Movable Lenses in HMDs for Eye-Tracking
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Solution Overview
Problem
Current optical correction systems in head-mounted displays (HMDs) use static lenses, limiting the viewing angle for users and not accommodating eye movement.
Innovation Solution
An optical device with moveable lenses, utilizing a pupil-tracking module with sensors and actuators to track and adjust the lenses' position and orientation in real-time, matching the user's eye movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static lenses are used in HMDs, then the device structure is simple, but the viewing angle is limited
Solution Approach 1:
The patent applies the dynamics principle by transforming static lenses into moveable lenses that can dynamically adjust their position and orientation. The lens assembly is coupled to actuators that enable real-time movement in response to tracked eye movements, allowing the viewing angle to expand while maintaining manageable device complexity through controlled mechanical motion.
Solution Approach 2:
The patent implements feedback by using eye-tracking sensors to monitor user eye movements and automatically adjusting the lens position and orientation accordingly. This closed-loop feedback system ensures the lenses remain optimally positioned to maximize the viewing angle without requiring manual intervention, resolving the contradiction between structural simplicity and viewing angle expansion.
2Ease of manufacture
If static lenses are used in HMDs, then the manufacturing process is simple, but the system cannot accommodate eye movement
Solution Approach 1:
The patent applies dynamics by enabling the lens assembly to move dynamically in response to eye movements. The lenses are coupled to actuators that translate tracked eye movement data into corresponding lens position and orientation adjustments, allowing the system to adapt to natural eye movements while maintaining a manufacturable design through standardized mechanical components.
Solution Approach 2:
The patent replaces complex mechanical linkage systems with a more streamlined approach where actuators directly control lens position based on electronic eye-tracking signals. This substitution reduces manufacturing complexity while achieving the desired adaptability to eye movements through electromechanical control rather than pure mechanical design.
3Area of moving object
If moveable lenses with actuators are implemented, then the viewing angle is expanded, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by implementing moveable lenses that can adjust their position and orientation dynamically. The lens assembly is coupled to actuators that enable real-time movement in response to tracked eye movements, allowing the viewing angle to expand while maintaining manageable device complexity through controlled mechanical motion.
Solution Approach 2:
The patent applies universality by designing the actuator assembly to perform multiple functions: adjusting lens position, changing lens orientation, and coordinating movements to maintain proper optical alignment. This multi-functional approach consolidates what could be multiple separate mechanisms into a unified system, reducing overall device complexity while achieving expanded viewing angles.
4Reliability
If real-time lens adjustment is implemented, then focus is improved, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing real-time lens adjustment that operates continuously during use. The system periodically updates lens position and orientation based on ongoing eye-tracking data, maintaining accurate focus without requiring constant high-power actuation. This periodic adjustment approach improves focus accuracy while managing energy consumption through efficient, on-demand actuation rather than continuous operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the user's viewing experience by dynamically adjusting the lens position and orientation to match eye movement, thereby improving focus and expanding the viewing angle.
Implementation Method 1
the illumination source is adapted to illuminate the subject's pupil, thereby generating a reflected beam and the sensor is adapted to detect the reflected beam
Data Source
AI summary
The disclosure is generally directed to an optical device and method of use, and in particular, an optical device with lenses moveable with a user's gaze.