Smart Glasses With Pupil-Tracked Dynamic Eye Box Projection
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Solution Overview
Problem
Existing smart glasses with retina scan displays have a limited eye box due to the size of their components, requiring precise alignment of the user's pupil for image visibility, which restricts the imaging region and is not adaptable to gaze direction changes.
Innovation Solution
An optical system with a light source, tracking module, and image forming module that adjusts the image plane and imaging region based on pupil position, using elements like micromirrors and holographic optical elements to dynamically adjust the eye box, allowing for gaze direction changes and improved image perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of optical components is reduced to fit smart glasses, then the device becomes wearable and compact, but the eye box size is limited and requires precise pupil alignment
Solution Approach 1:
The patent applies dynamics by making the eye box adjustable and adaptable to different pupil positions. The optical system dynamically modifies the imaging region based on detected pupil location, transforming a static limited eye box into a dynamic adaptable one, thereby resolving the contradiction between compact component size and sufficient imaging area
Solution Approach 2:
The patent changes the parameter of the imaging region by adjusting its position and size according to the detected pupil position. This parameter adaptation allows the system to maintain an adequate eye box despite using compact optical components, as the imaging region is repositioned to align with the user's actual pupil location
2Device complexity
If a fixed imaging region is used to simplify the optical system, then device complexity is reduced, but the system cannot adapt to gaze direction changes and requires precise initial alignment
Solution Approach 1:
The patent implements feedback by using a tracking module to detect the pupil position and feeding this information back to adjust the imaging region. This closed-loop feedback mechanism enables the optical system to automatically adapt to gaze direction changes without requiring complex manual realignment, balancing simplicity with adaptability
Solution Approach 2:
The system performs self-service by automatically detecting the user's pupil position and adjusting the imaging region accordingly, without requiring external intervention or complex mechanical adjustment mechanisms. This self-adjusting capability provides adaptability to gaze changes while maintaining relatively simple device architecture
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
Enables easy alignment and dynamic adjustment of the eye box to the user's pupil, ensuring clear image projection even with gaze direction changes, providing a natural view and enhanced resolution in the central field of view.
Implementation Method 1
a tracking module for acquiring the pupil position of a pupil of the eye
Implementation Method 2
The image forming module can comprise at least one reflective element, for example, for instance a micromirror, which can be configured such that it can be tilted or reduced about at least a longitudinal axis and a transverse axis
Implementation Method 3
a holographic element that redirects the light through the pupil of the user
Data Source
AI summary
Smart glasses including an optical system for projecting a projection image onto an imaging region of an eye. The optical system includes a light source for outputting an image, a tracking module for acquiring the pupil position of a pupil of the eye, and an image forming module for forming the output image into a to-be-projected image. The image forming module is configured to change an image plane of the to-be-projected image as a function of a pupil position acquired by the tracking module. The optical system also includes a reflection module, which is configured to project the to-be-projected image as a projection image into the imaging region of the eye.