Vehicle AR Display Virtual Image Planes for Vergence Alignment
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Solution Overview
Problem
Current augmented reality display technologies fail to effectively superimpose images and real environment scenes, resulting in blurred images or scenes, leading to user discomfort due to misalignment of vergence and accommodation planes of the user's eyes.
Innovation Solution
The method involves adjusting the position of the vergence planes of a user's eyes when viewing augmented reality images and environmental scenes by projecting images onto different virtual image planes, ensuring that the distances between these planes and the user fall within specific ranges to maintain clear viewing and reduce discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If images are projected onto a single fixed position on the glass, then the display structure is simple, but the user experiences vergence-accommodation conflict causing blurred images and discomfort
Solution Approach 1:
The patent implements multiple virtual image planes at different positions along the optical path, allowing the system to dynamically adjust which plane displays which image based on distance requirements. This dynamic arrangement resolves the vergence-accommodation conflict by matching image distance with vergence distance, while maintaining overall structural simplicity through shared optical components.
Solution Approach 2:
The patent extends the display from a single two-dimensional plane to multiple virtual planes positioned at different depths along the optical axis (third dimension). This dimensional extension allows images to be displayed at various distances from the user, enabling proper vergence-accommodation pairing without complicating the lateral display structure.
2Device complexity
If multiple images are displayed at the same position on the glass, then the display structure remains simple, but the images and real environment cannot be effectively superimposed
Solution Approach 1:
The system dynamically assigns different virtual image planes to different images based on their required display distances. By adjusting which plane displays which image, the system achieves precise alignment between virtual images and real environmental features at various depths, maintaining structural simplicity while improving alignment precision.
3Manufacturing precision
If images are displayed at different positions on the glass, then image-environment superposition is improved, but the display system becomes more complex
Solution Approach 1:
The patent segments the single display plane into multiple virtual image planes positioned at different depths. Each plane can be independently controlled to display images at appropriate distances, achieving precise image-environment superposition. This segmentation is implemented through optical elements rather than physically separate display devices, maintaining system compactness.
Solution Approach 2:
The patent introduces optical elements (such as waveguides or holographic optical elements) as intermediaries between the display source and the user's eyes. These intermediaries create multiple virtual image planes without requiring multiple physical display devices, thus achieving precise depth control while keeping the overall system relatively simple.
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
This approach allows users to clearly view augmented reality images and environmental scenes simultaneously, reducing user discomfort caused by vergence-accommodation conflicts and improving the overall display method's effectiveness.
Implementation Method 1
Providing a first image by the display onto a glass of the vehicle at a first position, and a first virtual image is formed outside the glass when a user views the first image
Data Source
AI summary
A display method of a display disposed in a vehicle includes following steps. Providing a first image by the display onto a glass of the vehicle at a first position, and a first virtual image is formed outside the glass when a user views the first image. Providing a second image by the display onto the glass at a second position, a second virtual image is formed outside the glass when the user views the second image, the first virtual image, the second virtual image and an environmental scene are located within a field of view of the user, and the first position is different from the second position.