Binocular Display Calibration for Vertical Alignment Error
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Solution Overview
Problem
Extended reality systems, such as mixed or augmented reality systems, suffer from vertical alignment errors in binocular displays, leading to discomfort and double vision due to misalignment of visual stimuli in the left and right displays, which strain the eyes and hinder binocular fusion.
Innovation Solution
A method is employed to measure and correct vertical alignment errors by displaying a free-fusion state followed by a vertical alignment error measurement scene, allowing users to provide input adjustments to compensate for the misalignment, thereby determining calibration parameters to align the displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If binocular displays are used to provide immersive XR experience, then user immersion and visual experience are improved, but vertical alignment errors cause eye strain and discomfort
Solution Approach 1:
The system performs preliminary calibration by displaying alignment patterns and measuring the user's corrective adjustments before actual use. The calibration parameters are determined in advance to compensate for individual vertical alignment errors, ensuring that the binocular displays are properly aligned before the user begins using the XR system, thereby preventing eye strain and discomfort from misalignment
2Manufacturing precision
If display components are adjusted to correct vertical alignment errors, then binocular fusion accuracy is improved, but calibration process complexity increases
Solution Approach 1:
The system enables self-calibration by allowing the user to directly interact with the alignment patterns and provide corrective adjustments. The user themselves performs the calibration function by adjusting the displayed patterns until they appear aligned, and the system automatically captures these adjustments as calibration parameters. This eliminates the need for complex external calibration equipment or专业技术人员进行校准，reducing calibration process complexity while achieving accurate vertical alignment
Data Source
AI summary
A scene depicted using a binocular display device may be mis-calibrated in the vertical axis and generate vertical alignment error. A free-fusion state inducing scene may be first displayed that presents a user of the device with a contrasting scene that allows the user to recognize effects of vertical alignment error. Once accustomed to the free-fusion inducing scene, a vertical alignment error measurement scene may be displayed to the user to determine the vertical alignment error generated due to the miscalibration of the device. Based on the observed vertical alignment error, user input may be obtained to align the two patterns. A correction factor may be determined based on the user input and the device may be calibrated based on the correction factor.