Near-to-eye display head movement threshold freezing
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Solution Overview
Problem
Conventional near-to-eye (NTE) display systems for pilots experience image lag and jerky motion when the pilot's head moves rapidly, making it difficult to interpret conformal images effectively, especially during aircraft maneuvers.
Innovation Solution
A method and system that utilize a near-to-eye display device with sensors to track the pilot's head movement, freezing or modifying the conformal video image when the movement exceeds a threshold, ensuring a smooth and stable display by maintaining the last rendered image until the head movement slows down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the conformal video image is continuously updated to reflect real-time head movement, then the image freshness is improved, but jerky or jittery motion occurs when the pilot's head moves rapidly
Solution Approach 1:
The system dynamically adjusts the image update behavior based on head movement conditions. When head movement is below a threshold, the conformal video image is updated in real-time to maintain freshness. When head movement exceeds the threshold, the system switches to freezing the last rendered image to prevent jerky motion, thus adapting the update mechanism to current operational conditions
Solution Approach 2:
The system continuously monitors head movement and uses this feedback to control image rendering. The head tracking system provides real-time feedback on pilot head position and velocity, which the rendering system uses to determine whether to update or freeze the conformal video image, creating a closed-loop control system that balances image freshness and stability
2Speed
If the conformal video image is updated in real-time during rapid head movement, then the image reflects current position, but the motion becomes jerky and difficult to interpret
Solution Approach 1:
The system dynamically changes the image update rate based on head movement speed. During rapid head movement, the system freezes the image to provide a stable, interpretable view. During normal movement, the system updates the image in real-time to maintain high update speed and reflect current position, thus adapting the update behavior to movement conditions
Solution Approach 2:
The system uses periodic evaluation of head movement thresholds to determine when to freeze or update the image. By continuously monitoring head movement and comparing it against thresholds, the system creates a rhythmic pattern of freezing and updating that maintains interpretability during rapid movement while preserving real-time updates during stable periods
Data Source
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AI summary
A near-to-eye (NTE) display allows an operator of an apparatus, such as a pilot of an aircraft, to see a conformal video presentation of the view outside the apparatus. Significant objects outside are converted into a conformal video view. An accelerator measures movement and rate of movement of the NTE display positioned on the operator's head, and if the movement and rate exceed a threshold, either ceases the continued display, removes, or deemphasizes the conformal image, for the period of the delay in order to eliminate any jerky or jittery motion of the displayed conformal image, which may be distracting, irritating, or headache inducing to the pilot.