Dual-Display Wearable Eye Calibration for Gaze Alignment
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Solution Overview
Problem
Existing wearable devices struggle with accurately tracking user gaze and correcting errors in augmented reality displays, leading to misalignment between displayed objects and focal points, which affects the user experience.
Innovation Solution
A wearable device equipped with dual displays and eye-tracking cameras identifies gaze errors by comparing display positions with focal positions, and corrects these errors by moving visual objects on the background screen based on identified gaze patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gaze tracking is implemented using image processing of eyes, then the device can determine user gaze and focus, but the accuracy of gaze tracking is insufficient leading to misalignment between displayed objects and focal positions
Solution Approach 1:
The system continuously monitors gaze position, compares it with the displayed object position, calculates deviation values, and adjusts the display position accordingly. This closed-loop feedback mechanism ensures that any misalignment is detected and corrected in real-time, resolving the contradiction between initial gaze tracking accuracy and final alignment reliability.
Solution Approach 2:
The system changes the display position parameter based on the calculated deviation values from gaze tracking. By dynamically adjusting the display position parameter according to the measured gaze position and calculated deviations, the system improves both measurement precision and alignment reliability simultaneously.
2Measurement precision
If multiple objects are displayed at different time points on a 3D screen, then the system can perform calibration, but the calibration process is complex and time-consuming
Solution Approach 1:
The system pre-calculates and stores deviation values for multiple objects at different time points before the actual calibration process. This preliminary preparation allows the calibration to proceed more efficiently by retrieving pre-computed data rather than calculating everything in real-time, thus reducing calibration time while maintaining precision.
Solution Approach 2:
The system uses a subset of pre-calculated deviation values and displays only the necessary number of objects required for accurate calibration. By selectively using partial data from the pre-computed set, the system achieves sufficient calibration precision without the time cost of processing all possible objects, thus optimizing the balance between precision and time.
3Measurement precision
If the system identifies and corrects gaze errors by moving visual objects, then alignment accuracy improves, but the device complexity increases
Solution Approach 1:
The display system serves multiple functions: it displays visual objects for calibration, tracks gaze position, calculates deviations, and executes correction movements. By making the display system multi-functional, the patent reduces the need for separate dedicated components for each function, thereby improving alignment accuracy without proportionally increasing device complexity.
Solution Approach 2:
The system automatically performs gaze tracking, deviation calculation, and object position adjustment without requiring external intervention. The system serves itself by using its own resources (display, camera, processor) to complete the calibration and correction process, reducing the need for additional external devices and simplifying the overall system architecture.
Data Source
AI summary
A method executed by a wearable device including a display system including a first display and a second display facing eyes of a user wearing the wearable device, and a plurality of cameras configured to obtain an image including the eyes, includes: displaying objects at different time points on a screen of the display system, based on the image, identifying gazes looking at the objects, identifying, based on the identified gazes, errors associated with the gazes, wherein the errors indicate differences between display positions of the objects and focal positions of the gazes, and wherein the focal positions have a one-to-one correspondence with the objects, displaying a visual object on a background screen on the display system to move the visual object through partial display positions of the display positions, which are selected based on the errors, and based on another gaze looking at the visual object, correcting the errors.