Magnetometer-Based Eye Convergence Angle Measurement
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Solution Overview
Problem
Existing eye-mountable devices face challenges in accurately determining depth information due to high power consumption and heat issues associated with MEMS sensors, making them unsuitable for long-term use in products like digital contact lenses and head-mounted displays.
Innovation Solution
An eye-mountable electronic device utilizing a low-power magnetometer sensor that reports 3D angle readings, integrated into a contact lens or similar form factor, which adjusts to match the eye's gaze direction and provides accurate depth information by calculating the eye convergence angle between both eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MEMS sensors are used to detect eye convergence angle, then measurement precision is improved, but use of energy increases and device generates heat
Solution Approach 1:
The patent changes the sensing parameter from mechanical acceleration (MEMS) to magnetic field orientation (magnetometer). This parameter substitution enables eye convergence angle detection with significantly lower power consumption while maintaining measurement precision, as magnetometers consume less energy than MEMS sensors for angular measurements.
Solution Approach 2:
The patent replaces the mechanical MEMS sensor system with a magnetic field-based magnetometer system. This substitution eliminates the need for mechanical moving parts and high-power electronic components, thereby reducing power consumption and heat generation while preserving the ability to detect eye convergence angle accurately.
2Measurement precision
If MEMS sensors are used to detect eye convergence angle, then measurement precision is improved, but device temperature increases
Solution Approach 1:
The patent changes the sensing parameter from mechanical acceleration (MEMS) to magnetic field orientation (magnetometer). This parameter substitution enables eye convergence angle detection with significantly lower power consumption and heat generation, as magnetometers operate at lower temperatures compared to MEMS sensors.
Solution Approach 2:
The patent replaces the mechanical MEMS sensor system with a magnetic field-based magnetometer system. This substitution eliminates the need for mechanical moving parts and high-power electronic components, thereby reducing power consumption and heat generation while preserving the ability to detect eye convergence angle accurately.
3Measurement precision
If high power sensors are used for long period, then measurement precision is maintained, but harmful thermal effects increase
Solution Approach 1:
The patent changes the sensing parameter from mechanical acceleration (MEMS) to magnetic field orientation (magnetometer). This parameter substitution enables continuous long-term operation with low power consumption, eliminating the thermal heating effects that would otherwise occur with high-power MEMS sensors during prolonged use.
Solution Approach 2:
The patent replaces the mechanical MEMS sensor system with a magnetic field-based magnetometer system. This substitution eliminates the need for mechanical moving parts and high-power electronic components, thereby reducing power consumption and heat generation while preserving the ability to detect eye convergence angle accurately for extended periods.
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 detection of depth information and other depth-related measurements with reduced power consumption, allowing for longer device operation without heating issues and enabling features like vision correction and overlay displays.
Implementation Method 1
The magnetometer sensor or simply magnetometer may be incorporated into a small electronic device that can fit into a human eye... The magnetometer sensor is capable of reporting angle readings in three dimensions (3D) with very low power profile... detecting the gazing direction of the eye
Data Source
AI summary
An electronic device capable of determining an eye convergence angle using a magnetometer sensor is provided. The magnetometer sensor is capable of reporting angle readings in three dimensions that is aligned with an eye gaze direction of each eye of a user. The magnetometer which is incorporated into the device can fit into a human eye like a contact lens and determine the angle of the gaze direction of both eyes with respect to an object within a field of view. By obtaining this eye convergence angle for an object, it is possible to accurately detect depth information. The electronic device also functions as a digital contact lens that can automatically adjust the focal point of the object to provide the user with a clear vision. The electronic device also includes a display that provides the user with additional information about the object.