Electrooculographic Sensor for Head-Mounted Gaze Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current head-mounted devices lack efficient gaze tracking capabilities, particularly in monitoring eye movements and direction, which limits their ability to provide context-aware interactions with the user's environment and display foveated content effectively.
Innovation Solution
The integration of electrooculographic sensors with eye monitoring electrodes that measure the standing potential between the retina and cornea, combined with optional image-sensor-based gaze tracking systems, to determine the direction of a user's gaze and track eye movements, allowing for context-aware interactions and display adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrooculographic sensors with eye monitoring electrodes are integrated into head-mounted devices, then gaze tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The electrooculographic sensor system is segmented into multiple independent electrodes positioned at specific locations around the eye (e.g., upper/lower temporal and nasal positions). Each electrode independently measures voltage signals, and the control circuitry processes signals from multiple electrodes to calculate gaze direction through coordinate transformations. This segmentation enables accurate 3D gaze tracking while maintaining modular electrode placement that can be integrated into head-mounted device structures.
Solution Approach 2:
The patent introduces an intermediary computational layer in the control circuitry that transforms raw voltage signals from electrodes into meaningful gaze direction data. The control circuitry applies mathematical models (e.g., converting voltage differences to angular positions using transformation matrices) to bridge the gap between simple voltage measurements and accurate gaze direction determination, thereby achieving high measurement precision through software-based processing rather than complex hardware.
2Measurement precision
If multiple electrodes are positioned around the user's eye to measure standing potential, then eye movement detection accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The electrode array design is made universal by positioning electrodes at standardized anatomical landmarks around the eye (upper temporal, lower temporal, upper nasal, lower nasal positions). This universal configuration can detect various eye movements (horizontal, vertical, diagonal) and facial expressions using the same electrode layout, eliminating the need for custom electrode arrangements for different measurement types and simplifying the manufacturing process.
Solution Approach 2:
The patent employs parameter changes in the signal processing domain rather than hardware complexity. By adjusting the mathematical transformation parameters and reference electrode selections in the control circuitry, the same physical electrode configuration can accurately measure different gaze directions and eye movement patterns, thereby achieving high measurement precision through software parameter optimization rather than complex electrode positioning.
3Adaptability or versatility
If electrooculographic sensors are used to track eye motion in different operating modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The electrooculographic sensor system implements dynamic adaptability through software-based operating modes in the control circuitry. The system can dynamically switch between different signal processing algorithms and reference electrode configurations based on the current operating mode requirements (e.g., gaze tracking vs. blink detection). This dynamic reconfiguration of processing parameters rather than physical hardware enables versatile multi-mode operation while maintaining a fixed, simple electrode array structure.
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
Enables accurate tracking of user gaze and eye movements, enabling context-aware interactions and efficient display of foveated content, improving user experience by providing relevant information and enhancing interaction with the environment.
Implementation Method 1
Electrodes in an electrooculographic sensor may measure signals resulting from the standing potential between the retina and cornea in the eye
Data Source
AI summary
A head-mounted device may have a head-mounted housing. The head-mounted housing may have displays that overlap a user's eyes and/or speakers that provide sound to the user's ears. The head-mounted housing may have transparent lenses that overlap the eyes of the user or may have opaque structures that prevent ambient light from reaching the user's eyes. The head-mounted device may have a geographic location sensor such as a satellite navigation system sensor and may include an orientation sensor such as an inertial measurement unit. The direction of a user's gaze relative to the head mounted device may be measured using an electrooculographic sensor. Electrodes in the electrooculographic sensor may measure signals resulting from the standing potential between the retina and cornea in the eye. Facial expressions and eye blinks may affect the signals detected with the electrodes and can be monitored during operation.