BlackMura procedure consisting of: Alignment; Light uniformity; Dark uniformity; Dark gradient
LMK BlackMURA - Standardized uniformity measurement of displays
Standard-compliant evaluation of low-frequency brightness deviations in accordance with the DFF standard
Uniformity measurement according to standard
The visual uniformity of a display is one of the key quality factors. With LMK BlackMURA, TechnoTeam offers a well-established solution for standardized and full-surface analysis of low-frequency uniformity defects. The underlying standard was developed in close collaboration with the German Automotive OEM Group and the German Flat Panel Forum (DFF) (external link), and today serves as the recognized basis for evaluating visual uniformity.
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LMK BlackMURA Features at a Glance
- Full compliance with DFF BlackMURA
- Full-surface uniformity assessment of the display
- Adaptable for special cases such as DeepgrayMURA in OLEDs
- Compatible with image stitching and pillar-to-pillar displays
- Reproducible results thanks to standardized alignment
- Automation possible via SDK and the LMK Position robot platform
- Usable in confined spaces near production lines thanks to short-distance correction
- Projective distortion correction for angle-dependent analyses, e.g., for split-view displays
Simple 3-Step Procedure with Live View
The BlackMURA measurement is performed using a straightforward three-step process following an initial alignment:
- White image measurement to assess bright uniformity
- Black image measurement to detect dark non-uniformities
- Gradient analysis to evaluate local contrasts and brightness transitions
Thanks to the integrated live view mode of the LMK luminance measurement camera, camera alignment is fast and intuitive: position and angle can be checked and adjusted in real time. Flexible adaptations such as grayscale modifications (e.g., DeepgrayMURA for OLEDs) and full automation via SDK or the LMK Position platform ensure precise and reproducible results.
Thanks to the live view mode, alignment changes are recognized immediately.
Corrections for Compact Measurement Environments
The short-distance correction developed by TechnoTeam (external link to our technical article) enables BlackMURA-like evaluations even in confined spaces – ideal for compact production lines. At the same time, it can be combined with image stitching (external link to our technical article) for large-format displays (e.g., pillar-to-pillar), where multiple camera perspectives are precisely merged into one overall image through lateral movements.
RELEVANT PRODUCTS AND APPLICATIONS
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Publications
Short distance uniformity and BlackMURA measurements
Society for Information Display 2021
The increasing display sizes and changing form factors of displays, including automotive displays, lead to impractical measurement distances for lateral uniformity measurements. This contribution suggests and exemplarily applies two alternative and combinable methods to allow lateral uniformity measurements at low distances and describes an adjusted BlackMURA compliant validation procedure. The proposed methods are validated with a high-quality display device and are compared to results using the standard long-distance measurement procedure.
Distinguished Paper: Short Distance Uniformity and BlackMURA Measurements
Journal of the Society for Information Display
The increasing display sizes and changing form factors of displays, including automotive displays, lead to impractical measurement distances for lateral uniformity measurements. This contribution suggests and exemplarily applies two alternative and combinable methods to allow lateral uniformity measurements at low distances and describes an adjusted BlackMURA compliant validation procedure. The proposed methods are validated with a high-quality display device and are compared to results using the standard long-distance measurement procedure.
Repeatability and Reproducibility Considerations for BlackMURA Measurements
Proceedings of the International Display Workshops Volume 26 (IDW '19)
The “Uniformity measurement standard for Displays”, which is used for automotive applications, describes precise setup and alignment procedures to ensure reproducible measurement results. However, the influences of the tested device and the ILMD are not considered in detail. This contribution shows experiments and simulations to estimate these influences as well.
Conformity assessment with examples for BlackMURA measurements
Society for Information Display
To decide whether a display works according to the specification it is not only necessary to take the measurement values into account. The measurement uncertainty also plays a significant role in this decision. Besides some basic knowledge about the measurement uncertainty evaluation, the paper shows the main contributions and their influences for the key values of the BlackMURA standard. Using the rules of conformity assessment, the use of tolerance intervals and acceptance intervals is explained in detail to give all parties (OEMs, manufacturer of display and measurement system manufacturer) the chance to discuss their quality metrics in a reasonable manner.
Invited Paper: Recent Standardization Efforts and Measurement Procedures of German Automotive OEM and German Flat Panel Forum (DFF)
SID International Symposium 2016
The requirements of automotive displays differ to a large extent from consumer and industrial displays. In order to reduce the effort in specifying and evaluating high quality displays, German automotive OEMs, Tier 1/2 and the German Flat Panel Forum have launched a cooperation.
- Type:
- Add-On
- Applications:
- Automotive Display
- Measurands:
- Light measurement
- Tasks:
- Development & Industry