Eye Tracking Device Infrared Light Control for Iris Recognition
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Solution Overview
Problem
Existing eye tracking devices face challenges in accurately determining the direction of line-of-sight and user identity due to interference from excessive or insufficient infrared light spots, which affect the collection of eye characteristics during iris recognition and eye tracking functions.
Innovation Solution
The eye tracking device employs multiple infrared light groups with different configurations and control circuits to adjust the number of infrared lights achieving effective operating brightness, ensuring fewer lights are used for iris recognition to minimize interference and more lights are used for eye tracking to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of infrared lights achieving effective operating brightness is increased for eye tracking function, then the accuracy of line-of-sight calculation is improved, but the iris image quality deteriorates due to too many infrared light spots hiding eye characteristics
Solution Approach 1:
The patent applies dynamics by making the number of active infrared lights adjustable rather than fixed. The control circuit dynamically changes the number of infrared lights achieving effective operating brightness based on the selected function: more lights are activated for eye tracking to improve line-of-sight accuracy, while fewer lights are activated for iris recognition to preserve eye characteristics information.
Solution Approach 2:
The patent changes the parameter of infrared light quantity based on the functional mode. By adjusting the number of infrared lights that achieve effective operating brightness according to whether the device is performing eye tracking or iris recognition, the system optimizes performance for each specific function while avoiding the drawbacks of the other.
2Loss of information
If the number of infrared lights achieving effective operating brightness is decreased for iris recognition function, then the eye characteristics collection is improved, but the line-of-sight tracking accuracy deteriorates due to insufficient infrared light spots
Solution Approach 1:
The system dynamically adjusts the number of active infrared lights based on the operational mode. When iris recognition is selected, fewer infrared lights are activated to prevent light spots from obscuring eye characteristics. When eye tracking is selected, more infrared lights are activated to provide sufficient light spots for accurate line-of-sight calculation.
Solution Approach 2:
The patent implements parameter changes by adjusting the quantity of infrared lights achieving effective operating brightness according to the selected function. This allows the system to optimize the balance between information preservation and measurement precision for different operational requirements.
3Device complexity
If a fixed number of infrared lights are used for both iris recognition and eye tracking functions, then the device complexity is reduced, but the performance of both functions deteriorates due to inability to optimize light quantity for each function
Solution Approach 1:
The patent introduces dynamic control capability where the control circuit can adjust the number of active infrared lights based on the selected function. Although this increases device complexity, it significantly improves the reliability and performance of both iris recognition and eye tracking functions by allowing optimization of infrared light quantity for each specific application.
Solution Approach 2:
The patent implements multi-functionality by enabling the same infrared light group to serve different purposes (iris recognition and eye tracking) with optimized parameters for each function. The control circuit universally manages the infrared lights to adapt to different operational requirements, making the system versatile while maintaining good performance across multiple functions.
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 approach allows for accurate user identity verification and precise line-of-sight determination by optimizing infrared light usage, reducing interference and improving image quality for both iris recognition and eye tracking functions.
Implementation Method 1
each of the at least one infrared light group includes at least two infrared lights
Implementation Method 2
infrared light which is emitted when the infrared light group arranged at the first location works
Implementation Method 3
each of the at least one infrared camera is configured to collect an eye image of a user when the at least two infrared lights are turned on
Data Source
AI summary
An eye tracking device and a head-mounted display device are provided. The eye tracking device includes at least one infrared camera, at least one infrared light, group and a control circuit. The control circuit is electrically connected with the at least one infrared light group. Each of the at least one infrared light group includes at least two infrared lights which are arranged at different locations. Each of the at least one infrared camera is configured to collect an eye image of a user when the at least two infrared lights are turned on. The control circuit is configured to respectively control the number of infrared lights achieving effective operating brightness in each infrared light group when the eye tracking device performs iris recognition and eye tracking, and the effective operating brightness refers that a brightness is not less than a threshold brightness.