IEC TS 62715-5-4:2019

Overview

IEC TS 62715-5-4:2019 is an international technical specification developed by the International Electrotechnical Commission (IEC) for flexible display technologies. This standard defines the measuring conditions and methods for determining blur when objects are viewed through flexible transparent display modules. The focus is specifically on displays with a constant radius curvature about a single axis and in a static mechanical state. The specification ensures consistent evaluation of optical quality, which is vital for both manufacturers and end users within emerging flexible display markets.

Key Topics

• Blur in Flexible Transparent Displays: Guidance on quantifying the unclear or indistinct outlines (blur) of objects viewed through a display.
• Measurement Conditions:
  • Standard environmental conditions (temperature, humidity, atmospheric pressure)
  • Darkroom setup to minimize background luminance
  • Precise mounting and alignment of the display to ensure repeatable measurements
• Test Setup:
  • Use of reference display devices and light measuring devices (LMDs), such as luminance meters or spectroradiometers, for accurate blur assessment
  • Ensuring a constant radius curvature and alignment accuracy for reproducible results
• Blur Measurement Method:
  • Implementation of a black-to-white test pattern displayed behind the device under test (DUT)
  • Stepwise procedures for calculating the width and degree of blur, including the use of Gaussian blur models and convolution techniques to quantify results
  • Requirements for field of measurement, sampling distances, and data reporting

Applications

• Display Quality Control: Facilitates quality assurance for manufacturers of flexible transparent displays used in consumer electronics, automotive interfaces, signage, and emerging wearable technology.
• Research and Development: Provides laboratories and R&D engineers with standardized methods to benchmark new materials and designs for flexible transparent displays.
• Product Comparison and Certification: Enables consistent, comparable results across different products and manufacturers, supporting procurement, specification, and certification processes.
• Innovation Enablement: Supports the evaluation of innovative display concepts by offering an industry-accepted methodology for assessing see-through image clarity.

Related Standards

• IEC 62715-1-1 - Flexible display devices: Terminology and letter symbols
• IEC 62715-5-1 - Flexible display devices: Measuring methods of optical performance
• IEC 62341-6-4 - Organic light emitting diode (OLED) displays: Measuring methods of transparent properties
• ISO 11664-2 - Colorimetry: CIE standard illuminants
• ISO 12233:2017 - Photography: Electronic still picture imaging – Resolution and spatial frequency responses

Practical Value

By adhering to IEC TS 62715-5-4:2019, stakeholders in the flexible display sector gain access to reliable and repeatable methods for quantifying visual blur-an essential optical property for transparent displays. This standard is crucial for maintaining product quality, enhancing end-user experience, and supporting the growing use of flexible and transparent electronic displays across various industries.

Keywords: flexible display devices, transparent displays, blur measurement, IEC 62715-5-4, optical performance, display quality, measurement standard, display technology.