Eye Tracking Display Integrating Light-Receiving Element
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Solution Overview
Problem
Existing eye-tracking electronic devices, such as head-mounted displays, are bulky due to separate optical sensors and displays, and face difficulties in focusing images and detecting eye movements effectively due to complex optical systems.
Innovation Solution
A compact electronic device with an eye-tracking function incorporating a display device, an infrared light source, and a novel optical system that includes a first optical element for image transmission to the eyeball and a second optical element for detecting reflected infrared light, with the option of a mirror and a driving mechanism to adjust optical elements for accurate gaze detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optical sensors and displays are provided, then eye tracking function is achieved, but device size becomes large
Solution Approach 1:
The patent combines the display element and light-receiving element into a single display device structure. The light-receiving element is positioned to detect infrared light reflected from the eyeball while the display element provides visual output, integrating both functions in one compact unit rather than using separate components.
Solution Approach 2:
The display device serves multiple functions: it acts as both a display element for presenting visual information and a light-receiving element for detecting reflected infrared light from the eyeball. This multi-functionality reduces the overall device size by eliminating the need for separate dedicated sensor and display components.
2Volume of moving object
If a single optical system is used for both viewing and detection, then device size is reduced, but image focusing and detection accuracy become difficult
Solution Approach 1:
The optical system is segmented into distinct optical paths: one path for viewing the display element and another path for detecting reflected infrared light. The light-receiving element is positioned at a specific location to receive reflected light through a defined optical path that is separate from the direct viewing path, allowing independent optimization of each function.
Solution Approach 2:
Different regions of the display device are assigned different functional properties. The display element region is optimized for light emission and viewing, while the light-receiving element region is optimized for detecting reflected infrared light. This local differentiation allows each component to perform its function with high precision despite the compact integrated structure.
3Measurement precision
If optical elements are added for accurate detection, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces a driving mechanism that can move or rotate the optical elements (first and second optical elements) to dynamically adjust the optical path. This dynamic adjustment capability allows the system to optimize detection accuracy for different eye positions and gazes without requiring a complex fixed optical structure, simplifying the overall design while maintaining precision.
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 enables a downsized, low-power, high-resolution eye-tracking electronic device that effectively detects eye movements without compromising image quality, allowing for precise gaze tracking and enhanced user interaction.
Implementation Method 1
the light-receiving element has a function of detecting the infrared light reflected by an eyeball
Implementation Method 2
a first optical element positioned on an optical path through which an image from the display element enters the eyeball
Implementation Method 3
a second optical element positioned on an optical path through which the reflected infrared light enters the light-receiving element
Data Source
AI summary
A downsized electronic device with an eye tracking function is provided. The electronic device with an eye tracking function includes a display device, an infrared light source, and an optical system. The display device includes a display element and a light-receiving element; the infrared light source has a function of emitting infrared light; the light-receiving element has a function of detecting the infrared light reflected by an eyeball; and the optical system includes a first optical element positioned on an optical path through which an image from the display element enters the eyeball and a second optical element positioned on an optical path through which the reflected infrared light enters the light-receiving element. The light-receiving element is integrated with the display device and thus, the electronic device can have a reduced size.