EOG Electrode Arrangement for Eye Movement Detection
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Solution Overview
Problem
Existing electro-oculographic detection systems, particularly those using eyewear with electrodes on the nose pads, face challenges in accurately detecting eye movements due to weak electro-oculographic signals that are easily degraded by ambient noise, leading to difficulties in distinguishing various ocular actions such as blinking, closing, and winking.
Innovation Solution
The arrangement of at least four EOG electrodes around both eyes, symmetrically positioned with respect to a vertical line passing through the centers of the eyes, avoids predetermined areas where polarity inflection points occur, allowing for the detection of distinct channel signals that effectively distinguish horizontal and vertical eye movements, blinking, and winking by enhancing signal amplitude and reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EOG electrodes are provided on the nose pads, then the device can detect electro-oculographic changes, but the detected electro-oculograph is weak and easily degraded by ambient noise
Solution Approach 1:
The patent changes the electrode arrangement parameters from the conventional nose pad position to positions on the lens frames at the outer sides of the eyes. This parameter change in electrode location results in a stronger electro-oculographic signal with increased dynamic range, resolving the contradiction between detection reliability and signal strength.
2Measurement precision
If a stronger electro-oculograph is detected, then the dynamic range increases and allows for more threshold values, but the electrode arrangement becomes more complex
Solution Approach 1:
The patent segments the electrode system into four distinct electrodes (two positive, two negative) positioned at specific locations on the lens frames. This segmentation allows each electrode to contribute to detecting different components of eye movement, achieving strong signal amplitude while maintaining a manageable arrangement complexity through systematic positioning.
Solution Approach 2:
The patent employs asymmetric positioning of positive and negative electrodes relative to each eye, with specific electrodes placed at predetermined positions on the lens frames. This asymmetric arrangement optimizes the detection of electro-oculographic changes while avoiding the complexity of symmetric configurations, enabling strong signal detection with simplified electrode placement.
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
This electrode arrangement enables highly accurate detection of various eye movements by increasing signal amplitude and reducing noise interference, allowing for precise identification of ocular actions, even in noisy environments.
Implementation Method 1
the way in which the electro-oculograph changes depends on the ocular actions (eye-motion) of the wearer (vertical or horizontal movement, blinking, and so on)
Data Source
AI summary
According to one embodiment, at least four EOG electrodes are provided with the periphery of user's eyes. The left eye side electrodes and the right eye side electrodes are arranged symmetrically with respect to a vertical line passing the middle of a line connecting the centers of both eyes. Two electrodes above and two electrodes below the line connecting the centers of both eyes are arranged to avoid area AXL including an inflection point where an EOG detection polarity differs in the right and left of a vertical line passing the center of the left eye and area AXR including an inflection point where an EOG detection polarity differs in the right and left of a vertical line passing the center of the right eye.