Virtual Image Display Zoning for Vergence-Accommodation Conflict
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Solution Overview
Problem
Existing virtual image displays cause Vergence Accommodation Conflict (VAC) due to a single focal plane design, leading to user discomfort such as dizziness and nausea, as they fail to adapt focal planes for different object distances, conflicting the physiological reactions of vergence and accommodation.
Innovation Solution
A virtual image display system comprising a projection device divided into zones, generating and filtering image beams with different traveling directions, and an eye-resting device reflecting these beams to form images on a virtual aperture plane, adjusting incident angles based on position information to replicate complete light field information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single focal plane is used in virtual image display, then the vergence response is correct and distance sense is provided, but the accommodation function can only focus on one position causing Vergence Accommodation Conflict
Solution Approach 1:
The display is divided into multiple zones (first zone, second zone, third zone) with different focal planes. Each zone independently controls its focal plane position, allowing different parts of the display to focus at different distances. This segmentation resolves the contradiction by enabling multiple focal planes while maintaining correct vergence response for each zone.
Solution Approach 2:
The system dynamically adjusts the focal plane of each zone based on the displayed image content and user needs. The focal plane can be independently controlled for each zone, transforming a static single-focal-plane system into a dynamic multi-focal-plane system that adapts to different viewing conditions.
2Ease of operation
If binocular parallax is used to create three-dimensional sense, then vergence response is satisfied, but user comfort deteriorates due to Vergence Accommodation Conflict
Solution Approach 1:
By dividing the display into multiple zones with independent focal plane control, the system maintains binocular parallax for three-dimensional sense while eliminating the harmful VAC effect. Each zone can be focused at different planes, allowing users to comfortably view content at various distances without dizziness or nausea.
3Device complexity
If only one focal plane is implemented, then the system complexity is low, but the light field information is incomplete
Solution Approach 1:
The system segments the display into multiple zones, each capable of independent focal plane adjustment. This segmentation enables complete light field information to be reproduced by capturing and displaying light at multiple focal planes simultaneously, while the modular zone structure keeps the added complexity manageable.
Solution Approach 2:
The system adds the focal plane dimension to the traditional two-dimensional display, creating a three-dimensional light field representation. By controlling focal planes at different depths (first focal plane, second focal plane, third focal plane), the system reproduces complete light field information including depth cues.
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 VAC by allowing correct eyeball accommodation responses and providing accurate focal plane information, thereby reducing user discomfort.
Implementation Method 1
converge the image beams to generate a plurality of converged image beams respectively
Implementation Method 2
the eye-resting device is disposed between the projection device and a target region, and reflects the filtered image beams to form an image on a virtual aperture plane
Data Source
AI summary
Disclosed are a virtual image display system and a display method. The virtual image display system includes a projection device and an eye-resting device. The projection device is disposed to: provide a plurality of image beams corresponding to each zone; converge the image beams to generate a plurality of converged image beams respectively; and filter the corresponding converged image beams to generate a plurality of filtered image beams, wherein the filtered image beams have a plurality of different traveling directions corresponding to various zones. The eye-resting device reflects the filtered image beams to form an image on a virtual aperture plane corresponding to the target region.