AR Display Convergence Angle Adjustment for HMD
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Solution Overview
Problem
In transmission type display devices, augmented reality images deviate from the position of real objects due to mismatched focal lengths, reducing the affinity between real and virtual spaces, especially when the convergence angle is infinity, causing AR images to appear separated from real objects.
Innovation Solution
A display device with an object recognition section, distance detection section, and display control section that guides the user's visual line to match the convergence angle with the detected distance to the real object, allowing the AR image to be positioned correctly on the real object by adjusting the focal length through specific screen effects and image guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the convergence angle is set to infinity for viewing distant scenery, then the user can visually recognize real scenery clearly, but the focal length of the AR image becomes infinite causing the AR image to be recognized as separated from the real object
Solution Approach 1:
The patent implements dynamic adjustment of the display screen's convergence angle based on the detected distance to the real object. When the user views nearby objects, the system adjusts the convergence angle to match the object distance, ensuring the AR image focal length matches the real object position. This dynamic adaptation resolves the contradiction by making the convergence angle variable rather than fixed at infinity.
Solution Approach 2:
The system changes the convergence angle parameter according to the detected real object distance. By calculating the appropriate convergence angle based on distance measurements and adjusting the display screen accordingly, the patent ensures the AR image focal length matches the real object position, eliminating the separation effect while maintaining accurate visual recognition.
2Device complexity
If the AR image is displayed with infinite focal length to match the display screen, then the display configuration remains simple, but the AR image appears separated from nearby real objects reducing affinity between real and virtual spaces
Solution Approach 1:
Rather than maintaining a fixed simple configuration, the patent introduces dynamic adjustment of the convergence angle based on real object distance. This allows the system to adapt the AR image focal length to match nearby objects while keeping the adjustment mechanism integrated into the existing display control, minimizing added complexity while significantly improving spatial affinity.
Solution Approach 2:
The system uses distance detection feedback to automatically adjust the convergence angle. By continuously monitoring the distance to real objects and adjusting the display parameters accordingly, the patent maintains high spatial affinity without requiring complex manual configuration, as the system self-adjusts based on environmental feedback.
3Manufacturing precision
If the convergence angle is adjusted to match nearby real objects, then the AR image can be positioned accurately on the real object, but the user cannot simultaneously view distant scenery with the same convergence angle
Solution Approach 1:
The patent implements dynamic switching of convergence angles based on the detected distance to real objects. When nearby objects are detected, the system adjusts to a closer convergence angle for accurate AR image positioning. When distant scenery is the focus, the system returns to the infinity convergence angle, enabling the user to view distant scenery clearly. This dynamic adaptation resolves the contradiction by making the convergence angle context-dependent.
Solution Approach 2:
The system changes the convergence angle parameter according to the detected real object distance and viewing context. By calculating the appropriate convergence angle based on distance measurements and adjusting the display screen accordingly, the patent enables accurate AR image positioning for nearby objects while maintaining the ability to view distant scenery when needed.
Data Source
AI summary
A transmission type head mounted display which allows a user to visually recognize a display screen as a virtual image and to visually recognize the display screen at a focal length matching a convergence angle of the user, includes an image analysis portion that recognizes a real object within a view field of the user, a distance sensor that detects a distance from the user to the real object, a display control portion that displays the display screen in which an AR image for the real object is disposed, and a display section that displays the display screen, in which the display control portion displays a screen effect which guides a convergence angle of the user to a convergence angle matching the detected distance, on the display screen.