AR Display Module Lens Tilt for Off-Axis Image Positioning
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Solution Overview
Problem
Conventional display modules for augmented reality devices face challenges in positioning images without disturbing the user's field of view, leading to issues like resolution degradation and distortion when images are shifted from the central field of view.
Innovation Solution
A display module comprising an output unit, a lens unit with a virtual central axis, and a guide unit with total reflection surfaces, which allows the image to be positioned at a predetermined angle outside the user's central field of view, correcting distortion through tilting of the lens unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the image is positioned in the user's central field of view, then the image is easily visible, but it obstructs the actual field of view and causes distortion
Solution Approach 1:
The patent positions the image in a deflected direction at a predetermined angle away from the central field of view, utilizing angular displacement as an additional spatial dimension. This allows the image to remain visible while avoiding obstruction of the central field of view, resolving the contradiction between image visibility and field of view clearance
Solution Approach 2:
The patent introduces a tilting mechanism that changes the angular parameter of the lens unit relative to the optical axis. By adjusting this tilt angle, the system can position the image at optimal angles away from the central field of view while maintaining proper focus and minimizing distortion, thus resolving the contradiction through parameter optimization
2Object-affected harmful factors
If the image is deflected from the central field of view, then the field of view is not obstructed, but resolution degrades and distortion occurs
Solution Approach 1:
The patent employs a tilting mechanism that adjusts the angular parameter of the lens unit, allowing the image to be positioned at predetermined angles away from the central field of view while maintaining optimal focus. This parameter adjustment enables the system to achieve both field of view clearance and acceptable image quality by optimizing the tilt angle
Solution Approach 2:
The patent introduces a dynamic tilting mechanism that can adjust the lens unit's angle relative to the optical axis. This dynamic adjustment capability allows the system to optimize image positioning and minimize distortion based on operational requirements, resolving the contradiction between field of view clearance and image quality
3Manufacturing precision
If lenses and mirrors are added to adjust the image path, then the image can be positioned correctly, but the device weight and size increase
Solution Approach 1:
The patent integrates the tilting mechanism directly into the lens unit structure, merging the positioning function with the existing optical components. This integration eliminates the need for separate heavy adjustment mechanisms while achieving accurate image positioning, thus resolving the contradiction between positioning accuracy and device weight
Solution Approach 2:
The patent employs a dynamic tilting mechanism that provides precise image positioning through angular adjustment of the lens unit. This dynamic approach replaces static, bulky mechanical adjustment systems with a more compact and lightweight solution that achieves the same positioning accuracy
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 stable image positioning outside the central field of view, maintaining image quality and comfort for the user's eye movement, while correcting distortion caused by the shifted image position.
Implementation Method 1
a guide unit formed to be elongated to have at least a pair of total reflection surfaces facing each other and of which the image transmitted through the lens unit is incident on one side to move to the other side through total internal reflection at least one or more times
Data Source
AI summary
Disclosed is a display module including an output unit configured to form an image to output the image forward, a lens unit configured to have a virtual central axis in front of the output unit and transmit the image so that an optical axis of the image transmitted from the output unit is parallel with the central axis to transmit the image forward, and a guide unit formed to be elongated to have at least a pair of total reflection surfaces facing each other and of which the image transmitted through the lens unit is incident on one side to move to the other side through total internal reflection at least one or more times and the image is reflected on the other side through a separate exit surface to be provided to the user's field of view.