AR Display Prism Assembly with Curved Mirror for Wide FOV
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Solution Overview
Problem
Current Augmented Reality (AR) glasses face limitations such as restricted field of view, high cost, bulkiness, and difficulty in focusing due to the combination of real-world and virtual images.
Innovation Solution
A wide Field of View (FOV) display system that projects the maximum captured FOV from a micro-LED or micro-OLED display into a prism and then to a thin, glass, multi-layered mirror structure, utilizing micro-mirror strips and a curved reflective mirror to achieve a wide FOV and high-resolution picture while maintaining transparency for an AR environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a curved combiner with extreme shape is used to provide collimated image light for large field of view, then the field of view is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the optical path into multiple segments: display, collamer lens, first prism, second prism, and combiner. Each component performs a specific optical function, allowing the system to achieve wide field of view through coordinated optical elements rather than relying on a single extreme-shaped component.
Solution Approach 2:
The patent introduces intermediate optical elements (collamer lens, prisms) between the display and the combiner to progressively expand and redirect the light path. These intermediaries facilitate the transformation from a small display area to a wide field of view without requiring the combiner alone to handle the entire optical challenge.
2Ease of operation
If image light rays are directed to steer clear of hitting the side of the face, then the comfort and usability are improved, but the device volume and temple space requirements increase
Solution Approach 1:
The patent uses prisms to redirect light rays in three-dimensional space, changing the optical path from a simple linear progression to a multi-dimensional trajectory. This allows light to be directed around the user's face in a compact configuration, avoiding direct incidence on the face while maintaining a compact overall device volume.
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 system provides a significantly wider field of view and higher resolution, enhancing the AR experience while maintaining a lightweight and compact design, allowing users to seamlessly interact with both virtual and real-world elements.
Implementation Method 1
a collamer lens to capture the light from the display and redirect it through the optical assembly
Implementation Method 2
The light passes through prims 120 and into prism 130, followed by prism 140, prism 150 and finally to prism 160
Implementation Method 3
The bottom surface 163 of the optical glass layer 160 is curved... The light energy that hits the surface 163 is directed back through the prisms
Implementation Method 4
The second optical glass layer 130 is illustrated as including the micro-mirror strip 131 on the top surface 132
Data Source
AI summary
A multilayered optical prism assembly with a sub-array of micro-mirror strips between each layer such that light passing through the assembly has an increased path length to facilitate focusing and a curved reflector increases the field of view with the light being presented through an array of pinhole micro-mirrors consisting of a combination of the sub-arrays.