Eye-Tracked AR Waveguide Optics With Dynamic Focal Adjustment
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Solution Overview
Problem
Existing augmented reality glasses face challenges in providing optimal comfort, stability, and clarity of image presentation across varying focal lengths, leading to user discomfort and reduced immersion.
Innovation Solution
An optical device with an image module, focusing module, waveguide sheet, eye-sensing module, and processing module, which adjusts the imaging distance of projected images based on the user's gaze point using solid or liquid lenses, and generates different effects based on the user's center of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed focal length is used in augmented reality glasses, then the device structure is simple, but the user experiences discomfort and reduced immersion when viewing at varying distances
Solution Approach 1:
The patent employs a liquid lens focusing module that can dynamically adjust its focal length in real-time based on user gaze detection. The liquid lens changes its curvature through voltage control to accommodate different viewing distances, transforming the static optical system into a dynamic one that adapts to user needs without requiring mechanical moving parts.
Solution Approach 2:
The invention changes the optical parameter of focal length by controlling the liquid lens properties. By varying the voltage applied to the liquid lens, the focal length is continuously adjusted to match the distance information detected from user gaze, enabling clear viewing at multiple distances while maintaining a relatively simple device structure.
2Adaptability or versatility
If multiple fixed focal length lenses are used to provide different viewing distances, then the adaptability is improved, but the device complexity and size increase
Solution Approach 1:
The liquid lens focusing module serves multiple functions by continuously adjusting its focal length to accommodate various viewing distances. Instead of requiring separate lenses for different focal lengths, a single liquid lens dynamically performs the role of multiple fixed lenses, reducing device complexity while maintaining high adaptability.
Solution Approach 2:
The invention uses parameter changes in the liquid lens (voltage control) to achieve continuous focal length adjustment. This allows a single focusing module to provide adaptable viewing across multiple distances, eliminating the need for multiple discrete focusing modules and reducing overall device complexity.
3Manufacturing precision
If the imaging distance is fixed, then the optical system is simple and stable, but the clarity and stability of image presentation deteriorate when viewing at different distances
Solution Approach 1:
The system incorporates a feedback loop where the eye-sensing module detects user gaze position and distance information, which is then fed back to the processing module. The processing module uses this feedback to control the liquid lens focusing module, continuously adjusting the focal length to maintain optimal image clarity and stability at the user's current viewing distance.
Solution Approach 2:
The invention replaces traditional mechanical focusing mechanisms (such as movable lenses or adjustable mounts) with an electrically controlled liquid lens system. This substitution eliminates complex mechanical moving parts while achieving precise focal length adjustment through voltage control, thereby maintaining image clarity without increasing device complexity.
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 device provides optimal focal length adjustment for clear viewing, preventing dizziness and enhancing the immersive experience by aligning the imaging distance with the user's focus, and allowing dynamic image adjustments and interactions.
Implementation Method 1
the focusing module includes a liquid lens and a driving module, and the processing module controls, in accordance with the distance information, the driving module to drive the liquid lens to deform to adjust the imaging distance of the projected image
Implementation Method 2
the focusing module includes a solid lens and an actuation module, and the processing module controls, in accordance with the distance information, the actuation module to actuate the solid lens to linearly displace in relation to the waveguide sheet to adjust the imaging distance of the projected image
Implementation Method 3
the projected light passes through the focusing module from the exit pupil region to the entrance pupil region and forms a projected image in the imaging region
Data Source
AI summary
An optical device includes an image module, a focusing module, a waveguide sheet having an entrance pupil region and an imaging region, an eye-sensing module, and a processing module electrically connected to the previous four. The image module generates a projected light. An optical axis of the focusing module is aligned with that of the image module. The entrance pupil region faces the focusing module. The projected light passes through the focusing module to the entrance pupil region and forms a projected image having an imaging distance and including at least one image position having distance information in the imaging region. The eye-sensing module senses a center of sight corresponding to one image position. The processing module takes the image position as a first image position and controls, in accordance with the distance information, the focusing module to adjust the imaging distance. An imaging method therefor is also provided.