Adjustable XR Light Field Display for Vergence-Accommodation Conflict
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional XR devices suffer from vergence-accommodation conflict (VAC), causing discomfort, visual strain, and blurred perception due to a fixed focal distance that misaligns vergence and accommodation, particularly in augmented reality devices.
Innovation Solution
An XR device with adjustable display layers and image planes, utilizing mechanical or non-mechanical means to dynamically adjust a light field, incorporating eye tracking to enhance user comfort and visual experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single image plane at a predetermined distance is used in conventional XR devices, then the device structure is simple, but vergence-accommodation conflict occurs causing visual strain and blurred perception
Solution Approach 1:
The patent divides the display into multiple adjustable image planes (first image plane and second image plane) that can be independently positioned at different depths. This segmentation allows virtual content to be rendered at multiple focal distances simultaneously, enabling the display to match both near and far objects in the real world, thereby resolving vergence-accommodation conflict without excessive structural complexity
Solution Approach 2:
The patent implements dynamic adjustment of image plane positions through mechanical or non-mechanical means. The first and second image planes can be selectively moved to different depths based on the user's viewing requirements, allowing the display to adapt to varying focal distances in real-time. This dynamic capability eliminates visual strain by keeping virtual content in focus regardless of the user's accommodation state
2Ease of operation
If the image plane is fixed at a predetermined distance, then the device is easy to operate, but the appearance of virtual content conflicts with real objects at different depths
Solution Approach 1:
The patent employs dynamic adjustment mechanisms that automatically reposition image planes based on detected user gaze or content depth requirements. This automation maintains ease of operation while achieving precise visual alignment between virtual and real objects at different depths, resolving the contradiction between operational simplicity and visual consistency
3Object-affected harmful factors
If multiple adjustable display layers are implemented, then vergence-accommodation conflict is reduced, but device complexity increases
Solution Approach 1:
The patent segments the display system into distinct adjustable layers (first and second image planes) that can be independently controlled. This segmentation enables effective reduction of vergence-accommodation conflict by providing separate focal planes for different depth ranges, while the modular architecture helps manage structural complexity through organized, independent control of each layer
Data Source
AI summary
A head-wearable extended reality device includes a display arrangement mounted to a frame. The display arrangement includes a first display layer, a second display layer, and a light source that is arranged to illuminate the first display layer and the second display layer. At least one of the first display layer or the second display layer is selectively displaceable relative to the frame. One or more processors are provided to control the display arrangement such that the light source is deactivated during displacement of the first display layer or the second display layer relative to the frame.