Compact Eye Tracking for Video Glasses Using Integrated Optical Path
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Solution Overview
Problem
Existing eye tracking devices are complex and large in size, making them unsuitable for integration into video glasses for applications like virtual reality and augmented reality.
Innovation Solution
An eye tracking device for video glasses comprising a light source component, a reflection component, and an image sensor component, which emits invisible light, reflects it, and generates an image of the eyeball to determine the gaze direction, with a main control component processing this information for accurate tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional eye tracking devices are used, then measurement precision is achieved, but device complexity and size increase
Solution Approach 1:
The patent combines the light source component, reflection component, image sensor component, and main control component into an integrated eye tracking device that can be embedded in video glasses. The reflection component is integrated with the lens structure, and all components work together in a unified optical path design, reducing overall device complexity while maintaining measurement precision.
Solution Approach 2:
The reflection component serves dual functions: it reflects invisible light from the light source component to the eyeball and also reflects the reflected light to the image sensor component. This multi-functionality reduces the need for separate components, thereby simplifying the overall device structure while maintaining accurate gaze direction detection.
2Measurement precision
If traditional eye tracking devices are used, then measurement precision is achieved, but device size increases
Solution Approach 1:
The eye tracking device components are nested within the video glasses structure. The reflection component is integrated into the lens, the light source component is positioned within the frame, and the image sensor component is embedded in the housing, creating a compact nested arrangement that minimizes device volume while preserving measurement precision.
Solution Approach 2:
The patent utilizes the three-dimensional space within the video glasses by positioning components in different spatial dimensions. The light source component emits light in one direction, the reflection component redirects light at specific angles, and the image sensor component captures reflected light from a different position, creating an efficient spatial arrangement that reduces overall device volume.
3Measurement precision
If invisible light is used for eye tracking, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The light source component emits invisible light in periodic pulses rather than continuous emission. This periodic action allows the image sensor component to capture eyeball images during the light emission periods while consuming less energy during non-emission periods, thereby reducing overall energy consumption while maintaining measurement precision through adequate sampling.
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 compact and efficient eye tracking system that allows users to control display terminals with eye movements, enhancing human-computer interaction and reducing device size while maintaining accuracy.
Implementation Method 1
The light source component is configured to emit invisible light to an eyeball
Implementation Method 2
the reflection component is configured to reflect the invisible light reflected by the eyeball
Data Source
AI summary
An eye tracking device and an eye tracking method applied to video glasses, and video glasses are provided. The eye tracking device includes a light source component, a reflection component, an image sensor component and a main control component. The light source component is configured to emit invisible light to an eyeball, the reflection component is configured to reflect the invisible light reflected by the eyeball, the image sensor component is configured to generate an image of the eyeball based on the invisible light reflected by the reflection component, and the main control component is coupled to the image sensor component and is configured to acquire a gaze direction based on the image of the eyeball.