IEC 62715-5-1:2017

Overview

IEC 62715-5-1:2017 - Flexible display devices: Part 5-1 Measuring methods of optical performance defines standardized conditions and methods to measure the optical performance of flexible displays. The standard applies to bendable display modules that are bendable about a single axis, measured in a static mechanical state, and having a single radius of curvature of 35 mm or greater. It covers measurements performed in a dark room and under ambient illumination for both monochrome and colour displays.

Key topics and technical requirements

The standard specifies measurement setups, equipment and procedures for assessing optical parameters. Key topics include:

• Standard measuring conditions
  • Environmental and setup conditions for reproducible testing
  • Standard ambient illumination spectra and geometries
• Measuring equipment and configurations
  • Display mounting for uniformity and viewing-direction tests
  • Light measuring devices (photometers, colorimeters, spectroradiometers)
  • Light source configurations: hemispherical diffuse, directed, ring illumination
• Dark-room optical measurements
  • Luminance and luminance uniformity (screen-centre and field uniformity)
  • Contrast ratio and its measurement
  • Chromaticity, colour uniformity, and colour gamut area
  • Peak white correlated colour temperature (CCT)
  • Viewing-direction dependence of luminance and colour
  • Cross-talk behavior with display in bent state
• Ambient-light optical measurements
  • Reflection measurements and specular/diffuse effects
  • Ambient contrast ratio and methods to evaluate display visibility under illumination
  • Ambient display colour and ambient colour gamut volume, including calculation procedures for gamut volume in CIELAB space
• Reporting and evaluation
  • Defined measurement positions, test patterns and reporting formats for consistent comparison

Practical applications

IEC 62715-5-1 is designed to ensure consistent, repeatable optical characterization of flexible/bendable displays. Typical uses:

• Product validation and acceptance testing for flexible OLED, e-paper, and other bendable modules
• R&D performance benchmarking during design and materials selection
• Quality assurance in manufacturing to verify luminance, colour and uniformity targets
• Comparative testing for procurement specifications and certification labs
• Visibility and ergonomics assessment for devices used in ambient lighting

Who should use this standard

• Display manufacturers and module integrators
• Optical test laboratories and certification bodies
• OEMs developing foldable or curved consumer electronics (phones, wearables, automotive displays)
• QA engineers, product managers and procurement specialists specifying optical performance

Related standards (if applicable)

• Other parts of the IEC 62715 series covering mechanical, electrical or reliability aspects of flexible displays
• National or international display measurement guidelines and CIE recommendations for colour and photometric testing

Keywords: IEC 62715-5-1, flexible display devices, measuring methods of optical performance, luminance uniformity, contrast ratio, chromaticity, ambient illumination, viewing direction, colour gamut volume.