Light Field Display Modulating Transparency for Vergence-Accommodation Conflict
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Solution Overview
Problem
Current VR display technologies fail to address the vergence-accommodation conflict, leading to visual discomfort, eye fatigue, and headaches due to the inability to simulate the correct focal distance for virtual objects, which are displayed on a flat surface.
Innovation Solution
A display system that includes a spatial light modulator and a processor to adjust light intensity and transparency based on acquired view information from multiple viewpoints, using a weighted rank-1 residue iteration method for matrix factorization to provide a more natural visual experience without complex computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If virtual objects are displayed on a flat display screen, then device complexity is reduced and ease of manufacture is improved, but vergence-accommodation conflict occurs causing visual discomfort and eye fatigue
Solution Approach 1:
The patent introduces a light field display system as an intermediary between the flat display screen and the user's eyes. This system uses multiple micro-lenses and light guides to manipulate light paths, creating virtual images at different depths without requiring the display screen itself to be physically three-dimensional. The light field display mediates the conflict by preserving the simplicity of flat screens while adding optical complexity only where needed to generate depth cues.
Solution Approach 2:
The patent changes the optical parameters of light propagation by using micro-lens arrays to control the direction and focus of light rays. By varying the focal lengths and orientations of micro-lenses across the display, the system creates different vergence cues for different regions of the screen, enabling accommodation at multiple depths while maintaining a flat physical display surface.
2Object-affected harmful factors
If light field display technology is used to address vergence-accommodation conflict, then visual comfort is improved, but device complexity increases and mobility is reduced
Solution Approach 1:
The patent segments the light field display into multiple independent micro-lens units arranged in a grid pattern. Each micro-lens can be controlled independently to manipulate light from specific regions of the display, allowing for localized depth effects without requiring the entire display system to be complex. This modular segmentation reduces overall system complexity while maintaining visual comfort benefits.
Solution Approach 2:
The patent designs the light field display system to perform multiple functions: it can display traditional 2D images, create 3D depth effects, and provide variable focal points all through the same hardware configuration. The micro-lens array and light guide structure serve universal purposes of light manipulation regardless of the specific content being displayed, reducing the need for separate systems for different display modes.
3Object-affected harmful factors
If known light field display apparatus are used, then vergence-accommodation conflict is addressed, but mobility is lost and head-mountability is not achieved
Solution Approach 1:
The patent nests the light field display components within a compact head-mounted structure. The micro-lens arrays, light guides, and display elements are arranged in nested configurations where smaller components are integrated within larger structural elements. This nesting allows the complex light field optics to be contained within a portable form factor that can be mounted on the user's head without excessive bulk or weight.
Solution Approach 2:
The patent transitions the light field display from a table-top or wall-mounted configuration to a head-mounted configuration by adding the dimension of portability. This involves redesigning the optical path to work with the constrained space and viewing geometry of head-mounted wearables, using folded optical paths and compact lens arrangements that maintain light field functionality while adapting to the new dimensional constraints of mobile use.
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 effectively reduces the vergence-accommodation conflict, providing a high-quality 3D image experience that minimizes eye strain and enhances immersion in virtual reality environments.
Implementation Method 1
a spatial light modulator configured to modulate input light based on a transparency value
Implementation Method 2
a display configured to emit light
Data Source
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.