Failsafe LED Control System for Aviation Displays
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Solution Overview
Problem
Aviation LED display systems require complex brightness control electronics to adjust to ambient light conditions, and existing systems risk data loss and reliability issues due to the complexity and potential failures in modulator and processor components, especially in critical cockpit environments.
Innovation Solution
A brightness control system with segregated LED panels, a power supply, a modulator, and a logic gate that generates a modulated voltage for secondary priority data, while a processor and logic gate ensure that first priority data switches to full default brightness in case of modulator or processor failure, using pulse width modulation and failsafe power logic to maintain high-priority data visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex brightness control electronics are used to adjust LED panels to ambient light conditions, then the display adaptability is improved, but the system reliability deteriorates due to potential failures in modulator and processor components
Solution Approach 1:
The display system is divided into two separate LED panels: a first LED panel for high-priority aviation data and a second LED panel for low-priority aviation data. The first panel uses simple unmodulated voltage control for high reliability, while the second panel uses complex modulated voltage control for adaptability. This segmentation allows the critical high-priority display to remain unaffected by failures in the complex brightness control electronics.
Solution Approach 2:
Different brightness control strategies are applied to different parts of the display system based on their priority requirements. The first LED panel (high-priority) receives unmodulated voltage for maximum reliability, while the second LED panel (low-priority) receives modulated voltage for ambient light adaptability. This local differentiation optimizes both reliability and adaptability where needed.
2Use of energy by moving object
If modulated voltage is used for brightness control of LED panels, then the energy efficiency is improved, but the risk of data loss increases due to potential modulator failures
Solution Approach 1:
The system segments the display functionality to protect critical information. The first LED panel displaying high-priority aviation data uses unmodulated voltage control, eliminating the risk of data loss from modulator failures. The second LED panel displaying low-priority data uses modulated voltage for energy efficiency, accepting the higher risk as tolerable for non-critical information.
Solution Approach 2:
The system prepares for potential modulator failures by having a fallback display path. The first LED panel with unmodulated voltage control serves as a backup that ensures high-priority data remains visible even if the modulator fails, providing beforehand cushioning against information loss.
3Device complexity
If a single LED panel is used for all aviation data, then the device complexity is reduced, but the ability to prioritize critical information deteriorates
Solution Approach 1:
The display system is segmented into two separate LED panels to enable data prioritization. The first panel displays high-priority aviation data with simple control, while the second panel displays low-priority data with complex brightness control. This segmentation provides the versatility to prioritize critical information while keeping the overall system design relatively simple.
Solution Approach 2:
Different control qualities are applied locally to different display panels based on data priority. The high-priority display panel receives simple, reliable unmodulated control, while the low-priority panel receives complex, adaptive modulated control. This local quality differentiation enables effective data prioritization without requiring complete system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures continued availability and maximum visibility of high-priority aviation data even in system failures, reducing complexity and cost by providing a robust backup control system that prevents data loss and maintains reliability.
Implementation Method 1
The modulator generates a modulated voltage for the second LED panel, which displays the second priority data at a modulated brightness level
Implementation Method 2
The logic gate switches the first LED panel from the modulated voltage to an unmodulated voltage based on the error signal
Data Source
Figure 1
Figure 2
AI summary
A display system (10) comprises first (12) and second (14) LED panels for displaying first and second priority aviation data, a power supply (31), a modulator (33), a processor (34) and a logic gate (38). The modulator generates a modulated voltage for the second LED panel (14), where the second priority data are displayed at a modulated brightness. The processor (34) controls the modulator (33), and generates a status signal indicating a failure condition of the modulated voltage. The logic gate (34) switches the first LED panel (12) from the modulated voltage to the unmodulated voltage based on the status signal, whereby the first priority data default from the modulated brightness level to full brightness based on the failure condition. As a matter of fact, this is a new part of the abstract. This is not the way it should work.