VR Display Light Field Factorization for Vergence-Accommodation Conflict
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Solution Overview
Problem
Current VR displays fail to address the vergence-accommodation conflict, causing visual discomfort and eye fatigue due to their inability to support eye focal distance changes when viewing virtual objects, and existing solutions are either costly or non-portable.
Innovation Solution
A head-mountable display system that includes a spatial light modulator and a processor to adjust light intensity and transparency based on view information from multiple viewpoints, using weighted rank-1 residue iteration for efficient light field factorization, allowing for high-quality 3D image rendering without the need for complex computations or expensive eye tracking units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light field display technology is used to address vergence-accommodation conflict, then visual comfort is improved, but device complexity and cost increase due to requirements for time-division multi-image display or eye tracking units
Solution Approach 1:
The patent extracts and eliminates the need for complex eye tracking units and time-division multi-image display systems by using a different technical approach. Instead of relying on these complex components, the invention uses a simplified display system with a display unit and spatial light modulator that directly addresses vergence-accommodation conflict through light field factorization, thereby reducing device complexity while maintaining visual comfort benefits
Solution Approach 2:
The patent replaces expensive, complex eye tracking units and time-division multi-image display systems with a more economical solution based on light field factorization and spatial light modulation. This substitution uses simpler, more cost-effective components while achieving the same functional goal of addressing vergence-accommodation conflict
2Object-affected harmful factors
If light field display technology is used to support eye focal distance changes, then accommodation cues are improved, but portability deteriorates due to the size and weight of required components
Solution Approach 1:
The patent removes the need for heavy, bulky components typically required for light field displays by using a simplified architecture. The invention extracts the essential functionality needed to provide accommodation cues and eliminates unnecessary weight through the use of a compact display unit combined with a spatial light modulator, enabling portability while maintaining eye fatigue reduction benefits
Solution Approach 2:
The patent employs spatial light modulators which can be implemented as thin, lightweight components. These modulators can be integrated into head-mounted display form factors, providing the necessary light field manipulation for accommodation cues without adding significant weight or bulk to the portable device
3Manufacturing precision
If non-negative matrix factorization is used for light field factorization, then image quality is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent applies a simplified factorization approach that computes only the essential components needed for light field reconstruction rather than performing complete non-negative matrix factorization. This partial computation strategy maintains sufficient image quality for VR applications while dramatically reducing computational complexity and processing time, enabling real-time rendering
4Manufacturing precision
If high resolution initial image is displayed, then image quality is improved, but device complexity increases due to requirements for expensive display components
Solution Approach 1:
The patent replaces complex, expensive high-resolution display components with a simpler system that uses a display unit combined with a spatial light modulator. By substituting the mechanical/optical complexity of traditional high-resolution VR displays with light field factorization and spatial modulation, the invention achieves high perceived image quality through computational methods rather than requiring expensive hardware
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
Enables an immersive VR experience with reduced eye strain and improved visual comfort, suitable for various applications like 3D modeling and entertainment, while being cost-effective and portable.
Implementation Method 1
a spatial light modulator configured to modulate input light based on a transparency value
Data Source
Figure 1~3a
Figure 3b~5
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AI summary
A system and a method for displaying a scene are provided. The system includes a display configured to emit light, a spatial light modulator configured to modulate input light based on a transparency value, and at least one processor configured to acquire adjustment information including transparency of the spatial light modulator and light intensity information of the display from a plurality of pieces of view information corresponding to the scene and adjust an intensity value of the light emitted from the display and the transparency value of the spatial light modulator based on the adjustment information, wherein the plurality of pieces of view information are optical information of the scene, the optical information having been acquired at a plurality of viewpoints.