Eye Tracking Device Non-Coplanar Infrared Elements
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Solution Overview
Problem
Current eye tracking technologies face limitations in accurately tracking eye movements and interpreting gaze direction for human-computer interaction due to distractions from visible light and suboptimal light distribution, affecting the clarity and precision of eye movement tracking.
Innovation Solution
An eye tracking device with a non-coplanar arrangement of an infrared light emitting element and an image acquisition element, utilizing a photoconductive layer with microprisms and light absorbing material to emit and receive near-infrared light, ensuring even distribution and appropriate brightness, thereby enhancing the accuracy of eye movement tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visible light is used for eye tracking, then the eye tracking system can operate, but visible light causes distractions to users and reduces tracking accuracy
Solution Approach 1:
The patent transitions from using visible light to near-infrared light for eye tracking. This wavelength change makes the light invisible to human eyes, eliminating user distraction while maintaining tracking functionality. The infrared light emitting element specifically emits near-infrared light that cannot be perceived by users, thus resolving the contradiction between tracking accuracy and user comfort.
2Measurement precision
If conventional light emitting arrangement is used, then the device structure is simple, but light distribution is suboptimal affecting tracking clarity
Solution Approach 1:
The patent introduces a photoconductive layer with microprisms as an intermediary component between the infrared light emitting element and the target. This layer receives infrared light and redistributes it through the microprism structure, achieving even light distribution across the field of view. The intermediary layer resolves the contradiction by providing optimal light distribution without requiring direct complex optical paths.
Solution Approach 2:
The photoconductive layer incorporates microprisms with specific geometric configurations that locally control light distribution. Each microprism is designed to redirect light in specific directions, creating uniform illumination across different viewing angles. This local optimization of light quality resolves the contradiction between tracking clarity and structural simplicity.
3Measurement precision
If coplanar arrangement of light emitting and image acquisition elements is used, then manufacturing is easier, but tracking accuracy is reduced
Solution Approach 1:
The patent transitions from a coplanar two-dimensional arrangement to a three-dimensional non-coplanar configuration. The infrared light emitting element and image acquisition element are positioned at different heights and angles relative to each other, creating a立体 spatial arrangement. This dimensional change enables accurate gaze direction measurement by providing multiple viewing angles and light paths, while the fixed geometric relationships in 3D space simplify alignment requirements during manufacturing.
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
The solution improves the accuracy and clarity of eye movement tracking by minimizing distractions and optimizing light distribution, allowing for more precise control of electronic devices using eye movements without user attention being diverted.
Implementation Method 1
an infrared light emitting element (30) and an image acquisition element (50) on the substrate (10)... the infrared light emitting element (30) emits infrared light towards the user's eyeball (20)... the image acquisition element (50) is used to receive and sense the infrared light reflected by the eyeball (20)
Implementation Method 2
utilizing a photoconductive layer with microprisms and light absorbing material to emit and receive near-infrared light, ensuring even distribution and appropriate brightness
Data Source
AI summary
An eye tracking device includes a substrate comprising a first substrate portion and a second substrate portion intersecting with the first substrate portion, an infrared light emitting element on the first substrate portion, and an image acquisition element on the second substrate portion. The infrared light emitting element is configured to emit infrared light to a user's eyeball. The image acquisition element and the infrared light emitting element are non-coplanar. The image acquisition element is configured to receive and sense the infrared light reflected by the eyeball for imaging.