Mixed Reality Display IPD Alignment Mechanism
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Solution Overview
Problem
Users of head-mounted mixed reality displays and binoculars face difficulties in aligning the optical axes with their inter-pupillary distance (IPD), leading to issues such as eye strain and headaches, as existing methods require manual adjustment through trial and error, which can be time-consuming and inefficient.
Innovation Solution
A see-through, near-eye mixed reality display system with movable display optical systems and sensors that automatically adjust to align with the user's IPD, utilizing processors to determine adjustment values and apply them via a display adjustment mechanism to ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment through trial and error is used, then alignment with IPD can be achieved, but the process is time-consuming and inefficient
Solution Approach 1:
The system automatically detects the user's IPD using sensors and cameras, and self-adjusts the optical systems without requiring manual intervention. The processor analyzes sensor data to determine optimal positions, and the adjustment mechanism automatically moves the optical systems to achieve proper alignment, making the system serve itself rather than requiring user operation.
Solution Approach 2:
The system uses sensors and cameras to continuously monitor the user's eye positions and provides feedback to the processor. Based on this feedback, the system calculates adjustment values and automatically adjusts the optical systems. This closed-loop feedback mechanism ensures accurate alignment while eliminating the need for time-consuming manual trial and error adjustment.
2Productivity
If automatic adjustment is implemented, then adjustment time is reduced, but device complexity increases
Solution Approach 1:
The system integrates multiple functions into a single platform: sensors detect eye position, cameras capture images, processors analyze data and calculate IPD, and adjustment mechanisms move optical systems. This multi-functional integration achieves automatic adjustment while managing complexity through shared hardware and software resources across the entire system.
Solution Approach 2:
The system replaces manual mechanical adjustment with an automated control system. Instead of requiring users to manually move optical components, electronic sensors and processors detect eye position and automatically control the adjustment mechanisms, substituting mechanical manual operation with an automated electromechanical system that reduces overall complexity through integration.
3Ease of operation
If optical axes are not aligned with IPD, then device structure is simpler, but eye strain and headaches occur
Solution Approach 1:
The system transitions from a static optical system to a dynamic one that can automatically adjust. The optical systems are made movable with adjustable positions, allowing them to dynamically adapt to the user's specific IPD. This dynamic capability ensures proper alignment for comfort while managing complexity through automated control rather than complex mechanical structures.
Data Source
AI summary
The technology provides for adjusting a see-through, near-eye, mixed reality display device for alignment with an inter-pupillary distance (IPD) of a user by different examples of display adjustment mechanisms. The see-through, near-eye, mixed reality system includes for each eye a display optical system having an optical axis. Each display optical system is positioned to be seen through by a respective eye, and is supported on a respective movable support structure. A display adjustment mechanism attached to the display device also connects with each movable support structure for moving the structure. A determination is automatically made as to whether the display device is aligned with an IPD of a user. If not aligned, one or more adjustment values for a position of at least one of the display optical systems is automatically determined. The display adjustment mechanism moves the at least one display optical system in accordance with the adjustment values.