Near-Eye Display Optical Axis Adjustment for Close-Up AR Viewing
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Solution Overview
Problem
Existing augmented reality (AR) display devices struggle to maintain effective AR functionality when the observed object is in close-up view due to the vertical viewing angle of the human eye shifting and the reduced overlap between the camera and display modules' fields of view, causing a loss of AR effect.
Innovation Solution
A near-eye display device with a rotating module that adjusts the angle between the camera and display modules' optical axes, allowing seamless switching between distant and close-up views, ensuring optimal overlap and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical axes of the camera module and display module are fixed at an intersecting angle for distant view, then the AR display works well in distant view state, but the overlapping area between shooting range and display range becomes smaller in close-up view, causing loss of AR effect
Solution Approach 1:
The patent applies the dynamics principle by making the optical axis angle adjustable rather than fixed. The device switches between a first angle for distant views and a second angle for close-up views, allowing the system to adapt dynamically to different viewing conditions and maintain AR effectiveness across various distances
Solution Approach 2:
The patent implements parameter changes by modifying the optical axis angle parameter based on viewing distance. When switching from distant to close-up view, the system changes the angle between the camera module and display module optical axes, thereby optimizing the overlapping area between their respective fields of view for each viewing condition
2Reliability
If the camera module and display module are positioned for optimal distant view alignment, then distant view AR functionality is achieved, but the vertical viewing angle shift in close-up view causes the human eye focus to move away from the center of the real scene
Solution Approach 1:
The system changes the optical configuration parameter (angle between optical axes) based on viewing distance. For close-up views, adjusting this parameter ensures that the display range remains centered on the user's line of sight even when the vertical viewing angle shifts, thereby maintaining user comfort and proper focus alignment
3Manufacturing precision
If a certain distance exists between the camera module and display module to match distant view display, then the modules are properly aligned for distant views, but the overlapping area between shooting range and display range reduces in close-range view
Solution Approach 1:
The patent makes the relative angular positioning of the modules dynamic rather than static. By adjusting the angle between optical axes according to viewing distance, the system maintains optimal field of view overlap for both distant and close-up views while preserving the physical separation between modules
Solution Approach 2:
The patent achieves multi-functionality by enabling the same physical module configuration to serve multiple viewing purposes. Through angle adjustment, the system provides effective AR functionality for both distant and close-up views, making the device universally applicable to different viewing scenarios
Data Source
AI summary
A near-eye display device includes a camera module, a display module and a rotating module. The camera module is configured for obtaining an image information along a direction of a first optical axis. The display module is configured for transmitting an image light of virtual information to a human eye along a second optical axis. The rotating module is configured for controlling the rotation of the camera module to change a position of the first optical axis, so as to switch the near-eye display device between a state of close-up view and a state of distant view. In the state of distant view, an angle between the first optical axis and the second optical axis is 25°. In the state of close-up view, the angle between the first optical axis and the second optical axis is less than or equal to 13°.