Dual Gaze Tracking for Head-Mounted Displays Under Power Constraints
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Solution Overview
Problem
Existing head-mounted devices face challenges in efficiently tracking user gaze with optimal power consumption and accuracy, particularly in varying usage scenarios.
Innovation Solution
Incorporation of a dual gaze tracking system comprising a low-power gaze tracking system and a glint-based gaze tracking system, allowing the device to switch between modes based on power and accuracy requirements, using light-emitting devices and light detectors to measure eye reflections for precise gaze detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a glint-based gaze tracking system is used to achieve high measurement precision, then gaze tracking accuracy is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between glint-based and low-power gaze tracking modes based on operational requirements. The controller selects the appropriate tracking system depending on whether high precision is needed or power conservation is prioritized, making the system adaptable rather than static.
Solution Approach 2:
The gaze tracking functionality is divided into two separate systems: a glint-based system for high-precision tracking and a low-power system for energy-efficient operation. Each system handles specific scenarios, allowing the device to segment the overall gaze tracking task into precision-critical and power-critical portions.
2Adaptability or versatility
If a dual gaze tracking system is implemented to provide both high accuracy and low power modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
Both gaze tracking systems share common components including light-emitting devices that illuminate the user's eye and a controller that manages both tracking modes. This multi-functional design allows a single device to provide both high-precision and low-power operation capabilities without completely separate hardware sets.
Solution Approach 2:
The patent combines the glint-based gaze tracking system and the low-power gaze tracking system into a single integrated device. The light-emitting devices and controller serve both systems, merging functions to reduce overall complexity while maintaining the benefits of having both tracking modes available.
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 dual gaze tracking system effectively manages power consumption while maintaining accurate gaze tracking, enhancing user interaction by enabling efficient display of foveated content and providing context-aware services.
Implementation Method 1
A glint-based gaze tracking system may include light-emitting devices that emit light beams that create eye glints on the surface of a user's eyes and may include an image sensor that measures the eye glints
Implementation Method 2
The low-power gaze tracking system may use light detectors to measure light reflections from the user's eyes. The light reflections may correspond to reflections of the light beams emitted by the light-emitting devices used by the glint-based gaze tracking system
Data Source
AI summary
A head-mounted device may have a head-mounted support structure. Gaze tracking systems may be supported by the support structure so that the gaze of a user may be monitored. Lenses may be supported by the support structure. Display systems may provide computer-generated images to the user while the user is viewing real-world objects through the lenses. The gaze tracking systems may include image-sensor-based systems such as glint-based systems. A glint-based gaze tracking system may include light-emitting devices that emit light beams that create eye glints on the surface of a user's eyes and may include an image sensor that measures the eye glints to gather information on the user's gaze. A low-power gaze tracking system may be included in the head-mounted device. The low-power gaze tracking system may use light detectors to measure the magnitudes of respective light reflections of the light beams.