Optical Calibration Reference for Wear-Induced Display Misalignment
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Solution Overview
Problem
Head-mountable devices, such as VR, AR, and MR systems, experience misalignment of optical components like cameras and displays due to wear, shock, and environmental factors, leading to user discomfort and degraded image quality.
Innovation Solution
A calibration device interacts with the head-mountable device to provide a reference for aligning displays, allowing independent adjustment to ensure proper alignment with the external environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical components are fixed during manufacture, then manufacturing precision is achieved, but misalignment occurs during use due to wear and shock
Solution Approach 1:
The calibration device performs preliminary alignment adjustment before the device is put into use. The system captures images of calibration patterns and computationally determines misalignment, allowing corrections to be made in advance before normal operation begins, preventing the reliability degradation that would occur during actual use.
Solution Approach 2:
The system performs self-calibration by automatically capturing images of calibration patterns, processing the images to determine misalignment, and generating correction parameters without requiring external intervention. This self-service calibration process maintains alignment stability throughout the device lifecycle.
2Ease of operation
If calibration is performed manually, then alignment can be adjusted, but user comfort is degraded due to complexity of the process
Solution Approach 1:
The system replaces manual mechanical adjustment with an automated computational process. Images of calibration patterns are captured and processed algorithmically to determine precise misalignment measurements, which then drive automatic correction parameter generation. This substitution of mechanical manual adjustment with computational automation achieves both ease of operation and high measurement precision.
Solution Approach 2:
The system uses visual copies (images) of calibration patterns displayed on the device's own display to perform calibration. By capturing and analyzing these visual copies, the system can precisely measure alignment without requiring complex physical measurement tools or manual procedures, making the process simple for the user while maintaining high accuracy.
3Productivity
If calibration data is stored locally, then processing speed is improved, but adaptability to different users is reduced
Solution Approach 1:
The calibration system is designed to be universal by storing calibration data in the cloud where it can serve multiple users. The system can retrieve and apply different calibration parameters for different users based on their specific needs and characteristics, making the same hardware system adaptable to various users while maintaining efficient processing through pre-computed calibration data.
Data Source
AI summary
A wearable electronic device can include displays and/or cameras that can be calibrated for accurate recording and visual output. Whereas some aspects of a wearable electronic device can be calibrated at the time of production, usage and wear of the wearable electronic device can result in certain components becoming misaligned. A calibration device can provide an output that serves as a reference for each of a pair of displays of the wearable electronic device. Each of the displays can be independently adjusted so their corresponding outputs are properly aligned with the view of the external environment.