Eye Projection System with Adjustable Optical Deflectors
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Solution Overview
Problem
Conventional virtual and augmented reality eye projection systems cause eye fatigue and discomfort due to inaccuracies in focal length, leading to discrepancies in focal distances between the projected image and the user's eyes, and variations in the relative position and orientation of the projection device to the eye, resulting in headaches and discomfort.
Innovation Solution
A novel eye projection technique that directly projects images onto the retina without an intermediate optical image plane, using adjustable optical deflectors to compensate for changes in eye position and gaze direction, ensuring accurate image placement and stability on the retina, while filtering out tremor movements to prevent retina fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional eye projection systems are used to project images to user eyes, then virtual or augmented reality perception is provided, but eye fatigue and discomfort occur due to inaccuracies in focal length and discrepancies in focal distances
Solution Approach 1:
The system dynamically adjusts the propagation path of light beams using adjustable optical deflectors to compensate for eye movements and maintain accurate focus on the retina. The deflectors are controlled in real-time based on eye position feedback, making the focal distance adaptive rather than fixed.
Solution Approach 2:
The system incorporates eye position sensing that provides feedback to the control mechanism. This feedback loop enables the system to detect eye movements and adjust the optical deflectors accordingly, ensuring the projected image remains accurately focused on the retina despite eye position changes.
2Adaptability or versatility
If the projection device position relative to the eye varies, then adaptability to different users is improved, but image stability on the retina deteriorates
Solution Approach 1:
The optical deflectors are dynamically adjusted based on detected eye position to compensate for variations in device-to-eye distance and orientation. This dynamic compensation maintains image stability on the retina across different users and wearing conditions.
Solution Approach 2:
The system changes the propagation path parameters (angle, position) of the light beam through adjustable optical deflectors to compensate for variations in device positioning relative to the eye, maintaining consistent image focus and stability.
3Measurement precision
If optical deflectors are added to compensate for eye movements, then image focus accuracy is improved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical adjustment mechanisms with controllable optical deflectors that can be adjusted electronically based on eye position feedback. This substitution reduces mechanical complexity while maintaining or improving precision.
4Measurement precision
If the propagation path is adjusted to track eye movements, then image placement accuracy on the retina is improved, but the system response time requirement increases
Solution Approach 1:
The real-time feedback from eye position sensing enables the system to detect and respond to eye movements immediately. The control system processes this feedback and adjusts the optical deflectors accordingly, maintaining accurate image placement on the retina with minimal latency.
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 significantly reduces eye fatigue and discomfort by maintaining image stability and focus on the retina, regardless of eye movements or changes in the projection system's position relative to the eye, providing improved depth of field and comfort during virtual or augmented reality experiences.
Implementation Method 1
an optical assembly for directing the light beam from the image projection system to the eye, including adjustable optical deflectors arranged along a general optical path
Data Source
AI summary
An eye projection device is provide comprising an eye projection system configured for projecting a light beam to propagate along a propagation path to an eye. The eye projection system comprises: an optical assembly defining a general optical path of light in said optical assembly, the optical assembly comprising a deflector arrangement comprising one or more adjustable optical deflectors arranged along said general optical path and configured to define an adjustable propagation path of the light beam from the optical assembly to the eye; wherein said one or more optical deflectors are configured with at least three adjustable deflection parameters affecting deflection of said propagation path to provide at least three degrees of freedom in adjusting the propagation path of said light beam towards said eye; wherein two of said at least three degrees of freedom are associated with two angular orientations of the propagation path to the eye for compensating over angular changes in a gaze direction of the eye, and at least one of said at least three degrees of freedom are associated with a lateral deflection of the propagation path for compensating over variations in a relative lateral position of said projection system relative to the eye.