Typical integration of LMK Position
Each luminance or color-based display measurement consists of two important parts:
- The alignment of the setup before the actual measurement.
- The measurement, including the operation of the calibrated measuring and test devices, and evaluation algorithms.
Especially the first part can take a lot of time during daily laboratory work and is often a major source of error, limiting the use of advanced measurement concepts.
The LMK Position is a photometric robotic system combining LMK-based machine vision with the high precision and flexible movements of a 6-axis Denso VS industrial robot and, optionally, a JETI specbos spectroradiometer. It allows effective and cost-efficient accompanying measurements during research and development tasks and rapid small-series product testing of all kinds of display systems.
Lade Player...
The LMK Position is designed as a fast and highly flexible precision alignment tool for display metrology tasks. The specially developed alignment functions rely on our established image processing and camera calibration techniques and well-known concepts such as parallax or ray tracing. LMK Position alignment functions can either be used via a dedicated GUIs alongside our LabSoft or combined with classic LMK automation as an SDK for developing and integrating your own measurement and alignment procedures.
Integration and safety
Each LMK Position system will be integrated by TechnoTeam directly at your site to ensure that all relevant safety standards are met*. Please refer to our Integration and Safety Details document below for more information. To learn more about the general concepts of photometric robotics, please have a look at our related publication or ask us for a live demonstration of the LMK Position at our local* facility.
* Integrations (demonstrations) are currently available in the following regions: European Union (Ilmenau, Germany,), South Korea, China (Shanghai).
Top ten reasons for LMK Position
- 1. Automated perpendicular/DFF-BlackMURA alignment within a few seconds
- 2. Automated precise goniometric scans
- 3. Automated Conoscopic alignment on any freeform-curved display using the 3D scan, including pixel structure avoidance method
- 4. Full 6-axis range of motion using secure cable routing
- 5. Storage of multiple camera alignment positions for high reproducibility and comparability
Reasons one to five: Simple fast and reproducible alignments
- 6. No more effort in complex, unique and non-reusable mechanical mointigs and fixtures for each prototype
- 7. Higher resolution using image stitching or image fusion (depending on the lens)
- 8. Automated focus, defocus, sparkle-scan, and (virtual) image distance measurement also for all your manual or fixed focus lenses
- 9. Use all alignment features also with the specbos 1211 spectroradiometer
- 10. Individual use of all components when dissambling the system
Reasons six to ten: Cost efficient and future proof metrology improvements
| Technical data | |
|---|---|
| Maximum arm reach | 875 mm |
| Number of axis | 6 |
| Position detection and motors | Absolute encoder; AC servomotors and brakes for all joints |
| Motion range | J1: +/-170°; J2: +135° -100°; J3: +153° -136°; J4: +/-270°; J5: +/- 120°; J6: +/-360° |
| Position repretability (at the center of the camera mounting) | +/-0.03 mm |
| Weight with Alu profile rack (incl. robot, LMK, controller, cables) | <150 kg |
| Alu profile rack dimensions (L × W × H) | 780 × 780 × 950 mm (Robot installation height: 970 mm) |
| Compatible cameras | LMK5, LMK6-5, LMK6-12, LMK6-30 |
| Installation environment of robot | Temperature: 0 to 40°C; Humidity: 20 to 90% RH; Vibration:4.9 m/s² (0.5 G) |
| Optional equipment | 7th axis (linear) mounted below the robot (below J1) Specbos 1211-LAN VIS-NIR spectroradiometer, Industrial operation PC (19'' rack) |
Publications
Advanced Alignment and Metrology Concepts Using Photometric Robotics with Examples for Automotive Displays
International Conference on Display Technology (ICDT 2021)
The alignment quality and reproducibility in ILMD (Imaging Luminance Measurement Device) based display metrology has a great influence on the reproducibility of the obtained measurement data. In this context, this contribution outlines and introduces several advanced measurement and alignment concepts that can be performed with “photometric robotics”. The term describes machine vision performed with an ILMD supported by robotic movements.
Precise Virtual Image Distance Measurements Using Imaging Luminance Measurement Devices with Type II Calibration
SID Vehicle Displays & Interfaces 2022
As head-up displays play an increasingly important role in modern vehicle cockpits, there is a growing demand for measurement procedures to characterize them. There are two general approaches to measuring virtual image distance, a parallax-based triangulation method and a focus-based technique. They can be performed using Imaging Luminance Measurement Devices with type II calibration, making them suitable for photometrical and geometrical measurements. This paper examines the advantages and drawbacks of both methods using mathematical models and measurement data.
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.
Photometric Robotics for Fast and Precise Human-Centered Automotive Display Metrology
SID Vehicle Displays & Interfaces 2021
The increasing complexity of automotive displays in terms of design, shape, and degree of integration leads to an increasing complexity of setup and alignment procedures. In this context, the effort required to ensure reproducible measurement results, e.g. for prototypes or in research and development is also increasing rapidly. We introduce the concept of photometric robotics which combines machine vision, photometry, and robotic to solve these challenges.
- Type:
- Package
- Applications:
- Automotive Display
- Measurands:
- Color measurement Light measurement
- Tasks:
- Automation & Industry Development & Industry Science & Research