AR Display IPD Calibration via Virtual Mark Alignment
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Solution Overview
Problem
Current augmented reality display systems face challenges in accurately calculating and adjusting interpupillary distance (IPD), leading to errors in stereo vision and grid distortion, particularly for users with varying IPD, as existing methods rely on external devices or relative optical quality adjustments without ensuring the most ideal position.
Innovation Solution
An augmented reality display device and method that calculates IPD by displaying virtual marks corresponding to real marks in space, determining deviations, and adjusting virtual images accordingly to provide correct left and right eye images, ensuring accurate IPD calculation and correct three-dimensional image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If IPD is detected by external device scanning face contour, then IPD measurement is achieved, but the process is passive and may have measurement precision issues
Solution Approach 1:
The system uses the user's own visual feedback to self-adjust the IPD setting. By displaying virtual marks that should align with real marks and having the user observe whether they align, the system transforms the passive external measurement into an active self-service adjustment where the user's visual system directly participates in the calibration process.
Solution Approach 2:
The system implements a feedback loop where virtual marks are displayed at calculated positions based on current IPD settings, the user observes the alignment between virtual and real marks, and this visual feedback is used to iteratively adjust the IPD setting until optimal alignment is achieved, thereby improving measurement precision.
2Ease of operation
If IPD is adjusted by hardware mechanism, then IPD adjustment is achieved, but the user only observes relative optical quality and cannot determine the most ideal position
Solution Approach 1:
The patent introduces virtual marks as an intermediary element between the hardware adjustment mechanism and the user's observation. These virtual marks serve as a reference that translates the abstract optical quality into concrete visual alignment cues, allowing the user to precisely determine when the IPD is optimally adjusted by observing whether virtual marks align with real marks.
Solution Approach 2:
The system uses visual appearance changes of virtual marks (their position, alignment status with real marks) to indicate the quality of IPD adjustment. When virtual marks align with real marks, it provides a clear visual signal that the IPD is correctly set, transforming the subjective optical quality assessment into an objective visual alignment check.
3Reliability
If IPD deviation exists, then stereo vision position error occurs, but the error is not detectable without precise measurement
Solution Approach 1:
The system creates a feedback mechanism where the consequence of IPD deviation (misalignment between virtual and real marks) is directly visible to the user. This visual feedback allows detection of stereo vision position errors and enables corrective adjustment of the IPD setting, thereby improving reliability without requiring complex measurement equipment.
Solution Approach 2:
The patent replaces complex mechanical measurement systems with a visual alignment system. Instead of using精密 mechanical devices to measure and detect IPD deviations, the system uses graphical user interface elements (virtual marks) that visually indicate alignment status, substituting mechanical measurement with optical-visual detection that is both precise and user-friendly.
Data Source
AI summary
An augmented reality display device including a virtual image display and a controller is provided. The virtual image display is configured to provide a left eye virtual image and a right eye virtual image to a left eye and a right eye of a user, respectively. The controller is electrically connected to the virtual image display, and is configured to command the virtual image display to display a left eye virtual mark and a right eye virtual mark, corresponding to a real mark in space, in the left eye virtual image and the right eye virtual image, respectively, and calculate an interpupillary distance between the left eye and the right eye according to a deviation of the left eye virtual mark with respect to the real mark and a deviation of the right eye virtual mark with respect to the real mark.