Variable Focus Stereoscopic Display Aligning Vergence and Accommodation
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Solution Overview
Problem
Conventional stereoscopic 3D displays cause viewer fatigue due to vergence-accommodation disparity, leading to discomfort and reduced effectiveness in applications requiring extended concentration and critical information interpretation.
Innovation Solution
A variable focus stereoscopic display system that adjusts the focus plane based on the vergence of the eyes using dynamic or passive lenses, correlating changes in focus distance with convergence distance to align depth cues, thereby reducing visual fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stereoscopic displays are used to provide enhanced 3D visual information, then depth perception and information interpretation are improved, but viewer fatigue and discomfort increase due to vergence-accommodation disparity
Solution Approach 1:
The patent applies dynamics by making the focus plane distance adjustable rather than fixed. The system dynamically changes the focus plane position based on the perceived depth of different elements in the stereoscopic display, allowing the accommodation cue to match the vergence cue for objects at various depths. This dynamic adjustment resolves the contradiction by enabling accurate 3D information interpretation while preventing viewer fatigue through consistent depth cue alignment.
Solution Approach 2:
The patent changes the parameter of focus plane distance from a fixed value to a variable value that corresponds to the perceived depth of displayed objects. By adjusting the focus plane distance parameter to match the depth information presented in the stereoscopic display, the system eliminates the mismatch between vergence and accommodation cues, thereby reducing viewer fatigue while maintaining accurate depth perception.
2Device complexity
If fixed focus plane is used in stereoscopic displays, then display simplicity is maintained, but depth cue consistency and viewer comfort deteriorate
Solution Approach 1:
The system transitions from a static fixed focus plane to a dynamic adjustable focus plane that automatically adapts to the depth information in the stereoscopic display. This dynamic capability improves viewer comfort by maintaining consistent depth cues while adding only moderate complexity through automated focus plane adjustment based on depth perception algorithms.
3Reliability
If vergence cues are manipulated to create 3D sensation, then stereoscopic depth perception is achieved, but accommodation focus remains fixed causing visual strain
Solution Approach 1:
The patent implements feedback by continuously monitoring or inferring the perceived depth of objects in the stereoscopic display and using this information to adjust the focus plane position accordingly. This feedback loop ensures that the accommodation cue remains consistent with the vergence cue, eliminating visual strain while maintaining accurate depth perception through synchronized depth cue manipulation.
Solution Approach 2:
The system changes the focus plane distance parameter dynamically to match the depth information being presented through vergence cues. By coordinating the adjustment of focus plane position with the manipulation of vergence cues, the system achieves consistent depth perception without generating visual strain, resolving the contradiction between depth accuracy and visual comfort.
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
The system enhances user comfort and usability by aligning focus and convergence cues, reducing eye strain and improving interpretation of stereoscopic information over extended periods, particularly in critical applications like avionics and medical fields.
Implementation Method 1
a first lens configured to be positioned between a first eye and a stereoscopic display, and a second lens configured to be positioned between a second eye and the stereoscopic display, wherein the first and second lenses are configured to modify the distance of the focus plane from the first and second eyes
Data Source
AI summary
A variable focus stereoscopic display system includes first and second lenses positioned between a viewer's eyes and a stereoscopic display that alters the distance to the focus plane of the viewer based on the vergence of the viewer's eyes while viewing the stereoscopic display.