Adjustable Virtual Image Plane for 3D Display Vergence-Accommodation Conflict
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Solution Overview
Problem
Current three-dimensional image display technologies face challenges in avoiding visual fatigue due to vergence-accommodation conflict, which occurs when the depth of virtual objects is not accurately represented, leading to inconsistencies in how images are perceived by the observer's eyes.
Innovation Solution
A three-dimensional image display device and method that adjust the location of a virtual image plane based on depth information within the image data, using a processor to generate corrected image data and control an image forming optical system, including a display element and a drive unit, to maintain a consistent apparent size of virtual images across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stereoscopy technology is used to display three-dimensional images, then depth perception is improved, but visual fatigue occurs due to vergence-accommodation conflict
Solution Approach 1:
The patent applies dynamics by making the display element moveable along the optical axis. The drive unit adjusts the position of the display element based on depth information of virtual objects, allowing the system to dynamically adapt the image plane location to match different depth requirements, thereby resolving the vergence-accommodation conflict that causes visual fatigue
Solution Approach 2:
The patent changes the physical parameter of the display element position along the optical axis. By adjusting the distance between the display element and the observer based on depth information, the system modifies the image plane location to create accurate depth perception without causing visual fatigue from vergence-accommodation conflict
2Measurement precision
If the virtual image plane location is adjusted according to depth information, then depth perception is enhanced, but image distortion may occur
Solution Approach 1:
The processor generates corrected image data before display by predicting and compensating for potential image distortion. The correction unit processes the image data in advance based on the adjusted virtual image plane location, ensuring that the displayed image maintains proper proportions and prevents distortion from occurring
Solution Approach 2:
The system employs feedback by continuously monitoring the virtual image plane location and adjusting the image data correction accordingly. The correction unit uses depth information and plane location data to dynamically correct image distortion, ensuring accurate depth perception without shape degradation
3Ease of operation
If the display element position is adjusted to maintain consistent apparent size, then visual comfort is improved, but device complexity increases
Solution Approach 1:
The patent introduces a drive unit as an intermediary component between the processor and the display element. This intermediary automatically adjusts the display element position based on processed depth information, maintaining consistent apparent size and visual comfort while isolating the complexity from the user experience
Solution Approach 2:
The system implements self-service through automatic adjustment mechanisms. The drive unit autonomously positions the display element based on depth information without requiring manual intervention, and the correction unit automatically compensates for image distortion, reducing operational complexity while maintaining visual comfort
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 solution effectively reduces image distortion and maintains a consistent apparent size of virtual images, enhancing the depth perception and reducing visual fatigue by accurately adjusting the virtual image plane according to depth information, thereby improving the overall display quality.
Implementation Method 1
an image forming optical system including a display element configured to modulate light to form a display image according to the second image data
Implementation Method 2
a light transfer unit that forms the virtual image on the virtual image plane, the virtual image corresponding to the display image formed by the display element, the light transfer unit including a focusing member
Data Source
AI summary
An image display device includes a processor that sets a location of a virtual image plane on which a virtual image is formed according to depth information included in first image data and generates second image data obtained by correcting the first image data based on the set location of the virtual image plane; an image forming optical system including a display element configured to modulate light to form a display image according to the second image data and a light transfer unit that forms the virtual image on the virtual image plane, the virtual image corresponding to the display image formed by the display element, the light transfer unit comprising a focusing member; and a drive unit that drives the image forming optical system to adjust the location of the virtual image plane.