Overview
IEC 62341-6-7:2024 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies standard measuring conditions and methodologies for evaluating the optical characteristics of OLED displays with under-screen features. This document addresses the measurement techniques for determining attributes such as reflectance, uniformity, gamma, angular chromaticity shift, luminance degradation, transmittance, and clarity for displays employing under-screen technology. The standard is particularly relevant for OLED displays in devices such as smartphones, monitors, and TVs that integrate components like under-screen cameras, under-screen fingerprint sensors, or time of flight (TOF) sensors beneath the active display area.
Incorporating under-screen features often requires the display to be partially transparent, a property that OLED technology can achieve through specific pixel structures and circuit designs. This standard provides comprehensive and consistent methods to measure the impact of these features on display performance, enabling reliable comparison and quality assurance in OLED products with under-screen elements.
Key Topics
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Measuring Conditions: Guidance on standardized environmental and darkroom conditions for testing, ensuring reproducibility across various laboratories and manufacturers.
- Temperature, humidity, and atmospheric pressure requirements
- Specific darkroom luminance conditions for accurate optical assessments
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Measuring Methods for Display Performance:
- Reflectance Difference: Techniques to measure the variation in reflectance between under-screen and standard display areas.
- Luminance and Chromaticity Uniformity: Procedures to assess and quantify uniformity across different display segments.
- Gamma Measurement: Steps to determine the gamma characteristics for consistent image reproduction.
- Angular Chromaticity Shift: Evaluation of color consistency when viewing from various angles.
- Luminance Degradation: Monitoring of brightness reduction over time, important for predicting display lifespan, especially in under-screen regions.
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Measuring Methods for Transmittance Performance:
- Transmittance: Assessing how much light passes through the display, critical for under-screen cameras or sensors.
- Clarity: Measurement using Modulation Transfer Function (MTF) and Spatial Frequency Response (SFR) to evaluate image sharpness and the impact of display pixel structures on diffraction effects.
Applications
IEC 62341-6-7:2024 offers significant value for R&D, quality assurance, and manufacturing teams in the consumer electronics, mobile device, and display panel industries. Key applications include:
- Product Development: Assists engineers in designing and optimizing OLED displays to balance transparency for under-screen features with overall display quality.
- Quality Control: Enables consistent evaluation and comparison of optical characteristics to meet performance specifications and maintain brand reputation.
- Certification and Compliance: Provides a recognized framework for demonstrating adherence to international measurement standards, facilitating market acceptance and regulatory approval.
- Performance Benchmarking: Supports benchmarking activities during procurement or supplier audits by offering standardized measurement metrics.
- Research and Innovation: Facilitates development of new under-screen features (e.g., fingerprint sensors, forward-facing cameras) while maintaining display integrity and user experience.
Related Standards
The following related international standards are referenced and complement IEC 62341-6-7:2024 for OLED and electronic display measurement:
- IEC 62341-1-2: OLED displays - Terminology and letter symbols
- IEC 62341-5-3: OLED displays - Measuring methods of image sticking and lifetime
- IEC 62341-6-2: OLED displays - Measuring methods of visual quality and ambient performance
- IEC TR 62977-2-5: Electronic display devices - Transparent displays - Measurements of optical characteristics
- IEC 62977-3-7: Electronic displays - Optical performance - Tone characteristics
- ISO 12233: Photography - Electronic still picture imaging - Resolution and spatial frequency responses
By following the requirements and methodologies detailed in IEC 62341-6-7:2024, organizations can ensure reliable, reproducible, and globally recognized evaluations of OLED displays incorporating under-screen features, thereby supporting advances in display technology and enhancing device functionality for end users.
Open preview (PDF)Organic light emitting diode (OLED) displays - Part 6-7: Measuring methods of optical characteristics for display with under-screen feature
