IEC 62629-52-1:2024

Overview

IEC 62629-52-1:2024 is an international standard from the IEC (International Electrotechnical Commission) that specifies the fundamental optical measurement methods and conditions for aerial displays, a type of 3D display technology that forms real images in mid-air. The standard establishes consistent procedures for determining key optical properties such as luminance, luminance non-uniformity, contrast ratio, chromaticity, and the spatial characteristics of the aerial image. It does not cover image quality metrics like modulation transfer function (MTF) or resolution, focusing solely on the core optical performance relevant for both manufacturers and developers of aerial display systems.

Key Topics

• Aerial Display Definitions: The document provides precise terminology for aerial display systems, including concepts such as the aerial image area (AIA), design viewing space (DVS), design viewing position (DVP), hardware reference point (HRP), floating distance, and design viewing distance. This ensures clear and uniform communication in technical and commercial settings.

• Measurement Conditions:

  • Standard Environmental Conditions: Tests should be performed under controlled temperatures (25 °C ± 3 °C), humidity (25% to 85%), and atmospheric pressure (86 to 106 kPa).
  • Darkroom Requirement: Background luminance must be less than 1/20 of the minimum display luminance to ensure accurate optical measurements.
  • Equipment Requirements: Measurement setups employ light measuring devices (LMD), such as spectroradiometers and colorimeters, and goniometers for precise angle positioning.

• Measurement Methods:

  • Position and Size of the Aerial Image: Use of geometrical test patterns, placement of measurement points, and employment of biaxial goniometers to assess the precise spatial characteristics of aerial images.
  • Luminance and Uniformity: Procedures for measuring the brightness of the image at multiple points and evaluating uniformity.
  • Contrast Ratio and Chromaticity: Methods to assess the display's ability to differentiate between dark and bright, as well as color accuracy across the viewing space.

• Reporting: Emphasis on thorough documentation of measurement conditions and results, fostering transparency and repeatability.

Applications

The standardized optical measurement methods specified in IEC 62629-52-1:2024 are vital for:

• Product Development: Manufacturers of aerial 3D displays use these defined measurement procedures to objectively characterize display performance, optimize designs, and benchmark against industry requirements.
• Quality Assessment and Control: Ensuring product quality and consistency through repeatable, internationally recognized test methods.
• Compliance and Certification: Supporting compliance with global standards, regulatory frameworks, and facilitating international trade or procurement of aerial display technologies.
• Research and Innovation: Enabling academic and industrial research into new aerial display architectures and optical enhancements.
• Procurement and Specification: Providing clear criteria for organizations seeking to integrate aerial displays into solutions in sectors such as automotive, retail, public information, and entertainment.

Related Standards

• IEC 62629-1-2:2021, 3D Display Devices – Terminology and Letter Symbols: Provides general terms and symbols relevant to 3D displays.
• ISO/CIE 19476: Details characterization methods for illuminance and luminance meters, crucial for LMD calibration.
• CIE 233, CIE 250: Address measurement uncertainties and procedures in spectroradiometry.
• IEC TR 62629-51-1: Offers further insights into the principles and optical components of aerial displays.

Referencing these related standards ensures comprehensive, harmonized measurements and supports interoperability and innovation within the evolving field of 3D aerial display technology.