Application Notes

Learn how our technology is applied to solve specific challenges.

Testing for Black Mura Gradient per German Automotive (DFF) Standards

Forum (DFF), the Black Mura Standard is a standard measurement method for evaluating uniformity in automotive displays. Radiant TrueTest™ Software offers several advantages for testing to the Black Mura standard, including API interface for synchronous control and testing of images on the display device, automated test sequencing for rapid display feature testing, ability to identify and grade various types of mura, electronically-controlled lens settings for Dynamic Filtering to defocus the lens for automatic moiré removal and provide quick re-focusing for other display tests, and gradient filtering for removal of broad gradient changes across the display to ensure this gradient is not a factor of Black Mura analysis.

In this technical note, you will learn:

  • Importance of DFF Black Mura Standard for evaluating uniformity of automotive displays
  • A method for using Radiant ProMetric Imaging Colorimeters and Photometers for Black Mura testing
  • Display and camera setup parameters and alignment accuracy checklist
  • Automated test sequence for rapid pass/fail analysis of displays based on luminance, contrast, and gradient
  • TrueTest Software advantages for Black Mura analysis

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Automated Visual Inspection and Correction (Demura) of OLED Displays

provides the high optical resolution necessary to measure OLED displays on the pixel and sub-pixel level. With TrueTest™ analysis software, these measurements can be used to correct individual display pixels. This process, referred to as “demura,” adjusts the luminance and/or chromaticity of each OLED pixel to produce displays with an entirely uniform appearance.

In this technical note, you will learn:

  • Methods for measuring luminance and chromaticity of all pixels in high-resolution OLED displays
  • System for quantifying the exact correction coefficients to address pixel-level non-uniformity
  • Demura method for adjusting pixel luminance values
  • Adaptable solutions for various OLED pentile structures, moiré patterns, and gamma inconsistency

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