LRU Display Harmonization via Curve Fitting Calibration
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Solution Overview
Problem
Modern vehicles with multiple onboard displays face integration challenges due to performance variations across line replaceable units (LRUs) from different manufacturers, especially during night vision operations, as these units respond differently to common dimming commands, leading to inconsistent display outputs that can saturate night vision goggles and impair vehicle operation.
Innovation Solution
The method involves using curve fitting to determine calibration information for display drivers, which is stored and used to automatically adjust the display output to achieve harmonized characteristics across all components connected to a common dimming command bus, compensating for variations in lighting technologies and signal paths without requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different manufacturers provide LRUs with different display technologies and hardware, then device versatility and manufacturer independence are improved, but display output consistency and night vision compatibility deteriorate
Solution Approach 1:
The patent applies parameter changes by measuring the actual display output characteristics of each LRU and adjusting the dimming command parameters specifically for that unit. The system determines a transfer function that maps standard dimming commands to unit-specific adjusted commands, compensating for variations in display technologies and hardware across different manufacturers while maintaining night vision compatibility.
2Manufacturing precision
If manual calibration methods are used for each LRU, then display output consistency is improved, but time consumption and operational complexity increase
Solution Approach 1:
The system implements self-service calibration by automatically measuring the display output characteristics of each LRU and generating the appropriate transfer function without requiring manual intervention. The control module autonomously performs the calibration process, eliminating the need for operators to manually adjust each display unit while achieving consistent night vision-compatible output across all LRUs.
Solution Approach 2:
The patent employs feedback mechanisms by measuring the actual display output of each LRU and using this information to adjust the dimming commands. The system continuously monitors display characteristics and applies compensatory adjustments based on the measured performance, ensuring consistent output across different units without manual calibration.
3Ease of operation
If standard dimming commands are applied uniformly across all LRUs, then system simplicity and ease of operation are improved, but display output consistency and night vision compatibility deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the fleet of LRUs into individually calibrated units, each with its own transfer function stored in memory. Rather than treating all displays uniformly, the system segments the calibration process to account for unit-specific characteristics while maintaining a unified control architecture, thus preserving night vision compatibility without sacrificing system simplicity.
Data Source
AI summary
Methods, devices and systems are provided for harmonizing output display characteristics of one component with those of other components onboard a vehicle, such as an aircraft. A line-replaceable unit (LRU) suitable includes a display driver to be coupled to a display command bus, a data storage element to maintain calibration information for the display driver, and a control module coupled to the display driver and the data storage element to identify a current state of an input command signal from the display command bus, identify an adjustment for the display driver based on the calibration information using the current state of the input command signal, and automatically operate the display driver in accordance with the adjustment.