AR Waveguide Depth Plane Switching for Eye Strain Reduction
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Solution Overview
Problem
Existing augmented reality (AR) technologies face challenges in providing a comfortable, natural-feeling presentation of virtual image elements amidst real-world imagery due to accommodation-vergence mismatches and eye strain, which can lead to discomfort and reduced long-term user engagement.
Innovation Solution
The use of a head-mountable display system with waveguides configured to project light onto specific depth planes, adjusting image content based on accommodation-vergence mismatch thresholds and user eye strain, and switching depth planes to maintain an acceptable accommodation-vergence mismatch within a tolerance level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If waveguides are used to project light onto specific depth planes, then depth perception and 3D viewing experience are improved, but accommodation-vergence mismatch increases causing eye strain
Solution Approach 1:
The system dynamically switches between multiple depth planes based on user fixation detection and accommodation-vergence mismatch monitoring. The display transitions from static depth presentation to dynamic adaptation, selecting optimal depth planes that minimize eye strain while maintaining depth perception benefits.
Solution Approach 2:
The system changes the optical parameters of the waveguides by switching between different depth planes with specific optical powers. Each depth plane is configured with predetermined optical power to control the accommodation-vergence mismatch, allowing the system to optimize visual comfort while maintaining depth perception.
2Ease of operation
If multiple depth planes are provided to enhance 3D experience, then viewing comfort is improved, but device complexity increases
Solution Approach 1:
The display system is segmented into multiple independent depth planes, each with its own waveguide and optical power configuration. This segmentation allows the complex function of providing multiple depth planes to be divided into manageable, pre-configured units that can be selectively activated.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor user fixation and detect accommodation-vergence mismatch. This feedback drives automated depth plane selection, reducing the operational complexity for users while maintaining optimal viewing comfort through adaptive control.
3Object-affected harmful factors
If depth planes are switched based on user fixation, then eye strain is reduced, but measurement precision requirements increase
Solution Approach 1:
The system performs preliminary configuration of multiple depth planes with predetermined optical powers and characteristics before operation. This preliminary setup allows the system to rely on pattern recognition and threshold-based detection during operation, reducing the real-time measurement precision requirements while still effectively reducing eye strain.
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
This approach enhances user comfort by reducing eye strain and maintaining a credible 3-dimensional viewing experience, allowing for longer-term use of AR systems with reduced waveguide stacks and improved immersion.
Implementation Method 1
one or more waveguides each having optical power and an associated depth plane
Implementation Method 2
The one or more waveguides are configured to project light to a viewer to display image content on the associated depth planes
Data Source
AI summary
Methods and systems are disclosed for presenting virtual objects on a limited number of depth planes using, e.g., an augmented reality display system. A farthest one of the depth planes is within a mismatch tolerance of optical infinity. The display system may switch the depth plane on which content is actively displayed so that the content is displayed on the depth plane on which a user is fixating. The impact of errors in fixation tracking is addressed using partially overlapping depth planes. A fixation depth is determined and the display system determines whether to adjust selection of a selected depth plane at which a virtual object is presented. The determination may be based on whether the fixation depth falls within a depth overlap region of adjacent depth planes. The display system may switch the active depth plane depending upon whether the fixation depth falls outside the overlap region.