AR/VR HMD Imbalance Correction via Eye Tracking and Actuators
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Solution Overview
Problem
Conventional head-mounted displays for augmented and virtual reality struggle with vertical and rotational imbalances, leading to misaligned and out-of-focus images due to asymmetrical user anatomy and device positioning, resulting in reduced image quality and user discomfort.
Innovation Solution
The implementation of eye tracking sensors, inside-out tracking devices, and inertial measurement units to continuously monitor and adjust the display positions and orientations relative to the user's eyes, using mechanical actuators to align virtual objects with the ocular centers of each eye, ensuring proper alignment and focus through rendering schemes and mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional head-mounted displays are used without adjustment mechanisms, then device complexity is reduced, but image alignment precision and focus quality deteriorate due to vertical and rotational imbalances from asymmetrical user anatomy and device positioning
Solution Approach 1:
The patent implements dynamic adjustment mechanisms that allow the display device to change its position and orientation in real-time based on detected eye positions. The system uses actuators to dynamically reposition the display and adjusts the field of view parameters dynamically, transforming a static system into a dynamic one that adapts to user anatomy and maintains image alignment precision.
Solution Approach 2:
The system employs eye tracking sensors to automatically detect user eye positions and autonomously adjusts display positioning and orientation without requiring manual user intervention. The device self-calibrates by comparing detected eye positions with ideal positions and automatically commanding actuators to make necessary adjustments, enabling self-service alignment.
2Manufacturing precision
If mechanical actuators are added to adjust display position and orientation, then image quality and alignment are improved, but device weight and complexity increase
Solution Approach 1:
The patent applies adjustment mechanisms locally at the display level rather than requiring overall device restructuring. Individual actuators are positioned specifically to adjust display position and orientation, and eye tracking sensors are placed to monitor relevant eye positions. This localized approach minimizes the impact on overall device weight while achieving precise positioning control.
Solution Approach 2:
The system uses eye tracking sensors and control algorithms to replace manual mechanical adjustment mechanisms. Instead of requiring physical dials or switches for user adjustment, the system uses optical sensing to detect eye positions and electronically controls actuators, substituting manual mechanical operations with automated sensor-based control.
3Reliability
If eye tracking sensors and continuous monitoring systems are implemented, then image alignment and focus are maintained during use, but device complexity and power consumption increase
Solution Approach 1:
The system implements periodic calibration cycles rather than continuous operation at full capacity. The eye tracking sensors and adjustment mechanisms operate in periodic calibration modes where the system monitors eye positions and makes adjustments as needed, then enters lower-power states between calibration events. This periodic operation maintains alignment stability while reducing average power consumption compared to continuous full-power operation.
Data Source
AI summary
Systems and methods are disclosed for automatic adjustment for vertical and rotational imbalance in a head mounted display. A controller may determine a first eye position relative to a first display and a second eye position relative to a second display based on eye tracking information from the eye tracking sensors. The controller may render a virtual object to a first ideal image by moving the virtual object in a first vertical direction and rotating the virtual object in a first rotational direction based on the first eye position. The controller may render the virtual object to a second ideal image by moving the virtual object in a second vertical direction and rotating the virtual object in a second rotational direction based on the second eye position. The controller may display the first ideal image on the first display and the second ideal image on the second display.