Smart Glasses Eye Blink Detection With Electrostatic Sensors
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Solution Overview
Problem
Existing eye movement detection techniques suffer from measurement noise, artifacts, and errors due to environmental interference and physical contact with the user's skin, and lack effective eye tracking features.
Innovation Solution
A method using electrostatic charge variation sensors integrated into glasses to detect eye movements, processing signals to differentiate between voluntary and involuntary blinks, and track eye orientation, while minimizing environmental interference and skin contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are placed in contact with the skin to detect eye movements, then measurement sensitivity is improved, but measurement noise and artifacts increase due to environmental interference and muscle signals
Solution Approach 1:
The patent introduces an intermediary optical system (camera and lenses) that detects eye movements indirectly through light reflection and refraction rather than direct electrical contact. This mediator converts physical eye movements into optical signals that can be analyzed without suffering from the noise and artifacts that plague direct electrical measurement methods
Solution Approach 2:
The patent replaces the electrical measurement system (electrodes detecting CRP) with an optical detection system (cameras capturing eye images). This substitution eliminates the harmful electrical artifacts and environmental interference while maintaining the ability to detect eye movement patterns through image analysis
2Adaptability or versatility
If multiple electrodes are placed around the eye to track eye movements, then eye tracking capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the optical system multi-functional by using the same camera and image processing algorithms to perform multiple tasks: detecting blinks, tracking eye movements, determining gaze direction, and analyzing eye orientation. This single optical system replaces what would otherwise require multiple specialized sensors and electrode arrays
Solution Approach 2:
The patent combines multiple eye movement detection functions into a unified optical detection system. Instead of using separate electrodes for blink detection, eye tracking, and gaze monitoring, the invention merges these functions into one integrated camera-based system that captures all eye movement information simultaneously through image analysis
3Ease of operation
If electrodes are placed in contact with the skin, then ease of operation is improved, but reliability decreases due to slipping and moisture effects
Solution Approach 1:
The patent uses an optical intermediary system that does not require direct contact with the skin, eliminating the reliability issues associated with electrode-skin contact. The optical system can detect eye movements through the air interface, making measurements stable and reliable regardless of skin moisture or electrode positioning
Solution Approach 2:
The patent transitions from a contact-based measurement approach (electrodes on skin surface) to a non-contact optical measurement approach (camera capturing eye images through air). This dimensional change from direct physical contact to remote optical detection eliminates the reliability problems caused by skin moisture and electrode slippage while maintaining ease of 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
Accurately detects eye movements and blinks, providing insights into user attention levels and cognitive states, and enabling advanced device functions, while reducing noise and contact-related errors.
Implementation Method 1
first electrostatic charge variation sensors fixed to the frame and therefore arranged in proximity to the eyes of the user when the latter wears the glasses... each first electrostatic charge variation sensor comprising two or more electrodes spaced from each other and fixed to the frame... detect variations in electrostatic charge
Data Source
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AI summary
Detection method (50) of an activity of a first eye (30) of a user of a pair of glasses (10) comprising a first (22a) and a second (22b) electrode facing the first eye (30) and configured to detect respective electrostatic charge variations generated by a movement of the first eye (30). The detection method, performed by a control unit (21, 15) of the glasses (10), comprises the steps of: acquiring (S10-S14), through the first (22a) and second (22b) electrodes, a first electrostatic charge variation signal (SQ,1a) indicative of a difference between the electrostatic charge variations; verifying (S16, S18) the presence of one or more blink patterns in the first electrostatic charge variation signal (SQ,1a), each blink pattern being indicative of a respective voluntary blink or involuntary blink; if the first electrostatic charge variation signal (SQ,1a) has said one or more blink patterns, for each blink pattern determining (S20, S22; S20', S22) by the control unit (21, 15) whether said blink pattern is indicative of a respective voluntary blink and detecting a involuntary blink or a voluntary blink.