methods for liquid crystal display modules – Transmissive type
- ISO 11664-1: Colorimetry – CIE standard colorimetric observers
- ISO 11664-2: Colorimetry – CIE standard illuminants
- ISO 14782: Plastics: Determination of haze for transparent materials
Conclusion
IEC 61747-30-5:2019 is essential for organizations involved in the development, testing, and certification of transmissive transparent LCD modules. By adhering to its defined measurement methods and reporting protocols, stakeholders can ensure product reliability, comparability, and high optical performance, adding significant value across the transparent LCD supply chain.