Dynamic Vergence Correction for Binocular Displays
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Solution Overview
Problem
Binocular displays, such as helmet-mounted displays, with fixed vergence distances cause eye strain in applications involving curved surfaces like aircraft canopies and flight simulators, as they fail to adjust to varying apparent viewing distances, leading to diplopia and visual discomfort.
Innovation Solution
A binocular display system with a display tracking system and a processor-controlled controller that dynamically corrects vergence based on the position and angular orientation of the display relative to the target object, using a look-up table and optical power considerations, to adjust the image warping over the entire field of view, only correcting errors greater than a threshold of 2 mrad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a binocular display uses a fixed vergence distance, then the device structure is simple and easy to manufacture, but it causes eye strain and diplopia when viewing objects at varying distances
Solution Approach 1:
The patent implements dynamic vergence adjustment by tracking the user's head position and orientation, then recalculating and applying vergence corrections in real-time based on the apparent viewing distance to target objects. This transforms the static fixed vergence system into a dynamic adaptive system that continuously adjusts to maintain comfortable binocular fusion across varying viewing conditions
Solution Approach 2:
The system changes the vergence parameter dynamically based on tracked head pose and calculated apparent viewing distance. By modifying the vergence angle according to the user's actual viewing geometry, the system adapts the display parameters to eliminate eye strain and diplopia while maintaining a relatively simple overall device structure
2Device complexity
If a binocular display uses a fixed vergence distance, then the device complexity is low, but it fails to accommodate varying apparent viewing distances in curved surface applications
Solution Approach 1:
The patent implements dynamic vergence adjustment by tracking the user's head position and orientation, then recalculating and applying vergence corrections in real-time based on the apparent viewing distance to target objects. This transforms the static fixed vergence system into a dynamic adaptive system that continuously adjusts to maintain comfortable binocular fusion across varying viewing conditions
Solution Approach 2:
The system employs a feedback loop where head tracking data provides continuous information about user position and orientation, which is processed to calculate the apparent viewing distance, and this information feeds back to adjust the vergence correction parameters. This closed-loop feedback mechanism enables the system to adapt to varying viewing conditions without requiring complex mechanical adjustments
3Object-affected harmful factors
If dynamic vergence correction is implemented, then eye strain is reduced and single vision perception is maintained, but the device complexity increases due to tracking systems and real-time processing
Solution Approach 1:
The patent replaces potential mechanical vergence adjustment mechanisms with an electronic/computational approach. Instead of physically moving optical components to adjust vergence, the system uses head tracking data and computational algorithms to calculate and apply vergence corrections through image processing and display control, significantly reducing mechanical complexity while maintaining the benefit of dynamic adaptation
Solution Approach 2:
The system creates a computational model of the user's viewing geometry by tracking head pose and calculating apparent viewing distances. This virtual model allows the system to determine appropriate vergence corrections without requiring complex physical measurements or adjustments, simplifying the overall device architecture while achieving the desired visual comfort
Data Source
AI summary
A binocular display vergence correction system is described. The binocular display vergence correction system includes a binocular display, a display tracking system, and a controller. The binocular display, being pixelated, includes a left eye image display and a right eye image display. The display tracking system is configured to determine the position and angular orientation of the binocular display relative to an origin position and origin angular orientation. The controller, includes a processor, and is configured to correct the vergence of the binocular display based on an apparent viewing distance from an eye position of the binocular display to a target object to be viewed on a screen based on the determined position and angular orientation of the binocular display. A method of correcting vergence for a pixelated binocular display is also described.