ASTM E1336-11(2023) PDF

Overview

ASTM E1336-11(2023), "Standard Test Method for Obtaining Colorimetric Data From a Visual Display Unit by Spectroradiometry," establishes a precise methodology for the instrumental characterization of the color and brightness of visual display units (VDUs), such as LCDs, CRTs, and electroluminescent displays. Developed by ASTM International, this standard outlines the requirements for obtaining and processing spectroradiometric data to derive standardized colorimetric measurements using CIE color scales.

By following this test method, professionals ensure reliable color measurement of self-luminous displays, an essential factor in quality control, performance evaluation, and calibration in industries where display accuracy is critical.

Key Topics

• Purpose of Spectroradiometry: The method centers on obtaining spectroradiometric data for calculating CIE tristimulus values and other color coordinates, essential for describing and comparing the colors presented by display screens.
• Applicable Devices: The procedure covers all types of VDUs, including CRTs, LCDs, and ELDs, regardless of their spectral characteristics.
• Measurement Parameters:
  • Selection of measurement geometry (radiance or irradiance)
  • Spectral parameters (bandwidth, wavelength interval, spectral region)
  • Usage of appropriate calibration sources for accuracy (e.g., tungsten-filament lamps, mercury arc lamps)
• Calculation Methods:
  • Derivation of CIE chromaticity coordinates and absolute luminance values based on the 1931 CIE Standard Observer
  • Modifications to standard calculation procedures to accommodate displays with narrow or discontinuous spectra
• Calibration and Verification: Emphasizes the need for physical standards and regular verification of zero scales, radiometric scales, and wavelength scales to ensure the consistency of results.
• Reporting Requirements: Specifies comprehensive documentation, including VDU type, measurement setup, spectral parameters, and computed results, all in SI units.

Applications

This standard is highly relevant for:

• Display Technology Manufacturers: To ensure the color and brightness of displays meet strict quality and consistency criteria across product batches.
• Quality Assurance and Calibration Laboratories: For routine testing, traceability, and certification of display units using accepted international color measurement protocols.
• Research and Development: In the development of innovative displays or improving existing visual technologies, precise colorimetric data is critical for product differentiation and technological advancement.
• Certification & Regulatory Compliance: Supporting adherence to international requirements dictated by organizations such as the CIE and IEC, as well as satisfying customer and industry demands for color accuracy.

By using ASTM E1336, organizations benefit from standardized measurement procedures, improved data comparability, and enhanced trust in the performance of display products.

Related Standards

• ASTM E308: Practice for Computing the Colors of Objects by Using the CIE System
• ASTM E1341: Practice for Obtaining Spectroradiometric Data from Radiant Sources for Colorimetry
• ASTM E284: Terminology of Appearance
• CIE Publications:
  • CIE No. 15.2: Colorimetry
  • CIE No. 18: Principles of Light Measurements
  • CIE No. 63: Spectroradiometric Measurement of Light Sources
• IEC Publication No. 441: Photometric and Colorimetric Methods of Measurement of the Light Emitted by Cathode-Ray Tube Screens

Keywords

colorimetric data, spectroradiometry, visual display units (VDUs), CIE tristimulus values, radiance, irradiance, display calibration, color measurement standard, brightness, LCD, CRT, display quality control, ASTM E1336